Astronomy:HR 968
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Short description: Triple star system
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 03h 12m 25.75s[2] |
| Declination | −44° 25′ 10.8″[2] |
| Apparent magnitude (V) | 5.93[3] |
| Characteristics | |
| Spectral type | F7III+A0V[3] |
| B−V color index | +0.44[3] |
| Astrometry | |
| Proper motion (μ) | RA: +81.63[2] mas/yr Dec.: −4.57[2] mas/yr |
| Parallax (π) | 23.53 ± 0.62[2] mas |
| Distance | 139 ± 4 ly (42 ± 1 pc) |
| Absolute magnitude (MV) | +2.78[1] |
| Orbit[4] | |
| Period (P) | 44.93 yr |
| Semi-major axis (a) | 0.399″ |
| Eccentricity (e) | 0.891 |
| Inclination (i) | 180° |
| Details[4] | |
| A | |
| Mass | 1.34 M☉ |
| B | |
| Mass | 1.24 M☉ |
| C | |
| Mass | 0.87 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
| C | |
HR 968 (HD 20121) is a triple star in the Eridanus constellation with an apparent magnitude of 5.93. A close pair, a magnitude 6.6 F-type star and a magnitude 6.9 A-type star, are accompanied by a fainter common proper motion companion 3.6″ away.[4] The three combined are barely visible to the naked eye.[3] It had the Bayer designation u Eridani by Nicolas Louis de Lacaille before Francis Baily dropped the title.[6]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 3.0 3.1 3.2 3.3 "VizieR Detailed Page". http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=5050&-corr=PK=HR&-out.max=9999&HR=968. Retrieved 2012-07-13.
- ↑ 4.0 4.1 4.2 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T.
- ↑ "HR 968". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+968.
- ↑ Morton Wagman (2003). Lost Stars: Lost, Missing, and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas-Louis de Lacaille, John Flamsteed, and Sundry Others (2 ed.). McDonald & Woodward Publishing Company. ISBN 978-0-939923-78-6. OCLC 1131243914. https://books.google.com/books?id=TYLvAAAAMAAJ.
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