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Star in the constellation Camelopardalis From Wikipedia, the free encyclopedia
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.[2] Based on Gaia DR3 parallax measurements,[1] 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.[6] 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 |
Right ascension | 03h 57m 25.44460s[1] |
Declination | +63° 04′ 20.1498″[1] |
Apparent magnitude (V) | 5.04[2] |
Characteristics | |
Evolutionary stage | main sequence[3] |
Spectral type | B9 IV[4] or B9.5 V[5] |
U−B color index | −0.16[2] |
B−V color index | −0.10[2] |
Astrometry | |
Radial velocity (Rv) | 4.6±2.8[6] km/s |
Proper motion (μ) | RA: +7.146[1] mas/yr Dec.: +6.420[1] mas/yr |
Parallax (π) | 8.4614 ± 0.0947 mas[1] |
Distance | 385 ± 4 ly (118 ± 1 pc) |
Absolute magnitude (MV) | −0.27[7] |
Details | |
Mass | 3.14±0.05[3] M☉ |
Radius | 4.08±0.20[8] R☉ |
Luminosity | 156+12 −11[3] L☉ |
Surface gravity (log g) | 3.69±0.06[9] cgs |
Temperature | 10,520+72 −73[3] 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 | |
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 colleauges listed a stellar classification of B9.5 V,[5] matching a B-type main-sequence star. Slettebak (1982) gave it a class of B9 IV,[4] 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.[3]
It has an estimated 3.14 times the mass of the Sun[3] 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.[3] 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]
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