HR 968
  | |
| Observation data Epoch J2000.0 Equinox 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 mas[2] |
| 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 | |
| CD−44°1025, HD 20121, HR 968, SAO 216209[5] | |
| 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
[edit]- 1 2 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 4 "VizieR Detailed Page". Archived from the original on 2016-03-05. Retrieved 2012-07-13.
- 1 2 3 Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5.
- ↑ "HR 968". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-09-10.
- ↑ 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.
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