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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 06h50m 45.94330s[1] |
| Declination | +41° 46′ 52.4267″[1] |
| Apparent magnitude (V) | 5.02[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| U−B color index | +1.35[2] |
| B−V color index | +1.27[2] |
| R−I color index | 0.46 |
| Astrometry | |
| Radial velocity (Rv) | +59.53 ± 0.25[4] km/s |
| Proper motion (μ) | RA: –25.660[5] mas/yr Dec.: –138.163[5] mas/yr |
| Parallax (π) | 9.8872 ± 0.1499 mas[5] |
| Distance | 330 ± 5 ly (101 ± 2 pc) |
| Absolute magnitude (MV) | −0.33[6] |
| Details | |
| Radius | 24[7] R☉ |
| Luminosity | 217[6] L☉ |
| Surface gravity (log g) | 2.35[8] cgs |
| Temperature | 4,300[8] K |
| Metallicity [Fe/H] | 0.00[8] dex |
| Rotational velocity (v sin i) | 10[9] km/s |
| Other designations | |
ψ7 Aur, 58 Aurigae, BD+41 1536, FK5 2527, HD 49520, HIP 32844, HR 2516, SAO 41380.[10] | |
| Database references | |
| SIMBAD | data |
Psi7 Aurigae, Latinized from ψ7 Aurigae, is a star in the northern constellationofAuriga. It is a dim, naked eye star with an apparent visual magnitude of 5.02. Based upon Gaia Data Release 2 parallax values, it is approximately 330 light-years (100 parsecs) from Earth.
ψ7 Aurigae is a giant star with a stellar classification of K3 III.[3] The measured angular diameter of this star, after correction for limb darkening, is 1.96 ± 0.04 mas.[11] At its estimated distance,[1] this yields a physical size of about 24 times the radius of the Sun.[7] The outer envelope has an effective temperature of 4,300,[8] giving it an orange colour and a classification as a K-type star.[12] Although cooler than the sun, its larger size means that it is more luminous, emitting in total 217 times as much electromagnetic radiation.
It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).
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