AU Microscopii
Star in the constellation Microscopium / From Wikipedia, the free encyclopedia
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.[5] The apparent visual magnitude of AU Microscopii is 8.73,[2] 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.[6][3]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Microscopium |
Right ascension | 20h 45m 09.53250s[1] |
Declination | –31° 20′ 27.2379″[1] |
Apparent magnitude (V) | 8.73[2] |
Characteristics | |
Spectral type | M1Ve[2] |
Apparent magnitude (V) | 8.627±0.052[3] |
Apparent magnitude (J) | 5.436±0.017[3] |
U−B color index | 1.01 |
B−V color index | 1.45 |
Variable type | Flare star |
Astrometry | |
Radial velocity (Rv) | −6.90±0.37[1] km/s |
Proper motion (μ) | RA: +281.319 mas/yr[1] Dec.: -360.148 mas/yr[1] |
Parallax (π) | 102.9432 ± 0.0231 mas[1] |
Distance | 31.683 ± 0.007 ly (9.714 ± 0.002 pc) |
Absolute magnitude (MV) | 8.61 |
Details | |
Mass | 0.60±0.04[3] M☉ |
Radius | 0.82±0.02[3] R☉ |
Luminosity | 0.102±0.002[3] L☉ |
Surface gravity (log g) | 4.52±0.05[3] cgs |
Temperature | 3665±31[3] K |
Rotation | 4.8367±0.0006 d[4] |
Rotational velocity (v sin i) | 8.5±0.2[3] km/s |
Age | 23±3, 18.5±2.4[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | data |
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