National Aeronautics and Space Administration

IPs

V455 And
V515 And
AE Aqr
FO Aqr
V349 Aqr
XY Ari
V405 Aur
V647 Aur
HT Cam
MU Cam
DW Cnc
BG CMi
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
EI UMa
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
LAMOST 0240
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

Position:

• Equatorial: 20^h07^m36.58^s, +17^d42^m14.3^s (Gaia)
• Galactic: l=57.54, b=-7.93

Finding Chart:

?

Brightness:

Optical: G=15.2 (Gaia); X-rays: 1.2x10^-11 ergs cm^-2s^-1 (4XMM-DR11)

IP Credential:

*** (Probable LLIP): There are conflicting indications, but the stability of the 27.87 s period is best interpreted as the spin period of a magnetic white dwarf.

Periods:

• Orbital: 0.056688 d = 1.3605 hr = 4897.8 s
• Spin ? 27.87 s
• Others: 28.97 s

Inclination:

?

Distance:

45.18 (45.13-45.25) pc (Gaia EDR3; parallax: 22.1035+/-0.0304 mas)

The reference list below is incomplete.

References

1. Kraft 1964 (optical spectroscopy)
2. Warner & Nather 1972 (optical photometry)
3. Robinson, Nather & Patterson 1978 (optical photometry)
4. Fabian et al. 1978 (Eclipse analysis)
5. Crampton, Hutchings & Cowley 1979 (optical spectroscopy)
6. Brosch, Leibowitz & Mazeh 1980 (optical spectroscopy during outburst)
7. Gilliland & Kemper 1980 (optical spectroscopy during outburst)
8. Fabian et al. 1980 (UV spectroscopy during outburst)
9. Patterson 1980 (optical photometry)
10. Patterson et al. 1981 (optical photomery during outburst)
11. Leibowitz & Mazeh 1981 (optical spectroscopy during outburst)
12. Willams 1983 (optical spectroscopy and finding charts)
13. Gilliland, Kemper & Suntzeff 1986 (optical spectroscopy)
14. Cropper 1986 (optical polarimetry)
15. Eracleous, Patterson & Halpern 1991 (X-ray timing)
16. Eracleous, Halpern & Patterson 1991 (X-ray spectroscopy)
17. Stockman et al. 1992 (optical polarimetry)
18. Mukai & Shiokawa 1993 (X-rays)
19. Richman 1996 (X-rays)
20. Skidmore et al. 1997 (optical photometry)
21. Welsh et al. 1997 (ultraviolet spectrophotometry)
22. Patterson et al. 1998 (optical photometry and X-rays)
23. Lasota, Kuulkers & Charles 1999 (outburst model with a propeller)
24. Skidmore et al. 1999 (ultraviolet spectrophotometry)
25. Littlefair et al. 2000 (infrared spectroscopy)
26. Dhillon et al. 2000 (infrared spectroscopy)
27. Skidmore et al. 2000 (optical & infrared spectroscopy)
28. Mason et al. 2000 (optical & IR spectroscopy)
29. Ishioka et al. 2002 (optical photometry)
30. Patterson et al. 2002 (optical photometry)
31. Mennickent & Diaz 2002 (infrared spectroscopy)
32. Skidmore et al. 2002 (IR photometry)
33. Knigge et al. 2002 (UV photometry)
34. Long et al. 2003 (UV spectroscopy)
35. Matthews et al. 2007 (accretion disk with a magnetic white dwarf)
36. Steeghs et al. 2007 (UV spectroscopy)
37. Kuulkers et al. 2011 (optical photometry)
38. Harrison et al. 2013 (infrared)
39. Nucita et al. 2014 (X-rays)
40. Han et al. 2017 (eclipse timings)
41. Campana et al. 2018 (optical & multiwavelength)
42. Patterson et al. 2018 (eclipse timings)
43. Georganti et al. 2022 (UV spectroscopy)