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AT Microscopii
Star in the constellation Microscopium / From Wikipedia, the free encyclopedia
AT Microscopii is a binary star system located at a distance of 35 ly (11 pc) from the Sun in the constellation of Microscopium.[2] Both members are flare stars,[8] meaning they are red dwarf stars that undergo random eruptions that increase their brightness. This pair lies physically near the red dwarf star AU Microscopii, which may mean they form a wide triple star system.[8]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Microscopium |
Right ascension | 20h 41m 51.15925s[2] |
Declination | −32° 26′ 06.8283″[2] |
Apparent magnitude (V) | 11.0/11.1[3] |
Characteristics | |
Spectral type | M4 Ve[4] + M4.5e |
U−B color index | +0.91[5] |
B−V color index | +1.58[5] |
Variable type | Flare star |
Astrometry | |
Radial velocity (Rv) | 4.5[6] km/s |
Proper motion (μ) | RA: +270.45[2] mas/yr Dec.: –365.60[2] mas/yr |
Parallax (π) | 93.50 ± 3.67 mas[2] |
Distance | 35 ± 1 ly (10.7 ± 0.4 pc) |
Orbit[7] | |
Period (P) | 141.39 yr |
Semi-major axis (a) | 2.616″ |
Eccentricity (e) | 0.607 |
Inclination (i) | 148.4° |
Longitude of the node (Ω) | 82.6° |
Periastron epoch (T) | 2035.10 |
Argument of periastron (ω) (secondary) | 54.6° |
Details | |
AT Mic A | |
Mass | 0.27+0.04 −0.09[8] M☉ |
Radius | 0.41[9] R☉ |
Luminosity | 0.036[3] L☉ |
Temperature | 3,150[3] K |
Age | 12+8 −4[8] Myr |
AT Mic B | |
Mass | 0.25+0.04 −0.09[8] M☉ |
Radius | 0.37[9] R☉ |
Luminosity | 0.033[3] L☉ |
Temperature | 3150[3] K |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | A |
B |
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