HD 24479

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]

HD 24479

Location of HD 117566 on the map (circled)
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 colleauges 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]