HD_7977

HD 7977

HD 7977

Star in the constellation Cassiopeia

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]

Schematic view to scale of past and future close approaches to the Sun (up to Alpha Centauri), which includes HD 7977
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...

References

  1. [1]
    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.
  2. [2]
    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.
  3. [3]
    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.
  4. [4]
    Guide, Universe. "HD 7977 Star Distance, Colour, Size (Radius) and other Facts". www.universeguide.com. Retrieved 2023-11-08.
  5. [5]
    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.
  6. [6]
    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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