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

Related Systems

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V2306 Cygni = WGA J1958.2+3232

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

A finding chart for V2306 Cyg

SkyView image of V2306 Cyg (see important notes).

  • Equatorial: 19h58m14.47s, +32d32m41.9s (Gaia)
  • Galactic: l=69.05, b=+1.70
Finding Chart:
Israel et al (1999) (their star B).
Optical: G=15.7 (Gaia); X-rays: 1.4x10-11 ergs cm-2s-1 (BAT 157m; 14-195 keV), 1.5x10-11 ergs cm-2s-1 (2SXPS)
IP Credential:
***** (Ironclad) Despite some initial confusion about the nature of the object and the true spin period, the IP nature of this object has been established beyond doubt using optical spectroscopy and photometry, and X-ray observations.
  • Orbital: 0.1821454 d = 4.371490 h = 15737.36 s seen in optical photometry and spectroscopy.
    (Thorstensen et al. 2017)
  • Spin: 0.0169754574(34) d = 24.4446587 min = 1466.67952 s from X-ray and optical photometry, in which half the spin period (733.33 s) is the dominant period.
  • Others: Beat period of 1587.24 s is present in optical photometry.
1253 (1211-1304) pc (Gaia EDR3; parallax: 0.771+/-0.028 mas)


  1. Israel et al. 1998 (X-ray timing)
  2. Israel et al. 1999 (optical identification)
  3. Negueruela, Reig & Clark 2000 (optical spectroscopy)
  4. Uslenghi et al. 2000 (optical photometry)
  5. Zharikov et al. 2001 (optical photometry & spectroscopy)
  6. Uslenghi et al. 2001 (optical polarimetry)
  7. Norton et al. 2002 (optical photometry with archival X-ray data)
  8. Zharikov, Tovmassian & Echevarria 2002 (optical spectroscopy & photometry)
  9. Parker, Norton & Mukai 2005 (X-ray timing)
  10. Brunschweiger et al. 2009 (X-rays)
  11. Butters et al. 2009 (optical photometry & polarimetry)
  12. Galis et al. 2010 (X-rays)
  13. Petrik et al. 2015 (optical photometry)
  14. Breus et al. 2015 (optical photometry)
  15. Barrett et al. 2017 (radio)
  16. Thorstensen et al. 2017 (orbital period)
  17. Suleimanov, Doroshenko & Werner 2019 (X-ray spectroscopy)
  18. Breus, Petrik & Zola 2019 (optical photometry)

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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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