Eta2 Pictoris
Star in the constellation Pictor / From Wikipedia, the free encyclopedia
η2 Pictoris, Latinised as Eta2 Pictoris, is a solitary[8] star in the southern constellation of Pictor. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.02.[2] With an annual parallax shift of 7.8 mas as seen from the Earth,[1] it is located around 418 light years from the Sun. It is a member of the HR 1614 moving group of stars that share a common motion through space.[6]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Pictor |
Right ascension | 05h 04m 58.01433s[1] |
Declination | −49° 34′ 40.2034″[1] |
Apparent magnitude (V) | 5.02[2] |
Characteristics | |
Spectral type | K5 III[3] |
U−B color index | +1.82[2] |
B−V color index | +1.51[2] |
Variable type | suspected[4] |
Astrometry | |
Radial velocity (Rv) | −5.0±7.4[5] km/s |
Proper motion (μ) | RA: +68.538[1] mas/yr Dec.: −2.186[1] mas/yr |
Parallax (π) | 7.8033 ± 0.1351 mas[1] |
Distance | 418 ± 7 ly (128 ± 2 pc) |
Absolute magnitude (MV) | −1.2[6] |
Details | |
Radius | 40.56+0.59 −2.38[1] R☉ |
Luminosity | 362.6±7.4[1] L☉ |
Temperature | 3,955+121 −28[1] K |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K5 III,[3] having exhausted the supply of hydrogen at its core, then cooled and expanded off the main sequence. At present it has 41[1] times the girth of the Sun. It is radiating an estimated 363.5 times the Sun's luminosity from its photosphere at an effective temperature of 4,136 K.[9] This is a member of the old disk population and is a suspected variable star.[10]