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.
FO Aqr time keeping [Observed: 49 sessions from 2004 to 2015]
Twelve seasons, from 2004 to 2015, of photometric monitoring of
the intermediate polar FO Aqr are presented and are compared with previous
observations. The ambiguities in the cycle counting can be lifted and
a new O-C diagram, spanning 34 y,r is presented, along with new ephemerides.
FO Aqr 2016 low state and recovery [Observed: 10 Jul, 31 Oct, 6, 8 Nov, 26 Dec 2015, 28 Jun, 3, 9, 18, 28]
In 2016, the intermediate polar FO Aqr has been observed in an
unusual low state and slowly recovering. The O-C are compared with those from my previous observations.
BG CMi time keeping [Observed: 2005-2016]
Twelve seasons, from 2005 to 2016, of photometric monitoring of the intermediate polar BG CMi are presented and are compared with previous observations. The spin up of the white dwarf is found to have undergone a major change between 1996 and 2005. There is also some evidence for sideband signals.
is also some evidence for sideband signals.
Occultation by Lorraine [Observed: 2 Dec 2015]
The minor planet 1114 Lorraine was observed occulting a 10.7 mag
star. The duration of the occultation was 3.4±0.7s.
Occultation by 27 Euterpe [Observed: 2 Nov 2015]
The minor planet 27 Euterpe was observed occulting a 12.1 mag star:
the duration of the event was 23.6±1.7s.
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.
V404 Cyg polarization [Observed: 26, 28 June 2015 ]
Time series, through polarization filters, of the binary system
with a black hole V404 Cyg, during its June 2015 outburst, are presented.
NSV 02026 [Observed: 10, 11, 12, 19 Feb, 5, 12 Mar 2015]
Photometric observations of NSV 02026, a candidate UGSU, are presented.
Relativity: a quick introduction 
A quick introduction to Special Relativity with a derivation of E=mc2.