HD 30442

HD 30442
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]
Distance403 ± 5 ly
(123 ± 2 pc)
Absolute magnitude (MV)−0.44[7]
Details
Mass1.09[8] M☉
Radius70.85[9] R☉
Luminosity1,096+106
−96[10] L☉
Surface gravity (log g)0.92[8] cgs
Temperature3,500±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
SIMBADdata

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]

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]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Yamashita1967 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Charbonnel2020 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference EDR3B was invoked but never defined (see the help page).