HD 46509
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 06h 40m 32.25255s[2] |
| Declination | +71° 44′ 55.6296″[2] |
| Apparent magnitude (V) | 5.86±0.01[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | G9 III[4] or K0 III[5] |
| B−V color index | +1.19[6] |
| Astrometry | |
| Radial velocity (Rv) | −24.02±0.19[7] km/s |
| Proper motion (μ) | RA: +4.653 mas/yr[2] Dec.: +11.103 mas/yr[2] |
| Parallax (π) | 4.1248±0.0376 mas[2] |
| Distance | 791 ± 7 ly (242 ± 2 pc) |
| Absolute magnitude (MV) | −0.98[1] |
| Details | |
| Mass | 5.64±1.82[8] M☉ |
| Radius | 27.3±0.6[2] R☉ |
| Luminosity | 399±7[2] L☉ |
| Surface gravity (log g) | 2.34±0.11[8] cgs |
| Temperature | 4,675±92[8] K |
| Metallicity [Fe/H] | +0.12±0.05[8] dex |
| Rotational velocity (v sin i) | 1.5±1.2[9] km/s |
| Age | 339+78 −63[8] Myr |
| Other designations | |
| AG+71°216, BD+71°359, FK5 2511, GC 8630, HD 46509, HIP 31946, HR 2396, SAO 5925[10] | |
| Database references | |
| SIMBAD | data |
HD 46509, also designated as HR 2396, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a yellowish-orange hued point of light with an apparent magnitude of 5.86.[3] The object is located relatively far at a distance of 791 light-years based on Gaia DR3 parallax measurements,[2] but it is drifting closer with a heliocentric radial velocity of −24.02 km/s.[7] At its current distance, HD 46509's brightness is diminished by interstellar extinction of 0.31 magnitudes and it has an absolute magnitude of −0.98.[1]
HD 46509 has a stellar classification of either G9 III or K0 III,[4][5] with both classes indicating that it is an evolved red giant. It is estimated to be 339 million years old,[8] enough time for it to cool and expand to 27.3 times the radius of the Sun.[2] HD 46509 has about 5.6 times the mass of the Sun[8] and it radiates 399 times the luminosity of the Sun[2] from its enlarged photosphere at an effective temperature of 4,675 K.[8] It is metal enriched with an iron abundance 132% that of the Sun's ([Fe/H] = +0.12)[8] and like most giant stars, it spins slowly with a projected rotational velocity of approximately 1.5 km/s.[9]
