List of stars in Hydra
Encyclopedia
This is the list of notable star
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...

s in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....

 Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...

, sorted by decreasing brightness.
Name B
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...

F
Flamsteed designation
Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. Each star is assigned a number and the Latin genitive of the constellation it lies in...

G.
Gould designation
Gould designations for stars are similar to Flamsteed designations in the way that they number stars within a constellation in increasing order of right ascension. Each star is assigned an integer , followed by " G. " , and then the Latin genitive of the constellation it lies in...

HD
Henry Draper Catalogue
The Henry Draper Catalogue is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension , published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the...

HIP RA
Right ascension
Right ascension is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.-Explanation:...

Dec
Declination
In astronomy, declination is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is comparable to geographic latitude, but projected onto the celestial sphere. Declination is measured in degrees north and...

vis.
mag.
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...

abs.
mag.
Absolute magnitude
Absolute magnitude is the measure of a celestial object's intrinsic brightness. it is also the apparent magnitude a star would have if it were 32.6 light years away from Earth...

Dist. (ly) Sp. class
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...

Notes
Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...

 
α 30 140 81797 46390 1.99 −1.69 177 K3III Alfard, Kalbelaphard, Cor Hydrae, Soheil al Fard, Soheil Solitarius
γ Hya
Gamma Hydrae
Gamma Hydrae is a Class G8, third-magnitude star in the constellation Hydra. Gamma Hydrae is a yellow giant, located about 130 light-years from Earth.-Modern legacy:γ Hya appears on the flag of Brazil, symbolising the state of Acre....

 
γ 46 345 115659 64962 2.99 −0.05 132 G8III
ζ Hya
Zeta Hydrae
Zeta Hydrae is a Class G9, third-magnitude star in the constellation Hydra. Zeta Hydrae is a yellow giant star located about 150 light-years from Earth.-Name and etymology:...

 
ζ 16 77 76294 43813 3.11 −0.21 151 G8III-IV
ν Hya
Nu Hydrae
Nu Hydrae is a Class K2, third-magnitude star in the constellation Hydra. Nu Hydrae is an orange giant star located about 140 light-years from Earth....

 
ν 254 93813 52943 3.11 −0.03 138 K0/K1III
π Hya
Pi Hydrae
Pi Hydrae is a Class K2, third-magnitude star in the constellation Hydra. Pi Hydrae is an orange giant star located about 100 light-years from Earth....

 
π 49 368 123123 68895 3.25 0.79 101 K2III
ε Hya
Epsilon Hydrae
Epsilon Hydrae is a Class G5, third-magnitude star in the constellation Hydra. Epsilon Hydrae is a binary star with components of magnitudes 3.3 and 6.8, separated by 2.7 arcseconds...

 
ε 11 59 74874 43109 3.38 0.29 135 G0III-IV BY Draconis variable
BY Draconis variable
BY Draconis variables are main sequence variable stars of late spectral types, usually K or M. The name comes from the archetype for this category of variable star system, BY Draconis. They exhibit variations in their luminosity due to rotation of the star coupled with star spots, and other...

ξ Hya
Xi Hydrae
Xi Hydrae is a third-magnitude star in the constellation Hydra. The star is situated 130 light-years from Earth, and has a radius about 10 times that of the Sun, and a luminosity nearly 60 times as large...

 
ξ 288 100407 56343 3.54 0.55 129 G8III
λ Hya  λ 41 201 88284 49841 3.61 0.88 115 K0III
μ Hya  μ 42 221 90432 51069 3.83 −0.58 248 K4III
θ Hya  θ 22 108 79469 45336 3.89 0.91 129 B9.5V
ι Hya  ι 35 170 83618 47431 3.90 −0.74 276 K3IIIvar Ukdah
HD 71155  c 19 71155 41307 3.91 0.99 125 A0V
υ1 Hya
Upsilon1 Hydrae
Upsilon1 Hydrae is a yellow giant star in the constellation of Hydra. The star is one of Okayama Planet Search's main target for planet search and has turned out to host a substellar companion.-Substellar companion:...

