// Workers AI · dad joke modeWhat did Epsilon Circini say? "I'm a little off.
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Circinus[1] |
| Right ascension | 15h 17m 38.89307s[2] |
| Declination | −63° 36′ 37.6831″[2] |
| Apparent magnitude (V) | 4.86[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K2.5 III[4] |
| U−B color index | +1.32[3] |
| B−V color index | +1.260±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | −3.72±0.42[2] km/s |
| Proper motion (μ) | RA: +3.209[2] mas/yr Dec.: +9.344[2] mas/yr |
| Parallax (π) | 7.5809±0.1085 mas[2] |
| Distance | 430 ± 6 ly (132 ± 2 pc) |
| Absolute magnitude (MV) | −0.63[1] |
| Details | |
| Mass | 4.3[2] M☉ |
| Radius | 24[2] R☉ |
| Luminosity | 338[2] L☉ |
| Surface gravity (log g) | 2.22[2] cgs |
| Temperature | 4,767[2] K |
| Other designations | |
| ε Cir, CPD−63°3544, FK5 3205, HD 135291, HIP 74837, HR 5666, SAO 253088[5] | |
| Database references | |
| SIMBAD | data |
Epsilon Circini is a solitary[6] star located in the southern constellation of Circinus. Its name is a Bayer designation that is Latinized from ε Circini, and abbreviated Epsilon Cir or ε Cir. This star is faintly visible to the naked eye, having an apparent visual magnitude of 4.86.[3] The distance to this star, as determined by a measured annual parallax shift of 7.58 mas, is around 430 light-years (132 pc). It is drifting closer to the Sun with a radial velocity of −4 km/s.
This is an evolved K-type giant star with a stellar classification of K2.5 III.[4] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24 times the girth of the Sun. It radiates about 338 times the solar luminosity from its photosphere at an effective temperature of 4,767 K.[2]
References
[edit]- 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.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 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.
- 1 2 3 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- 1 2 Landi Dessy, J.; Keenan, P. C. (November 1966), "Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6", Astrophysical Journal, 146: 587, Bibcode:1966ApJ...146..587L, doi:10.1086/148925.
- ↑ "eps Cir", SIMBAD, Centre de données astronomiques de Strasbourg
- ↑ 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.
