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Name
  AT Mic  
AAVSO UID
000-BCW-378 (3 observations)  
Constellation
Microscopium Sequence
J2000.0
20 41 51.16 -32 26 06.8  (310.46317 -32.43522) Search nearby
B1950.0 20 38 43.76 -32 36 33.8
Proper motion
RA: 270.45 mas/yDec: -365.60 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 11.141 -36.343
Other names

(Internal only)
1RXS J204151.2-322604 1SWASP J204151.14-322610.2 AAVSO 2035-32
ASAS J204151-3226.0 ASAS J204151-3226.1 CD-32 16135
CPD-32 6181 GJ 799.0 AB GJ 799A/B
HD 196982 HIP 102141 SAO 212355
X 20387-326    
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Variability type
BY+BY+UV
Spectral type M4.5Ve+M4.5Ve
Mag. range
10.29 - 10.40 V
Discoverer --
Epoch
--
Outburst --
Period 1.19 d
Rise/eclipse dur. --
Remarks
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1 Hinzel, David H. Part of a hierarchical triple system with AU Mic. Both components show rotational variability, one with a period of 1.19 d. and the other one with a period of 0.78 d. Orbital period = 209 y. Flares probably arise from one component only.
2 GCVS Team VB (A 10.83m V, M 4.5Ve; B 10.9m V, M 4.5Ve; a = 6.40", P = 675 yr, e = 0.60 [R.H.Wilson, MN 182, 345, 1978.]. mu alpha = + 0.0216s, mu delta = -0.331" (mu, Vr, pi - common with AU Mic). Unusually high freguency of flares allows to suppose that both components are variable. The range of combined brightness variation of the system is given in the Table.
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References
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1 Messina, S.; et al., 2016, The triple system AT Mic AB +AU Mic in the B
Pictoris Association
2016Ap&SS.361..291M
2 M. Kiraga, 2012, Acta Astronomica 62, 67 2012AcA....62...67K
3 M. Kiraga, K. Stepien, 2007, Acta Astronomica 57, 149 2007AcA....57..149K
4 W.E.Kunkel, IBVS N442, 1970. 1970IBVS..442....1K
5 F.M.Bateson, A.F.Jones, I.Stranson, Charts for Southern Variables, ser. 5,
1968.
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 5.81H = 5.20K = 4.94J - K = 0.86
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Revision History
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4 Hinzel, David H. 2017-08-02 16:19 UTC Spectral type and period from 2016Ap&SS.361..291M. Range from ASAS-3 and APASS data.
3 Admin, VSX 2012-04-19 21:08 UTC Update from [2012AcA....62...67K].
2 Admin, VSX 2009-04-06 20:45 UTC Update from [2007AcA....57..149K ].
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.