62 Eridani

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62 Eridani
Eridanus constellation map.svg
Red circle.svg
Location of b Eridani (circled)
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Eridanus [1]
Right ascension 04h 56m 24.18609s [2]
Declination −05° 10′ 16.8710″ [2]
Apparent magnitude  (V)5.48 [3]
Characteristics
Spectral type B5III [4]
B−V colour index −0.123±0.004 [1]
Astrometry
Radial velocity (Rv)24±4.3 [5] km/s
Proper motion (μ)RA: −6.395 mas/yr [2]
Dec.: −1.809 mas/yr [2]
Parallax (π)4.5440±0.1145  mas [2]
Distance 720 ± 20  ly
(220 ± 6  pc)
Absolute magnitude  (MV)−1.23 [1]
Details
Aa
Mass 5.69 [6]   M☉
Ab
Mass 1.46 [6]   M☉
Other designations
b Eri, 62 Eridani, BD−05 1091, GC 5894, HD 31512, HIP 22958, HR 1582, SAO 149924, PPM 214891, TYC 5899-1192-1 [7]
Database references
SIMBAD Star

62 Eridani (b Eri) is a double star located in the Eridanus constellation and is approximately 720 light-years away. The combined apparent magnitude of the two stars is 5.5.

The two stars are 0.6″ apart and have an estimated orbital period of 633 years. The primary component is a hot blue giant star with a spectral class of B5III and a mass of about 5.7  M☉. [6] Despite the giant luminosity class, it is modelled to still be on the main sequence. [2] [8] Other publications have given spectral classes of B5V or B6V. [9] The secondary is magnitude 9.6 and has a mass of about 1.5 M☉. [6]

62 Eridani moves within the galaxy at a speed of 24.2 km/sec relative to the Sun. Its distance from the galactic center is estimated to be between 24,700 and 29,700 light-years. [10]

The 9th-magnitude star BD−05°1093 is a possible common proper motion companion 66″ away. [6]

References

  1. 1 2 3 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.
  2. 1 2 3 4 5 6 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.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
  4. ↑ Houk, N.; Swift, C. (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. Michigan Spectral Survey. Vol. 5. Ann Arbor: Deptment of Astronomy, University of Michigan. Bibcode:1999MSS...C05....0H.
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo compilation of radial velocities for 35495 stars in a common system". Astronomy Letters . 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  6. 1 2 3 4 5 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 .
  7. ↑ "b Eridani". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2025-09-05.
  8. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv: 1201.2052 . Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  9. ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- )". Vizier Online Data Catalog. Bibcode:2014yCat....1.2023S.
  10. ↑ 62 Eridani, a blue giant star in Eridanus [ dead link ]
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