* * * * * C/2010 S1 (LINEAR) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2014 10 25.40 S[12.9 AU 40.0L 257 !1.0 YOS Kita-karuizawa, Gunma (Not visible.) 2014 9 22.43 S 13.3 AU 40.0L 144 0.9 2 YOS Kita-karuizawa, Gunma (Very diffuse.) 2014 7 29.17 M 13.4 AU 22.0L 160 0.2 7 GOI Araçatuba 2014 6 30.19 S 13.5 AU 22.0L 230 0.2 7 GOI Araçatuba 2013 10 12.42 S 13.4 TA 40.0L 257 0.3 4 YOS Kita-karuizawa, Gunma (Maybe I underestimated the size due to a faint star close to the comet.) 2013 10 11.44 S 13.8 TA 40.0L 257 0.8 5 YOS Kita-karuizawa, Gunma (Faint and hard to see. The condensation became weaker than before.) 2013 9 30.816 S 13.3 AQ 30.5T 73 0.9 4/ BOU Burlage, Germany 2013 9 30.814 S 13.0 AQ 30.5T 73 1.1 3 DIJ Burlage 2013 9 28.824 S 13.1 AQ 30.5T 73 0.8 4 DIJ Burlage 2013 8 28.820 S 13.3 AQ 30.5T 73 0.8 5 BOU Burlage, Germany 2013 9 12.952 S 13.0 TA 30.5T 102 0.6 4 BOU Burlage, Germany 2013 9 12.949 S 13.0 TA 30.5T 102 1.2 3 DIJ Burlage 2013 9 4.907 S 12.9 AQ 30.5T 145 1.1 3/ DIJ Burlage 2013 9 4.902 S 13.2 AQ 30.5T 145 0.6 5 BOU Burlage, Germany 2013 9 4.07 S 13.1 AQ 32.6L 182 0.8 5 GUZ Dosłońce 2013 8 5.96 S 12.9 TA 32.6L 182 1 4 GUZ Krosno 2013 8 3.949 S 13.1 TA 30.5T 102 0.6 5 BOU Burlage, Germany 2013 8 3.947 S 12.7 TA 30.5T 102 0.7 4/ DIJ Burlage 2013 7 17.983 S 12.9 TA 25.4J 88 0.8 3 BOU Sint Annen 2013 7 6.51 S 13.2 TA 25.0L 167 0.6 1 WYA Walcha, NSW (Coma very difficult to detect even using magnification of x167, no central condensation. Comet observed at 13.4° altitude.) 2013 7 2.97 S 12.7 TA 32.6L 182 1 4 GUZ Pcim (Pretty bright, round, moderately condensed object.) 2013 6 15.07 S 12.9 AQ 20.3T 133 0.7 6 GON Alto del Castro - Aralla, León (Nearby field stars checked in DSS. Mountain location, very clear sky.) 2013 5 17.74 S 13.0 AQ 25.0L 83 0.9 3 WYA Walcha, NSW (Coma small, diffuse edges with slightly brighter core but not stellar. No tail.) 2013 5 14.73 S 13.4 AQ 25.0L 83 0.7 0/ WYA Walcha, NSW (Coma small and diffuse. Sky transparency average, difficult to see comet at times.) 2013 5 11.05 S 12.9 AQ 20.3T 133 0.7 5 GON Alto del Castro - Aralla, León (Nearby field stars checked in DSS. Observation made under better conditions, from a higher mountain location, providing a wider coma diameter and brighter m1 estimate, in comparison with my previous May 4.11 data.) 2013 5 10.75 S 12.9 TA 25.0L 83 0.6 1/ WYA Walcha, NSW (Coma is very small and diffuse, visible using direct and averted vision. Coma does not enhance with Swan Band filter.) 