Phi2 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| φ2 Cnc A | |
| Right ascension | 08h 26m 47.07096s[1] |
| Declination | +26° 56′ 07.7588″[1] |
| Apparent magnitude (V) | 6.26[2] |
| φ2 Cnc B | |
| Right ascension | 08h 26m 46.83329s[3] |
| Declination | +26° 56′ 03.6655″[3] |
| Apparent magnitude (V) | 6.31[2] |
| Characteristics | |
| φ2 Cnc A | |
| Spectral type | A6V[2] |
| φ2 Cnc B | |
| Spectral type | A3V[2] |
| Astrometry | |
| φ2 Cnc A | |
| Proper motion (μ) | RA: −7.487 mas/yr[1] Dec.: +1.202 mas/yr[1] |
| Parallax (π) | 9.4528±0.0351 mas[1] |
| Distance | 345 ± 1 ly (105.8 ± 0.4 pc) |
| φ2 Cnc B | |
| Proper motion (μ) | RA: −10.112 mas/yr[3] Dec.: +0.110 mas/yr[3] |
| Parallax (π) | 9.3703 ± 0.0306 mas[3] |
| Distance | 348 ± 1 ly (106.7 ± 0.3 pc) |
| Details[4] | |
| φ2 Cnc A | |
| Mass | 1.8±0.3 M☉ |
| Radius | 3.19±0.10 R☉ |
| Luminosity | 32±1 L☉ |
| Surface gravity (log g) | 3.69±0.08 cgs |
| Temperature | 7,674±133 K |
| φ2 Cnc B | |
| Mass | 2.0±0.3 M☉ |
| Radius | 2.775±0.091 R☉ |
| Surface gravity (log g) | 3.85±0.07 cgs |
| Temperature | 8,147±121 K |
| Other designations | |
| φ2 Cnc, 23 Cancri, BD+27°1612, FK5 2633, HIP 41404[5] | |
| φ2 Cnc A: HD 71151, HR 3311, SAO 80188 | |
| φ2 Cnc B: HD 71150, HR 3310, SAO 80187 | |
| Database references | |
| SIMBAD | φ2 Cnc A |
| φ2 Cnc B | |
Phi2 Cancri (φ2 Cancri) is a binary star in the constellation Cancer. With a combined apparent magnitude of 5.54,[2] this system is faintly visible to the naked eye under ideal conditions. Parallax measurements give a distance of 345–348 light-years to this system.
Both components are separated by 5.126 arcseconds on the sky.[2] φ2 Cancri A, of apparent magnitude 6.26, has a spectral type A6V,[2] making it an A-type main sequence star. It has around 1.8 times the Sun's mass, 3.19 times the Sun's radius, and 32 times the Sun's luminosity.[4] φ2 Cancri B, of apparent magnitude 6.31, is also an A-type main sequence star, of spectral type A3V.[2] It has two times the Sun's mass, 2.8 times the radius, and a hotter surface temperature than φ2 Cancri A: 8,140 K versus 7,670 K.[4]
References
[edit]- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g h 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.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; De Lee, Nathan; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara; Fleming, Scott W.; Rose, Mark E.; Tenenbaum, Peter; Ting, Eric B. (2019-10-01), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467, ISSN 0004-6256.
- ^ "* phi02 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-09.
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