4 Camelopardalis

4 Camelopardalis
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 04h 48m 00.2729s[1]
Declination +56° 45′ 25.837″[1]
Apparent magnitude (V) 5.29[2]
Characteristics
Spectral type A3m[3]
U−B color index 0.12[4]
B−V color index 0.246±0.003[2]
Astrometry
Radial velocity (Rv)+22.50±0.9[5] km/s
Proper motion (μ) RA: +52.892[1] mas/yr
Dec.: −140.618[1] mas/yr
Parallax (π)18.4464 ± 0.1109 mas[1]
Distance177 ± 1 ly
(54.2 ± 0.3 pc)
Absolute magnitude (MV)1.68[2]
Orbit[6]
PrimaryAa
CompanionAb
Period (P)90 yr
Semi-major axis (a)0.503″
Eccentricity (e)0.87
Inclination (i)120.0°
Longitude of the node (Ω)54.5°
Argument of periastron (ω)
(secondary)		235.9°
Details
Mass2.01[7] M☉
Radius2.57+0.05
−0.17[8] R☉
Luminosity17.64[2] L☉
Surface gravity (log g)3.98[9] cgs
Temperature7,700[9] K
Metallicity [Fe/H]+0.27[9] dex
Rotational velocity (v sin i)75[10] km/s
Age560[7] Myr
Other designations
4 Cam, BD+56°973, FK5 175, HD 30121, HIP 22287, HR 1511, SAO 24829[11]
Database references
SIMBADdata

4 Camelopardalis is a probable multiple star in the northern constellation of Camelopardalis,[11] located 177 light years away from the Sun, based upon parallax.[1] With a combined apparent visual magnitude of 5.29,[2] it is visible to the naked eye as a faint, white-hued star. The pair have a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.158″ per year.[12] The system's proper motion makes it a candidate for membership in the IC 2391 supercluster.[13] They are moving away from the Earth with a heliocentric radial velocity of 22.5 km/s.[5]

The brighter member, designated component A, is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements.[14] It is an estimated 560[7] million years old and is spinning with a projected rotational velocity of 75[10] The star has 2.01[7] times the mass of the Sun and 2.57[8] times the Sun's radius. It is radiating 18[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,700 K.[9]

There is a faint, magnitude 9.49 companion at an angular separation of 0.610″ – component B; the pair most likely form a binary systemwith a period of about 90 years.[6] There is also a 13th-magnitude visual companion 13″ away which shares a common proper motion and parallax.[15][6] Another listed companion, a 12th-magnitude star nearly 2′ away, is probably unrelated.[16]

  1. ^ a b c d e f Cite error: The named reference edr3 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference tokovinin2019 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference DeRosa2014 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Takeda2018 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference aaa393_3_897 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggen1995 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference aaa498_3_961 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference edr3b was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference edr3c was invoked but never defined (see the help page).