HD 30442
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis[1] |
| Right ascension | 04h 52m 05.2195s[2] |
| Declination | +63° 30′ 19.5173″[2] |
| Apparent magnitude (V) | 5.47±0.01[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M3 IIIab[5] |
| U−B color index | +1.76[6] |
| B−V color index | +1.55[6] |
| Astrometry | |
| Radial velocity (Rv) | −37±0.3[7] km/s |
| Proper motion (μ) | RA: +38.424 mas/yr[2] Dec.: −94.026 mas/yr[2] |
| Parallax (π) | 8.098±0.1027 mas[2] |
| Distance | 403 ± 5 ly (123 ± 2 pc) |
| Absolute magnitude (MV) | −0.44[1] |
| 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 | |
| BD+63°543, FK5 2362, GC 5881, HD 30442, HIP 22626, HR 1527, SAO 13291, WDS J04521+6330A[11] | |
| Database references | |
| SIMBAD | data |
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[3] and is estimated to be 403 light years away from the Solar System.[2] The object has a heliocentric radial velocity of −37 km/s, indicating that it is drifting closer.[7]
HD 30442 has a stellar classification of M3 IIIab,[5] indicating that it is a red giant. It is an asymptotic giant branch[4] star currently generating energy using hydrogen and helium shells around an 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]
