J004457+4123 (Sharov 21): not a remarkable nova in M 31 but a background quasar with a spectacular UV flare

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Table 2:

Detection limits on plates taken before 1950.
Telescope	Plate	Date	$m_{\rm pg,~ lim}$
		yyyy-mm-dd
Bruce astrograph LHK	23a	1900-09-14	18.8
Bruce astrograph LHK	265a	1901-08-18	18.0
Yerkes 24 inch reflector	?	1901-09-18	19.5
Bruce astrograph LHK	649a	1903-01-15	18.0
Bruce astrograph LHK	842a	1903-09-27	18.0
Bruce astrograph LHK	1384a	1905-12-26	18.0
Waltz reflector LHK	198	1907-11-02	17.5
Waltz reflector LHK	369	1908-08-20	18.3
Waltz reflector LHK	603	1909-10-19	18.5
Waltz reflector LHK	4484	1934-09-17	18.5
Bruce astrograph LHK	7163a	1949-09-20	18.2

Source LaTeX | All tables | In the text

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