HD 194012
Star in the constellation Delphinus
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HD 194012 (HR 7793; Gliese 789) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.15,[3] making it visible to the naked eye under ideal conditions. The star is relatively close at a distance of only 85 light years[2] but is receding with a heliocentric radial velocity of 4.5 km/s.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus[1] |
| Right ascension | 20h 22m 52.3692s[2] |
| Declination | +14° 33′ 03.951″[2] |
| Apparent magnitude (V) | 6.15±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F7 V[4] |
| U−B color index | −0.07[5] |
| B−V color index | +0.51[5] |
| Astrometry | |
| Radial velocity (Rv) | 4.5±0.2[6] km/s |
| Proper motion (μ) | RA: +78.997 mas/yr[2] Dec.: −7.143 mas/yr[2] |
| Parallax (π) | 38.4009±0.0233 mas[2] |
| Distance | 84.93 ± 0.05 ly (26.04 ± 0.02 pc) |
| Absolute magnitude (MV) | +4.06[1] |
| Details | |
| Mass | 1.21+0.19 −0.16[7] M☉ |
| Radius | 1.18±0.04[7] R☉ |
| Luminosity | 1.9[8] L☉ |
| Surface gravity (log g) | 4.36[8] cgs |
| Temperature | 6,301±80[9] K |
| Metallicity [Fe/H] | −0.06[8] dex |
| Rotational velocity (v sin i) | 5[10] km/s |
| Age | 1.06[11] Gyr |
| Other designations | |
| AG+14°2196, BD+14°4275, GC 28343, GJ 789, HD 194012, HIP 100511, HR 7793, SAO 106042[12] | |
| Database references | |
| SIMBAD | data |
HD 194012 has a stellar classification of F7 V,[4] indicating that it is an ordinary F-type main-sequence star. It has 121% the mass of the Sun[7] and is estimated to be a billion years old,[11] spinning with a projected rotational velocity of 5 km/s.[10] The star's diameter is 118% that of the Sun[7] and shines with a luminosity of 1.9 L☉[8] from its photosphere at an effective temperature of 6,301 K,[9] giving a yellow white hue. HD 194012's metallicity is calculated to be 87% that of the Sun.[8]
A 2010 paper has identified a candidate substellar companion 12.78″ away along a position angle of 67.9°.[13] HD 194012 has been examined for infrared excess suggesting a debris disk but none was found.[14]