* * * * * C/2002 Y1 (Juels-Holvorcem) * * * * *

lightcurve Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2003 7 27.69 S 10.9 TK 28.0T 133 3 3 MAT Wallaroo, SA 2003 7 27.68 S 10.6 TK 10.0B 25 4 3 MAT Wallaroo, SA 2003 7 3.74 S 9.0 AA 10.0B 25 5 4 SEA The Entrance, NSW 2003 5 31.78 B 7.9 GA 10.0B 25 9 5 SEA Cowra, NSW 2003 5 29.83 M 8.0 TK 10.0B 25 4 5 MAT Wallaroo, SA (Coma well enhanced with Swan Band filter.) 2003 5 25.82 M 7.9 TK 10.0B 25 3 5 MAT Wallaroo, SA 2003 5 7.80 S 6.8:AA 10.0B 25 6 SEA Cowra, NSW (Poor conditions due to thin high cloud and low altitude of comet. Comet strongly enhanced thro Swan Band filter.) 2003 4 14.10 M 6.7 TK 7.0R 24 2.5 6 GRA Fjellhamar (Only faintly visible due to twilight [Sun 12 deg. below horizon] and 8 deg. altitude. NEL=3.0 [approx.] near comet.) 2003 4 12.126 sM 6.3 TK 8.0B 15 8 BOU Thesinge (Twilight. 10d Moon 4 deg. over W. horizon. Comet only at 7.5 deg. elevation.) 2003 4 11.16 B 6.6 HV 5.0B 7 3 7 BIV Poigny-la-Foret (In 25.6cm-L at 42x 0.2 deg. tail in p.a. 320 deg.) 2003 4 9.16 B 6.5 HV 5.0B 7 2 7 BIV Poigny-la-Foret (In 25.6cm-L at 42x 0.2 deg. tail in p.a. 320 deg.) 2003 4 9.11 M 6.7 TK 15.2L 44 3 6 GRA Fjellhamar (Twilight, altitude 12 deg., NEL=4.0 [approx.] near comet.) 2003 4 8.18 B 6.1 TJ 5.0B 7 3 8 0.5 340 GON Alto del Castro - Aralla, Leon (Comparison stars at the same low altitude as the comet.) 2003 4 8.124 M 6.3 TK 8.0B 15 3 8 1.0 332 BOU Sint Annen 2003 4 8.11 M 6.6 TK 5.0B 7 4 6 GRA Fjellhamar 2003 4 8.11 M 6.8 TK 15.2L 44 3.5 0.25 335 GRA Fjellhamar (Tail only barely visible with 15.2L.) 2003 4 7.16 S 6.6 HV 5.0B 7 3 7 BIV Ablis (In 25.6cm-L at 42x 0.25 deg. tail in p.a. 335 deg.) 2003 4 7.128 M 6.3 TK 8.0B 15 3 8 1.3 334 BOU Sint Annen 2003 4 7.09 M 6.6 TK 5.0B 7 4 6/ GRA Hågår Obs., Eina (Clearly visible despite altitude 10 deg. and twilight. Clouds made m1 estimate somewhat challenging. NEL=4.5 [approx.].) 2003 4 6.18 B 6.1 TJ 5.0B 7 3 7 0.5 340 GON Alto del Castro - Aralla, Leon (Comparison stars at the same low altitude as the comet.) 2003 4 3.17 B 6.7 HV 5.0B 7 3 7 BIV Poigny-la-Foret (In 25.6cm-L at 42x 0.3deg. tail in p.a. 345deg.) 2003 4 3.11 M 6.7 TK 5.0B 12 4 6 GRA Fjellhamar 2003 4 3.11 M 6.8 TK 15.2L 44 4 6/ 0.8 345 GRA Fjellhamar (With 7x50B, comet appeared somewhat fainter and smaller than M15, that was seen under a similar geometry. With 15.2L, tail was faint and rather broad, but easier to see than previously. NEL=4.5 [approx.].) 