June 2001 outburst of V587 Lyr = TK5 Lyr (UG)
|V587 Lyr was discovered by T. V. Kryachko of
Sternberg Astronomical Institute (Russia) on Moscow archive plates (see IBVS
5058) taken with the 40-cm astrograph. It appears as a blue object on
the Palomar prints.
The UG-variability of V587 Lyr was derived by Kryachko from a total of
220 magnitude estimates. Apparently, the star is having rather frequent
outbursts, and the cycle is estimated to be approx. 60 days.
The FITS image above has North up and was acquired with an unfiltered ST-7 CCD camera. The image below was taken 6 days earlier and does not show the variable. TK5 Lyr is located at RA = 19h17m26.5s, Decl = +37°10'41" (2000.0), and has a magnitude range of 14.3 - <17.1p.
I performed a differential photometry run on this object on June 18/19, for 2.1 hours. The resulting light curve (see below) does not show significant modulations. The variable is around mag 15.2 (unfiltered).
(c) Copyright Tonny Vanmunster, 2001