 
υ1 39 178 85444 48356 4.11 −0.51 273 G6/G8III has a brown dwarf
Brown dwarf
Brown dwarfs are sub-stellar objects which are too low in mass to sustain hydrogen-1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no chemical differentiation by depth...

 companion
δ Hya
Delta Hydrae
Delta Hydrae is a Class A1, fourth-magnitude star in the constellation Hydra. Delta Hydrae is a binary double star, located about 180 light-years from Earth.-Name and etymology:...

 
δ 4 36 73262 42313 4.14 0.44 179 A1Vnn Lisan al Shudja, Lingua Hydri
β Hya
Beta Hydrae
Beta Hydrae is a double star in the constellation of Hydra. Its overall apparent visual magnitude varies by 0.04 magnitudes with a period of 2.344 days, and is approximately 4.27 at maximum brightness. The brighter star in the double is a giant Bp star which has been classified as an...

 
β 301 103192 57936 4.29 −0.96 365 Ap Si α2 CVn variable
η Hya  η 7 49 74280 42799 4.30 −1.48 466 B3V... β Cep variable
Beta Cephei variable
Beta Cephei variables are variable stars which exhibit variations in their brightness due to pulsations of the stars' surfaces. The point of maximum brightness roughly corresponds to the maximum contraction of the star. Typically, Beta Cephei variables change in brightness by 0.01 to 0.3...

12 Hya  D 12 60 74918 43067 4.32 0.11 227 G8III
ρ Hya  ρ 13 64 75137 43234 4.35 −0.72 337 A0Vn
58 Hya  E 58 387 130694 72571 4.42 −0.44 305 K3III
σ Hya
Sigma Hydrae
Sigma Hydrae is the 4th-magnitude star in the constellation Hydra. Sigma Hydrae belongs to spectral class K1+III and has apparent magnitude +4.44...

 
σ 5 42 73471 42402 4.45 −0.72 352 K2III Minhar al Shija, Al Minliar al Shuja, Minchir
τ2 Hya
Tau Hydrae
The Bayer designation Tau Hydrae is shared by two star systems, τ¹ Hydrae and τ² Hydrae, in the constellation Hydra...

 
τ2 32 152 82446 46776 4.54 −1.20 459 A3V Ukdah
τ1 Hya
Tau Hydrae
The Bayer designation Tau Hydrae is shared by two star systems, τ¹ Hydrae and τ² Hydrae, in the constellation Hydra...

 
τ1 31 145 81997 46509 4.59 3.43 56 F6V Ukdah
υ2 Hya  υ2 40 194 87504 49402 4.60 −0.05 277 B8V
HD 74395  F 51 74395 42835 4.63 −1.71 604 G2Ib
2 Sex  2 168 83425 47310 4.68 0.06 274 K3III
ο Hya  ο 293 101431 56922 4.70 −1.21 495 B9V
141 G. Hya  G 141 81799 46371 4.72 1.06 176 K1III
174 G. Hya  I 174 83953 47522 4.76 −1.16 497 B5V
26 Hya  26 122 80499 45751 4.77 −0.19 320 G8III
51 Hya  k 51 375 125932 70306 4.78 1.14 175 K3III
27 Hya
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...

 
P 27 124 80586 45811 4.80 0.43 243 G8III-IV+... unconfirmed planet
Planet
A planet is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, science,...

?
9 Hya  9 47 74137 42662 4.87 0.89 204 K0IIICN...
181 G. Hya  181 85859 48559 4.87 −0.19 336 K2III
241 G. Hya  241 92036 51979 4.87 −0.97 479 M1III
U Hya  240 92055 52009 4.89 −1.16 528 C 240 G. Hya. Carbon star
Carbon star
A carbon star is a late-type star similar to a red giant whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds,...

