7 Camelopardalis

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Template:Short description

7 Camelopardalis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension Template:RA[1]
Declination Template:DEC[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 Template:Engvar Template:Val[2]
Astrometry
Radial velocity (Rv)Template:Val[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]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd 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)Template:Val
Argument of periastron (ω)
(secondary)
Semi-amplitude (K1)
(primary)
Template:Val km/s
Details
7 Cam Aa
MassTemplate:Val[7] Template:Solar mass
LuminosityTemplate:Val[7] Template:Solar luminosity
TemperatureTemplate:Val[7] K
Rotational velocity (v sin i)40[7] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[8]
Database references
SIMBADdata

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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 Template:Val along a position angle of 242° from the primary, as of 2003.[3] It shares a common proper motion with the primary star.[11]

References

Template:Reflist

Template:Stars of Camelopardalis

  1. a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Anderson2012
  3. a b c d Cite error: Invalid <ref> tag; no text was provided for refs named WDSC2014
  4. a b Cite error: Invalid <ref> tag; no text was provided for refs named Cowley1969
  5. a b Cite error: Invalid <ref> tag; no text was provided for refs named deBruijne2012
  6. a b Cite error: Invalid <ref> tag; no text was provided for refs named straizys2021
  7. a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named zorec2012
  8. Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  9. Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  10. Cite error: Invalid <ref> tag; no text was provided for refs named Drummond2014
  11. Cite error: Invalid <ref> tag; no text was provided for refs named edr3c