Psi2 Aurigae
- For other star systems with this Bayer designation, see Psi Aurigae.
 The location of ψ2 Aurigae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 06h 39m 19.82634s[1] |
| Declination | +42° 29′ 19.9617″[1] |
| Apparent magnitude (V) | 4.79[2] |
| Characteristics | |
| Spectral type | K3 III[3] or K3 Iab:[4] |
| U−B color index | +1.30[2] |
| B−V color index | +1.23[2] |
| R−I color index | 0.6 |
| Astrometry | |
| Radial velocity (Rv) | 16.09 ± 0.19[5] km/s |
| Proper motion (μ) | RA: -0.87[1] mas/yr Dec.: -54.97[1] mas/yr |
| Parallax (π) | 7.84 ± 0.29[1] mas |
| Distance | 420 ± 20 ly (128 ± 5 pc) |
| Details | |
| Radius | 27[6] R☉ |
| Surface gravity (log g) | 2.30[7] cgs |
| Temperature | 4,410[7] K |
| Metallicity [Fe/H] | –0.10[7] dex |
| Rotational velocity (v sin i) | 1.0[8] km/s |
| Other designations | |
Psi2 Aurigae (ψ2 Aur, ψ2 Aurigae) is a star in the constellation Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.79.[2] Based upon parallax measurements, this star is approximately 420 light-years (130 parsecs) away from the Earth. At that distance, the brightness of the star is diminished by 0.07 in magnitude from extinction caused by interstellar gas and dust.[5]
Most studies categorized this as a K-type giant star with a stellar classification of K3 III.[3] However, the results of a study published in 2003 list it with a classification of K3 Iab:, which would instead suggest it is a supergiant star.[4][9] The measured angular diameter of this star, after correction for limb darkening, is 1.97 ± 0.02 mas.[10] At the estimated distance of this star,[1] this yields a physical size of about 27 times the radius of the Sun.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found. Note: see VizieR catalogue I/311.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.. The radius (R*) is given by:
- ↑ 7.0 7.1 7.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
