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Name
  V3990 Sgr  
AAVSO UID
000-BFJ-305 (No observations)  
Constellation
Sagittarius Sequence
J2000.0
18 00 17.04 -28 55 24.1  (270.07099 -28.92337) Search nearby
B1950.0 17 57 06.39 -28 55 18.4
Galactic coord. 1.641 -2.757
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
2MASS J18001704-2855241 ASASSN-V J180017.04-285524.1 OGLE BLG206.2.159445
OGLE BUL-SC21 V3198 OGLE BUL-SC21 V3216 OGLE BUL_SC21_323748
OGLE II BUL_SC21_323748 OGLE-BLG-LPV-169837 OGLE-III BLG206.2.159445
OGLE-IV BLG505.17.159634 OGLEII DIA BUL-SC21 V3198  
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Variability type
M
Spectral type --
Mag. range
11.4 - 14.5 Ic
Discoverer --
Epoch
23 May 1998 (HJD 2450957.0) Ephemeris
Outburst --
Period 305.2 d
Rise/eclipse dur. 42%  (128 d)
Remarks
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1 Otero, Sebastian Alberto J-K= 1.75. Ic magnitudes from OGLE-III (0.40 mag. fainter than the OGLE-I zero point). Crowded area. The variable has mag. 16-<22 in V so it will be invisible for most observers. Two nearby stars: 2MASS J18001715-2855329 (V= 16.8; 9" to the S) and 2MASS J18001789-2855219 (V= 15.6; 11.4" to the E).
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References
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1 Iwanek, P.; et al., 2022, The OGLE Collection of Variable Stars: Nearly
66,000 Mira Stars in the Milky Way		 2022ApJS..260...46I
2 I. Soszynski, A. Udalski, M.K. Szymanski et al., 2013, Acta Astronomica 63,
21 (online V data)		 2013arXiv1304.2787S
3 I. Soszynski, A. Udalski, M.K. Szymanski et al., 2013, Acta Astronomica 63,
21 (online I data)		 2013arXiv1304.2787S
4 I. Soszynski, A. Udalski, M.K. Szymanski et al., 2013, Acta Astronomica 63,
21 (Chart)		 2013arXiv1304.2787S
5 I. Soszynski, A. Udalski, M.K. Szymanski et al., 2013, Acta Astronomica 63,
21		 2013arXiv1304.2787S
6 Soszynski, I.; et al., 2013, The Optical Gravitational Lensing Experiment.
The OGLE-III Catalog of Variable Stars. XV. Long-Period Variables in the
Galactic Bulge		 2013AcA....63...21S
7 N.Matsunaga, H.Fukushi, Y.Nakada, MNRAS 364, 117, 2005. 2005MNRAS.364..117M
8 Szymanski, 2005, Acta Astron. 55, 43 (online data) 2005AcA....55...43S
9 M.K. Szymanski, 2005, Acta Astron. 55, 43 (online data) 2005AcA....55...43S
10 Groenewegen M.A.T., A+A 443, 143, 2005. 2005A&A...443..143G
11 T.L.Evans, MN 174, 169, 1976. 1976MNRAS.174..169E
External Links
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Location    Go   
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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 = 8.96H = 7.89K = 7.21J - K = 1.75
AllWISE W1 = 6.36W2 = 6.56W3 = 5.05W4 = 3.88W1 - W2 = -0.20W3 - W4 = 1.17
Images
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Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2014-01-21 01:30 UTC Phase plot with OGLE-III data.
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Revision History
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6 Otero, Sebastian Alberto 2023-02-27 20:29 UTC Period from 2022ApJS..260...46I. Gaia DR3 position.
5 Otero, Sebastian Alberto 2019-09-29 00:10 UTC Period from 2013AcA....63...21S.
4 Otero, Sebastian Alberto 2014-01-21 01:30 UTC Primary record creation. Type, period, epoch, range and rise duration from OGLE-III data. 2MASS position.
3 Admin, VSX 2013-04-17 23:52 UTC Update from [2013arXiv1304.2787S].
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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