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* * * * * 217P/LINEAR * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2017 9 25.74 S[14.0 AU 40.0L 257 !0.5 YOS Kita-karuizawa, Gunma (Unexpectedly, not visible. Probably involved with a nearby 14th mag star.) 2017 9 21.76 S 13.9 AQ 25.0L 166 0.8 3 WYA Walcha, NSW (Visible in periods of good seeing. Difficult, close to stars.) 2017 9 1.77 S 13.6 AQ 25.0L 83 0.9 3 WYA Walcha, NSW (Coma diffuse. Close to stars.) 2017 8 30.72 S 12.9 AQ 25.0L 83 1 3 WYA Walcha, NSW (Coma diffuse. Low altitude 15.1°.) 2017 8 21.12 S 12.2 AQ 20.3T 133 2 3 GON Alto del Castro - Aralla, León (Field stars checked in DSS. Altitude 18°.) 2017 8 19.74 S 12.8 AQ 25.0L 83 1 3 WYA Walcha, NSW (Coma diffuse, slight brightening to centre. Low altitude 18.6°.) 2017 8 1.82 S 12.0 AQ 40.6L 76 1.8 3 CAM Katherine, NT 2017 8 1.76 M 12.6 AQ 25.0L 83 1 6 WYA Walcha, NSW (Does not enhance in Swan Band filter. Coma slightly elongated to NW approximately.) 2017 7 30.81 S 12.0 AQ 40.6L 76 2.0 3 CAM Katherine, NT 2017 7 27.80 S 12.1 AQ 40.6L 76 1.8 3/ CAM Katherine, NT 2017 7 25.79 M 12.2 AQ 25.0L 83 1.4 5/ WYA Walcha, NSW (Coma diffuse, opaque centre with a faintly stellar central condensation. Does not enhance in Swan Band filter.) 2017 7 24.81 S 12.0 AQ 40.6L 165 2.0 4 CAM Katherine, NT 2017 7 24.78 S 12.1 AQ 25.0L 39 2.5 5/ WYA Walcha, NSW (Coma does not enhance in Swan Band filter. Slight interference by zodiacal light.) 2017 7 22.81 S 12.0 AQ 40.6L 165 2.0 4 CAM Katherine, NT 2017 7 5.79 M 12.2 AQ 25.0L 39 2.2 5/ WYA Walcha, NSW (Coma does not enhance in Swan Band filter. Central condensation sometimes stellar in good seeing. Slight interference from zodiacal light and Venus glare.) 2017 6 30.73 M 13.0 AQ 25.0L 83 0.7 4/ WYA Walcha, NSW (Coma diffuse with moderately condensed centre. Hint of a tail to the WSW. Low altitude 16.9°.) 2017 6 24.81 S 13.3 AQ 40.6L 165 2.0 3 CAM Katherine, NT 2017 6 22.75 M 13.3 AQ 25.0L 83 0.8 5/ WYA Walcha, NSW (Coma diffuse, opaque with small central condensation, almost stellar. Slightly elongated to the South-East approximately.) 2017 6 21.81 S 13.0 AQ 40.6L 260 1.0 3 CAM Katherine, NT 2017 6 18.81 S 13.2 AQ 40.6L 260 0.8 2 CAM Katherine, NT (Moonlight.)