2003 4 1.18 S 6.2 TJ 5.0B 7 4 6 GON Sierra del Aramo, Asturias (Comparison stars at the same low altitude as the comet.) 2003 4 1.16 S 6.7 HV 5.0B 7 3 7 0.6 345 BIV Poigny-la-Foret 2003 4 1.137 M 6.4 TK 8.0B 15 4 7/ 1.0 340 BOU Sint Annen 2003 3 31.81 S 6.5:HV 5.0B 7 4 7 BIV Ablis 2003 3 31.11 M 6.6 TK 5.0B 7 4.5 6 GRA Fjellhamar 2003 3 30.824 M 6.5 TK 8.0B 15 4.5 6 DIJ Sint Annen 2003 3 30.822 M 6.5 TK 8.0B 15 5.5 7/ BOU Sint Annen (Twilight. Observed at elevation of only 8 deg.) 2003 3 28.10 M 6.7 TK 5.0B 12 4 6 GRA Fjellhamar 2003 3 28.10 B 6.8 TK 15.2L 44 4 6 0.3 350 GRA Fjellhamar (Tail was faint and broad. NEL=4.8.) 2003 3 24.83 !S 6.6 TK 5.0B 7 5 6 BIV Ablis (In 25.6cm-L at 42x 0.3 deg. tail in p.a. 345 deg.) 2003 3 24.77 B 6.3 TJ 5.0B 10 5 6 GUZ Krosno 2003 3 24.77 B 6.3 TJ 20.3L 63 4 6 0.7 350 GUZ Krosno 2003 3 24.14 M 6.6 TK 5.0B 12 6 6 GRA Fjellhamar 2003 3 24.14 B 6.9 TK 15.2L 44 5.5 6/ 0.3 350 GRA Fjellhamar (With 15.2L, coma appeared blue-green with a bright central condensation and a false nucleus of approx. m2=9.0; tail was faint. With 12x50B, appearance similar to globulars M15 and M92. NEL=5.2.) 2003 3 23.812 M 6.6 TK 8.0B 15 4.5 7/ 1.0 348 BOU Westerdijkshorn 2003 3 23.812 B 6.4 TK 5.0B 7 2 7 JOH Gronau 2003 3 23.81 S 6.8 TK 5.0B 7 5 5 BIV Versailles 2003 3 22.92 M 6.5 TK 5.0B 12 6 6/ GRA Tryvann, Oslo (Altitude 11 deg. [lower culmination]. NEL=5.0 [approx.].) 2003 3 22.83 S 6.9 TK 5.0B 7 4 7 BIV Ablis 2003 3 22.823 B 6.4 TK 5.0B 7 2 7 JOH Lattrop 2003 3 22.808 M 6.6 TK 8.0B 15 7 6/ 0.9 350 DIJ Lauwersoog 2003 3 22.805 M 6.5 TK 8.0B 15 4 7 0.8 351 BOU Lauwersoog 2003 3 22.80 !B 6.3 TJ 5.0B 10 5 6 GUZ Krosno 2003 3 21.822 M 6.6 TK 8.0B 15 6.5 6 DIJ Sint Annen 2003 3 21.817 M 6.7 TK 8.0B 15 4 7 BOU Sint Annen 2003 3 21.76 B 6.4 TJ 5.0B 10 5 7 GUZ Krosno (Bright, condensed object.) 2003 3 21.13 M 6.7 TK 5.0B 12 5 6 GRA Fjellhamar 2003 3 20.84 S 6.7 TJ 5.0B 7 5 6 GON Alto del Castro - Aralla, Leon (Zodiacal Light. Comparison stars at the same low altitude as the comet.) 2003 3 20.78 B 6.4 TJ 5.0B 10 5 7 GUZ Krosno 2003 3 19.84 S 6.5 TJ 5.0B 7 7 5 GON Camposagrado, Leon 2003 3 18.811 M 6.7 TK 15.5L 30 5 5/ DIJ Groningen 2003 3 18.09 M 6.7 TK 15.2L 30 6 6 GRA Fjellhamar (Only faintly visible in 12x50B. Full Moon, NEL=4.5.) 