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Date: Sun, 11 Apr 93 21:03:23 GMT From: gav@astro.as.utexas.edu (Gerard de Vaucouleurs) Subject: SN1993J additions and corrections >From G. de Vaucouleurs (gav@astro.as.utexas.edu) Additional V or mv magnitudes (suppl2, 4/11/93): 085.62 11.56 v TB Bryan, J., 25cm Refl. 086.57 11.46 v TB Bryan, J., 25cm Refl. (mean of 3 obs.) 088.59 11.1 v TB Buta, R., 25cm refr. Corrections and revisions: 074.80 = 03/28.30 13.8 v by Neely, A. for *C=14.6, could be revised to 13.2 (not 13.4) if *C=14.0. New UBV observations of *C are needed. 075.36 = 03/28.86 was listed as 12.0 in IAUC 5731, what is the source of 11.8? 075.39 = 03/28.89 was listed as 11.8 in IAUC 5731, what is the source of 11.6? The entry (11.8 by Rodriguez) listed for 03/29.1 from IAUC 5731 should be deleted, see correction in IAUC 5733. The entry (11.3 mv Garcia, F.) listed for 03/29.88 from Mail(gav) should be deleted, it duplicates (11.3 mv by Pujol) for the same date (my mistake). What does 'S' stand for on 03/31.087 (10.0 mv S by Moore)? The entries from Kidger's table should be clarified, some look like repeats of adjacent entries with slightly different dates or magnitudes. Could someone please tabulate the magnitudes of the comparison stars in common between GSC (GP), SSC (TB), The Astronomer (TA), AAVSO (AC)? I don't have access to the last two sources. Mr. J.-C. Merlin has kindly clarified his negative observation of 03/27.91 UT from 3 image-tube photographs with his 40cm reflector and confirmed that the limiting magnitude was 16, or fainter. Stars of V = 15.0, 15.2 and 15.3 on the SSC(TB) chart were easily seen. This would imply a brightening of 3 magnitudes or more in less than 3 1/2 hours, if indeed the supernova was at 13.2 on 03/28.30 (13.8 after Neely, corrected for *C zero point from 14.6 GSC to 14.0 SSC). A clarification and verification of this most important first positive observation is desirable. Also, it would be most helpful if Messrs. Garcia and Rodriguez could clarify the identification and adopted magnitudes of their comparison stars. Their discovery observation is critically important in defining the rising branch of the light curve.
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