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.

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.

VY Cet: a contact binary in a ternary system [Observed: 26 Dec 2006, 3 Nov 2007, 30 Jan 2009, 31 Oct 2014]
Time series of this contact binary in a ternary system are presented. 3 ToMs are measured along with the B-V and V-Rc colors.

AO Psc time keeping [Observed: 74 sessions from 2004 to 2014]
Eleven seasons, from 2004 to 2014, of photometric monitoring of the intermediate polar AO Psc are presented and are compared with previous observations. The spin up of the white dwarf is found to be slowing down. The amplitudes of the modulated and non-modulated components of the brightness are found to have undergone a major change in 2007.

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.

VZ Lib: a contact binary in a ternary system [Observed: 2007-2009, 14 sessions]
Time series of this eclipsing contact binary are reported and times of minima (ToM) of the eclipses are measured. This system has a third component. From the O-C analysis of the observed ToM and of those in the literature, the orbital parameters of the third body can be derived: the orbital period is 34.8 yr and the inclination is 11.5 °.

UX Mon: time keeping and modelling of a binary [Observed: 13 Dec 2007, 11-16, 18 Feb, 8, 13, 14 March, 1, 4, 25, 29]
Time series of this eclipsing binary system with extra variability are presented. The O-C analysis suggests the presence of a third star. The observations are modelled with BinaryMaker3 and parameters of the system are derived.

Data processing []
A partial list of what I do to process data for photometry.

WX Eri / V1241 Tau: an eclipsing semi-detached binary system [Observed: 15 Oct, 29, 30 Nov, 13, 16 Dec 2007, 1, 23 Jan 2008]
Light curves of this eclipsing, semi-detached binary system with a period of 0.8d are presented and are modeled with BinaryMaker3. No evidence for a pulsating star in this system is found.

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 with BinaryMaker3.

EH Lib: 2007 follow up [Observed: 24 Apr, 7, 12 July 2007]
Time-series of this DSCT pulsating star with a period of 2.1h are presented and compared with 2004-2005 observations.

Occultation by 40 Harmonia [Observed: 12 Nov 2007]
The minor planet 40 Harmonia was observed occulting a 10.6 mag star: the size of the shadow flying over my location was 68+/-8km.

Occultation by asteroid 329 Svea [Observed: 7 Nov 2007]
The minor planet 329 Svea was observed occulting a 11.54 mag star: the size of the shadow flying over my location was 68.8km.

KU Her: a slow irregular variable [Observed: 12, 13, 14, 15, 19 July, 5, 18 Aug, 5, 6, 12, 15, 19, 20 Sept,]
Multicolor photometry of this irregular variable star are presented.

ASAS1826+12: the eclipsing Cepheid [Observed: 7, 12, 13, 14, 15, 17, 19 July, 5, 18 Aug, 5, 6, 12, 15, 19,]
Multicolor photometric measurements of this Cepheid in an eclipsing binary system (the only known one in our galaxy) are presented.

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.

TX Mon: a Cepheid radius variations [Observed: 23 sessions from 29 Mar 2006 to 11 Mar 2007]
B,V photometry measurements of this Cepheid are presented. The distance, temperature and radius of this pulsating star are computed.

SZ Mon, the double pulsator [Observed: 35 sessions from 23 Dec 2005 to 11 Mar 2007]
Photometry of this pulsating supergiant star (33d period) are presented. The magnitudes are compared with published observations. The measurements are also corrected for a nearby star. Variations of the color, temperature, radius and luminosity are inferred.

SZ Mon: very low resolution spectroscopy (experiment) [Observed: 16, 30 Oct, 24, 28 Dec 2006, 12, 13 Jan 2007]
I observed this pulsating supergiant with a slitless 100groves/mm transmission grating, trying to see the variations of the spectra as a function of the pulsational phase.

NGC5584 and SN2007af [Observed: 11 Mar 2007]
An image of the spiral galaxy NGC5584 with its bright supernova SN2007af obtained with a 20cm telescope is presented.

Light-travel time effects in binary systems []
The light-travel time effects for a pulsating star (or a close binary) in a binary system are calculated.

KZ Hya: a pulsating binary (improved) [Observed: 9 Feb, 11, 14 March, 19 Apr 2007]
This pulsating star is in a binary system with an 8-yr orbital period. The times of maximum are compared with an improved ephemeris and the parameters of the binary are derived.

SDSS J040714.78-064425.1: an eclipsing cataclysmic [Observed: 30 Nov, 13, 14, 22, 23, 24, 25 Dec 2006, 12, 13 Jan 2007]
Time series for this deeply eclipsing cataclysmic system are presented.

Telescope and camera configuration A7202 []

Transformations for differential photometry (with weights) []
An introduction to transformation coefficients and equations for differential photometry. The transformation coefficients are derived from the weighted averages and the weighted standard deviations of several measurements.

Transformation coefficients (with weights): B, V measurements [Observed: 5 Jan 2005, 24 Dec 2006, 12 Jan, 9, 15, 20 Feb, 11, 14 March,]
The transformation coefficients for my telescope and camera and B,V filters are measured and computed from weighted averages and weighted standard deviations.

Transformation coefficients (with weights): V, Rc measurements [Observed: 7 Jan 2005, 24 Dec 2006, 12 Jan, 19 July, 5 Aug, 5, 6, 12,]
The transformation coefficients for my telescope and camera and V,Rc filters are measured and computed from weighted averages and weighted standard deviations.

Transformation coefficients (with weights): V,Ic measurements [Observed: 7 Jan 2005, 5, 6, 12, 15 Sept 2007]
The transformation coefficients for my telescope and camera and V,Ic filters are measured and computed from weighted averages and weighted standard deviations.

Transformations for differential photometry []
An introduction to transformation coefficients and equations for differential photometry.

Transformation coefficients: B, V measurements [Observed: 5 Jan 2005, 24 Dec 2006, 12 Jan, 9, 15, 20 Feb, 11, 14 March,]
The transformation coefficients for my telescope and camera and B,V filters are measured.

Transformation coefficients: V, Rc measurements [Observed: 24 Dec 2006, 12 Jan, 19 July, 5 Aug, 5, 6, 12, 15 Sept 2007]
The transformation coefficients for my telescope and camera and V,Rc filters are measured.

Transformation coefficients: V,Ic measurements [Observed: 5, 6, 12, 15 Sept 2007]
The transformation coefficients for my telescope and camera and V,Ic filters are measured.

Spectroscopy with a StarAnalyzer [13 Feb 2007]