7 Camelopardalis

7 Camelopardalis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension 04h 57m 17.19609s[1]
Declination +53° 45′ 07.5654″[1]
Apparent magnitude (V) 4.43[2] (4.49 + ? + 7.90 + 11.30)[3]
Characteristics
Evolutionary stage main sequence
Spectral type A1 V[4]
B−V color index −0.017±0.003[2]
Astrometry
Radial velocity (Rv)−9.5±3.7[5] km/s
Proper motion (μ) RA: −24.51[1] mas/yr
Dec.: +7.71[1] mas/yr
Parallax (π)8.77 ± 0.60 mas[1]
Distance370 ± 30 ly
(114 ± 8 pc)
Absolute magnitude (MV)−0.84[2]
Orbit[6]
Primary7 Cam Aa
Companion7 Cam Ab
Period (P)3.884 d
Eccentricity (e)0
Periastron epoch (T)2,457,726.05 JD
Argument of periastron (ω)
(secondary)		0°
Semi-amplitude (K1)
(primary)		34.9±0.2 km/s
Details
7 Cam Aa
Mass3.16±0.10[7] M☉
Luminosity221.6+36.8
−31.5[7] L☉
Temperature9,226+236
−231[7] K
Rotational velocity (v sin i)40[7] km/s
Other designations
7 Cam, BD+53°829, GC 6017, HD 31278, HIP 23040, HR 1568, SAO 24929, ADS 3536, WDS J04573+5345[8]
Database references
SIMBADdata

7 Camelopardalis is a multiple star system[9] in the northern circumpolar constellation of Camelopardalis. It is located approximately 370 light years from the Sun, as determined from its parallax.[1] This system is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 4.43.[2] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s.[5]

The primary member of the group, designated component A, is a single-lined spectroscopic binary system with a circular orbit and a period of 3.88 days.[6] The visible component of this pair is a magnitude 4.49[3] A-type main-sequence star with a stellar classification of A1 V.[4] It has 3.2 times the mass of the Sun and is spinning with a projected rotational velocity of 40 km/s. The star is radiating 222 times the Sun's luminosity from its photosphere at an effective temperature of 9,226 K.[7]

The magnitude 7.90[3] component B has an orbital solution with the Aa/Ab pair, which yields a period of 284 years and an eccentricity of 0.74. However, Drummond (2014) found the data to be discordant and instead determined that they are an optical pair with no physical association.[10] The fourth member, component C, is a magnitude 11.30 star at an angular separation of 25.50″ along a position angle of 242° from the primary, as of 2003.[3] It shares a common proper motion with the primary star.[11]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference straizys2021 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Drummond2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference edr3c was invoked but never defined (see the help page).