Title:
CCD Minima for Selected Eclipsing Binaries in 2005

Author(s):
	Robert H. Nelson

Affiliation:
	1393 Garvin Street, Prince George, BC, Canada, V2M 3Z1 
	e-mail: bob.nelson@shaw.ca

Observatory and Telescope:
Sylvester Robotic Observatory (SRO):  33 cm f/4.5 Newtonian on Paramount GT-1100s mount

Detector (CCD: camera, chip, pixel size, field of view; etc.):
	SBIG ST-7e, Kodak KAF-0401E, 9 m x 9 m, FOV 15.8 x 10.5 
	SBIG ST-9, KAF-0261E, 20 m x 20 m, FOV 11.9 x 11.9 *
	SBIG ST-7XE, Kodak KAF-0402ME, 9 m x 9 m, FOV 15.8 x 10.5
All cameras were cooled to -10 < T < -30 C
* With x2 tele-extender lens

Method of data reduction:
	Aperture photometry using MIRA Pro 7, by Axiom Research

Method of minimum determination:
	Digital tracing paper method, bisection of chords, curve fitting, and (occasionally) Kwee and van Woerden (1956)

Table I -- Observed Stars:  (Deleted)

StarA&GCVS&RA (2000)&Dec (2000)&Comparison\\
Name&Type&hh.mmss&dd.mmss&Star\\
BF Aur&EB&5.0504&41.1719&GSC 2899-0175\\
V776 Cas&??&1.5323&70.0223&GSC 4314-1746\\
SU Cep&EB/KE&21.4640&57.1737&GSC 3976-1121\\
EG Cep&EB&20.1557&76.4836&GSC 4585-0413\\
XZ CMi&EA&7.5407&3.3920&GSC 0185-1603\\
RW Com&EW/KW&12.3300&26.4259&GSC 1991-1659\\
EK Com&EW&12.5122&27.1347&GSC 1995-2319\\
BI CVn&EW/KW&13.0316&36.3701&GSC 2534-0151\\
V0628 Cyg&EB&21.3404&47.1422&GSC 3595-1315\\
V0700 Cyg&EW/DW&20.3105&38.4701&GSC 3153-0421\\
V0859 Cyg&EW/KW&19.2712&28.5650&[not GSC]*\\
V1130 Cyg&EA/SD&19.3404&39.4242&GSC 3139-0951\\
EX Del&EW/KW&20.1700&15.5319&GSC 1631-0029\\
AR Dra&EA/SD&12.1637&64.5126&GCS 4158-1275\\
CV Dra&EW&17.3157&57.1042&GSC 3896-0971\\
YY Eri&EW/DW&4.1209&-10.2809&GSC 5315-0565\\
SX Gem&EA/SD&6.2814&20.3350&GSC 1336-0119\\
AV Gem&EA/SD&6.4201&13.2445&GSC 0758-1831\\
QW Gem&EB&6.5046&29.2712&GSC 1906-0346\\
SZ Her&EA/SD&17.4902&22.3223&GSC 2610-1116\\
AK Her&EW/KW&17.1358&16.2101&GSC 1536-1266\\
V0502 Her&EW/KW&17.3549&32.2053&GSC 2610-2220\\
V0742 Her&EW/KW&17.3744&44.0850&GSC 3099-1062\\
V0842 Her&EW&16.0602&50.1113&GSC 3479-0310\\
V0878 Her&EB&17.2425&49.3837&GSC 3516-0271\\
V0921 Her&EA/SD&16.4931&47.0629&GSC 3500-1050\\
V0342 Lac&EW&22.1400&51.5631&GSC 3618-2152\\
Y Leo&EA/SD&9.3651&26.1358&GSC 1962-1118\\
VZ Leo&EA/SD&9.2704&16.3513&GSC 1403-1558\\
AP Leo&EW/KW&11.0505&5.0909&GSC 0268-1025\\
BL Leo&EW/KW&11.4538&24.4651&GSC 1985-0975\\
CE Leo&EW/KW&11.4403&23.2020&GSC 1985-0265\\
RT LMi&EW/KW&9.4948&34.2716&GSC 2505-0275\\
RZ Lyn&EB/KE&9.3626&41.1552&GSC 2995-1196\\
DF Lyr&EW/D:&18.5334&28.042&GSC 2117-0384\\
MZ Lyr&EW&18.5434&26.5246&GSC 2117-2293\\
V0404 Lyr&EB/SD&19.1906&38.2159&GSC 3121-1597\\
IX Mon&EB/KE&6.5748&11.4821&GSC 0756-0410\\
V2357 Oph&EW&16.5717&10.5952&GSC 0979-1512\\
V0647 Ori&EW/DW&6.2052&3.0752&GSC 0136-0165\\
IM Per&E/DM&3.1142&52.1241&GSC 3323-1134\\
AS Ser&EB/KE&15.3849&2.1530&GSC 0355-0544\\
CX Ser&EA/SD&15.2336&2.3529&GSC 0341-0380\\
V1123 Tau&EW&3.3459&17.4238&GSC 1238-1039\\
TW UMa&EA/SD&13.4046&59.2559&GSC 3857-0280\\
XZ UMa&EA/SD&9.3125&49.2803&GSC 3429-0756\\
AA UMa&EW/KW&9.4659&45.4557&GSC 3433-1357\\
II UMa&E&12.3255&54.4743&GSC 3841-0375\\
GI Vul&EB&19.4238&26.3827&GSC 2147:3229\\
KN Vul&EW&19.5535&27.4221&GSC 2148-2711\\
NO Vul&EW/KW&19.3440&20.3637&GSC 1609-1367\\
GSC 3449-0688&EW&10.4515&52.1649&GSC 3449-0731\\
*Comp lies 3.3 N of variable

