Eta Mensae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Mensa[1] |
| Right ascension | 04h 55m 11.20309s[2] |
| Declination | −74° 56′ 12.6705″[2] |
| Apparent magnitude (V) | 5.47[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[4] |
| Spectral type | K4 III[5][6] |
| U−B color index | +1.82[3] |
| B−V color index | +1.52[3] |
| Astrometry | |
| Proper motion (μ) | RA: +28.27[2] mas/yr Dec.: +61.52[2] mas/yr |
| Parallax (π) | 5.0299±0.0998 mas[7] |
| Distance | 650 ± 10 ly (199 ± 4 pc) |
| Absolute magnitude (MV) | −1.08[1] |
| Details | |
| Mass | 1.97[4] M☉ |
| Radius | 62[4] R☉ |
| Luminosity | 616[8] L☉ |
| Surface gravity (log g) | 1.15[9] cgs |
| Temperature | 4,055[8] K |
| Metallicity [Fe/H] | −0.17[9] dex |
| Age | 1.2[4] Gyr |
| Other designations | |
| η Men, CPD−75°290, FK5 1138, HD 32440, HIP 22871, HR 1629, SAO 256145[10] | |
| Database references | |
| SIMBAD | data |
Eta Mensae, Latinized from η Mensae, is the Bayer designation for a solitary,[6] orange-hued star in the southern constellation of Mensa. This object has an apparent visual magnitude of 5.47,[3] which is sufficiently luminous to be faintly visible to the naked eye. Based upon an annual parallax shift of 4.88 mas as seen from Earth,[2] this star is located roughly 670 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K4 III.[5] It is radiating 616 times the Sun's luminosity from its photosphere at an effective temperature of 4,055 K.[8] The star displays an infrared excess that suggests the presence of circumstellar dust.[11][12] Eta Mensae is a probable member of the stream of stars associated with the Hyades cluster.[13]
References
- ^ a b 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.
- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d 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.
- ^ a b c d 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.
- ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b 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.
- ^ 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.
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ a b Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423.
- ^ "eta Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-15.
{{cite web}}: CS1 maint: postscript (link) - ^ Kim, Sungsoo S.; et al. (April 2001), "Extent of Excess Far-Infrared Emission around Luminosity Class III Stars", The Astrophysical Journal, 550 (2): 1000–1006, arXiv:astro-ph/0012001, Bibcode:2001ApJ...550.1000K, doi:10.1086/319803, S2CID 118903790.
- ^ Zuckerman, B.; et al. (June 1995), "Luminosity Class III Stars with Excess Far-Infrared Emission", Astrophysical Journal Letters, 446: L79, Bibcode:1995ApJ...446L..79Z, doi:10.1086/187935.
- ^ Eggen, Olin J. (1996), "The Stellar Content of Star Stream I", Astronomical Journal, 111: 1615, Bibcode:1996AJ....111.1615E, doi:10.1086/117901.