2013 5 4.11 S 13.3 AQ 20.3T 222 0.5 5 GON Puerto de Aralla, León (Nearby field stars checked in DSS.) 2013 4 30.992 S 13.6 AQ 30.5T 145 0.7 4 DIJ Burlage 2013 4 30.988 S 13.5 AQ 30.5T 145 0.4 4/ BOU Burlage, Germany 2013 4 20.15 S 13.1 AQ 20.3T 206 0.4 5 GON Puerto de Aralla, León (Nearby field stars checked in DSS. Mountain location, very clear sky.) 2012 12 7.806 S 13.4 TA 30.5T 117 0.6 2 DIJ Burlage 2012 12 7.801 S 13.4 TA 30.5T 117 0.6 4 BOU Burlage, Germany 2012 11 6.94 S 13.0 HN 20.3T 160 0.7 5 GON Pandorado, León (Nearby field stars checked in DSS. Comparison stars taken from Henden photometry near Z UMi. Mountain location, very clear sky.) 2012 10 7.826 S 13.5 TA 30.5T 117 0.5 5 BOU Burlage, Germany 2012 10 7.824 S 13.5 TA 30.5T 117 0.6 3/ DIJ Burlage 2012 9 19.924 S 13.5 AQ 30.5T 117 0.6 6 BOU Burlage, Germany 2012 9 19.922 S 13.8 AQ 30.5T 117 0.7 3/ DIJ Burlage 2012 9 15.953 S 13.8 AQ 30.5T 117 0.6 3 DIJ Burlage 2012 9 15.951 S 13.6 AQ 30.5T 117 0.5 5 BOU Burlage, Germany 2012 8 21.96 S 13.0 AQ 20.3T 133 0.5 6 GON Alto del Castro, León (Nearby field stars checked in DSS.) 2012 8 19.68 S 13.8 TA 40.0L 144 0.8 6 YOS Kita-karuizawa, Gunma (Compact. Bright, strongly condensed, and easy to see. It has been locating almost in the same area since last autumn.) 2012 7 24.010 S 13.8 AQ 30.5T 145 0.6 4 DIJ Burlage 2012 7 24.008 S 13.8 AQ 30.5T 145 0.6 3 BOU Burlage, Germany 2012 7 16.94 S 13.2 AQ 20.3T 206 0.8 6 GON Pandorado, León (Nearby field stars checked in DSS.) 2012 5 26.997 S 14.1 UD 30.5T 145 0.6 4 DIJ Burlage 2012 5 26.995 S 13.9 UD 30.5T 145 0.4 4 BOU Burlage, Germany 2012 5 17.033 S 13.9 UD 30.5T 117 0.5 2/ DIJ Burlage 2012 5 17.031 S 13.9:UD 30.5T 117 0.5 4 BOU Burlage, Germany 2012 2 10.69 V 14.5:UD 6.7R NOV Nizhniy Arkhyz (remotely) 2011 11 27.985 S 14.1 TA 30.5T 145 0.4 2/ DIJ Burlage 2011 11 27.981 S 13.8 TA 30.5T 145 0.4 5 BOU Burlage, Germany 2011 11 25.41 S 13.6 UV 40.0L 144 0.6 6 YOS Gunma, Japan (Maybe I overestimated the diameter, because it was located just beside a 13.6 mag star.) 2011 11 24.59 S 13.6 UV 40.0L 257 0.3 6 YOS Gunma, Japan (Small, but easy to see.) 2011 10 23.855 S 14.1 TA 30.5T 145 0.6 6 DIJ Burlage 2011 10 23.852 S 14.1 TA 30.5T 145 0.5 5 BOU Burlage, Germany (Comet close to star of 14th magnitude.) 2011 10 7.75 S 14.3 UV 40.0L 257 0.3 6 YOS Kita-karuizawa, Gunma (It looks soft, although I had imagined that it would look almost stellar.) 2011 10 1.820 S 13.9 TA 30.5T 179 0.7 3 DIJ Burlage 2011 10 1.818 S 13.9 TA 30.5T 179 0.5 4 BOU Burlage, Germany 2011 9 29.846 S 13.7 TA 30.5T 117 0.8 4 DIJ Burlage 2011 9 29.843 S 13.8 TA 30.5T 117 0.6 4 BOU Burlage, Germany 2011 8 31.95 S 14.0:UD 25.4L 342 0.3 6 IVA Saratov 2011 8 6.90 S 13.7 UD 25.4L 170 0.7 4 IVA Melovoe 2011 8 4.03 S 13.5 HN 20.3T 133 0.8 5 GON Alto del Castro - Aralla, León (Nearby field stars checked in DSS. Comparison stars taken from Henden photometry - Z UMi field. Mountain location, very clear sky.)