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    Brightening of Nova Cas 1995    

December 22, 2001
Yoshida, S.; Ohkura, N.

The significant small sudden brightening of V723 Cas = Nova Cas 1995 between 2001 Oct. 13 and 14, about 6 years after the peak in 1995 December, was detected by the MISAO Project.

Star A: USNO-A2.0 1425.01502823  01h04m55s.027 +53o58'08".89  Mag(R):12.2  Mag(B):13.6
Star B: USNO-A2.0 1425.01502160  01h04m53s.189 +54o00'05".21  Mag(R):13.6  Mag(B):14.4
Star C: USNO-A2.0 1425.01510597  01h05m16s.428 +54o00'46".55  Mag(R):13.7  Mag(B):15.1

The table below shows the magnitude data of the nova and three comparison stars measured automatically by the PIXY system 2 from CCD images taken by Nobuo Ohkura, Okayama, Japan.

Oct. 13.5814614.3311.8314.0114.47
Oct. 13.5834314.2911.8513.9014.47
Oct. 13.5854114.4511.9314.1014.59
Oct. 14.5843814.0311.8714.0614.46
Oct. 14.5863413.9711.8513.9714.40

The table below shows the relative magnitude. The average magnitude of star A, B and C on each date is subtracted from the raw magnitude.

Oct. 13.581460.89-1.610.571.03
Oct. 13.583430.88-1.560.491.06
Oct. 13.585410.91-1.610.561.05
Oct. 14.584380.57-1.590.601.00
Oct. 14.586340.56-1.560.560.99

Here is the light curve of the relative magnitude.

The VSNET visual data in 2001 October are as follows:

Oct. 6.78414.3RMQ
Oct. 8.77514.5BMU
Oct. 13.15514.4MRV
Oct. 16.87414.2CMG
Oct. 16.92314.3BMU

The small brightening was not detected clearly by visual observers.

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