Observed: 1 Feb, 29 March, 3 Apr 2006
2 Feb 2006
Updated 30 March, 4 Apr 2006
Observations of this faint, large amplitude cataclysmic star
with a small telescope are presented.
RX J1039 is a catasclysmic variable, that is a binary star with an accreting white dwarf.
This is a ROSAT X-ray source. According to Woudt & Warner (2003), the orbital
period is 1.574h and the white dwarf is magnetic with a spin period of 24.07mn
(an intermediate polar).
It is also a CBA
target for Jan-Apr 2006.
The observations were carried out with a 203mm f/6.3 SC telescope, a
Clear filter and a SBIG ST7E camera (KAF401E CCD).
|Session||Number of measurements
|1 Feb 2006||53
|29 March 2006||26
|3 Apr 2006||68
Each exposure is 200s (a few 60s images at the beginning of each session).
The comparison star is GSC 4919-01359 with an assumed unfiltered magnitude
of 13.8. The check star is an anonymous star at RA=10h39mn47.78s DEC=-5°07'32.4"
with a measured average magnitude of 17.19 and a standard deviation of
The light curves:
Red: RXJ1039, Blue: the check star shifted by +2 mag. The error bars
are +/- the 1 sigma statistical uncertainties.
Interrupted by haze and clouds.
Orbital phase plots
The observations from Session 1 Feb 2006 may be folded with the orbital
ephemeris of Woudt & Warner (2003). I need an orbital period of 0.065596
day, within the uncertainties of the ephemeris, for the maximum to be
around phase 0 (therefore my measurements may be used to improve the ephemeris):
Woudt P.A., Warner B. (2003) MNRAS 339 731 [arXiv:astro-ph/0210565]
Telescope and camera configuration.
Computer and software configuration.