2 Camelopardalis

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2 Camelopardalis
Observation data
Epoch J2000        Equinox J2000
Constellation Camelopardalis
Right ascension 04h 39m 58.06187s [1]
Declination +53° 28′ 22.4654″ [1]
Apparent magnitude  (V)5.36 [2]
Characteristics
A
Spectral type A8V [3]
U−B color index +0.05 [2]
B−V color index +0.34 [2]
Astrometry
Radial velocity (Rv)+20.1±3.2 [4] km/s
Proper motion (μ)RA: +44.269 [1] mas/yr
Dec.: −77.004 [1] mas/yr
Parallax (π)15.3220±0.3790  mas [1]
Distance 213 ± 5  ly
(65 ± 2  pc)
Orbit [5]
Primary2 Cam A
Companion2 Cam B
Period (P)26.34 ± 0.05  yr
Semi-major axis (a)0.1727 ± 0.0023″
Eccentricity (e)0.846 ± 0.005
Inclination (i)113.3 ± 3.4°
Longitude of the node (Ω)12.6 ± 2.5°
Periastron epoch (T)B 1988.98 ± 0.03
Argument of periastron (ω)
(secondary)		42.9 ± 2.6°
Orbit [5]
Primary2 Cam AB
Companion2 Cam C
Period (P)660  yr
Semi-major axis (a)1.666 ± 0.019″
Eccentricity (e)0.405 ± 0.015
Inclination (i)132.5 ± 1.9°
Longitude of the node (Ω)286.2 ± 1.8°
Periastron epoch (T)B 2011.7 ± 2.7
Argument of periastron (ω)
(secondary)		105.1 ± 5.4°
Details [5]
A
Mass 1.94  M☉
B
Mass 1.45  M☉
C
Mass 1.5  M☉
Other designations
2 Cam, BD+53°794, HD 29316, HIP 21730, HR 1466, SAO 24744, ADS 3358 ABC, CCDM J04400+5328ABC, WDS 04400+5328
Database references
SIMBAD 2 Cam
2 Cam AB
2 Cam C

2 Camelopardalis is a triple star [6] system in the northern circumpolar constellation of Camelopardalis, next to the southern constellation border with Perseus. It is dimly visible to the naked eye with a combined apparent visual magnitude of 5.36. [2] The system is located at a distance of about 213 light-years (65 parsecs ) from the Sun, based on its parallax. [1] It is drifting further away with a radial velocity of +20 km/s. [4]

The primary member of 2 Camelopardalis, designated component A, is an A-type main-sequence star with a spectral type of A8V. It has an apparent magnitude of 5.86, and has a secondary with an apparent magnitude of 7.35, designated component B. [7] The two orbit each other on a very eccentric orbit with a period of 26.34 years. [5] Further out, there is an eight-magnitude companion (designated component C), orbiting once every few hundred years. [5] As the third star was previously thought to be relatively massive for its luminosity, it was suspected of being a binary star itself, [8] but the current estimate of component C's magnitude as a single star matches its absolute magnitude. [5]

References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  3. ↑ Appenzeller, Immo (1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific. 79 (467): 102. Bibcode:1967PASP...79..102A. doi: 10.1086/128449 .
  4. 1 2 Holmberg, J.; Nordström, B.; Andersen, J. (2007). "The Geneva-Copenhagen survey of the Solar neighbourhood II". Astronomy and Astrophysics. 475 (2): 519. arXiv: 0707.1891 . Bibcode:2007A&A...475..519H. doi:10.1051/0004-6361:20077221. S2CID   119054949.
  5. 1 2 3 4 5 6 Tokovinin, A. (2021). "Inner and Outer Orbits in 13 Resolved Hierarchical Stellar Systems". The Astronomical Journal. 161 (3): 144. arXiv: 2101.02976 . Bibcode:2021AJ....161..144T. doi: 10.3847/1538-3881/abda42 . S2CID   231419112.
  6. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x , S2CID   14878976.
  7. ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 30 April 2017. Retrieved 4 April 2017.
  8. ↑ Heintz, W. D. (1996). "A Study of Multiple-Star Systems". The Astronomical Journal. 111: 408. Bibcode:1996AJ....111..408H. doi: 10.1086/117792 .
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