Nu Microscopii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 20h 33m 55.07232s[1] |
| Declination | −44° 30′ 57.7663″[1] |
| Apparent magnitude (V) | 4.76[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B color index | +1.009[4] |
| B−V color index | +1.337±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | 8.7±2[5] km/s |
| Proper motion (μ) | RA: +11.727[1] mas/yr Dec.: -35.224[1] mas/yr |
| Parallax (π) | 12.9480 ± 0.1081 mas[1] |
| Distance | 252 ± 2 ly (77.2 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.84[2] |
| Details[6] | |
| Mass | 2.46 M☉ |
| Radius | 10.59+0.34 −0.08[1] R☉ |
| Luminosity | 59.5±0.6[1] L☉ |
| Surface gravity (log g) | 2.78 cgs |
| Temperature | 4,925+21 −77[1] K |
| Metallicity [Fe/H] | +0.05±0.10 dex |
| Rotational velocity (v sin i) | 2.02 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
ν Microscopii, Latinized as Nu Microscopii, is a star in the constellation Microscopium. It is an orange hued star that is visible to the naked eye as a faint point of light with an apparent visual magnitude of 4.76.[2] It was first catalogued as Nu Indi by the French explorer and astronomer Nicolas Louis de Lacaille in 1756, before being reclassified in Microscopium and given its current Bayer designation of Nu Microscopii by Gould.[8] The object is located at a distance of around 252 light-years from the Sun, based on parallax,[1] and is drifting further away with a radial velocity of about +9 km/s.
It is an aging giant star with a stellar classification of K0 III.[3] It has expanded to 10.6[1] times the girth of the Sun after exhausting the supply of hydrogen at its core and evolving off the main sequence. The star has 2.46 times the mass of the Sun.[6] It is radiating 59.5[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,925 K.[1]
References
[edit]- ^ a b c d e f g h i j k l 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.
- ^ a b c d 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.
- ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.Accessed using SIMBAD
- ^ Oja, T. (1970). "UBV-Fotometri danska Tel (ESO)". Private Communication. Bibcode:1970Priv.........0O.Accessed using SIMBAD
- ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
- ^ a b Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties". Astronomy & Astrophysics. 536: 71–76. arXiv:1110.6459. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. S2CID 55769003.
- ^ "nu. Mic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-01.
- ^ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, Virginia: The McDonald & Woodward Publishing Company. pp. 181, 210. ISBN 978-0-939923-78-6.
