[vsnet-alert 17873] Re: Gaia14aaf = MASTER OT J161700.81+620024.9

[roberto nesci]

Following the message by Denisenko, I looked in the Digitized First 
Byurakan Survey objective-prism plate archive, to see if the star was 
visible. There are three plates covering the object, two in the same 
night (1971-06-18) n.486 (IIAF emulsion) and n.487 (Zu-2 emulsion). In 
both plates the star is visible, albeit rather faint: in the 486 plate 
the magnitudes derived from the spectrum are B=16.2, R=16.6 (in the 
USNO-A2 magnitude scale), indicating a blue star as expected for a 
cataclismic variable.
The spectra of the plate n.799 (1973-05-06) are not present in the 
database, but the star is detected on the plate, at the detection limit.
The historical data from the Palomar Survey plates (USNO-B1) show a 
magnitude range of about 1.7 mag.
Roberto Nesci

-- 
prof. Roberto Nesci,  associated to Istituto Nazionale di Astrofisica,
(National Institute of Astrophysics) INAF-IAPS, via Fosso del Cavaliere 
100, 00133 Roma, Italia