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Re: [vsnet-chat 6007] Re: [AAVSO-DIS] Re: v1413 Aql - Ready for Eclipse > No, I don't believe the mag. 16 with 10cm aperture either. At high > power, something like 150x or so with this aperture, the V limit will be > between 14.5 and 15. Seeing has to be good, of course, to get this faint, > probably 1" fwhm or better. I agree that this value is reasonable under good conditions. The magnitude 13.5 is too bright. > Maybe Hasegawa was using B magnitudes (which will be numerically > larger than V magnitudes) for this reckoning. No, at the time of these observations, Hasegawa-san used V-magnitude sequences, either from literature or from "photographic V" determinations. I just remember that Hasegawa-san was also very inclined to blazar observations (with the same 10 cm telescope). His limiting magnitude played the most important role in such faint objects as OJ 287, 3C 279, 4C 29.45 etc. He positively recorded these objects at around 15 or sometimes fainter (I even saw a report of 16.2 or possibly below this). The values are not inconsistent with the modern knowledge, and were not inconsistent with the quasi-simultaneous photographic observations (the object was sometimes undetected by a 30cm photographic instrument, but was positively recorded by a 10cm visual observation). Regards, Taichi Kato
Return to the Powerful Daisaku Nogami
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