HD 224693
Encyclopedia
HD 224693 is a yellow subgiant
star
approximately 320 light-year
s away in the constellation
Cetus
.
was discovered orbiting HD 224693 by the Keck telescope using radial velocity
measurements. A preliminary search for transits
using photometric
data from Fairborn Observatory was inconclusive because data around the predicted time of transit was to sparse to rule out possible transits.
Subgiant star
A subgiant star is a star that is slightly brighter than a normal main-sequence star of the same spectral class, but not as bright as true giant stars...
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...
approximately 320 light-year
Light-year
A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...
s away 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....
Cetus
Cetus
Cetus is a constellation. Its name refers to Cetus, a sea monster in Greek mythology, although it is often called 'the whale' today. Cetus is located in the region of the sky that contains other water-related constellations such as Aquarius, Pisces, and Eridanus.-Ecliptic:Although Cetus is not...
.
Planetary system
In 2006, an extrasolar planetExtrasolar 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...
was discovered orbiting HD 224693 by the Keck telescope using radial velocity
Doppler spectroscopy
Doppler spectroscopy, also known as radial velocity measurement, is a spectroscopic method for finding extrasolar planets. It involves the observation of Doppler shifts in the spectrum of the star around which the planet orbits....
measurements. A preliminary search for transits
Astronomical transit
The term transit or astronomical transit has three meanings in astronomy:* A transit is the astronomical event that occurs when one celestial body appears to move across the face of another celestial body, hiding a small part of it, as seen by an observer at some particular vantage point...
using photometric
Photometry (astronomy)
Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation...
data from Fairborn Observatory was inconclusive because data around the predicted time of transit was to sparse to rule out possible transits.
See also
- 79 Ceti79 Ceti79 Ceti is a yellow subgiant star approximately 127 light-years away in the constellation Cetus. It has stopped hydrogen fusion in its core, this implies an age much higher than our Sun's 4.5 billion years. Eventually the outer layers of the star will expand and cool and the star will become a...
- HD 222582HD 222582|- style="background-color: #A0B0FF;" colspan="3"| Planet|- bgcolor="#FFFAFA"| HD 222582 b || |- bgcolor="#FFFAFA"| || HD 222582 is a magnitude 7.7 star approximately 137 light-years away in the constellation of Aquarius...
- HD 33283HD 33283HD 33283 is an 8th magnitude star in the constellation Lepus. It is located 86.88 parsecs away from the solar system. HD 33283 is similar to our Sun in terms of spectral type [G4V]. However, the star dwarfs the Sun by 24% more massive, 20% larger, 217 K hotter, and 232% more metals...
- HD 86081HD 86081HD 86081 is a yellow-white dwarf star in the constellation Sextans south of the celestial equator. It is bigger and more massive at 1.22 and 1.21 solar units respectively. It has temperature of 6028 K and luminosity of 1.75 solar....
- List of extrasolar planets