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Date: Wed, 5 May 93 20:14:45 GMT From: gav@astro.as.utexas.edu (Gerard de Vaucouleurs) Subject: SN1993J >From G. de Vaucouleurs (gav@astro.as.utexas.edu) (5.05.93) W. Wren (McDonald Obs.) communicates the following visual observations of SN1993J made with his 60-cm reflector by reference to the Thompson-Bryan Chart for M81. JD.... mv JD.... mv JD.... mv JD.... mv JD .... mv 077.63 10.5: 078.64 10.5 079.65 10.6 80.68 11.2 81.77 11.9 082.69 12.0 084.73 11.6 085.67 11.7 086.71 12.0 087.68 11.7 088.67 11.7 089.62 11.5 093.62 11.1 095.66 11.0 096.61 11.1 097.67 11.1 098.65 11.1 101.63 11.4 102.65 11.4 106.79 11.7 108.62 11.8 109.63 11.8 110.70 12.0 112.67 12.4 By comparison with a provisional pe+CCD-based V-band mean light curve I find the following mean corrections to reduce the above mv to V: March 31 to April 3 (JD 77.63 to 80.68) <V-mv> = +0.53 (n=4, s.d.= 0.21) April 4 to April 8 (81.77 to 85.67) = -0.04 (n=4, s.d.= 0.12) April 9 to April 12 (86.71 to 89.62) = -0.38 (n=4, s.d.= 0.06) April 16 to May 5 (93.62 to 112.67) = -0.16 (n=12, s.d.= 0.12) ****************************************************************************** R. Buta (U. of Alabama) communicates the following visual estimate with a 25-cm refractor (T-B chart): April 28.1 = JD ....105.6, mv = 11.6 ******************************************************************************
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