HD 7977 (also designated as TYC 4034-1077-1 or USNO-A2 1500-01356484) is a G-type main-sequence star located in the constellation of Cassiopeia, around 246.9 light-years away from Earth. HD 7977 is notable for its close flyby of the Solar System 2.8 million years ago.[4] Its flyby may have taken it close enough to the Sun that it penetrated deep into the Oort Cloud and disturbed the population of Oort Cloud bodies and long-period comets there.[5] Its mass is equivalent to 1.07 times the Sun's mass.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 20m 31.596s[1] |
| Declination | +61° 52′ 57.01″[1] |
| Apparent magnitude (V) | 9.04[2] |
| Characteristics | |
| Spectral type | G3[3] |
| Astrometry | |
| Proper motion (μ) | RA: +0.144[1] mas/yr Dec.: +0.010[1] mas/yr |
| Parallax (π) | 13.2118 ± 0.0322 mas[1] |
| Distance | 246.9 ± 0.6 ly (75.7 ± 0.2 pc) |
| Details | |
| Mass | 1.07[1] M☉ |
| Radius | 1.09[1] R☉ |
| Luminosity | 1.20[1] L☉ |
| Surface gravity (log g) | 4.35[1] cgs |
| Temperature | 5,816[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b c d e f g h i j 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.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- ^ Schwassmann, Arnold; Van Rhijn, P. J. (1935). "Bergedorfer Spektral-Durchmusterung der 115 noerdlichen Kapteynschen Eichfelder - Bd.1: Eichfeld 1 bis 19, Deklination +90 deg., +75 deg., +60 deg". Bergedorf: Hamburger Sternwarte. Bibcode:1935bsdn.book.....S.
- ^ Guide, Universe. "HD 7977 Star Distance, Colour, Size (Radius) and other Facts". www.universeguide.com. Retrieved 2023-11-08.
- ^ Bobylev, V. V.; Bajkova, A. T. (2022). "Search for Close Stellar Encounters with the Solar System Based on Data from the Gaia DR3 Catalogue". Astronomy Letters. 48 (9): 542. arXiv:2206.14443. Bibcode:2022AstL...48..542B. doi:10.1134/S1063773722080011. S2CID 256832377.
- ^ de la Fuente Marcos, Raúl; de la Fuente Marcos, Carlos (2022). "The Closest Past Flyby of a Known Star to the Solar System: HD 7977, UCAC4 237-008148 or WISE J072003.20-084651.2?". Research Notes of the American Astronomical Society. 6 (7): 152. Bibcode:2022RNAAS...6..152D. doi:10.3847/2515-5172/ac842b.
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