φ Hya  φ, φ3 242 92214 52085 4.91 0.72 225 G8III 242 G. Hya
χ1 Hya  χ1 264 96202 54204 4.92 1.73 142 F3IV/V
175 G. Hya  175 84117 47592 4.93 4.07 49 G0V nearby
17 Crt  17 284 100286 56280 4.93 2.80 87 F8V
183 G. Hya  183 85951 48615 4.94 −1.74 706 K5III
ψ Hya  ψ 45 341 114149 64166 4.94 0.69 231 K0III
l Hya  l 52 379 126769 70753 4.97 −0.56 415 B7/B8V
6 Hya  a 6 44 73840 42509 4.98 −0.57 419 K3III
ω Hya  ω 18 95 77996 44659 4.99 −2.86 1212 K2II-III
160 G. Hya  160 82734 46880 5.02 −0.03 334 K0III
κ Hya  κ 38 173 83754 47452 5.07 −0.92 515 B4IV/V Al Sharāsīf
50 Hya  50 370 124206 69415 5.07 0.83 229 K2III
44 Hya  44 230 91550 51718 5.08 −1.36 633 K5III
II Hya (298 G. Hya) 298 102620 57613 5.10 −0.72 477 M4III
287 G. Hya  287 100393 56332 5.13 −0.58 453 M1/M2III
54 Hya  m 54 382 129926 72197 5.15 2.73 99 F0V + G/K
295 G. Hya  295 101666 57047 5.20 −0.40 430 K5III
47 Hya  47 365 121847 68269 5.20 0.11 339 B8V
257 G. Hya  b3 257 94388 53252 5.23 2.75 102 F6V
56 Hya  56 385 130259 72357 5.23 0.19 331 G8/K0III
23 Hya  23 112 79910 45527 5.24 0.58 279 K2III
303 G. Hya  303 103462 58082 5.26 0.48 295 G8III
61 G. Hya  61 74988 43142 5.28 0.19 339 A3V
14 Hya  14 67 75333 43305 5.30 −0.34 438 B9MNp... KX Hya; α2 CVn variable
200 G. Hya  200 88215 49809 5.30 3.12 89 F2/F3IV/V
1 G. Hya  1 68312 40107 5.36 0.43 316 G8III
142 G. Hya  142 81809 46404 5.38 2.91 102 G2V
328 G. Hya  328 109799 61621 5.41 2.72 113 F0V
271 G. Hya  271 96819 54477 5.43 1.61 189 A1V
249 G. Hya  b1 249 93397 52737 5.44 1.30 219 A3V
330 G. Hya  330 110666 62131 5.46 0.03 397 K3III
20 Hya  20 103 78732 44961 5.47 −1.00 642 G8II
367 G. Hya
HD 122430
HD 122430 is an orange giant star about 440 light years away in the constellation of Hydra on the celestial sphere. The star has completely run out of the hydrogen fuel that keeps it stable, although its age is only 3.1 billion years old, younger than the Sun’s 4.6 billion years. HD 122430 has a...

 
367 122430 68581 5.47 −0.15 434 K2/K3III has a planet
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...

 (b
HD 122430 b
HD 122430 b is a giant planet orbiting around the giant star HD 122430. It has a mass at least 3.71 times that of Jupiter. This planet located at a distance of 1.02 astronomical units away from its star, which is very similar to the Earth’s distance from the Sun. Despite of this, the higher...

)
24 Hya  24 114 79931 45526 5.49 −1.14 689 B9III
15 Hya  15 70 75737 43496 5.55 −0.33 488 A4m
33 Hya  A 33 163 82870 46982 5.56 −1.04 681 K1III Ukdah
323 G. Hya  323 108323 60735 5.56 −0.42 511 B9V
224 G. Hya  224 90957 51364 5.58 0.21 387 K3III
195 G. Hya  195 87808 49569 5.59 0.48 343 K4III
225 G. Hya  225 91120 51491 5.59 −0.28 487 B8/B9IV/V
2 Hya  2 23 71297 41375 5.60 1.97 173 A5III-IV LM Hya; δ Sct variable
Delta Scuti variable
A Delta Scuti variable is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface. Typical brightness fluctuations are from 0.003 to 0.9 magnitudes in V over a period of a few hours, although the amplitude and period of the...

