  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 47m 44.83444s[1] |
| Declination | +63° 51′ 09.0110″[1] |
| Apparent magnitude (V) | 5.63[2] |
| Characteristics | |
| Spectral type | K0 V[3] |
| U−Bcolor index | +0.40[2] |
| B−Vcolor index | +0.80[3] |
| Astrometry | |
| Radial velocity (Rv) | +2.62±0.12[1] km/s |
| Proper motion (μ) | RA: +581.684mas/yr[1] Dec.: −246.462mas/yr[1] |
| Parallax (π) | 99.5902±0.0438 mas[1] |
| Distance | 32.75 ± 0.01 ly (10.041 ± 0.004 pc) |
| Absolute magnitude (MV) | 5.61[4] |
| Details | |
| Mass | 0.825±0.021[5] M☉ |
| Radius | 0.819±0.024[6] R☉ |
| Luminosity | 0.516±0.010[5] L☉ |
| Temperature | 5,407±4.0[7] K |
| Metallicity [Fe/H] | −0.02[8] dex |
| Rotation | 21.67 days[9] |
| Rotational velocity (v sin i) | 2.0[9] km/s |
| Age | 2.2 - 3.5[9] Gyr |
| Other designations | |
| V987 Cassiopeiae,BD+63°238,GJ 75,HD 10780,HIP 8362,HR 511,SAO 11983,LHS 1297,LTT 10619[10] | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HR 511 (also designatedV987 Cassiopeiae andGliese 75 among others) is anorange dwarf ofspectral type K0V in theconstellationCassiopeia. With anapparent magnitude of 5.63,[2] it is faintly visible to thenaked eye. The star is relatively close, 32.8light-years from theSun.[1]
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 anymoving star groups. This star has displayed unusual emissions ofCa II and is much morex-ray luminous than the Sun. It is considered a relatively active star.[9] Based on an iron abundance of [Fe/H] = −0.02, themetallicity of this star appears to be similar to that of the Sun.[8]
