NGC 1533
Encyclopedia
NGC 1533 is a barred lenticular galaxy
with faint spiral structure in the constellation
Dorado
and the seventh brightest member of the Dorado Group
and 1° off the group's center. It is surrounded by a vast arc or ring of H I
which is connected to IC 2038 and IC 2039. The ring orbits around 32 kpc from the center. It is typical of lenticular galaxies in that star formation
is weak in NGC 1533. Using both the surface brightness fluctuation
(SBF) and globular cluster luminosity function (GCLF) methods, its distance was estimated in 2007 to be 19.4 ± 1.1 Mpc and 18.6 ± 2.0 Mpc respectively. Averaging these together gives a distance of around 19 million parsecs or 62 million light-years from earth. In 1970, a supernova was detected in NGC 1533.
NGC 1533 was discovered by John Herschel
on December 5, 1834.
Barred lenticular galaxy
A barred lenticular galaxy is a lenticular version of a barred spiral galaxy. They have the Hubble type of SB0....
with faint spiral structure 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....
Dorado
Dorado
Dorado is a constellation in the southern sky. It was created in the late 16th century and is now one of the 88 modern constellations. Its name refers to the dolphinfish , which is known as dorado in Spanish, although it has also been depicted as a swordfish...
and the seventh brightest member of the Dorado Group
Dorado Group
The Dorado Group is a loose concentration of galaxies containing both spirals and ellipticals. It is generally considered a 'galaxy group' but may approach the size of a 'galaxy cluster'. It lies primarily in the southern constellation Dorado and is one of the richest galaxy groups of the Southern...
and 1° off the group's center. It is surrounded by a vast arc or ring of H I
H I region
An H I region is an interstellar cloud composed of neutral atomic hydrogen , in addition to the local abundance of helium and other elements. These regions are non-luminous, save for emission of the 21-cm region spectral line. This line has a very low transition probability, so requires large...
which is connected to IC 2038 and IC 2039. The ring orbits around 32 kpc from the center. It is typical of lenticular galaxies in that star formation
Star formation
Star formation is the process by which dense parts of molecular clouds collapse into a ball of plasma to form a star. As a branch of astronomy star formation includes the study of the interstellar medium and giant molecular clouds as precursors to the star formation process and the study of young...
is weak in NGC 1533. Using both the surface brightness fluctuation
Surface brightness fluctuation
Surface brightness fluctuation is a secondary distance indicator used to estimate distances to galaxies. The technique uses the fact that galaxies are made up of a finite number of stars. The number of stars in any small patch of the galaxy will vary from point to point, creating a noise-like...
(SBF) and globular cluster luminosity function (GCLF) methods, its distance was estimated in 2007 to be 19.4 ± 1.1 Mpc and 18.6 ± 2.0 Mpc respectively. Averaging these together gives a distance of around 19 million parsecs or 62 million light-years from earth. In 1970, a supernova was detected in NGC 1533.
NGC 1533 was discovered by John Herschel
John Herschel
Sir John Frederick William Herschel, 1st Baronet KH, FRS ,was an English mathematician, astronomer, chemist, and experimental photographer/inventor, who in some years also did valuable botanical work...
on December 5, 1834.