HD 120565
Spectroscopic binary in the constellation Camelopardalis
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HD 120565, also designated as HR 5203, is a star located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.91. Gaia DR3 parallax measurements imply a distance of 370 light-years and it is currently drifting closer with a heliocentric radial velocity of −45.2 km/s. At its current distance, HD 120565's brightness is diminished by 0.12 magnitudes due to interstellar extinction[13] and it has an absolute magnitude of +0.48.[1]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 13h 42m 23.18342s[2] |
| Declination | +82° 45′ 08.7103″[2] |
| Apparent magnitude (V) | 5.91±0.01[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | G9 III[4] |
| B−V color index | +1.01[5] |
| Astrometry | |
| Radial velocity (Rv) | −45.2±1.2[6] km/s |
| Proper motion (μ) | RA: +29.995 mas/yr[2] Dec.: −43.734 mas/yr[2] |
| Parallax (π) | 8.8109±0.0364 mas[2] |
| Distance | 370 ± 2 ly (113.5 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.48[1] |
| Details | |
| Mass | 2.70±0.11[2] M☉ |
| Radius | 10.8+0.3 −0.2[7] R☉ |
| Luminosity | 64.1±0.5[2] L☉ |
| Surface gravity (log g) | 2.47[8] cgs |
| Temperature | 4,993±122[9] K |
| Metallicity [Fe/H] | −0.20[10] dex |
| Rotational velocity (v sin i) | 2.6±1[11] km/s |
| Age | 503+75 −70[2] Myr |
| Other designations | |
| AG+83°357, BD+83°397, FK5 1643, GC 18611, HD 120565, HIP 66878, HR 5203, SAO 2266[12] | |
| Database references | |
| SIMBAD | data |
HD 120565 has a stellar classification of G9 III,[4] indicating that it is an evolved G-type giant star. It has 2.7 times the mass of the Sun[2] but at the age of 503 million years,[2] it has expanded to 10.8 times the radius of the Sun.[7] It radiates 64.1 times the luminosity of the Sun[2] from its enlarged photosphere at an effective temperature of 4,993 K.[9] HD 120565 is metal deficient with an iron abundance 63.1% that of the Sun's or [Fe/H] = −0.22,[10] and it spins modestly with a projected rotational velocity of 2.6 km/s.[11] It was determined to be a single-lined spectroscopic binary by J.R. De Mederios and J. R. P. da Silva based on radial velocity variations.[11]