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* * * * * 96P/Machholz 1 * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2023 2 17.24 S 8.8 TK 20.3T 100 1.7 3 0.15 290 GON Cueto Rosales, León (Altitude 7°. Comparison stars at the same low altitude as the comet.) 2023 2 7.27 S 7.7 TK 20.3T 100 2 3 GON Alto del Trichero - Soto y Amío, León (Altitude 6°. Beginning of nautical twilight. Comparison stars at the same low altitude as the comet. Very clear sky down to the horizon.)
2017 10 13.39 S 11.6 AQ 25.0L 83 1 3/ WYA Walcha, NSW (Does not enhance in Swan Band filter. Low altitude 5.6°.) 2017 10 12.38 S 11.5 AQ 25.0L 83 1.3 3/ WYA Walcha, NSW (Low altitude 8.5°. Slight twilight interference. Does not enhance in Swan Band filter.)
2012 9 13.85 S 10.8 TK 20.3T 100 4 1/ GON Alto del Castro, León (Altitude 15°. Mountain location, very clear sky.) 2012 8 21.88 S 10.5 TK 20.3T 77 6 2/ GON Alto del Castro, León 2012 8 19.83 M 11.8 TK 20.3L 63 1.5 3 GUZ Szklary 2012 8 18.86 S 11.3 TK 40.7L 58 3 2 BIV 2012 8 17.85 S 11.3 TK 40.7L 58 3 3 BIV 2012 8 16.87 S 11.0 TK 40.7L 58 3.5 3 BIV 2012 8 14.86 S 11.5 TK 40.7L 58 3.5 4 BIV 2012 8 13.86 S 10.4 TK 40.7L 58 3 4 BIV 2012 8 9.89 S 10.2 TK 20.3T 100 2.5 4 GON Alto del Castro, León (Coma elongated in p.a. 80 deg. Altitude 19°.) 2012 7 26.915 aS 8.7 TK 31.0J 58 2 4/ BOU Sint Annen 2012 7 26.906 S 8.5 TK 15.5L 29 2 4/ DIJ Burlage 2012 7 23.84 M 8.1 TK 20.3L 63 1.5 5 GUZ Szklary (Altitude: 6°. Comparison stars at the same altitude.) 2012 7 22.88 S 7.8 TK 20.3T 77 1.5 5 0.1 60 GON Alto del Castro, León (Altitude 9°. End of nautical twilight. Comparison stars at the same low altitude as the comet. Nearby stars down to 10.5 magnitude were visible.) 2012 7 22.84 M 7.8 TK 20.3L 63 1.5 6 GUZ Krosno (Altitude 6°. Comparison stars at the same altitude. Coma slightly elongated in p.a. ~60 deg.) 2012 6 30.37 S 9.6 AU 22.0L 160 2 4 GOI Araçatuba (Nautical twilight, Sun altitude -13°, comet altitude 11°. Comparison stars at the same altitude of the comet.) 2012 6 24.78 S 13.3 AQ 25.0L 156 0.5 2 WYA Walcha, NSW (No tail, very faint and diffuse, small coma, barely noticeable central condensation, motion checked over a 30 minute period.) 2012 6 17.36 S 12.1:AU 22.0L 160 1 5 GOI Araçatuba (Transition between astronomical and nautical twilight, comet altitude 24°.)
2007 6 26.08 S 13.7 TA 20.3T 160 0.7 4 GON Alto del Trichero - Soto y Amío, León 2007 5 26.72 S 12.8 TA 40.0L 144 0.8 3 YOS Kita-karuizawa, Gunma (It was located in a dense area of background stars. Faint diffuse nebulous object was visible among them. Unexpectedly, it seems still bright and visible visually.) 2007 5 18.006 S 12.4 AU 31.0J 89 2.6 0/ DIJ Sint Annen 2007 5 18.004 S 12.3 AU 31.0J 89 2.1 1 BOU Sint Annen (Comet just a fairly large, but very diffuse glow.) 2007 5 9.05 S 10.9 TK 20.3T 100 1.5 4 GON Alto del Castro - Aralla, León (Mountain location, very clear sky. Altitude 15°.) 2007 4 29.76 S 10.9 TJ 40.0L 144 1.6 5 YOS Kita-karuizawa, Gunma 2007 4 28.76 S 10.7 TJ 40.0L 75 2.2 5/ YOS Kita-karuizawa, Gunma (I was surprised that the comet was much brighter, and much more strongly condensed than I had expected. More strongly condensed than Comet Lovejoy. Easy to see. I thought this comet becomes only bright near the sun, and fades out soon after the perihelion passage. But actually, it was located high and very easy to see.) 2007 4 22.17 S 8.8 TK 10.0B 25 3 6 0.1 290 GON Collada de la Cobertoria, Lena, Asturias 2007 4 20.07 S 9.1 TK 20.3T 77 2.0 4 GRA Fjellhamar (Faint, but seen at correct location. Altitude 9°. and astronomical twilight [solar altitude -13°.].) 2007 4 18.16 M 8.2 TK 10.0B 25 3 6 GON Puerto de Aralla, León (Mountain location, clear sky. Altitude 11°.) 2007 4 17.09 S 8.5 TK 20.3T 100 1.5 5 GRA Fjellhamar (Comet only barely visible, but it was detected at the correct location. Nearby stars down to 11th magnitude were visible. Altitude 9°. and solar altitude -12°.) 2007 4 16.117 S 7.9 TK 15.6L 36 3.1 6 DIJ Sint Annen 2007 4 16.115 S 8.3 TK 15.6L 36 2.8 4/ BOU Sint Annen 2007 4 16.108 S 8.3 TK 10.0B 14 3 6 LOO Grand Bois, Vielsalm 2007 4 15.127 S 7.8 TK 15.6L 36 3 5 DIJ Sint Annen (Very low and difficult due to bright morning sky.) 2007 4 15.124 S 8.0 TK 15.6L 36 3 4 BOU Sint Annen (Comet low [altitude 8°] in twilight.) 2007 4 14.10 I [8.5 TK 7.0R 20 GRA Fjellhamar (Comet not seen near its ephemeris location. Faintest visible stars near comet were the pair HD 225150 and HD 225138. Altitude 7° and solar altitude -12°.) 2007 4 13.18 M 7.2 TK 10.0B 25 3 6 GON Alto de Rosales, León (Mountain location, very clear sky. Astronomical twilight.) 2007 4 11.11 I [6.0 TK 7.0R 20 GRA Fjellhamar (No object was detected close to 96P's predicted location. The limiting magnitude is based on the visibility of nearby stars. Altitude 5° and solar altitude -11°.)
2001 12 17.48 S 13.5:HS 27.5T 156 0.5 3 MAT Wallaroo, SA (Observation made at 10 degrees altitude.) 2001 12 16.48 S 13.5:HS 27.5T 156 0.5 3 MAT Wallaroo, SA (Comet is a magnitude fainter than the ephemeris. However, observation was made at 10 degrees altitude.)