HD 24479
Star in the constellation Camelopardalis
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HD 24479, also designated as HR 1204, is a solitary,[15] bluish-white hued star located in the northern circumpolar constellation Camelopardalis. The star is visible to the naked eye with an apparent visual magnitude of 5.04.[3] Based on Gaia DR3 parallax measurements,[2] it is located 385 light years from the Sun. However, it is receding with a somewhat constrained heliocentric radial velocity of 4.6 km/s.[7] At its current distance, HD 24479's brightness is diminished by 0.29 magnitudes due to interstellar dust.[16]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 03h 57m 25.44460s[2] |
| Declination | +63° 04′ 20.1498″[2] |
| Apparent magnitude (V) | 5.04[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B9 IV[5] or B9.5 V[6] |
| U−B color index | −0.16[3] |
| B−V color index | −0.10[3] |
| Astrometry | |
| Radial velocity (Rv) | 4.6±2.8[7] km/s |
| Proper motion (μ) | RA: +7.146[2] mas/yr Dec.: +6.420[2] mas/yr |
| Parallax (π) | 8.4614±0.0947 mas[2] |
| Distance | 385 ± 4 ly (118 ± 1 pc) |
| Absolute magnitude (MV) | −0.27[1] |
| Details | |
| Mass | 3.14±0.05[4] M☉ |
| Radius | 4.08±0.20[8] R☉ |
| Luminosity | 156+12 −11[4] L☉ |
| Surface gravity (log g) | 3.69±0.06[9] cgs |
| Temperature | 10,520+72 −73[4] K |
| Metallicity [Fe/H] | −0.20[10] dex |
| Rotational velocity (v sin i) | 85±16[11] km/s |
| Age | 256±20[12] Myr |
| Other designations | |
| 22 H. Camelopardalis,[13]AG+62°326, BD+62°628, FK5 2281, GC 4730, HD 24479, HIP 18505, HR 1204, SAO 12969[14] | |
| Database references | |
| SIMBAD | data |
In 1932, HD 24479 was identified as a Be star by Olin C. Wilson at the Mount Wilson Observatory.[17] In 1969, astronomer Anne Cowley and her colleagues listed a stellar classification of B9.5 V,[6] matching a B-type main-sequence star. Slettebak (1982) gave it a class of B9 IV,[5] suggesting this instead an evolving subgiant star. Zorec and Royer (2012) model it to be an evolved dwarf star that has completed 85.9% of its main sequence lifetime.[4]
It has an estimated 3.14 times the mass of the Sun[4] and 4.1 times the Sun's radius,[8] which is large for its class. The star is radiating 156 times the Sun's luminosity[8] from its photosphere at an effective temperature of 10,250 K.[4] HD 24479 is estimated to be 256 million years old[12] and is spinning quickly with a projected rotational velocity of 85 km/s.[11]