HD 194612
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 20h 38m 18.6064s[1] |
| Declination | −81° 17′ 20.6261″[1] |
| Apparent magnitude (V) | 5.89±0.01[2] |
| Characteristics | |
| Evolutionary stage | RGB[3] |
| Spectral type | K5 III[4] |
| U−B color index | +2.02[5] |
| B−V color index | +1.71[5] |
| Astrometry | |
| Radial velocity (Rv) | 0.3±0.4[6] km/s |
| Proper motion (μ) | RA: +1.597 mas/yr[1] Dec.: −37.819 mas/yr[1] |
| Parallax (π) | 4.3006±0.0707 mas[1] |
| Distance | 760 ± 10 ly (233 ± 4 pc) |
| Absolute magnitude (MV) | −0.56[7] |
| Details | |
| Mass | 2.1[8] M☉ |
| Radius | 59.9[9] R☉ |
| Luminosity | 598±13[10] L☉ |
| Surface gravity (log g) | 0.99±0.02[3] cgs |
| Temperature | 3941±122[9] K |
| Rotational velocity (v sin i) | 2.3±1.2[11] km/s |
| Other designations | |
| 49 G. Octantis[12], CPD−81°906, GC 28578, HD 194612, HIP 101843, HR 7812, SAO 258864[13] | |
| Database references | |
| SIMBAD | data |
HD 194612 (HR 7812) is a solitary[14] orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.9,[2] making it visible to the naked eye under ideal conditions. Parallax measurements place it at a distance of 760 light years[1] and it has a low heliocentric radial velocity of 0.3 km/s.[6]
This is a red giant with a stellar classification of K5 III,[4] and Gaia DR3 stellar evolution models place it on the red giant branch.[3] It has double the mass of the Sun[8] and an enlarged radius of 59.9 R☉[9] due to its evolved status. It shines with a luminosity of 598 L☉[10] from its photosphere at an effective temperature of 3,941 K.[9] Like many giants, HD 194612 has a comparatively modest projected rotational velocity, which is around 2.3 km/s.[11]
