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[vsnet-campaign 394] the bright star near 1H 1933+510
>>Can anyone confirm that the object 1H 1933+510 is located at 19h 34m 36.1s
>>and +51deg 07' 39" ? This is just a few arc seconds West of the GSC star
>>3568-115. I have the following observation:
>>
>>
>>1H1933+510 20000724.319 :15.8V OCN
>>
>>
>>regards,
>>
>>Steve O'Connor
I've now checked the on-line guide star catalogue carefully, and I can
confirm that the bright companion to 1H 1933+510 is indeed GSC 3568-115.
The positions of other bright stars around it in the GSC match perfectly,
so the given coordinates of 1H 1933+510 must be just slightly off. I'll
repeat that 1H 1933+510 is North 4.3 arcsec and West 12.0 arcsec from
GSC 3568-115.
My observations on June 8, 2000, were photometric. On that night, I
observed the above stars twice each in BVRI, along with two Landolt
standards which I observed multiple times. I therefore have very good
absolute photometry of GSC 3568-115. Here it is. The errors come from
the calibration fits, the electron counting statistics, and also consider
the scatter between the two separate observations.
GSC 3568-115 V = 13.834+-0.005
B-V = 0.633+-0.013
V-R = 0.378+-0.011
V-I = 0.717+-0.014
Using this as a comparison star for the many non-photometric nights I
was observing 1H 1933+510 (which I like to call DS-Cyg2, the DS standing
for Downes & Shara-- it's just easier to type), I can presently post
absolute V magnitudes for those nights. My V filter is a very good
match to standard Johnson V. My other filters have more significant
color terms-- especially the B filter-- so I'll work on the other
colors tomorrow (using more comparison stars) and just post the V
magnitudes today.
I notice that the above V magnitude for GSC 3568-115 is about 0.8
magnitudes fainter than the "mag" listed in the online Guide Star
Catalogue.
-- Claia Bryja
vsnet-adm@kusastro.kyoto-u.ac.jp
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