2003 3 16.805 M 6.8 TK 15.5L 30 4.5 4/ DIJ Groningen 2003 3 15.808 M 6.8 TK 8.0B 15 4.5 7 BOU Noordwolde 2003 3 14.820 M 6.8 TK 15.5L 30 5 5/ DIJ Groningen 2003 3 14.21 B 6.9 TK 5.0B 7 4 6 BIV Pico-Veleta, Spain 2003 3 14.20 S 7.0 TK 20.3T 67 4 6 0.5 345 BIV Pico-Veleta, Spain 2003 3 14.169 M 6.7 TK 8.0B 15 5 7 0.4 349 BOU Thesinge (11d Moon 3 deg. over W-horizon. Comet strongly condensed with still a very faint tail visible in a very transparant sky.) 2003 3 13.20 S 7.3 TK 20.3T 67 5 5 0.3 345 BIV Pico-Veleta, Spain 2003 3 13.19 S 7.0 TK 5.0B 7 4 6 0.3 350 BIV Pico-Veleta, Spain 2003 3 13.172 M 6.8 TK 8.0B 15 5.5 6/ 0.6 348 BOU Sint Annen 2003 3 13.17 M 6.8 TK 5.0B 12 6 5 GRA Fjellhamar 2003 3 12.804 M 6.7 TK 15.5L 30 5 6 DIJ Groningen 2003 3 12.21 S 7.1 TK 20.3T 67 5 5 0.4 350 BIV Pico-Veleta, Spain 2003 3 12.21 S 7.1 TK 5.0B 7 4 6 BIV Pico-Veleta, Spain 2003 3 11.10 M 6.7 TK 5.0B 12 7 5 GRA Fjellhamar 2003 3 9.918 M 6.7 TK 15.5L 30 6 4 DIJ Groningen 2003 3 9.904 M 6.9 TK 8.0B 15 5 6 BOU Zuidwolde (Comet appearing well condensed. Moonlight.) 2003 3 9.83 S 7.0 TK 25.6L 42 3.5 6 BIV Villepreux 2003 3 9.82 S 7.0 TK 5.0B 7 5 5 BIV Villepreux 2003 3 9.22 S 7.1 TK 25.6L 42 4 5 BIV Versailles 2003 3 9.22 S 7.0 TK 5.0B 7 5 6 BIV Versailles 2003 3 9.15 S 6.7 TJ 5.0B 7 8 5 GON Camposagrado, Leon 2003 3 9.11 S 6.8 TJ 20.3T 77 5 5 GON Camposagrado, Leon 2003 3 7.830 M 6.7 TK 5.0B 7 8.5 4/ DIJ Noorddijk 2003 3 6.865 M 6.7 TK 5.0B 7 10 5 DIJ Noorddijk 2003 3 6.85 S 7.4 TK 25.6L 42 5 5 0.15 355 BIV Poigny-la-Foret 2003 3 6.84 S 7.2 TK 5.0B 7 6 6 BIV Poigny-la-Foret 2003 3 6.826 M 6.9 TK 8.0B 15 6 5/ BOU Zuidwolde 2003 3 4.01 S 6.9 TJ 5.0B 7 10 5 GON Sierra de Linares, Asturias 2003 3 2.83 S 7.3 TK 25.6L 42 8 4 0.2 330 BIV Poigny-la-Foret 2003 3 2.82 S 7.2 TK 5.0B 7 9 5 BIV Poigny-la-Foret 2003 3 2.79 S 6.7 TI 6.0B 20 9 4 RES Szamotuly 2003 3 2.058 M 7.2 TK 15.5L 30 5.2 4/ DIJ Groningen 2003 3 1.972 M 7.2 TK 8.0B 15 6 5/ BOU Groningen 2003 3 1.78 S 6.7 TI 6.0B 20 11 4 RES Szamotuly 2003 2 28.985 M 7.2 TK 8.0B 15 5.5 5 BOU Groningen 2003 2 28.94 M 7.1 TK 5.0B 7 9 5 GRA Tryvann, Oslo Clearly visible under a quite dark sky [NEL=6.0]. Its proximity to a mag. 7 star, however, made it somewhat challenging to obtain the formal observation.) 2003 2 27.14 M 7.3 TK 15.2L 30 8 5 GRA Fjellhamar 2003 2 27.021 S 7.5 TK 8.0B 15 & 6 5 COM Roden 2003 2 26.796 M 7.3 TK 8.0B 15 6.5 5/ 0.4 335 BOU Bedum (Tail very faint. General direction and length confirmed in 25.4-cmJ at 58x. In this instrument the tail appeared to consist of several very faint streamers, but this was very elusive.) 