* * * * * C/2016 R2 (PANSTARRS) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2019 1 14.19 S 10.5 TK 20.3T 77 6 1/ GON Alto del Castro - Aralla, León (Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail.) 2019 1 2.26 S 10.7 TK 20.3T 100 6 1 GON Alto del Castro - Aralla, León (Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Several stars inside the coma, the brightest being mag. 12.6 [AQ].) 2018 11 16.16 S 10.2 TK 20.3T 100 7 1/ GON Collada del Fresno - Sierra del Aramo, Asturias (Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Altitude 18°.) 2018 11 13.16 S 10.2 TK 20.3T 77 7 1/ GON Collada del Fresno - Sierra del Aramo, Asturias (Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Mag. 12.1 [TK] star in coma. Altitude 18°.) 2018 11 9.19 S 10.3 TK 20.3T 77 6 1/ GON Collada del Fresno - Sierra del Aramo, Asturias (Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Altitude 25°.) 2018 11 3.80 S[11.8 TA 40.0L 144 !1.1 YOS Kita-karuizawa, Gunma (Not visible. The background sky of the low sky was bright.) 2018 11 3.80 S 10.5 TK 20.3T 77 5 2 GON Pandorado, León (Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Altitude 14°.) 2018 10 20.20 S 11.0 TK 20.3T 77 5 2 GON Alto del Castro, León (Altitude 23⪚.) 2018 10 16.18 S 10.7 TK 20.3T 100 5 2 GON Alto del Castro, León (Altitude 18°.) 2018 10 5.785 S 13.3 AQ 25.4J 88 1.3 3 BOU Lauwersoog 2018 10 3.84 S 10.3 TK 20.3T 100 6 2 GON Alto del Castro, León (Altitude 16°.) 2018 9 1.87 S 10.5 TK 20.3T 77 5 2 0.3 10 GON Alto del Castro, León (Observation made under better conditions than in my previous August estimates. It was possible to separate the faint tail from the coma for the m1 determination. Altitude 18°.) 2018 8 14.90 S 10.4 TK 20.3T 77 7 1/ GON Alto del Castro, León (Faint tail difficult to separate from the coma. The bright magnitude estimate is related to the 7' observed width of the coma and tail. Altitude 16°.) 2018 8 9.90 S 10.7 TK 20.3T 77 6 1/ GON Alto del Castro, León (Better observing conditions than in previous dates allowed to observe some extension of the faint tail, difficult to separate from the coma. The brighter magnitude estimate is related to the 6' observed width of the coma and tail. Altitude 16°.) 2018 8 1.90 S 11.3 TK 20.3T 77 2.5 2 GON Alto del Castro, León (End of astronomical twilight. Altitude 18°.) 2018 7 9.92 S 11.3 TK 20.3T 77 2.5 2/ GON Alto del Castro, León (End of astronomical twilight. Altitude 17°.) 2018 6 12.93 S 11.5 TK 20.3T 77 2 2 GON Pandorado, León (Altitude 15°.) 2018 5 15.90 S 11.3 TK 20.3T 133 2 2/ GON Pandorado, León (Zodiacal light. Altitude 22°.) 2018 5 8.90 S 11.1 TK 20.3T 77 2.5 2 GON Pandorado, León (Zodiacal light. Altitude 24°.) 2018 5 4.92 S 11.2 TK 20.3T 133 2.2 2 GON Alto del Castro, León (Zodiacal light. Observation made under better conditions, from a higher mountain location, providing a wider coma diameter and brighter m1 estimate in comparison with my previous Apr. 18.94 observation.) 2018 5 4.48 S 13.2 TA 40.0L 257 0.6 2 YOS Kita-karuizawa, Gunma (It became faint, although it is at the perihelion now.) 2018 5 3.50 S 13.1 TA 40.0L 257 0.9 3/ YOS Kita-karuizawa, Gunma 2018 4 18.94 S 11.5 TK 20.3T 100 1.5 3 GON Puerto de Aralla, León 2018 4 5.86 S 10.5 TK 20.3T 77 4 2/ GON Alto del Trichero, León (Observation made under better conditions, from a higher and darker mountain location, providing a wider coma diameter and brighter m1 estimate in comparison with my previous Mar. 20.86 observation.) 