30 Camelopardalis

30 Camelopardalis
Location of 30 Cam on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 05h 52m 17.25442s[1]
Declination +58° 57′ 50.7189″[1]
Apparent magnitude (V) 6.13±0.01[2]
Characteristics
Evolutionary stage main sequence
Spectral type A0 Vs[3]
U−B color index −0.14[4]
B−V color index −0.04[4]
Astrometry
Radial velocity (Rv)12±3.7[5] km/s
Proper motion (μ) RA: −0.939 mas/yr[1]
Dec.: −20.732 mas/yr[1]
Parallax (π)6.235 ± 0.0381 mas[1]
Distance523 ± 3 ly
(160.4 ± 1.0 pc)
Absolute magnitude (MV)+0.29[6]
Details
Mass2.77+0.36
−0.44[7] M☉
Radius3.20±0.16[8] R☉
Luminosity107.9+1.4
−1.5[1] L☉
Surface gravity (log g)3.87+0.09
−0.07[7] cgs
Temperature10,957[9] K
Metallicity [Fe/H]0.00[10] dex
Rotational velocity (v sin i)425:[11] km/s
Age294±40[1] Myr
Other designations
30 Cam, AG+58°504, BD+58°863, GC 7327, HD 38831, HIP 27731, HR 2006, SAO 25419[12]
Database references
SIMBADdata

30 Camelopardalis (HD 38831; HR 2006), or simply 30 Cam, is a solitary star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 6.13,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 523 light-years[1] and it is currently drifting away with a somewhat constrained radial velocity of 12 km/s.[5] At its current distance, 30 Cam's brightness is diminished by an interstellar extinction of 0.18 magnitudes[13] and it has an absolute magnitude of +0.29.[6]

30 Cam has a stellar classification of A0 Vs,[3] indicating that it is an A-type main-sequence star that is generating energy via hydrogen fusion at its core. In addition, the absorption lines in 30 Cam's spectrum are narrow and sharp, possibly due to slow rotation. It has 2.77 times the mass of the Sun[7] and 3.20 times the radius of the Sun.[8] It radiates 107.9 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 10,957 K,[9] giving it a bluish-white hue when viewed in the night sky. 30 Cam's ratio of its iron abundance to the amount of hydrogen is similar to the Sun's;[10] it is estimated to be 294 million years old.[1]

There have been many disagreements regarding the star's projected rotational velocity. Palmer et al. (1968) devised a velocity of 425 km/s,[11] the value being highly uncertain. This does not correlate with the spectral classification mentioned earlier. A 1974 focusing on bright hydrogen-emission stars stated that 30 Cam is indeed a slowly rotating star, but it does not give a value for its rotational velocity. [14]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR3 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 Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Crawford1963 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Phillip1980 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Palmer1968 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Irvine1975 was invoked but never defined (see the help page).