| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Microscopium |
| Right ascension | 21h 01m 17.4602s[1] |
| Declination | −32° 15′ 27.962″[1] |
| Apparent magnitude (V) | 4.677[1] |
| Characteristics | |
| Spectral type | G4III[1] |
| U−B color index | +0.54[2] |
| B−V color index | +0.89[2] |
| R−I color index | +0.32[2] |
| Astrometry | |
| Radial velocity (Rv) | 17.6 ± 0.9[1] km/s |
| Proper motion (μ) | RA: −2.09[1] mas/yr Dec.: −0.19[1] mas/yr |
| Parallax (π) | 14.59 ± 0.79[1] mas |
| Distance | 220 ± 10 ly (69 ± 4 pc) |
| Absolute magnitude (MV) | 0.5[3] |
| Details | |
| Mass | 2.5[4] M☉ |
| Radius | 10[4] R☉ |
| Luminosity | 64[4] L☉ |
| Temperature | 5100[4] K |
| Age | 6.2 × 108 [4] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma Microscopii (Gamma Mic, γ Microscopii, γ Mic) is the brightest star in the constellation of Microscopium.[4] It is a G-type giant star with an apparent visual magnitude of approximately 4.677, around 220 light-years from the Sun.[1] Backwards extrapolation of the motion of γ Microscopii has shown that approximately 3.8 million years ago, it was only 6 light-years away from the Sun. It would then have had an apparent magnitude of −3 and have been brighter than Sirius is now.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Microscopium |
| Right ascension | 21h 01m 19.4s[6] |
| Declination | −32° 15′ 29″[6] |
| Apparent magnitude (V) | 13.7[6] |
| Position (relative to A) | |
| Epoch of observation | 1964 |
| Angular distance | 25.7″ [5] |
| Position angle | 94° [5] |
| Other designations | |
| Database references | |
| SIMBAD | data |
The G-type giant star has a visual companion, CCDM J21013-3215B, approximately 26 arcseconds away, with an apparent visual magnitude of approximately 13.7.[5][6] It is believed that this star is not physically bound to γ Microscopii, but is merely an optical companion.[4]
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