Astronomy:45 Eridani
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Short description: Star in the constellation Eridanus
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 04h 31m 52.66863s[2] |
| Declination | −00° 02′ 38.4398″[2] |
| Apparent magnitude (V) | 4.91[1] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K0/1 III[3] |
| U−B color index | +1.41[4] |
| B−V color index | +1.32±0.04[1] |
| Astrometry | |
| Radial velocity (Rv) | +15.32±0.15[2] km/s |
| Proper motion (μ) | RA: −1.469[2] mas/yr Dec.: −7.681[2] mas/yr |
| Parallax (π) | 3.7428 ± 0.0998[2] mas |
| Distance | 870 ± 20 ly (267 ± 7 pc) |
| Absolute magnitude (MV) | −1.59[1] |
| Details | |
| Mass | 5.4[2] M☉ |
| Radius | 71[2] R☉ |
| Luminosity | 1,587[2] L☉ |
| Surface gravity (log g) | 1.41[5] cgs |
| Temperature | 4,338[5] K |
| Metallicity [Fe/H] | −0.17[6] dex |
| Rotational velocity (v sin i) | <1.4[7] km/s |
| Age | 164[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
45 Eridani is a single[9] star located around 870 light years away from the Sun in the equatorial constellation of Eridanus. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.91.[1] This body is moving away from the Earth with a heliocentric radial velocity of +15 km/s.[2]
The stellar classification for this star is K0/1 III,[3] which indicates this is an aging K-type giant star that has exhausted the hydrogen supply at its core and expanded. It has reached 71 times the Sun's radius and is radiating 1,586 times the luminosity of the Sun[2] from its swollen photosphere at an effective temperature of 4,338 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ 5.0 5.1 5.2 5.3 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K.
- ↑ McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series 74: 1075–1128. doi:10.1086/191527. Bibcode: 1990ApJS...74.1075M.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ "45 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=45+Eri.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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