Table II -- Times of Minima:

StarB&Hel. Time&Estd&Ecl.&Detector&Fil&Remarks\\
Name&of Minimum&Error&Typ.&.&&.\\
BF Aur&53010.7487&0.0002&I&ST-7e&c&\\
V776 Cas&53351.7116&0.0001&I&ST-7XE&V&\\
SU Cep&53144.8552&0.0001&I&ST-9&V&\\
EG Cep&53187.8343&0.0001&I&ST-7XE&R&\\
XZ CMi&53010.8555&0.0003&II&ST-7e&c&\\
RW Com&53007.94105&0.00005&II&ST-7e&c&\\
RW Com&53008.06044&0.00005&I&ST-7e&c&\\
EK Com&53093.7813&0.0001&II&ST-7e&c&\\
BI CVn&53095.7933&0.0002&II&ST-7e&c&Sine O-C relation3\\
V0628 Cyg&53172.8647&0.0003&I&ST-7XE&c&Abrupt period change?? 3\\
V0700 Cyg&53261.7653&0.0002&I&ST-7XE&c&Piecewise linear O-C plot3\\
V0859 Cyg&53141.8049&0.0005&II&ST-9&c&\\
V1130 Cyg&53139.7936&0.0001&I&ST-9&c&\\
EX Del&53160.8803&0.0001&I&ST-7XE&c&New period, 0.3309880 d 3\\
AR Dra&53007.83558&0.00005&I&ST-7e&c&\\
CV Dra&53093.8837&0.0003&II&ST-7e&c&\\
YY Eri&53024.6709&0.0001&I&ST-7e&V&\\
SX Gem&53048.6821&0.0001&I&ST-7e&c&\\
AV Gem&53015.7747&0.0002&I&ST-7e&c&\\
QW Gem&53040.6172&0.0002&I&ST-7e&c&\\
SZ Her&53145.8592&0.0001&I&ST-9&V&\\
AK Her&53136.7703&0.0005&I&ST-9&c&\\
V0502 Her&53082.0075&0.0002&II&ST-7e&c&\\
V0502 Her&53121.8893&0.0002&II&ST-7e&c&\\
V0742 Her&53090.895&0.001&II&ST-7e&c&\\
V0842 Her&53111.80053&0.00005&I&ST-7e&c&\\
V0878 Her&53088.9686&0.0002&I&ST-7e&V&\\
V0921 Her&53087.9381&0.0002&I&ST-7e&c&Period uncertain1\\
V0342 Lac&53166.8349&0.0003&II&ST-7XE&c&\\
Y Leo&53089.6776&0.0001&I&ST-7e&c&Cyclic O-C relation3\\
VZ Leo&53087.7141&0.0001&I&ST-7e&c&\\
AP Leo&53092.7672&0.0002&I&ST-7e&V&\\
AP Leo&53111.7045&0.0002&I&ST-7e&c&\\
BL Leo&53112.7145&0.0003&II&ST-7e&c&\\
CE Leo&53051.882&0.0001&I&ST-7e&c&\\
RT LMi&53006.9073&0.0001&I&ST-7e&c&\\
RZ Lyn&53047.6917&0.0003&I&ST-7e&c&\\
DF Lyr&53173.8661&0.0001&II&ST-7XE&c&\\
MZ Lyr&53138.868&0.001&I&ST-9&c&\\
V0404 Lyr&53159.79647&0.00005&I&ST-7XE&c&\\
IX Mon&53053.709&0.001&I&ST-7e&c&\\
V2357 Oph&53137.7985&0.0005&II&ST-9&c&\\
V0647 Ori&53020.767&0.002&II&ST-7e&c&\\
IM Per&53352.6518&0.0002&II&ST-7XE&c&\\
