Astronomy:20 Camelopardalis
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Short description: Star in the constellation Camelopardalis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 05h 37m 27.0446s[1] |
| Declination | +56° 29′ 16.086″[1] |
| Apparent magnitude (V) | 7.45±0.01[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | G8 II-III[4] |
| U−B color index | +0.69[2] |
| B−V color index | +0.98[2] |
| Astrometry | |
| Radial velocity (Rv) | −50.3±2.3[5] km/s |
| Proper motion (μ) | RA: −0.534[1] mas/yr Dec.: −7.186[1] mas/yr |
| Parallax (π) | 3.7078 ± 0.1769[1] mas |
| Distance | 880 ± 40 ly (270 ± 10 pc) |
| Absolute magnitude (MV) | +1.39[6] |
| Details | |
| Mass | 1.83[7] M☉ |
| Radius | 12.54[8] R☉ |
| Luminosity | 142[5] L☉ |
| Surface gravity (log g) | 2.79[9] cgs |
| Temperature | 5,064[9] K |
| Metallicity [Fe/H] | −0.03[9] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
20 Camelopardalis (20 Cam) is a solitary star in the circumpolar constellation Camelopardalis. It has an apparent magnitude of 7.45, making it readily visible in binoculars but not to the naked eye. Located about 880 light years away, it is approaching the Solar System with a radial velocity of −50.3 km/s. Due to its faintness, 20 Cam is one of the 220 Flamsteed stars without Bright Star Catalog designations.[10]
20 Cam is a red clump[3] giant star with a spectral classification of G8 II-III.[4] It has a measured angular diameter of 0.44 mas,[11] with an actual radius of 13 R☉ at its estimated distance. It has 1.83 times the mass of the Sun and shines at 142 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 5,064 K, giving it a yellow glow. 20 Cam's metallicity – elements heavier than helium – is around solar level.[9]
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI.". Astronomy and Astrophysics Supplement Series 89: 415. ISSN 0365-0138. Bibcode: 1991A&AS...89..415O.
- ↑ 3.0 3.1 Rybka, S. P. (2007). "A catalogue of candidate Red Clump stars in the Tycho-2.". Kinematika I Fizika Nebesnykh Tel 23: 102. ISSN 0233-7665. Bibcode: 2007KFNT...23..102R.
- ↑ 4.0 4.1 Yoss, Kenneth M. (November 1961). "Spectral and Luminosity Classifications and Measurements of the Strength of Cyanogen Absorption for Late-Type Stars from Objective-Prism Spectra.". The Astrophysical Journal 134: 809. doi:10.1086/147209. ISSN 0004-637X. Bibcode: 1961ApJ...134..809Y.
- ↑ 5.0 5.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A.
- ↑ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. Bibcode: 2022A&A...657A...7K.
- ↑ 9.0 9.1 9.2 9.3 Ting, Yuan-Sen; Hawkins, Keith; Rix, Hans-Walter (3 May 2018). "A Large and Pristine Sample of Standard Candles across the Milky Way: ~100,000 Red Clump Stars with 3% Contamination". The Astrophysical Journal 858 (1): L7. doi:10.3847/2041-8213/aabf8e. ISSN 0004-637X. Bibcode: 2018ApJ...858L...7T.
- ↑ Bidelman, W. P. (1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"". Bulletin d'Information du Centre de Données Stellaires 38: 13. Bibcode: 1990BICDS..38...13B.
- ↑ Bourgés, L.; Lafrasse, S.; Mella, G.; Chesneau, O.; Bouquin, J. L.; Duvert, G.; Chelli, A.; Delfosse, X. (May 2014). "The JMMC Stellar Diameters Catalog v2 (JSDC): A New Release Based on SearchCal Improvements". Astronomical Data Analysis Software and Systems Xxiii 485: 223. Bibcode: 2014ASPC..485..223B.
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