2010 2 2.88 S 13.5 HN 20.3T 133 1.2 5 GON Camposagrado, León (Comparison stars taken from Henden photometry near V650 Ori.) 2010 1 12.92 S 12.7 TK 20.3T 133 1.2 5 GON Grandota - Oviedo, Asturias 2009 12 12.99 V 12.5 TK 10.9R 2.8 QVA Borrevannet, Horten 2009 12 12.02 S 11.7 TK 20.3T 133 1.5 4 GON Alto del Castro, León 2009 11 24.03 S 11.2 TK 20.3T 133 1.2 3 GON Alto del Castro, León 2009 11 18.913 S 10.4 TK 8.0B 15 2.5 2/ DIJ Burlage 2009 11 18.08 S 10.7 TK 20.3T 100 1.2 3 GON Alto del Castro, León 2009 10 26.08 S 10.3 TK 20.3T 77 2.5 5 0.1 280 GON Alto del Castro, León 2009 10 17.990 S 10.1 TK 8.0B 15 3 3/ DIJ Burlage 2009 10 17.10 S 10.1 TK 40.0L 106 2.5 4 0.15 285 BIV La Palma, Canary Islands, Spain 2009 10 16.19 S 9.9 TK 40.0L 67 2.0 5 0.1 280 BIV La Palma, Canary Islands, Spain 2009 10 16.10 S 10.1 TK 20.3T 77 2.5 5/ 0.1 290 GON Alto del Castro, León (The comet shows a brighter inner coma after the recent minor outburst, without a notable increase in the total visual magnitude till now.) 2009 10 15.11 S 10.0 TK 40.0L 106 2.0 5 0.15 280 BIV La Palma, Canary Islands, Spain 2009 10 15.09 M 9.5 TK 10.0R 25 3 3/ GRA Fjellhamar 2009 10 14.996 S 10.1 TK 8.0B 15 3 3/ DIJ Burlage 2009 10 14.06 I 9.8 TK 5.0R 19 GRA Fjellhamar 2009 10 14.06 M 9.7 TK 20.3T 83 2.0 5 GRA Fjellhamar 2009 10 14.06 M 9.6 TK 10.0R 25 2 5 GRA Fjellhamar (This comet appeared as a quite compact object with a similar surface brightness as the Crab Nebula. It was also seen through the Galileoscope, although only as an apparently stellar object. Altitude 19 degrees. The conditions were favourable for this near Oslo location [NEL approx. 5.5]. 217P was also seen next morning, but I was not able to detect it two weeks later [Oct. 29.1 UT] under similar conditions.) 2009 10 13.09 S 10.5 TK 40.0L 67 2.0 3 0.17 270 BIV La Palma, Canary Islands, Spain 2009 9 29.13 S 9.9 TK 20.3T 77 3.5 5 0.2 280 GON Alto del Castro, León 2009 9 26.01 S 9.8 TK 13.0L 85 2 4 1.5m SID Korenovsk 2009 9 25.026 S 10.2 TK 8.0B 15 4 3/ DIJ Burlage 2009 9 24.73 S 9.9 GA 10.0B 25 4 SEA Cowra, NSW 2009 9 24.72 S 10.2 GA 25.4L 71 3 0.17 270 SEA Cowra, NSW (Less clearly visible using Swan band filter.) 2009 9 23.14 S 9.8 TK 20.3T 77 4 5 0.2 280 GON Alto del Castro, León 2009 9 20.75 S 10.2 TJ 40.0L 36 4.0 7 8m 255 YOS Kita-karuizawa, Gunma (Beautiful comet with a wide parabolic dust tail. Excellent view!) 2009 9 18.01 S 10.8 TK 13.0L 85 1.2 5 1.2m SID Korenovsk 2009 9 17.049 S 10.1 TK 8.0B 15 2.5 4 DIJ Burlage 2009 9 1.097 S 10.1 TK 8.0B 15 4 3 DIJ Burlage 2009 9 1.083 S 10.1 TA 31.0J 58 3 4 BOU Lauwersoog (At 109x, faint tail visible about 5' long in p.a. 255 deg.) 2009 8 31.15 S 9.9 TK 20.3T 77 4 5 0.2 270 GON Alto del Castro, León 2009 8 31.15 S 11.0 TK 40.7L 58 1.5 6 BIV Versailles 2009 8 30.14 S 10.2 TK 40.7L 58 2 5 BIV Versailles 2009 8 29.16 S 10.2 TK 20.3T 77 3 5 GON Alto del Castro, León 2009 8 19.10 S 10.1 TK 20.3T 77 4 4 0.1 270 GON Alto del Castro, León 2009 7 25.09 S 11.3 TK 20.3T 100 1.2 5 GON Alto del Castro, León (Elongated coma.) 2009 7 24.10 S 11.4 TK 20.3T 100 1.5 5 GON Alto del Castro, León 2009 7 19.07 S 11.6 TK 20.3T 100 1.5 5 GON Alto del Castro, León 2009 7 18.10 S 11.5 TK 20.3T 133 1.3 5 GON Alto del Castro, León 2009 7 3.11 S 13.1 TA 20.3T 133 1.2 5 GON Alto del Castro, León 2009 6 21.10 S 13.8 TA 20.3T 206 0.6 6 GON Alto del Castro, León (Nearby field stars checked in DSS. Comparison stars taken from TASS photometry.) 2009 5 27.12 S 14.6 HN 20.3T 206 0.6 6 GON Alto del Castro - Aralla, León (Mountain location, very clear sky. Nearby field stars checked in DSS. Comparison stars taken from Henden photometry near UU Aqr.)
