彗星亮度日报 C/2011 L4 PANSTARRS 2013 Feb 8.75 UT Magnitude 5.9 The ion tail is nearly 1 degree in PA 210 whilst the leading edge of the dust tail is 30' in PA 250 C/2012 F6 Lemmon 2013 Feb 8.74 UT Magnitude 5.5 The ion tail is at least 3 degrees long in PA 165展开全文
