AU Microscopii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 20h 45m 09.53250s |
| Declination | –31° 20′ 27.2379″ |
| Apparent magnitude (V) | 8.73 |
| Characteristics | |
| Spectral type | M1Ve |
| Apparent magnitude (V) | 8.627±0.052 |
| Apparent magnitude (J) | 5.436±0.017 |
| U−B color index | 1.01 |
| B−V color index | 1.45 |
| Variable type | Flare star |
| Astrometry | |
| Radial velocity (Rv) | −6.90±0.37 km/s |
| Proper motion (μ) | RA: +281.319 mas/yr Dec.: -360.148 mas/yr |
| Parallax (π) | 102.9432±0.0231 mas |
| Distance | 31.683 ± 0.007 ly (9.714 ± 0.002 pc) |
| Absolute magnitude (MV) | 8.61 |
| Details | |
| Mass | 0.60±0.04 M☉ |
| Radius | 0.82±0.02 R☉ |
| Luminosity | 0.102±0.002 L☉ |
| Surface gravity (log g) | 4.52±0.05 cgs |
| Temperature | 3665±31 K |
| Rotation | 4.8367±0.0006 d |
| Rotational velocity (v sin i) | 8.5±0.2 km/s |
| Age | 23±3, 18.5±2.4 Myr |
| Other designations | |
| CD -31°17815, GCTP 4939.00, GJ 803, HD 197481, HIP 102409, LTT 8214, SAO 212402, Vys 824, LDS 720 A. | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
AU Microscopii (AU Mic) is a young red dwarf star located 31.7 light-years (9.7 parsecs) away – about 8 times as far as the closest star after the Sun. The apparent visual magnitude of AU Microscopii is 8.73, which is too dim to be seen with the naked eye. It was given this designation because it is in the southern constellation Microscopium and is a variable star. Like β Pictoris, AU Microscopii has a circumstellar disk of dust known as a debris disk and at least three exoplanets, with the presence of an additional planet being likely.