HD 30442 (HR 1527) is a solitary[12] star in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with an apparent magnitude of 5.47[2] and is estimated to be 403 light years away from the Solar System.[1] The object has a heliocentric radial velocity of −37 km/s, indicating that it is drifting closer.[6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Camelopardalis |
Right ascension | 04h 52m 05.2195s[1] |
Declination | +63° 30′ 19.5173″[1] |
Apparent magnitude (V) | 5.47±0.01[2] |
Characteristics | |
Evolutionary stage | AGB[3] |
Spectral type | M3 IIIab[4] |
U−B color index | +1.76[5] |
B−V color index | +1.55[5] |
Astrometry | |
Radial velocity (Rv) | −37±0.3[6] km/s |
Proper motion (μ) | RA: +38.424 mas/yr[1] Dec.: −94.026 mas/yr[1] |
Parallax (π) | 8.098 ± 0.1027 mas[1] |
Distance | 403 ± 5 ly (123 ± 2 pc) |
Absolute magnitude (MV) | −0.44[7] |
Details | |
Mass | 1.09[8] M☉ |
Radius | 70.85[9] R☉ |
Luminosity | 1,096+106 −96[10] L☉ |
Surface gravity (log g) | 0.92[8] cgs |
Temperature | 3,500±150[10] K |
Metallicity [Fe/H] | 0.00[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
HD 30442 has a stellar classification of M3 IIIab,[4] indicating that it is a red giant. It is an asymptotic giant branch[3] star currently generating energy using hydrogen and helium shells around a inert carbon core. It has 109% the mass of the Sun[8] and has an enlarged radius of 70.8 R☉[9] due to its evolved state. It radiates at almost 1,100 times the luminosity of the Sun from its photosphere at an effective temperature of 3,500 K,[10] giving a red hue. HD 30442 is estimated to have a solar metallicity,[8] with an abundance of iron equivalent to that of the Sun.
HD 30442 has a companion 120″ away along a position angle of 350°.[13] It shares a common proper motion with HD 30442, suggesting physical relation, but its parallax indicates otherwise.[14]