2003 2 26.74 M 7.1 TJ 5.0B 10 8 5 GUZ Krosno 2003 2 26.12 S 7.5 TK 5.0B 7 7 4 GRA Fjellhamar 2003 2 26.12 M 7.6 TK 15.2L 38 7 5 GRA Fjellhamar (Coma is bright at middle, its outer parts remain faint and diffuse. NEL=5.3. 2003 2 25.806 M 7.5 TK 8.0B 15 6.3 5 DIJ Bedum 2003 2 25.802 M 7.3 TK 8.0B 15 6.5 5 BOU Bedum 2003 2 25.76 S 7.0 TI 6.0B 20 12 4 RES Szamotuly 2003 2 25.74 M 7.1 TJ 5.0B 10 8 5 GUZ Krosno 2003 2 25.208 M 7.6 TK 8.0B 15 6 5/ COM Roden 2003 2 25.01 M 7.1 TJ 5.0B 10 8 5 GUZ Krosno 2003 2 24.965 M 7.6 TK 8.0B 15 5.4 5 DIJ Sint Annen 2003 2 24.962 M 7.4 TK 8.0B 15 6 5 BOU Sint Annen 2003 2 24.83 S 7.0 TI 6.0B 20 11 3 RES Szamotuly 2003 2 24.83 S 7.8 TK 25.6L 42 5 4 BIV Poigny-la-Foret 2003 2 24.82 S 7.7 TK 5.0B 7 6 5 BIV Poigny-la-Foret 2003 2 23.809 M 7.5 TK 8.0B 15 5.5 5 DIJ Westerdijkshorn 2003 2 23.806 M 7.4 TK 8.0B 15 7 5 BOU Westerdijkshorn 2003 2 23.76 S 6.9 TI 6.0B 20 15 3/ RES Szamotuly 2003 2 23.75 M 7.2 TJ 20.3L 63 6 5 GUZ Krosno 2003 2 23.75 M 7.1 TJ 5.0B 10 8 5 GUZ Krosno (Very bright object easily seen in binoculars despite light pollution.) 2003 2 22.89 S 7.0 TI 6.0B 20 14 4 RES Szamotuly 2003 2 22.790 M 7.6 TK 8.0B 15 5.5 5 DIJ Westerdijkshorn 2003 2 22.787 M 7.5 TK 8.0B 15 6 5 BOU Westerdijkshorn 2003 2 22.75 M 7.4 TJ 20.3L 63 6 5 GUZ Krosno 2003 2 22.75 M 7.2 TJ 5.0B 10 8 5 GUZ Krosno 2003 2 22.05 S 7.2 TI 6.0B 20 10 3/ RES Szamotuly 2003 2 21.91 M 7.3 TJ 5.0B 10 8 4 GUZ Krosno (Easily seen in binoculars despite light pollution.) 2003 2 21.90 M 7.5 TJ 20.3L 63 6 4 GUZ Krosno 2003 2 21.81 S 7.6 TK 25.6L 42 6.5 4 BIV Poigny-la-Foret 2003 2 21.81 S 7.6 TK 5.0B 7 10 3 BIV Poigny-la-Foret 2003 2 21.790 M 7.5 TK 8.0B 15 7.5 7 DIJ Westerdijkshorn 2003 2 21.786 M 7.6 TK 8.0B 15 6 5 BOU Westerdijkshorn 2003 2 21.04 M 7.7 TK 15.2L 38 7 4/ GRA Fjellhamar (The coma showed a bright disk at middle with fairly uniform brightness. Moon and thin clouds. NEL=5.1.) 2003 2 20.94 S 8.1 TJ 20.3T 77 5 5 GON Sierra del Aramo, Asturias 2003 2 20.93 S 7.7 TJ 8.0B 11 6 3 GON Sierra del Aramo, Asturias 2003 2 20.85 S 7.8 TK 25.6L 42 6 3 BIV Poigny-la-Foret 2003 2 20.82 S 7.8 TK 5.0B 7 8 4 BIV Poigny-la-Foret 2003 2 20.790 M 7.6 TK 8.0B 15 6.5 4/ BOU Sint Annen 2003 2 20.05 M 7.6 TK 15.2L 38 8 4/ GRA Fjellhamar (The inner 3' of the coma was quite bright [mag. 8.7, TK], it was surrounded by a very diffuse outer coma. Moonlight, NEL=5.1.) 2003 2 16.769 S 7.9 TK 8.0B 15 5 3/ BOU Sint Annen (Moonlight. Comet at elevation of 25 deg.) 2003 2 16.22 S 7.8 TJ 8.0B 11 4 3 GON Camposagrado, Leon (Moonlight.) 