Result in AAVSO format:

2158+41 BL LAC    2453236.5286 13.48 K CCDV113,117,118AVSOMAT CXR                                                                                  


Using Tycho-VT reference stars, transformed to Johnson:

NAME    MAG        GSC-1 ID        GSC-2 ID
1B    11.39    GSC3206-1959     N0323031552
2O    11.75    GSC3206-1639     N0323031627
3X    11.83    GSC3206-1511     N0323031603


FITS HEADER:

RESOLUTION (bit/pixel): 
IMAGE SIZE:  x 
DEG PER PIXEL:  x 
CCD BINNING: 2 x 2
SENSOR TEMP (K): 238.3
EXP TIME (s): 10.000

OBJECT: bllac
JDATE EXP START: 2453236.52857976
RA: 22:02:43.29
DEC: 42:16:39.9
EQUINOX: 

OBSERVER: R.Corlan
LATITUDE: 44:25:50.0
LONGITUDE: -26:06:50.0
ALTITUDE: 75.0

INSTRUMENT: cpx3m
FILTER: v
TELESCOPE: SCT
FOCUS: Cassergrain
FOCAL LENGTH (cm): 200.0
APERTURE (cm): 30.0

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