2002 2 2.772 S 13.8 HS 31.0J 109 0.9 1/ DIJ Lauwersoog 2002 2 2.768 S 13.5 HS 31.0J 109 1.1 3 BOU Lauwersoog 2002 1 13.750 S 12.8 SK 31.0J 89 1.0 2/ DIJ Lauwersoog 2002 1 13.744 S 12.5 SK 31.0J 89 1.3 4 BOU Lauwersoog 2001 12 17.49 S 12.8 HS 27.5T 88 1.0 4 MAT Wallaroo, SA 2001 12 17.48 S 11.9 GA 10.0B 25 SEA Cowra, NSW 2001 12 16.731 aS 12.0 AC 31.0J 89 1.1 1/ DIJ Lauwersoog 2001 12 16.724 aS 11.7 AC 31.0J 89 1.3 4 BOU Lauwersoog (Comet well visible, despite altitude of only 14 deg. Comparison stars were used from AAVSO-chart of V1494 Aql, based on sequence by Henden.) 2001 12 16.56 S 12.7 HS 27.5T 88 1 4 MAT Wallaroo, SA 2001 12 15.50 S 12.9 HS 27.5T 88 1 4 MAT Wallaroo, SA 2001 12 9.50 S 12.5:HS 27.5T 88 1.5 5 MAT Wallaroo, SA (GSC comparisons 12.6,12.8. USNO V mag comparison gives comet m1=11.7, GSPC comparison is around 12.0. Also visible in 40x100mm binoculars.) 2001 12 6.52 S 12.5:HS 27.5T 88 1.4 5 MAT Wallaroo, SA (GSC comparisons 10.8,12.4. GSC mags in this region are poor. USNO V mag comparison gives comet m1=11.9.) 2001 11 13.45 S 12.7 GA 25.4L 71 SEA Cowra, NSW 2001 11 12.44 S 12.7 GA 25.4L 71 1 SEA Cowra, NSW 2001 11 11.46 S 12.8 GA 25.4L 114 SEA Cowra, NSW (Comet must have brightened considerably since my previous (unsuccessful) attempt Oct. 19. It was quite conspicuous at both 114x and 71x.) 2001 11 9.53 S 13.7 HS 27.5T 88 0.8 5 MAT Wallaroo, SA 2001 11 6.49 S 13.8 HS 27.5T 156 0.8 5/ MAT Wallaroo, SA 2001 11 2.45 S 13.8:HS 27.5T 156 0.8 4/ MAT Wallaroo, SA (Moonlight.) 2001 10 16.53 S 14.1 HS 27.5T 88 0.6 5 MAT Wallaroo, SA 2001 10 14.47 S 14.2 HS 27.5T 88 0.7 4/ MAT Wallaroo, SA (First reliable observation; small but rather moderately condensed.) 2001 10 8.54 [14.0 27.5T 88 MAT Wallaroo, SA 2001 10 7.50 [14.0 27.5T 88 MAT Wallaroo, SA 2001 9 16.48 [13.5 30.0L 170 MAT Blinman, SA 2001 9 9.53 [13.0 20.0L 160 MAT Wallaroo, SA