Alpha Microscopii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 20h 49m 58.0821s[1] |
| Declination | −33° 46′ 47.000″[1] |
| Apparent magnitude (V) | 4.88 to 4.94[2] |
| Characteristics | |
| Spectral type | G7III[1] |
| U−B color index | +0.73[3] |
| B−V color index | +1.00[3] |
| Astrometry | |
| Radial velocity (Rv) | −14.5 ± 0.9[1] km/s |
| Proper motion (μ) | RA: 3.71[1] mas/yr Dec.: −20.19[1] mas/yr |
| Parallax (π) | 8.57 ± 0.80 mas[1] |
| Distance | 380 ± 40 ly (120 ± 10 pc) |
| Absolute magnitude (MV) | −0.45 ± 0.20[4] |
| Details | |
| Mass | 3.13 ± 0.18[4] M☉ |
| Radius | 16.4 ± 1.6[4] R☉ |
| Luminosity | 160[5] L☉ |
| Surface gravity (log g) | 2.47 ± 0.07[4] cgs |
| Temperature | 4,923[4] K |
| Metallicity [Fe/H] | +0.03[4] dex |
| Age | 0.36 ± 0.07[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Alpha Microscopii (Alpha Mic, α Microscopii, α Mic) is a G-type giant star in the constellation of Microscopium.[1] It has an apparent visual magnitude which varies between 4.88 and 4.94.[2]
This star has an optical visual companion, CCDM J20500-3347B, of apparent visual magnitude 10.0 approximately 20.4 arcseconds away at a position angle of 166°.[6] It has no physical connection to the star described above.[5][6]
References
- ^ a b c d e f g h i * alf Mic -- Star in double system, database entry, SIMBAD. Accessed on line September 4, 2008.
- ^ a b NSV 13329, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 4, 2008.
- ^ a b HR 7965, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 4, 2008.
- ^ a b c d e f g da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
- ^ a b Alpha Mic, Jim Kaler, Stars. Accessed on line September 4, 2008.
- ^ a b c Entry 20500-3347, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line September 4, 2008.
