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,[2] it is faintly visible to the naked eye. The star is relatively close, 32.8 light years from the Sun.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 01h 47m 44.83363s[1] |
Declination | +63° 51′ 09.0073″[1] |
Apparent magnitude (V) | 5.63[2] |
Characteristics | |
Spectral type | K0 V[3] |
U−B color index | +0.40[2] |
B−V color index | +0.80[3] |
Astrometry | |
Radial velocity (Rv) | +1.41[3] km/s |
Proper motion (μ) | RA: +582.028±0.070[1] mas/yr Dec.: −246.228±0.086[1] mas/yr |
Parallax (π) | 99.5746 ± 0.0595 mas[1] |
Distance | 32.75 ± 0.02 ly (10.043 ± 0.006 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 | |
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.[9] Based on an iron abundance of [Fe/H] = −0.02, the metallicity of this star appears to be similar to that of the Sun.[8]