HR 511
Star in the constellation Cassiopeia
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HR 511 (also designated V987 Cassiopeiae and Gliese 75 among others) is an orange dwarf of spectral type K0V in the constellation Cassiopeia. With an apparent magnitude of 5.63,[3] it is faintly visible to the naked eye. The star is relatively close, 32.8 light-years from the Sun, just above 10 parsecs.[2]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia[1] |
| Right ascension | 01h 47m 44.83444s[2] |
| Declination | +63° 51′ 09.0110″[2] |
| Apparent magnitude (V) | 5.63[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K0 V[4] |
| U−B color index | +0.40[3] |
| B−V color index | +0.80[4] |
| Astrometry | |
| Radial velocity (Rv) | +2.62±0.12[2] km/s |
| Proper motion (μ) | RA: +581.684 mas/yr[2] Dec.: −246.462 mas/yr[2] |
| Parallax (π) | 99.5902±0.0438 mas[2] |
| Distance | 32.75 ± 0.01 ly (10.041 ± 0.004 pc) |
| Absolute magnitude (MV) | 5.61[5] |
| Details | |
| Mass | 0.825±0.021[6] M☉ |
| Radius | 0.819±0.024[7] R☉ |
| Luminosity | 0.516±0.010[6] L☉ |
| Temperature | 5,407±4.0[8] K |
| Metallicity [Fe/H] | −0.02[9] dex |
| Rotation | 21.67 days[10] |
| Rotational velocity (v sin i) | 2.0[10] km/s |
| Age | 2.2 - 3.5[10] Gyr |
| Other designations | |
| V987 Cassiopeiae, BD+63°238, GJ 75, HD 10780, HIP 8362, HR 511, SAO 11983, LHS 1297, LTT 10619[11] | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
This star is estimated to be about the same age as the Sun, with 83% of the mass of the Sun and 82% of the Sun's radius. It has not been identified as a member of any moving star groups. This star has displayed unusual emissions of Ca II and is much more x-ray luminous than the Sun. It is considered a relatively active star.[10] Based on an iron abundance of [Fe/H] = −0.02, the metallicity of this star appears to be similar to that of the Sun.[9]