AS Ser&53143.7715&0.0003&II&ST-9&c&Poor O-C relation3\\
CX Ser&53143.8626&0.0004&I&ST-9&c&Period uncertain1\\
V1123 Tau&53020.5985&0.0002&I&ST-7e&c&\\
XZ UMa&53048.7928&0.0001&I&ST-7e&c&Possible eccentric orbit3\\
TW UMa&53089.756&0.001&I&ST-7e&c&\\
AA UMa&53040.7538&0.0003&I&ST-7e&c&\\
II UMa&53081.713&0.002&I&ST-7e&V&\\
V842 UMa&53081.8388&0.0001&I&ST-7e&V&\\
GI Vul&53132.9381&0.0002&I&ST-7e&c&\\
KN Vul&53160.7803&0.0003&I&ST-7XE&c&\\
NO Vul&53123.8924&0.0001&I&ST-7e&c&\\
GSC 3449-0680&53058.68&0.001&II&ST-7e&R&Newly discovered variable2, 3\\
GSC 3449-0680&53058.96&0.001&I&ST-7e&R&\\
GSC 3449-0680&53066.809&0.001&I&ST-7e&R&\\
GSC 3449-0680&53074.938&0.001&II&ST-7e&R&\\
GSC 3449-0680&53077.744&0.001&II&ST-7e&R&\\

1 Sparse data.  
2 See IBVS 5600
3 See Eclipsing Binary O-C Files in the references.

Remarks:
Attention is directed towards the website maintained by the author and others (see Eclipsing Binary O-C Files below) that provides Excel files with times of minima and O-C plots for some 1400+ eclipsing systems.  It is being continually updated and expanded.  Another very useful utility (see below) is the Eclipsing Binary Ephemeris Generator, maintained by Shawn Dvorak, which gives eclipse predictions visible at a specified location for a give night.

Acknowledgements: 
Thanks are due to Environment Canada for the website satellite views (see reference below) that were essential in predicting clear times for observing runs in this cloudy locale.  Thanks are also due to Attilla Danko for his Clear Sky Clocks, (see below).  
This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.

References: 
Danko, A., Clear Sky Clocks, http://cleardarksky.com/
Dvorak, S., Eclipsing Binary Ephemeris Generator, http://www.rollinghillsobs.org:8000/perl/calcEBephem.pl
Kwee, K.K., & van Woerden, H., 1956, B.A.N. 12, (464), 327-330
Nelson, R.H., Eclipsing Binary O-C Files,  http://www.aavso.org/observing/programs/eb/omc/nelson_omc.shtml 
Satellite Images for North America, http://gfx.weatheroffice.ec.gc.ca/