2018 4 5.837 S 11.7 AQ 30.5T 102 1.7 2/ BOU Burlage, Germany 2018 4 5.835 S 11.6 AQ 30.5T 102 1.2 3 DIJ Burlage 2018 3 20.86 S 11.2 TK 20.3T 100 2.5 3 GON Villacintor, León 2018 3 18.853 S 11.7 AQ 30.5T 102 1.6 2/ BOU Burlage, Germany 2018 3 18.851 S 12.1 AQ 30.5T 102 1.3 2/ DIJ Burlage 2018 3 18.41 S 12.4 AQ 25.0L 83 1.3 2/ WYA Walcha, NSW (Low altitude 8.6°. Poor seeing, diffuse and difficult to observe.) 2018 3 14.855 S 11.6 AQ 30.5T 102 1.8 2 BOU Burlage, Germany 2018 3 14.854 S 11.5 AQ 30.5T 102 2.5 2 DIJ Burlage 2018 3 12.43 S 11.6:TA 40.0L 75 1.5 3 YOS Mt. Hanadate, Ibaraki (Overlapping on a 12.8 mag star, so somewhat difficult to observe. But still bright and well visible.) 2018 3 11.41 S 11.6 AQ 25.0L 39 3 3 WYA Walcha, NSW (Low altitude 11.5°. No enhancement in Swan Band filter. Poor seeing.) 2018 2 17.874 S 11.6 AQ 30.5T 73 2.1 2 BOU Burlage, Germany 2018 2 17.872 S 11.7 AQ 30.5T 73 1.9 2 DIJ Burlage 2018 2 17.83 S 10.5 TK 20.3T 100 4 3 GON Alto de la Garandilla - Escuredo, León 2018 2 13.776 S 11.4 AQ 25.4J 58 2.7 2 BOU Lauwersoog 2018 2 12.899 S 11.5 AQ 30.5T 73 2.0 2 BOU Burlage, Germany 2018 2 12.897 S 11.6 AQ 30.5T 73 2.1 4 DIJ Burlage 2018 2 12.84 S 10.5 TK 20.3T 77 4 3 GON Collada de la Cobertoria, Asturias 2018 2 10.43 M 12.1 AQ 25.0L 83 2.5 3/ WYA Walcha, NSW (Coma opaque in centre, interference by stars in coma.) 2018 2 8.44 S 11.6 AQ 25.0L 83 2.5 3 4m 94 WYA Walcha, NSW (Faint tail visible. Opaque oval shaped inner coma. Does not enhance in Swan Band filter.) 2018 2 7.885 S 11.3 AQ 30.5T 73 2.5 2 BOU Burlage, Germany (Star of magn. 13.3 inside coma.) 2018 2 7.882 S 11.7 AQ 30.5T 73 2.4 3/ DIJ Burlage (Star of magn. 13.3 in coma.) 2018 2 7.44 S 11.9 AQ 25.0L 83 2.7 3 WYA Walcha, NSW (Coma diffuse, slight brightening to an opaque centre.) 2018 2 6.780 S 11.2 AQ 25.4J 58 2.5 2/ BOU Lauwersoog 2018 2 6.45 S 11.4 AQ 25.0L 39 4.8 3 WYA Walcha, NSW (Coma large and diffuse.) 2018 2 5.45 S 11.1 AQ 25.0L 39 4.2 3 WYA Walcha, NSW (Very diffuse coma, faint background stars within coma.) 2018 2 4.98 S 11.0 AU 22.0L 160 2 2 GOI Araçatuba 2018 1 22.50 M 11.3 AQ 25.0L 39 3.6 3/ WYA Walcha, NSW (Opaque centre, diffuse outer coma. Slight moonlight interference.) 2018 1 20.44 M 11.2 AQ 25.0L 39 5.7 4 WYA Walcha, NSW (Close to stars, does not enhance in Swan Band filter. Inner coma elongated to the East approximately.) 2018 1 19.47 M 11.3 AQ 25.0L 39 3.8 3/ WYA Walcha, NSW (Does not enhance in Swan Band filter. Close to stars, slight interference. Inner coma elongated to the East approximately.) 2018 1 17.92 S 10.0 TK 20.3T 77 5 2/ GON Puerto de Aralla, León 2018 1 17.45 M 11.4 AQ 25.0L 39 4 4 WYA Walcha, NSW (Does not enhance in Swan Band filter. Close to faint stars, slight interference. Inner coma elongated to the East approximately.) 2018 1 16.45 M 11.3 AQ 25.0L 39 5.5 3/ WYA Walcha, NSW (Bright star in coma, opaque centre.) 2018 1 15.46 M 11.3 AQ 25.0L 39 3.9 3 WYA Walcha, NSW (Coma elongated to the East approximately.) 2018 1 14.841 S 10.9 AQ 30.5T 54 3 2 BOU Burlage, Germany 2018 1 14.838 S 11.2 AQ 30.5T 54 2.5 1 DIJ Burlage 2018 1 14.45 M 11.2 AQ 25.0L 39 4.8 3 6.3m 90 WYA Walcha, NSW (No enhancement in Swan Band filter. Short broad tail visible.) 