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[vsnet-campaign 398] photometry of GSC stars in 1H 1933+510 field

Dear 1H 1933+510 campaigners,
 
The following GSC stars were in my CCD field during the fantastically
photometric night I was lucky to have on June 8, 2000.  I had 1H 1933+510
near the extreme south end of the frame, so all but one of these guide
stars are north of the CV target.  The calibration fit was excellent,
very low residual values; and was based on two Landolt standards, one
very red and one very blue, observed as a pair on four occasions during
the night over a wide range of airmass.  In short, you can really trust
these magnitudes and colors!  I even observed this 1H 1933+510 field
twice in each filter.
 
I've ordered them in increasing R.A., taking the coordinates exactly as
they are stated in the on-line Guide Star Catalogue.  I have measured
1H 1933+510 to be located just 13 arcsec WNW of GSC 3568-115.


 ID             RA (2000.0) Dec (2000.0)   V    B-V   V-R   V-I

 GSC 3568-405   19 34 27.12 +51 10 24.5  13.37  0.66  0.38  0.71
 GSC 3568-352   19 34 30.91 +51 11 21.6  13.74  1.14  0.59  1.10
 GSC 3568-1208  19 34 32.62 +51 08 02.5  14.00  0.64  0.39  0.76
 GSC 3568-115   19 34 37.32 +51 07 38.0  13.83  0.63  0.38  0.72
 GSC 3568-25    19 34 37.44 +51 08 45.0  14.01  0.56  0.33  0.64
 GSC 3568-667   19 34 40.78 +51 09 32.9  12.53  0.48  0.30  0.56
 GSC 3568-16    19 34 51.34 +51 09 00.2  13.20  0.47  0.32  0.60
 GSC 3568-81    19 34 52.06 +51 08 36.6  13.54  0.78  0.50  0.92
 
Of the other stars in the frame, a useful one that is similar in
brightness to 1H 1933+510's outbursts and is very near 1H 1933+510
is located just 15 arcsec south and slightly east of GSC 3568-1208.
For that star, I have

 comp           19 34 32.7  +51 07 48    16.62  0.9   0.40  0.83
 
The B-V color is +-0.1 for this star, while the other values are
uncertain by 0.03 to 0.04 (as judged mostly by the scatter in the
two independent observations).
 
I hope somebody finds this field useful for observing.

                                                        -- Claia Bryja

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