AT Microscopii

AT Microscopii

An ultraviolet band light curve for AT Microscopii, adapted from Andrews (1990)[1]
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]
Distance35 ± 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
Mass0.27+0.04
−0.09[8] M☉
Radius0.41[9] R☉
Luminosity0.036[3] L☉
Temperature3,150[3] K
Age12+8
−4[8] Myr
AT Mic B
Mass0.25+0.04
−0.09[8] M☉
Radius0.37[9] R☉
Luminosity0.033[3] L☉
Temperature3150[3] K
Other designations
AT Mic, CD−32°16135, GJ 799, HD 196982, HIP 102141, SAO 212355, WDS J20452-3120BC[4]
Database references
SIMBADdata
ARICNSA
B

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]

  1. ^ Cite error: The named reference Andrews was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference van_Leeuwen_2007 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference McCarthyWhite2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Nicolet1978 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Torres2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference orb6 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Caballero2009 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference ISDB was invoked but never defined (see the help page).