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