V884 Her: an improved ephemeris [Observed: 2 sessions in 2018, 3 in 2017, 6 in 2016, 6 in 2015 ]
Photometric observations of the cataclysmic polar V884 Her are
presented. An improved ephemeris for the eclipses is obtained.
The asynchronous polar V1432 Aquilae and its path back to synchronism 
V1432 Aquilae is the only known eclipsing asynchronous polar. In this respect it is unique and therefore merits
our attention. We report the results of a 15-year campaign by the globally distributed Center for Backyard Astrophysics to observe V1432 Aql and investigate its return to synchronism. Originally knocked out of
synchrony by a nova explosion before observing records began, the magnetic white dwarf in V1432 Aql is
currently rotating slower than the orbital period but is gradually catching up. The fortuitously high inclination of
the binary orbit affords us the bonus of eclipses providing a regular clock against which these temporal changes
can be assessed. At the present rate, synchronism should be achieved around 2100. The continually changing trajectory of the accretion stream as it follows the magnetic field lines of the rotating white dwarf
produces a complex pattern of light emission which we have measured and documented, providing comprehensive
observational evidence against which physical models of the system can be tested.
V884 Her: a polar [Observed: 11, 19 Feb, 6, 12 Mar, 6 Apr, 27 May 2015]
The linear polarization of this cataclysmic polar is detected,
and the orbital minima are found to be way off from the 1993 ephemeris.
MR Ser: a polar cataclysmic [Observed: 16 April, 17, 18 July 2014]
Photometric observations of the polar cataclysmic MR Ser are presented and compared
with the ephemeris.
V1432 Aql: 2012 observations [Observed: 1 Jun, 18, 25, 30 Jul, 7, 17 Aug, 14 Sep, 14, 15, 19 Nov 2012]
New observations of this asynchronous polar confirm the 2007-2011
V1432 Aql: 5 more years of observations [Observed: 28 sessions in 2007-2011.]
Photometry observations of the asynchronous polar V1432 Aql are presented.
Ephemerides for the orbital motion and for the spin are derived and are compared
with previous ephemerides. For the spin, there is some evidence for a secondary
derivative of the period.
SDSS J015543.40+002807.2 (FL Cet) low state [Observed: 28 Sep, 15, 16, 17, 18 Nov 2011]
This cataclysmic polar with deep, narrow eclipses has dropped by 2 magnitudes since September 2011.
SDSS J015543.40+002807.2 (FL Cet): a cataclysmic polar with deep eclipses [Observed: 6, 8 Oct 2010]
Light curves for this cataclysmic polar with deep, narrow eclipses
are presented. The eclipse times are in agreement with the 2006 ephemeris.
V1432 Aql time keeping [Observed: 28 June, 22 July, 6, 30 August 2008]
Light curves for this asynchronous polar are presented. They show
the eclipses and the spin modulation. They are compared with ephemerides.
VV Pup: polar variations [Observed: 13 Jan, 2, 15, 20 Feb, 30 Nov 2007]
This cataclysmic polar was observed in low state at the beginning
of 2007. It was back to its usual level in November.
V1309 Ori: an eclipsing polar [Observed: 26 Dec 2006, 15 Feb, 7 Nov 2007]
A phase plot of this eclipsing polar is presented. I try to model it
V1432 Aql: an asynchronous polar [Observed: 7, 12, 13, 14, 15 July, 5, 18 Aug, 5, 15 Sept 2007]
Light curves for this magnetic cataclysmic system are presented.
They show the eclipses and the spin modulation.
VV Pup the polar [Observed: 25, 31 Jan, 1 Feb 2006]
Light curves for this cataclysmic polar are presented.