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Name
  V3721 Oph  
AAVSO UID
000-BMP-599 (480723 observations)  
Constellation
Ophiuchus Sequence
J2000.0
18 20 21.94 +07 11 07.3  (275.09142 +7.18536) Search nearby
B1950.0 18 17 56.60 +07 09 43.6
Galactic coord. 35.854 +10.159
Other names

(Internal only)
1RXS J182022.9+071125 2MASS J18202194+0711073 2SXPS 158802
ASASSN-18ey AT 2018amn ATO J275.0914+07.1853
CWISE J182021.93+071107.2 DASCH_J182021.7+071111 GALEX J182021.9+071107
GSC2.3 N1QV010706 Gaia18asi MAXI J1820+070
PGIR19auj PNV J18202184+0711091 PSO J182021.941+071107.257
URAT1 486-270102 USNO-A2.0 0900-12487311 USNO-B1.0 0971-0414244
WISE J182021.94+071107.2 WISEA J182021.94+071107.2 XPM 194-0496404
ZTF18abjkrup    
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Variability type
LMXB/BHXB:/XN
Spectral type --
Mag. range
11.7 - 18.8 V
Discoverer ASAS-SN
Epoch
--
Outburst --
Period 0.1417 d  (3.40 h)
Rise/eclipse dur. --
Remarks
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1 Schmeer, Patrick Gaia EDR3 parallax 0.369 ± 0.078 mas (distance 2.8 ± 0.6 kpc).
2 Schmeer, Patrick Two previous outbursts in DASCH data: 1898 October 17 (HJD 2414580.48222), pmag. 12.7; 1934 July 13 (HJD 2427631.60671); pmag. 14.0 (re-calibrated photographic "B" magnitudes and estimated outburst-recurrence time of 40 years from 2019ATel13066....1K).
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References
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1 M. C. Baglio; D. M. Russell; P. Saikia; et al., 2021, ATel #14492 2021ATel14492....1B
2 E. V. Kazarovets; N. N. Samus; O. V. Durlevich; et al., 2019, The 82nd
Name-List of Variable Stars. Part II – RA 18h to 20h and Novae		 2019PZ.....39....3K
3 N. Kojiguchi; T. Kato; K. Isogai; et al., 2019, ATel #13066 2019ATel13066....1K
4 M. Hankins; K. De; M. M. Kasliwal; et al., 2019, ATel #13044 2019ATel13044....1H
5 M. Richmond, 2018, ATel #11596 2018ATel11596....1R
6 C. Littlefield, 2018, ATel #11421 2018ATel11421....1L
7 M. C. Baglio; D. M. Russell; F. Lewis, 2018, ATel #11418 2018ATel11418....1B
8 D. Denisenko, 2018, ATel #11400 2018ATel11400....1D
9 T. Kawamuro; et al., 2018, ATel #11399 2018ATel11399....1K
10 Transient Name Server, 2018 (online data) --
11 Gaia Alerts, 2018 (online data) --
12 ASAS-SN Transients (Shappee et al., 2014) 2014ApJ...788...48S
13 ZTF observations (Lasair online data) --
14 DASCH DR6 (online data) --
External Links
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Images
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Supporting Documents
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Revision History
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12 Schmeer, Patrick 2021-04-11 15:24 UTC ZTF transient and PGIR designations and references added.
11 Schmeer, Patrick 2021-03-29 21:52 UTC Minimum magnitude from 2021ATel14492....1B. Gaia EDR3 position.
10 Schmeer, Patrick 2019-10-31 23:52 UTC Primary name from 2019PZ.....39....3K.
9 Schmeer, Patrick 2019-03-13 11:20 UTC Remark and references added.
8 Schmeer, Patrick 2019-03-12 14:36 UTC Gaia Alerts reference added.
7 Otero, Sebastian Alberto 2018-05-03 04:27 UTC Period from 2018ATel11596....1R.
6 Otero, Sebastian Alberto 2018-04-25 02:51 UTC Maximum magnitude from AAVSO data.
5 Otero, Sebastian Alberto 2018-03-28 08:54 UTC Maximum magnitude from AAVSO data.
4 Otero, Sebastian Alberto 2018-03-15 22:39 UTC Maximum magnitude from 2018ATel11421....1L. Approximate minimum magnitude derived from Gaia DR1 and Pan-STARRS1.
3 Otero, Sebastian Alberto 2018-03-14 22:24 UTC Type and range from 2018ATel11418....1B.
2 Schmeer, Patrick 2018-03-12 11:26 UTC Maximum magnitude from 2018ATel11400....1D. Type from 2018ATel11399....1K.
1 Otero, Sebastian Alberto 2018-03-08 04:46 UTC Minimum magnitude derived from Pan-STARRS1. PPMXL position.

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