V455 And
V515 And
AE Aqr
FO Aqr
V349 Aqr
XY Ari
V405 Aur
V647 Aur
HT Cam
MU Cam
DW Cnc
V709 Cas
V1025 Cen
V1033 Cas
TV Col
TX Col
UU Col
V2069 Cyg
V2306 Cyg
DO Dra
PQ Gem
V418 Gem
DQ Her
V1323 Her
V1460 Her
V1674 Her
EX Hya
NY Lup
V2400 Oph
V2731 Oph
V3037 Oph
V598 Peg
GK Per
AO Psc
HZ Pup
V667 Pup
WX Pyx
V1223 Sgr
V4743 Sgr
CC Scl
V1062 Tau
AX J1740.1
AX J1832.3
AX J1853.3
CTCV J2056
CXO J174954
IGR J04571
IGR J08390
IGR J15094
IGR J16500
IGR J16547
IGR J17014
IGR J17195
IGR J18151
IGR J18173
IGR J18308
IGR J19267
PBC J0927.8
PBC J1841.1
RX J1804
RX J2015
RX J2113
RX J2133
RX J2306
Swift J0717
Swift J1839
Swift J2006
Swift J2138

Full Catalog

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V2731 Ophiuchi = IGR J17303-0601 = 1RXS J173021.5-055933

Links to this object in VSX and in Swift BAT 157 month survey

A finding chart for V2731 Oph

SkyView image of V2731 Oph (see important notes).

  • Equatorial: 17h30m21.90s, -05d59m31.8s (Gaia)
  • Galactic: l= 17.93, b=+15.01
Finding Chart:
Gaensicke et al. (2005)
Optical: G=15.8 (Gaia); X-rays: 6.9x10-11 ergs cm-2s-1 (BAT 157m; 14-195 keV); 2.4x10-11 ergs cm-2s-1 (4XMM-DR11)
IP Credential:
***** (Ironclad): The spin period has been confirmed in multiple X-ray observations as well as in optical photometry, and the long orbital period is from ellipsoidal modulation and from optical spectroscopy.
  • Orbital: 0.64255 d = 15.421 hr = 55516 s, see in optical spectroscopy.
  • Spin: 0.00148148 d = 2.1333 min = 127.9999 s, seen in optical photometry,
  • Others:
1938 (1800-2119) pc (Gaia EDR3; parallax: 0.481+/-0.041 mas)


  1. Masetti et al. 2004 (optical identification)
  2. Stephen et al. 2005 (soft X-ray identification)
  3. Gaensicke et al. 2005 (optical identification, photometry & spectroscopy)
  4. Pandey et al. 2006 (radio)
  5. Barlow et al. 2006 (hard X-ray survey)
  6. de Martino 2007 (X-rays)
  7. Teichgraeber et al. 2007 (optical photometry)
  8. de Martino et al. 2008 (X-rays)
  9. Revnivtsev et al. 2008 (analysis of INTEGRAL sample)
  10. Landi et al. 2009 (X-rays)
  11. Brunschweiger et al. 2009 (X-rays)
  12. Butters et al. 2009 (optical photometry & polarimetry)
  13. Scaringi et al. 2010 (X-rays)
  14. Anzolin et al. 2010 (X-ray flickering)
  15. Yuasa et al. 2010 (X-ray spectroscopy)
  16. Pretorius & Mukai 2014 (space density)
  17. Hailey et al. 2016 (X-rays)
  18. Barrett et al. 2017 (radio)
  19. Schwope 2018 (space density)
  20. Suleimanov, Doroshenko & Werner 2019 (X-ray spectroscopy)
  21. Lopes de Oliveira & Mukai 2019 (X-rays)

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Please send your comments, suggestions etc. to Koji.Mukai@nasa.gov and/or Koji.Mukai@umbc.edu
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