37 Cancri
37 Cancri is a star in the zodiac constellation of Cancer. It is a challenge to view with the naked eye, having an apparent magnitude of 6.54.[2] The star is moving away from the Earth with a heliocentric radial velocity of +22 km/s, having come as close as 246 light-years some 2.7 million years ago.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 38m 05.17248s[1] |
| Declination | +09° 34′ 28.6006″[1] |
| Apparent magnitude (V) | 6.542[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A1 V[4][5] |
| B−V color index | −0.010±0.006[6] |
| Astrometry | |
| Radial velocity (Rv) | +22.1±2.2[6] km/s |
| Proper motion (μ) | RA: −28.271[1] mas/yr Dec.: −4.237[1] mas/yr |
| Parallax (π) | 6.5093 ± 0.0735 mas[1] |
| Distance | 501 ± 6 ly (154 ± 2 pc) |
| Absolute magnitude (MV) | 1.30[6] |
| Details | |
| Mass | 2.66±0.05[3] M☉ |
| Radius | 1.8[7] R☉ |
| Luminosity | 30.9+3.0 −2.7[2] L☉ |
| Surface gravity (log g) | 4.30[2] cgs |
| Temperature | 9,830[2] K |
| Metallicity [Fe/H] | −0.21±0.13[2] dex |
| Rotational velocity (v sin i) | 35.2±1.1[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an ordinary A-type main-sequence star with a stellar classification of A1 V,[4] which indicates it is generating energy through hydrogen fusion at its core. It is spinning with a projected rotational velocity of 35 km/s.[2] The star has 2.7[3] times the mass of the Sun and around 1.8[7] times the Sun's radius. It is radiating 31 times the luminosity of the Sun from its photosphere at an effective temperature of 9,830 K.[2]
References
- 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.
- Royer, F.; et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics, 562: 21, arXiv:1401.2372, Bibcode:2014A&A...562A..84R, doi:10.1051/0004-6361/201322762, S2CID 54511685, A84.
- Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- "37 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-01.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
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