Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 22m 52.3692s[1] |
Declination | +14° 33′ 03.9513″[1] |
Apparent magnitude (V) | 6.15±0.01[2] |
Characteristics | |
Spectral type | F7 V[3] |
U−B color index | −0.07[4] |
B−V color index | +0.51[4] |
Astrometry | |
Radial velocity (Rv) | 4.5±0.2[5] km/s |
Proper motion (μ) | RA: +78.997 mas/yr[1] Dec.: −7.143 mas/yr[1] |
Parallax (π) | 38.4009 ± 0.0233 mas[1] |
Distance | 84.93 ± 0.05 ly (26.04 ± 0.02 pc) |
Absolute magnitude (MV) | +4.06[6] |
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 | |
Database references | |
SIMBAD | data |
HD 194012 (HR 7793; Gliese 789) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.15,[2] making it visible to the naked eye under ideal conditions. The star is relatively close at a distance of only 85 light years[1] but is receding with a heliocentric radial velocity of 4.5 km/s.[5]
HD 194012 has a stellar classification of F7 V,[3] 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]
EDR3
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