Upsilon Aurigae
Location of υ Aurigae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 51m 02.437s[2] |
| Declination | +37° 18′ 20.05″[2] |
| Apparent magnitude (V) | 4.74[3] |
| Characteristics | |
| Evolutionary stage | Asymptotic giant branch[4] |
| Spectral type | M0 III[5] |
| U−B color index | +1.93[3] |
| B−V color index | +1.62[3] |
| R−I color index | 1.07[citation needed] |
| Variable type | Suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | +37.62±0.34[7] km/s |
| Proper motion (μ) | RA: +36.426 mas/yr[2] Dec.: −45.606 mas/yr[2] |
| Parallax (π) | 5.7358±0.2055 mas[2] |
| Distance | 570 ± 20 ly (174 ± 6 pc) |
| Absolute magnitude (MV) | −1.28[1] |
| Details[8] | |
| Mass | 1.64±0.22 M☉ |
| Radius | 74.2+8.7 −7.0 R☉ |
| Luminosity | 1,165±250 L☉ |
| Surface gravity (log g) | 1.16+0.04 −0.08[9] cgs |
| Temperature | 3,912±52 K |
| Age | 1.98±0.68 Gyr |
| Other designations | |
| υ Aur, 31 Aurigae, NSV 2661, BD+37 1336, FK5 2440, GC 7322, HD 38944, HIP 27639, HR 2011, SAO 58496, PPM 70915[10] | |
| Database references | |
| SIMBAD | data |
Upsilon Aurigae is a single[11] star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinised from υ Aurigae, and abbreviated Upsilon Aur or υ Aur. This star has an apparent visual magnitude of 4.74,[3] which means it is bright enough to be seen with the naked eye. Based upon parallax measurements, this star is approximately 570 light-years (170 parsecs) distant from the Earth. It is drifting further away with a radial velocity of +37 km/s.[7]
This is an evolved red giant star with a stellar classification of M0 III.[5] It is a suspected variable star[6] and is currently on the asymptotic giant branch, which means it is generating energy through the fusion of helium along a shell surrounding a small, inert core of carbon and oxygen.[4] The star is two billion years old with 1.64 times the mass of the Sun and has expanded to 61 times the Sun's radius. It is radiating 1,165 times the Sun's luminosity from its photosphere at an effective temperature of 3,912 K.[8]
References
[edit | edit source]- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). XHIP record for this object at VizieR.
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b c d 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).
- ^ 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).
- ^ 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).
