AU Microscopii
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 two exoplanets, with the presence of an additional two planets being likely.
AU Microscopii, J band image, 2MASS. | |
| 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 | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
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