HD 77912
Star in the constellation Lynx
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HD 77912 is a single[8] star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.56.[3] The star is located 650 light years from the Sun, as determined from its annual parallax shift of 5.0 mas.[2] It is moving further away with a heliocentric radial velocity of +16.6 km/s.[1] HD 77912 has a peculiar velocity of 23.1+2.9
−1.1 km/s, which may mark it as a runaway star.[9]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx[1] |
| Right ascension | 09h 06m 31.76860s[2] |
| Declination | +38° 27′ 07.9756″[2] |
| Apparent magnitude (V) | 4.56[3] |
| Characteristics | |
| Spectral type | G7 II Ba0.2[4] |
| B−V color index | 1.037±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | +16.6±0.2[1] km/s |
| Proper motion (μ) | RA: −27.653[2] mas/yr Dec.: −15.055[2] mas/yr |
| Parallax (π) | 5.0045±0.1977 mas[2] |
| Distance | 650 ± 30 ly (200 ± 8 pc) |
| Absolute magnitude (MV) | −1.46±0.093[5] |
| Details | |
| Mass | 4.60[6] M☉ |
| Radius | 33±5[3] R☉ |
| Luminosity | 1,168.35[1] L☉ |
| Surface gravity (log g) | 1.75[6] cgs |
| Temperature | 4,899[6] K |
| Metallicity [Fe/H] | −0.14[6] dex |
| Other designations | |
| BD+39°2200, FK5 1237, HD 77912, HIP 44700, HR 3612, SAO 61254[7] | |
| Database references | |
| SIMBAD | data |
The stellar classification of HD 77912 is G7 II Ba0.2,[4] indicating it is a bright giant with a mild overabundance of barium. It has 4.6 times the mass of the Sun[6] and has expanded to 33 times the Sun's radius.[3] The star is radiating 1,168 times the Sun's luminosity[1] from its enlarged photosphere at an effective temperature of 4,899 K.[6]