19 Hya  19 99 78556 44883 5.60 −1.60 898 B9.5III
28 Hya  28 134 81420 46221 5.60 −0.98 675 K5III
1 Hya  1 15 70958 41211 5.61 3.44 89 F3V
55 Hya  55 384 130158 72323 5.61 −0.76 613 B9IV/V
92 G. Hya  92 77353 44356 5.64 −0.73 613 K0III
333 G. Hya  333 111295 62500 5.65 0.80 304 G8III
59 Hya  59 392 132219 73284 5.65 0.50 350 A6IV
148 G. Hya  148 82077 46511 5.66 −1.58 913 K4/K5III
χ2 Hya  χ2 265 96314 54255 5.69 −1.26 799 B8V 265 G. Hya.; β Lyr variable
Beta Lyrae variable
Beta Lyrae variables are a class of close binary stars. Their total brightness is variable because the two component stars orbit each other, and in this orbit one component periodically passes in front of the other one, thereby blocking its light. The two component stars of Beta Lyrae systems are...

350 G. Hya  350 117716 66065 5.69 1.61 214 A0/A1V
56 G. Hya  56 74794 43026 5.70 1.04 278 K0III:
193 G. Hya  193 87427 49339 5.70 1.23 255 F0V
259 G. Hya  259 95221 53699 5.70 2.27 159 F2V
236 G. Hya  236 91889 51933 5.71 3.76 80 F7V
291 G. Hya  291 100893 56620 5.71 0.54 352 K0III
3 Hya  3 35 72968 42146 5.72 1.14 268 A1spe... HV Hya; α2 CVn variable
107 G. Hya  107 79181 45158 5.72 0.90 300 G8III
102 G. Hya  102 78702 44923 5.73 1.22 260 A0/A1V
351 G. Hya  351 118349 66400 5.73 0.36 386 A7V+...
17 G. Hya  17 71095 41299 5.74 −0.59 601 K5III
156 G. Hya  156 82573 46813 5.74 0.58 351 A4III
80 G. Hya  80 76376 43798 5.75 0.17 425 K2/K3III
101 G. Hya  101 78668 44936 5.76 0.01 460 G6III
57 Hya  57 386 130274 72378 5.76 0.14 434 B9.5V
48 Hya  48 366 122066 68390 5.77 1.98 187 F6V
121 G. Hya  121 80479 45743 5.79 0.34 400 K1/K2III
272 G. Hya  272 97023 54561 5.79 0.69 342 A1V
33 G. Hya  33 72660 42028 5.80 0.80 326 A1V
88 G. Hya  88 76932 44075 5.80 4.16 70 F7/F8IV/V
354 G. Hya  354 118646 66563 5.81 2.36 160 F3V
357 G. Hya  357 119752 67143 5.81 1.08 287 A0V
118 G. Hya  118 80050 45559 5.83 0.44 389 K0III
60 Hya  60 393 132851 73566 5.83 0.84 325 A4IV
300 G. Hya  300 103026 57841 5.85 3.36 102 F8V
150 G. Hya  150 82232 46618 5.86 1.45 249 K2III
329 G. Hya  329 109960 61720 5.86 −0.26 547 K2/K3III
252 G. Hya  252 93657 52841 5.87 0.29 426 A1V
374 G. Hya  374 125276 69965 5.87 4.62 58 F7Vw
32 G. Hya
32 G. Hydrae
32 G. Hydra is a G-type giant in the constellation Hydra....

 
32 72561 42008 5.89 −5.22 5433 G5III
14 G. Hya  14 70652 41080 5.92 −1.11 832 M1III
162 G. Hya  162 82747 46897 5.92 1.12 297 B9.5V
304 G. Hya  304 103596 58158 5.93 0.11 477 K4III
84 G. Hya  84 76579 43899 5.95 −0.82 738 K3III
158 G. Hya  158 82660 46859 5.95 −1.06 823 K4III
289 G. Hya
HR 4458
HR 4458 is a binary star system in the constellation Hydra. At a distance of 31 light years, they are the closest stars to the solar system within this constellation. The pair has an angular separation of 16.2″....

