| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04 31 52.66831 |
| Declination | −00° 02′ 38.4407″ |
| Apparent magnitude (V) | 4.91 |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K0/1 III |
| U−B color index | +1.41 |
| B−V color index | +1.32±0.04 |
| Astrometry | |
| Radial velocity (Rv) | +15.22±0.35 km/s |
| Proper motion (μ) | RA: −1.149 mas/yr Dec.: −7.655 mas/yr |
| Parallax (π) | 4.6579 ± 0.2082 mas |
| Distance | 700 ± 30 ly (215 ± 10 pc) |
| Absolute magnitude (MV) | −1.59 |
| Details | |
| Radius | 50.06±1.73 R☉ |
| Luminosity | 787.9±40.1 L☉ |
| Surface gravity (log g) | 2.0 cgs |
| Temperature | 4322+58 −57 K |
| Metallicity | −0.17 dex |
| Other designations | |
| 45 Eri, BD−00°713, GC 5528, HD 28749, HIP 21139, HR 1437, SAO 131270 | |
| Database references | |
| SIMBAD | data |
45 Eridani is a single star located around 700 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. This body is moving away from the Earth with a heliocentric radial velocity of +15 km/s.
The stellar classification for this star is K0/1 III, which indicates this is an aging K-type giant star that has exhausted the hydrogen supply at its core and expanded. It has reached 50 times the Sun's radius and is radiating 788 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,322 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ 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. S2CID 119257644.
- ^ 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 "Compilation of Eggen's UBV data, transformed to UBV (unpublished)".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.
- ^ 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. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
- "45 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-28.
- 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
