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Name
  V0821 Ara  
AAVSO UID
000-BDG-717 (1017 observations)  
Constellation
Ara Sequence
J2000.0
17 02 49.40 -48 47 23.0  (255.70583 -48.78972) Search nearby
B1950.0 16 59 01.99 -48 43 07.5
Galactic coord. 338.939 -4.326
Other names

(Internal only)
1RXS J170248.5-484719 2MASS J17024936-4847228 4U 1658-48
AAVSO_DES 1655-48 GX 339-04 X 16589-487
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Variability type
XFND
Spectral type pec(e)
Mag. range
16.2 - 21.0: B
Discoverer --
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Likely a black hole binary.
2 GCVS Team 4U 1658-48. Unusua1 X-ray system. Quasiperiodic optical variations (P ~20s) with total amplitude 40 percent, abrupt bursts on ~20 ms time scale leading to two-fold flux increase and light changes by 6m during less than two months were observed [C.Motch, S.A.Ilovaisky, IAU Circ N3609, 1981.]. Lx/Lopt = 3.
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References
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1 Corral-Santana, J. M.; Casares, J.; Muñoz-Darias, T.; et al., 2016,
WATCHDOG: A Comprehensive All-sky Database of Galactic Black Hole X-ray
Binaries		 2016ApJS..222...15T
2 Rapid optical and X-ray timing observations of GX339-4: multicomponent
optical variability in the low/hard state		 2010MNRAS.407.2166G
3 J.E.Grindlay, ApJ 232, L33, 1979. 1979ApJ...232L..33G
4 R.Doxsey, J.Grindlay, R.Griffiths, H.Bradt, M.Johnston, R.Leach,
D.Schwartz, J.Schwarz, ApJ 228, L 67, 1979.		 1979ApJ...228L..67D
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Supporting Documents
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Revision History
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4 Otero, Sebastian Alberto 2018-02-28 02:56 UTC Type from 2016ApJS..222...15T. UCAC4 position.
3 Otero, Sebastian Alberto 2011-05-25 04:26 UTC Primary record creation. Type from reference. Spectral type and orbital period from Ritter and Kolb (2010, 2003A&A...404..301R). UCAC3 position.
2 Admin, VSX 2010-01-05 04:43 UTC Update from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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