 
289 100623 56452 5.96 6.06 31 K0V
27 G. Hya  27 71766 41597 6.01 −1.39 985 F2III
75 G. Hya  75 76151 43726 6.01 4.85 56 G3V
136 G. Hya  136 81567 46288 6.01 −1.14 876 K3III
209 G. Hya  209 89455 50536 6.01 1.89 217 A8III
φ2 Hya  φ2 234 91880 51905 6.01 −1.35 967 M1III
16 G. Hya  16 70937 41214 6.03 1.98 211 F2V
6 G. Hya  6 70013 40818 6.04 −0.21 579 G8III
227 G. Hya  227 91280 51551 6.04 2.90 138 F6/F7V
243 G. Hya  243 92245 52113 6.04 0.83 359 A0Vn
361 G. Hya  361 121156 67890 6.05 2.04 206 K2III
260 G. Hya  260 95456 53818 6.06 3.59 102 F8V
90 G. Hya  90 77250 44315 6.08 −0.84 789 F3IV+...
179 G. Hya  179 85519 48396 6.08 0.66 395 K0III
65 G. Hya  65 75140 43204 6.09 −0.46 667 K0
322 G. Hya  322 108110 60603 6.09 −0.38 643 K3III
21 Hya  21 106 79193 45184 6.10 1.51 269 A3m KW Hya; Algol variable
Algol variable
Algol variables or Algol-type binaries are a class of eclipsing binary stars where the orbital plane of the stars are coincident with the line of sight from Earth. When the cooler component passes in front of the hotter one, part of the latter's light is blocked, and the total brightness of the...

231 G. Hya  231 91706 51795 6.10 2.09 207 F6V
372 G. Hya  372 124576 69623 6.10 −0.54 695 A1V
155 G. Hya  155 82543 46840 6.11 0.58 416 F7IV-V
OY Hya (188 G. Hya) 188 86612 48943 6.11 −0.31 628 B5V Be star
Be star
A Be star is a B-type star with prominent emission lines of hydrogen in its spectrum. The designation is combined by the spectral class, B, and the lowercase e denoting emission in the spectral classification system. Line emission from other atomic ions might be present as well, but is typically...

