| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08 00 47.30744 |
| Declination | +17° 18′ 31.3283″ |
| Apparent magnitude (V) | 5.60 |
| Characteristics | |
| Evolutionary stage | horizontal branch(86%chance) |
| Spectral type | K3 III |
| B−V color index | 1.317 |
| Astrometry | |
| Radial velocity (Rv) | +39.55±0.16 km/s |
| Proper motion (μ) | RA: −10.403 mas/yr Dec.: −3.905 mas/yr |
| Parallax (π) | 4.0087 ± 0.1511 mas |
| Distance | 810 ± 30 ly (249 ± 9 pc) |
| Absolute magnitude (MV) | −1.29 |
| Details | |
| Mass | 2.9 M☉ |
| Radius | 40 R☉ |
| Luminosity | 568.61 L☉ |
| Surface gravity (log g) | 2.05 cgs |
| Temperature | 4,300 K |
| Rotational velocity (v sin i) | 5.73 km/s |
| Other designations | |
| 3 Cnc, BD+17°1731, FK5 2618, HD 65759, HIP 39177, HR 3128, SAO 97472 | |
| Database references | |
| SIMBAD | data |
3 Cancri is a single star in the zodiac constellation of Cancer, located around 810 light years from the Sun. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.60. This object is moving further from the Earth with a heliocentric radial velocity of +39.5 km/s, and may be a member of the Hyades group. It is located near the ecliptic and thus is subject to lunar eclipses.
This is an aging giant star with a stellar classification of K3 III that is most likely (86% chance) on the horizontal branch. The star has 2.9 times the mass of the Sun and has expanded to 40 times the Sun's radius. It is radiating 569 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,300 K.
Planetary system
One super-Jupiter exoplanet orbiting 3 Cancri was detected in 2020 on a very mildly eccentric orbit using the radial velocity method.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (]s) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 20.76 MJ | 2.52 | 853.64 | 0.4 | — | — |
See also
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.
- ^ 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.
- ^ Stock, S.; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv:0709.1145, Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, S2CID 119361866, A33.
- ^ Adams, Walter S.; et al. (1935), "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars", Astrophysical Journal, 81: 187, Bibcode:1935ApJ....81..187A, doi:10.1086/143628
- ^ Hekker, S.; Meléndez, J. (2007), "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters", Astronomy and Astrophysics, 475 (3): 1003–1009, arXiv:0709.1145, Bibcode:2007A&A...475.1003H, doi:10.1051/0004-6361:20078233, S2CID 10436552.
- "3 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-02-22.
- 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.
- Eggen, O. J. (June 1972), "The red giants in the Hyades group", Publications of the Astronomical Society of the Pacific, 84: 406, Bibcode:1972PASP...84..406E, doi:10.1086/129303.
- White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal, 94: 751, Bibcode:1987AJ.....94..751W, doi:10.1086/114513.
- Pinto, Marcelo Tala; Reffert, Sabine; Quirrenbach, Andreas; Stock, Stephan; Trifonov, Trifon; Mitchell, David S. (2020). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 644: A1. doi:10.1051/0004-6361/202038285. hdl:10150/622444.
- "The Extrasolar Planet Encyclopaedia — 3 Cnc b". Extrasolar Planets Encyclopaedia. Retrieved 2021-04-29.
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