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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HT Camelopardaris = RX J0757.0+6306

Link to this object in VSX

A finding chart for HT Cam

SkyView image of HT Cam (see important notes).

  • Equatorial: 07h57m01.34s, +63d06m02.0s (Gaia)
  • Galactic: l=153.48, b=+31.35
Finding Chart:
Tovmassian et al (1998)
Optical: G=16.6 (Gaia); X-rays: 5.6x10-12 ergs cm-2s-1 (4XMM-DR11)
IP Credential:
***** (Ironclad LLIP) The spin period is confirmed in multiple X-ray observations and in optical photometry, while the orbital period is measured from optical spectroscopy.
  • Orbital: 0.059712 d = 1.43309 hr = 5159.1 s, see in optical spectroscopy.
    HJD = 2450842.6636(7) + 0.059712(1)E
    (Kemp et al 2002) from H-alpha radial velocity.
  • Spin: 0.005961333 d = 8.584320 min = 515.0592 s, seen in optical photometry.
    HJD = 2450798.7743(2) + 0.005961333(3)E
    (Kemp et al 2002) for photometric spin maxima.
  • Others:
359.6 (354.1-366.1) pc (Gaia EDR3; parallax: 2.750+/-0.047 mas)


  1. Tovmassian et al. 1998 (ROSAT discovery and optical follow-up)
  2. Jiang et al. 2000 (optical spectroscopy)
  3. Ishioka et al. 2002 (optical photometry)
  4. Kemp et al. 2002 (optical photometr & spectroscopy)
  5. Evans & Hellier 2005 (X-ray timing)
  6. de Martino et al. 2005 (X-rays and optical photometry)
  7. Evans & Hellier 2007 (X-rays - soft component search)
  8. de Martino 2007 (X-rays)
  9. Brunschweiger et al. 2009 (X-rays)
  10. Anzolin et al. 2010 (X-ray flickering)
  11. Hameury & Lasota 2017 (disk instability model for IPs)
  12. Barrett et al. 2017 (radio)
  13. Campana et al. 2018 (optical & multiwavelength)

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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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