9 G. Hya  9 70148 40859 6.12 0.12 516 K2III
73 G. Hya  73 75916 43580 6.12 1.04 338 K1III
154 G. Hya  154 82477 46768 6.12 0.92 358 K0
157 G. Hya  157 82638 46869 6.12 0.72 393 K0
217 G. Hya  217 89911 50790 6.12 −0.55 704 A0V
10 Hya  10 52 74591 42931 6.13 2.12 207 A6V
81 G. Hya  81 76494 43902 6.13 −1.34 1016 G8II-III
153 G. Hya  153 82428 46744 6.13 2.46 177 F0Vn
13 G. Hya  13 70574 41036 6.14 2.07 212 A8IV
105 G. Hya  105 79108 45167 6.14 0.83 376 A0V
146 G. Hya  146 82043 46529 6.14 0.32 475 F0III
MO Hya (334 G. Hya) 334 111786 62788 6.14 2.24 196 A0III δ Sct variable
363 G. Hya  363 121699 68177 6.14 −0.17 596 K2/K3III
286 G. Hya  286 100307 56293 6.15 −0.59 728 M2III
NS Hya (96 G. Hya) 96 78196 44738 6.16 −1.25 991 M1III
315 G. Hya  315 105686 59307 6.16 1.14 329 A0V
302 G. Hya  302 103266 57971 6.17 1.78 246 A2V
8 G. Hya  8 70110 40858 6.18 3.13 133 F9V
37 G. Hya  37 73281 42299 6.18 0.79 391 K0
89 G. Hya  89 77084 44162 6.19 3.20 129 F5IV/V
359 G. Hya  359 120455 67523 6.19 0.97 361 A0V
LV Hya (305 G. Hya) 305 103789 58272 6.20 0.88 378 B9.5V α2 CVn variable
261 G. Hya  261 95698 53963 6.21 2.59 173 A9III/IV
356 G. Hya  356 119623 67071 6.21 −0.47 706 K3III
58 G. Hya  58 74860 43035 6.22 −4.13 3835 K5III
182 G. Hya  182 85905 48584 6.23 0.50 457 A2/A3III
205 G. Hya  205 88699 50066 6.23 0.74 409 A9m...
311 G. Hya  311 105078 59008 6.23 −0.51 728 B7V
371 G. Hya  371 124281 69458 6.23 −0.46 709 K0III
199 G. Hya  199 88182 49802 6.24 1.74 259 A5m
245 G. Hya  245 92770 52391 6.24 −0.53 738 K3/K4III:
147 G. Hya  147 82074 46543 6.25 2.57 177 G6IV
159 G. Hya  159 82674 46893 6.25 0.70 421 K0
197 G. Hya  197 88025 49689 6.25 0.01 578 A0V
149 G. Hya  149 82180 46569 6.26 −2.26 1646 K2/K3III
144 G. Hya  144 81980 46504 6.27 1.47 297 F0Vn
185 G. Hya  185 86266 48763 6.27 2.06 227 A4V
391 G. Hya  391 131919 73171 6.28 0.12 557 B8/B9V
235 G. Hya  235 91881 51885 6.29 3.07 143 F5V
126 G. Hya  126 80719 45854 6.30 2.88 158 F6V
192 G. Hya  192 87344 49321 6.30 0.47 477 B8V
HQ Hya (7 G. Hya) 7 69997 40766 6.31 1.14 353 F3IIIp δ Sct variable
37 Hya  37 171 83650 47427 6.31 −1.33 1098 A0Vn OW Hya; 171 G. Hya.
337 G. Hya  337 112519 63243 6.31 0.83 407 K0III
111 G. Hya  111 79752 45424 6.32 1.18 348 A0V
292 G. Hya  292 100953 56657 6.32 2.04 234 F5V
165 G. Hya  165 83104 47070 6.33 1.63 283 A0V
71 G. Hya  71 75811 43570 6.34 0.22 547 A5V
104 G. Hya  104 79066 45150 6.34 2.81 166 A9IVe...
V335 Hya (316 G. Hya) 316 106198 59588 6.34 −0.89 911 M4/M5Ib/II:
317 G. Hya  317 106257 59622 6.34 0.86 406 A0V
34 G. Hya  34 72908 42142 6.35 0.21 551 G9III
275 G. Hya  275 97393 54725 6.35 −0.23 676 M2/M3III
369 G. Hya  369 124162 69398 6.35 0.49 484 K2III
373 G. Hya  373 125279 69977 6.35 −0.69 834 K5III
206 G. Hya  206 88806 50142 6.36 −1.70 1336 M1III
50 G. Hya  50 74393 42854 6.37 −0.40 738 B9.5III-IV
172 G. Hya  172 83731 47454 6.37 −0.68 838 A2V
29 G. Hya  29 72462 41893 6.38 2.13 231 A7IV/V
320 G. Hya  320 107869 60468 6.39 −0.57 803 K5III
34 Hya  34 167 83373 47249 6.40 1.10 375 A1V
R Hya
R Hydrae
R Hydrae is a Mira-type variable star in the constellation Hydra.The magnitude of R Hydrae varies over a period of 389 days, between 3.21 and 11.00. The period of R Hydrae changes slowly....

 
347 117287 65835 6.40 −2.55 2012 M6/M7e Mira variable
Mira variable
Mira variables , named after the star Mira, are a class of pulsating variable stars characterized by very red colors, pulsation periods longer than 100 days, and light amplitudes greater than one magnitude in infrared and 2.5 magnitude in visual...