2018 1 12.43 S 11.0 AQ 25.0L 39 4.8 3 WYA Walcha, NSW (Coma diffuse, slight brightening to centre.) 2018 1 8.92 S 10.0 TK 20.3T 77 5 2 GON Valdespino Cerón, León 2018 1 7.799 S 11.3 AQ 15.5L 42 3 4 DIJ Burlage 2018 1 6.48 S 11.1 TA 40.0L 75 2.6 5 YOS Mt. Hanadate, Ibaraki (Bright. Near the Hyades.) 2018 1 5.45 M 10.7 AQ 25.0L 39 7 4 WYA Walcha, NSW (Does not enhance in Swan Band filter. Opaque centre, semi-transparent outer coma. Slight interference by mag 3.7 star, 13.5 away to the NE.) 2017 12 23.59 M 11.2 AQ 25.0L 39 3.5 3/ WYA Walcha, NSW (Interference by faint stars in coma. Does not enhance in Swan Band filter.) 2017 12 20.13 S 10.2 TK 20.3T 77 5 2/ GON Puerto de Aralla, León 2017 12 19.45 S 11.0 TJ 40.0L 75 2.6 3 YOS Mt. Hanadate, Ibaraki (Bright and large.) 2017 12 18.72 S 11.5 TJ 40.0L 75 2.3 3 YOS Mt. Hanadate, Ibaraki 2017 12 16.14 S 10.1 TK 20.3T 77 5 2 GON Villacintor, León (Increasing activity. It is difficult to separate the contribution of the inner ion tail from that of the coma to the total magnitude m1. Field stars checked in DSS.) 2017 12 15.08 S 12.3 AU 22.0L 160 1 4 GOI Araçatuba 2017 12 14.66 M 10.8 AQ 25.0L 39 3.8 3/ 5m 100 WYA Walcha, NSW (Coma does not enhance in Swan Band filter.) 2017 12 13.60 M 11.0 AQ 25.0L 39 3.2 4 5.6m 358 WYA Walcha, NSW (Interference by star pair in coma. Coma dims in Swan band filter.) 2017 12 11.39 S 11.4 TJ 40.0L 144 1.8 3 YOS Kita-karuizawa, Gunma (Somewhat hard to see due to the low sky condition.) 2017 12 7.45 S 11.2 AQ 25.0L 39 2 3 WYA Walcha, NSW (Does not enhance in Swan Band filter. Coma appears elongated to the West approximately.) 2017 11 26.17 S 11.1 AQ 20.3T 133 2.5 3 GON Puerto de Aralla, León (Field stars checked in DSS.) 2017 11 24.75 S 12.6 TA 40.0L 144 1.4 4 YOS Kita-karuizawa, Gunma (Very bright. Easy to see.) 2017 11 24.67 S 12.3 AQ 25.0L 39 2.4 3 WYA Walcha, NSW (Coma pale blue in colour and diffuse with an opaque centre. Appears elongated to the NW approximately. Does not enhance in Swan Band filter.) 2017 11 22.947 S 12.6 AQ 25.4J 115 1.0 4 BOU Sint Annen 2017 11 16.995 S 12.7 AQ 30.5T 102 0.9 3 BOU Burlage, Germany 2017 11 16.988 S 12.9 AQ 30.5T 102 1 3/ DIJ Burlage 2017 11 16.18 S 11.7 AQ 20.3T 133 1.3 3/ GON Puerto de Aralla, León 2017 11 14.19 S 11.8 AQ 20.3T 133 1.3 3 GON Puerto de Aralla, León (Field stars checked in DSS.) 2017 11 14.14 S 12.8 AU 22.0L 160 1 3 GOI Araçatuba 2017 11 9.49 S 12.9 AQ 25.0L 83 1 3 WYA Walcha, NSW (Difficult due to glare from bright star at edge of field.) 2017 10 30.69 S 12.8 AQ 25.0L 83 2 2/ WYA Walcha, NSW (Coma diffuse. Interference from mag 12.8 star in coma. Slight brightening to centre, does not enhance in Swan Band filter.) 2017 10 26.68 S 13.2 TA 40.0L 257 0.7 3/ YOS Kita-karuizawa, Gunma (Getting brighter. Well visible.) 2017 10 3.20 S 13.2 AQ 20.3T 133 1.1 3 GON Puerto de Aralla, León (Field stars checked in DSS.) 2017 9 27.61 S 13.9 AQ 25.0L 83 0.6 3 WYA Walcha, NSW (Coma very diffuse, small. Visible in periods of good seeing. Slight haze from dust and bushfire smoke.) 2017 9 25.73 S 14.0 AU 40.0L 257 0.6 3 YOS Kita-karuizawa, Gunma (Near limit.) 2017 9 21.75 S 13.8 AQ 25.0L 83 0.9 3 WYA Walcha, NSW (Outer coma diffuse, slight brightening to centre. Does not enhance in Swan Band filter.)