Eta Octantis
Location of η Octantis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Octans |
| Right ascension | 10h 59m 13.7578s[1] |
| Declination | −84° 35′ 38.018″[1] |
| Apparent magnitude (V) | 6.18±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A1 Va[4] |
| U−B color index | +0.12[5] |
| B−V color index | +0.11[5] |
| Astrometry | |
| Radial velocity (Rv) | −1.7±0.6[6] km/s |
| Proper motion (μ) | RA: −65.747 mas/yr[1] Dec.: −8.273 mas/yr[1] |
| Parallax (π) | 9.1133±0.02 mas[1] |
| Distance | 357.9 ± 0.8 ly (109.7 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.08[7] |
| Details | |
| Mass | 2.37±0.03[3] M☉ |
| Radius | 2.6±0.1[8] R☉ |
| Luminosity | 45.3+3.1 −3.0[3] L☉ |
| Surface gravity (log g) | 4.1[9] cgs |
| Temperature | 9,500[9] K |
| Metallicity [Fe/H] | −0.01[10] dex |
| Rotational velocity (v sin i) | 152±13[11] km/s |
| Age | 547[10] Myr |
| Other designations | |
| η Oct, 11 G. Octantis[12], CPD−83°386, FK5 1664, GC 15164, HD 96124, HIP 53702, HR 4312, SAO 258600[13] | |
| Database references | |
| SIMBAD | data |
Eta Octantis, Latinized from η Octantis, is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.19,[2] making it faintly visible to the naked eye. The object is situated at a distance of 358 light years[1] but is approaching the Solar System with a heliocentric radial velocity of −1.7 km/s.[6]
Eta Octantis has a stellar classification of A1 Va,[4] indicating that it is an ordinary A-type main sequence star. At present it has 2.37 times the Sun's mass[3] and 2.6 times the Sun's radius.[8] It shines with a luminosity of 45 L☉[3] from its photosphere at an effective temperature of 9,500 K, giving a white hue.[9] Eta Octantis is a rapidly rotating star, with a projected rotational velocity of 152 km/s,[11] and is estimated to be 547 million years old,[10] having completed 72% of its main sequence lifetime.[3]
References
[edit | edit source]- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). (Erratum: Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).). Gaia EDR3 record for this source at VizieR.
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
