RELATION OF BRIGHTNESS VARIATIONS OF SHORT-PERIOD COMETS 28P/NEUJMIN 1, 53P/VAN BIESBROECK, 63P/WILD 1 WITH THE ACTIVITY OF THE SUN

Abstract

The report examines the relationship between the brightness variation of the daily mean values of comets 28P/Neujmin 1,53P/Van Biesbroeck, 63P/Wild 1 with the activity of the Sun. The correlation coefficient of the mean daily brightness of comets versus.Wolf number and the area of sunspots for each orbital period of the above comets have been determined. It turned out
that the influence of solar activity in comet 28P/Neujmin 1 is insignificant in comparison with comets 53P/Van Biesbroeck, and 63P/Wild 1. Only in the appearance in 1966 the value r (W) = 0.92 r (S) = 0.94, in other occurrences (1931, 1984, 2002 and 2020), the value of the correlation coefficient is  insignificant. Although the diameter of the comet’s nucleus is larger than that of other short-period comets, and the albedo in the R filter is only 0.03. The values of the correlation coefficient for comet 53P/Van Biesbroeck in the appearances (1978, 1991, 2003, and 2016) are in the range 0.56÷0.77 (for the Wolf number) and 0.54÷0.71 (for the sunspot number).