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  V1223 Sgr  
000-BCX-045 (12633 observations)  
Sagittarius Sequence
18 55 02.31 -31 09 49.5  (283.75963 -31.16375) Search nearby
B1950.0 18 51 49.21 -31 13 39.9
Proper motion
RA: 2.2 +/- 1.3 mas/yDec: -22.4 +/- 1.3 mas/ySource: UCAC4
Galactic coord. 4.958 -14.355
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1RXS J185502.1-310951 2MASS J18550231-3109495 3A 1851-312
AAVSO 1848-31 Downes V1223 Sgr X 18518-312
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Variability type
Spectral type pec(e+cont)
Mag. range
12.3 - <16.8 V
Discoverer --
Outburst --
Period 0.140244 d  (3.3659 h)
Rise/eclipse dur. --
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 Otero, Sebastian Alberto Short duration flares. UG?
2 2009arXiv0910.0954S White dwarf spin period = 746 seconds.
3 GCVS Team As a rule has a persistent high state; five drops by two to more than three magnitudes have been registered and a twelve year interval of irregular variations at intermediate magnitudes. According to [B.Warner, M.Cropper, MN 206, N2, 261, 1984.] there are slow variations in brightness by 0.15m on a time scale of ~1 day. They are superimposed by variations with the orbital period P orb (Max = 2444749.9866 + 0.140239d*E) and with amplitude up to 0.15m. These variations in their turn are superimposed by the others: with P = 794.38s and the amplitude from 0.03m up to 0.15m (Max = 2444750.00404 + 0.009194215d*E and (sometimes) with P = 849.8s and a twice smaller amplitude (Max = 2444750.00350 + 0.00983588d*E). Besides there are rapid brightness variations on time scales 10 - 100s by 0.10m - 0.20m, and high frequency flickering by 0.05m. According to [W.R.Penning, ApJ 289, 300, 1985.], the period of X-ray pulses associated with the rotation of the compact object is 12.5 minutes.
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Click reference title/citation to view in new window. Roll over index number to view submission details.
1 S. Scaringi et al., 2009, arXiv:0910.0954v1 [astro-ph.GA] 2009arXiv0910.0954S
2 R.A.Downes, 2001, PASP 113, 764 (2006 archival) 2005JAD....11....2D
3 R.A.Downes, 2001, PASP 113, 764 2001PASP..113..764D
4 E.P.Belseren, BAAS 13, N2, 524, 1981. 1981BAAS...13Q.524B
5 J.E.Steiner, D.A.Schwartz, F.J. Jablonski, I.C.Busko, M.G.Watson, J.P.Pye,
I.M.McHardy, ApJ 249, L 21, 1981.
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Revision History
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4 Otero, Sebastian Alberto 2011-05-17 21:45 UTC Primary record creation. Type and range from Downes (2001).
3 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
2 Admin, VSX 2009-10-08 22:29 UTC Orbital period from [2009arXiv0910.0954S].
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.