55 G. Hya  55 74688 42951 6.41 1.71 283 F2+...
LO Hya (25 G. Hya) 25 71663 41564 6.42 1.77 278 A5m
66 G. Hya  66 75217 43246 6.42 0.68 458 K0
308 G. Hya  308 104039 58436 6.42 −0.76 891 A1IV/V
364 G. Hya  364 121758 68224 6.42 0.17 579 K1III
26 G. Hya  26 71665 41547 6.43 −0.65 849 K0
74 G. Hya  74 76027 43623 6.43 0.89 417 K1III
274 G. Hya  274 97344 54703 6.43 0.84 427 K0III
332 G. Hya  332 111226 62448 6.43 −0.66 853 B8V
360 G. Hya  360 120690 67620 6.43 4.93 65 G5V
263 G. Hya  263 95857 54030 6.44 −0.38 753 M2/M3III
279 G. Hya  279 98221 55164 6.44 3.09 152 F3V
281 G. Hya  281 99712 55953 6.44 −1.50 1264 K4/K5III
294 G. Hya  294 101563 57001 6.44 3.35 135 G2III/IV
54 G. Hya  54 74685 42981 6.45 0.93 414 K0
117 G. Hya  117 79994 45543 6.45 1.19 368 K0
166 G. Hya  166 83352 47242 6.45 0.74 452 K0
204 G. Hya  204 88595 50013 6.45 3.33 137 F7V
258 G. Hya  258 94619 53387 6.45 0.00 637 K1III
349 G. Hya  349 117718 66060 6.45 3.08 154 F5IV
48 G. Hya  48 74190 42701 6.46 1.13 379 A5m
109 G. Hya  109 79481 45305 6.46 0.26 567 G6/G8III/IV
325 G. Hya  325 109074 61172 6.46 0.25 568 A3V
82 G. Hya  82 76478 43850 6.47 −0.51 813 K2III
213 G. Hya  213 89816 50728 6.47 1.18 373 A4IV/V
270 G. Hya  270 96723 54430 6.47 0.74 457 A1V
3 G. Hya  3 68667 40263 6.48 0.47 519 K0
63 G. Hya  63 75098 43152 6.48 −0.36 762 A2V
100 G. Hya  100 78614 44888 6.48 1.07 394 K0IIICN...
297 G. Hya  297 102438 57507 6.48 5.23 58 G5V
299 G. Hya  299 102888 57749 6.48 0.57 495 G8III
348 G. Hya  348 117558 65969 6.48 1.78 284 A1V
378 G. Hya  378 126400 70538 6.48 2.05 251 K0III
233 G. Hya  233 91790 51852 6.49 2.20 235 A5IV/V
312 G. Hya  312 105113 59021 6.49 2.94 167 G0V
342 G. Hya  342 114576 64375 6.49 1.23 367 A5V
346 G. Hya  346 117033 65682 6.49 −1.12 1087 K5III
210 G. Hya  210 89747 50693 6.50 2.68 189 F3IV
318 G. Hya  218 106500 59742 6.50 0.75 461 K0III
29 Hya  29 139 81728 46365 6.53 −1.48 1304 A2V
164 G. Hya
HD 82943
HD 82943 is a yellow dwarf star approximately 89 light-years away in the constellation of Hydra. Two extrasolar planets have been confirmed to be orbiting it, and it is thought that the system had more giant planets that were "swallowed" by the parent star...

 
164 82943 47007 6.54 4.35 90 G0V has two planets (b
HD 82943 b
HD 82943 b is an extrasolar planet approximately 89 light-years away in the constellation of Hydra. The planet was announced in 2000 by the Geneva Extrasolar Planet Search Team. The planet is the outermost planet of two....

 & c
HD 82943 c
HD 82943 c is an extrasolar planet approximately 89 light-years away in the constellation of Hydra. The planet was announced in 2001 to be orbiting the yellow dwarf star HD 82943. The planet is the innermost planet of two....

)
17 Hya  17 79 76370 43822 6.67 1.72 319 A3
HD 90156
HD 90156
HD 90156 is a 7th magnitude G-type main sequence star located approximately 129 light years away in the constellation Hydra. This star is smaller, cooler, fainter, and less massive than our Sun. Also its metal content is over half as much as the Sun. In 2009, a gas giant planet was found in orbit...

 
90156 50921 6.95 5.23 72 G5V has a planet (b
HD 90156 b
HD 90156 b is an extrasolar planet which orbits the G-type main sequence star HD 90156, located approximately 129 light years away in the constellation Hydra. This planet has at least 17.6 times the mass of Earth and takes over seven weeks to orbit the star at a semimajor axis of 0.264 AU...

); variable star
V Hya
V Hydrae
V Hydrae is a variable star in the constellation Hydra. It is considered by astronomers to be a carbon star. With a B-V colour index of +5.5 it is one of the reddest stars visible. It has a period of approximately 18 years and a sub-period of approximately 530 days....

 
47111 83085 7.0 C Carbon star
25 Hya  25 80105 45588 7.07 1.50 424 K0
HD 86264
HD 86264
HD 86264 is a 7th magnitude F-type main sequence star located approximately 237 light years away in the constellation Hydra. In August 2009, it was announced that an exoplanet was found in an eccentric orbit....