2003 2 14.219 M 7.8 TK 8.0B 15 7.5 6 DIJ Sint Annen 2003 2 14.213 S 7.9 TK 8.0B 15 8 3/ BOU Sint Annen (Moon 6 deg. over W-horizon.) 2003 2 14.19 S 7.7 TK 5.0B 12 8 3/ GRA Fjellhamar 2003 2 14.19 S 7.8 TK 15.2L 44 7 4 GRA Fjellhamar (Diffuse. Not too hard to see with 12x50B. NEL=5.2.) 2003 2 14.04 S 7.7:TI 6.0B 20 & 8 2/ RES Szamotuly (Nearby star [GSC 3896-1507 6.4 mag] so parameters uncertain. Moonlight.) 2003 2 13.211 S 8.2 TK 8.0B 15 & 6 4/ COM Roden 2003 2 13.02 S 7.7 TI 6.0B 20 10 2/ RES Szamotuly (Moonlight.) 2003 2 12.98 S 7.9 TJ 5.0B 10 8 3 GUZ Krosno 2003 2 12.03 S 8.0 TI 6.0B 20 9 2/ RES Szamotuly (Moon low at West [alt. about 19 deg.].) 2003 2 8.05 S 8.5 TJ 5.0B 7 6 4 GON Camposagrado, Leon (NEL=6.0 near comet.) 2003 2 6.225 S 9.1 TK 8.0B 15 & 6 4/ COM Roden 2003 2 6.167 S 8.8 TK 25.4J 47 5.5 4/ BOU Sint Annen 2003 2 6.12 S 8.4 TK 15.2L 38 6 3 GRA Fjellhamar (Diffuse coma, only barely brighter than the sky background [NEL=4.8].) 2003 2 5.18 S 8.7 TK 5.0B 7 7 5 BIV Poigny-la-Foret 2003 2 5.12 S 8.9 TK 25.6L 42 6 4 BIV Poigny-la-Foret 2003 2 4.17 S 9.6 TK 25.6L 42 5 4 BIV Versailles 2003 2 3.010 M 9.0 TK 25.4J 47 5 4 BOU Sint Annen 2003 2 2.95 S 9.0 TJ 5.0B 10 5 3 GUZ Krosno 2003 2 1.95 S 8.5 AC 6.0B 20 12 2 RES Szamotuly 2003 2 1.004 M 9.2 TK 8.0B 15 5 6 DIJ Sint Annen 2003 2 1.001 S 9.2 TK 8.0B 15 6.5 4 BOU Sint Annen (Comet impressive in 31.0-cmJ, quite a difference with the view only 6 days ago!) 2003 1 31.97 S 8.8 AC 6.0B 20 10 2 RES Szamotuly 2003 1 30.95 S 9.3 TK 5.0B 12 6 3 GRA Hågår obs., Eina 2003 1 30.95 M 9.4 TK 25.4L 50 6 3/ GRA Hågår obs., Eina (With 12x50B. faintly visible, it was larger but more difficult to see than M97. With 25.4-cmL: Very diffuse coma of low surface brightness but clearly seen with this instrument. The appearance of this comet was similar to C/2002 V1 on Dec. 24, 2002. Dark sky [NEL=6.5].) 2003 1 30.25 S 10.9:TK 25.6L 84 2.5 3 BIV Versailles 2003 1 28.01 S 10.3 TJ 20.3T 77 3 3 GON Camposagrado, Leon 2003 1 27.25 S 9.9 TK 15.2L 44 3.5 3 GRA Fjellhamar (Comet was barely visible. Its angular extent was similar to M97, although the latter object was clearly brighter. Moon and astronomical twilight, NEL = 5.3.) 2003 1 26.010 S 10.5 TK 31.0J 58 2 3 DIJ Sint Annen 2003 1 26.003 S 10.5 TK 31.0J 58 3.2 2 BOU Sint Annen 2003 1 9.198 S 12.5 TK 31.0J 89 1.6 1 DIJ Sint Annen 2003 1 9.194 S 12.5 TK 31.0J 89 2.0 2/ BOU Sint Annen