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/