 
86264 48780 7.42 3.12 237 F7V has a planet (b
HD 86264 b
HD 86264 b is an extrasolar planet which orbits the F-type main sequence star HD 86264, located approximately 237 light years away in the constellation Hydra. This planet orbits in a very eccentric path around the star with a period of about four years. This planet can be as close as 0.86 AU to as...

)
HD 72659
HD 72659
HD 72659 is a yellow dwarf star in the Hydra constellation. The apparent magnitude is +7.48 and the distance is 168 light years away from Earth. An extrasolar planet was discovered orbiting this star in 2003....

 
72659 42030 7.48 3.93 168 G0 has a planet (b
HD 72659 b
HD 72659 b is a superjovian exoplanet massing at least 3.3 MJ orbiting at 4.77 AU from the star taking 3630 days to orbit. The orbital distance range from 3.49 AU to 6.05 AU with orbital eccentricity of 0.269....

)
HD 74156
HD 74156
HD 74156 is a yellow dwarf star in the constellation of Hydra, 211 light years from our solar system. It is known to be orbited by two giant planets.- Star :...

 
74156 42723 7.62 3.57 211 G0V has three planets (b
HD 74156 b
HD 74156 b is an extrasolar planet at least 1.88 times the mass of Jupiter that orbits the star HD 74156. It is most likely a gas giant. This planet was discovered in April 2001 by Dominique Naef and Michel Mayor along with the second planet HD 74156 c....

, c
HD 74156 c
HD 74156 c is an extrasolar planet at least eight times the mass of Jupiter orbiting the star HD 74156. It is most likely a gas giant. This planet was discovered by Dominique Naef and Michel Mayor in April 2001 together with the first planet HD 74156 b....

, & unconfirmed d)
φ1 Hya  φ1 43 91369 51614 7.62 3.25 244 G2V
HD 86226
HD 86226
HD 86226 is a G type yellowish white star found in the constellation of Hydra. Due to the reactions it had when placed under a Doppler test, 13 Magellan Doppler Velocity observations were made of an object found near the star...

 
86226 48739 7.93 4.79 139 G2V has a planet (b
HD 86226 b
This planet is a eccentric Jupiter gas giant discovered by the Magellan Planet Search Program in 2010....

)
HD 70573
HD 70573
HD 70573 is a 9th magnitude star approximately 149 light-years away in the constellation of Hydra. The star is young, only 101 million years old.-Planetary system:...

 
70573 8.70 5.40 149 G1-1.5V has a planet (b
HD 70573 b
HD 70573 b orbits the youngest RV host star HD 70573 approximately 149 light-years away in the constellation of Hydra. The discovery of the planet is important because it enables the study of debris disks around young stars in relation to presence of planets....

)
Gliese 433
Gliese 433
Gliese 433 is a dim red dwarf star in the constellation of Hydra, roughly 29.5 light years away from Sun. Astronomers have announced the discovery of a very low-mass extrasolar planet in close orbit.-Planetary system:...

 
56528 9.79 10.01 29 M1.5 has a planet (b)
TW Hya
TW Hydrae
TW Hydrae is an orange dwarf star approximately 176 light-years away in the constellation of Hydra . The star is the closest T Tauri star to the Solar System. TW Hydrae is similar in mass to the Sun, but is only about 5-10 million years old...

 
53911 11.1 7.3 184 K8Ve T Tauri star
T Tauri star
T Tauri stars are a class of variable stars named after their prototype – T Tauri. They are found near molecular clouds and identified by their optical variability and strong chromospheric lines.-Characteristics:...

, retracted planet
WASP-25  11.87 5.74 550 G4 has a transiting planet (b)
GJ 3634
GJ 3634
GJ 3634 is a red dwarf star in the Hydra constellation. One planet has been discovered in its orbit, GJ 3634 b. GJ 3634 is under half the mass and size of the Sun, and is estimated to be at least a billion years younger, and lies near to Earth, with a distance of 19.8 parsecs . It was targeted by...

 
19.8 65 M2.5 has a planet (b
GJ 3634 b
GJ 3634 b is a Super-Earth in the orbit of the nearby red dwarf GJ 3634. The planet is approximately eight times the mass of Earth, and orbits its star every two and a half days at a distance of .0287 AU...

)
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