Comet 78P/GEHRELS 2

2004(-2005):

Sep. 08.96: m1 = 12.8 (+/-0.2) Dia.= 1.0', DC = 6, 116x40.7L, Ablis (F)

Sep. 15.14: m1 = 12.3 (+/-0.2) Dia.= 1.3', DC = 7, 42x25.6L, Poigny/G (F)

Sep. 17.10: m1 = 12.2 (+/-0.2) Dia.= 1.3', DC = 7, 58x40.7L, Ablis (F)

Sep. 24.13: m1 = 12.0 (+/-0.2) Dia.= 1.2', DC = 6, 42x25.6L, Poigny/G (F)

Oct. 06.92: m1 = 11.6 (+/-0.2) Dia.= 1.3', DC = 6, 84x25.6L, Poigny/G (F)

Oct. 12.99: m1 = 11.5 (+/-0.1) Dia.= 1.4', DC = 5, 42x25.6L, Poigny/G (F)

Oct. 16.02: m1 = 11.5 (+/-0.1) Dia.= 1.5', DC = 6, 42x25.6L, Poigny/G (F)

Oct. 18.92: m1 = 11.5 (+/-0.2) Dia.= 1.5', DC = 6, 116x40.7L, Poigny/G (F)

Oct. 21.19: m1 = 11.2 (+/-0.2) Dia.= 1.6', DC = 6, 42x25.6L, Poigny/G (F)

Nov. 14.95: m1 = 10.8 (+/-0.2) Dia.= 1.5', DC = 6, 42x25.6L, Poigny/G (F)

Dec. 08.91: m1 = 10.7 (+/-0.3) Dia.= 2.0', DC = 5, 42x25.6L, Poigny/G (F)

Dec. 11.93: m1 = 10.4 (+/-0.3) Dia.= 3.0', DC = 5, 40x20.3L, Poigny/G (F)

Dec. 12.92: m1 = 10.4 (+/-0.3) Dia.= 2.0', DC = 6, 40x20.3L, Poigny/G (F)

Dec. 16.98: m1 = 10.7 (+/-0.2) Dia.= 2.5', DC = 5, 42x25.6L, Poigny/G (F)

Dec. 18.02: m1 = 11.0 (+/-0.2) Dia.= 2.0', DC = 5, 42x25.6L, Poigny/G (F)

Dec. 20.09: m1 = 11.2 (+/-0.2) Dia.= 2.0', DC = 5, 42x25.6L, Poigny/G (F)

Sep. 08.96: tail = 0.03°, PA= 260°

Sep. 15.14: m1 ~ 14.0 169x25.6L, tail = 0.05°, PA= 270°

Sep. 17.10: m1 = 13.9 (+/-0.2) 233x40.7L, tail = 0.06°, PA= 270°

Sep. 24.14: m1 ~ 14.5 169x25.6L, tail = 0.06°, PA= 270°

Oct. 06.92: m1 = 13.8 (+/-0.3) 169x25.6L, tail = 0.04°, PA= 260°

Oct. 12.99: tail = 0.06°, PA= 270°

Oct. 16.02: m1 = 13.8 (+/-0.2) 169x25.6L, tail = 0.07°, PA= 260°

Oct. 18.93: m1 = 13.4 (+/-0.2) 233x40.7L, tail = 0.04°, PA= 270°

Oct. 21.19: m1 = 13.7 (+/-0.3) 169x25.6L, tail = 0.05°, PA= 270°

Nov. 14.96: m2 = 13.2 (+/-0.2) 169x25.6L, tail = 0.06°, PA= 270°

Dec. 08.92: m2 = 14.4 (+/-0.2) 169x25.6L

Dec. 16.99: m2 = 14.6 (+/-0.2) 169x25.6L

Dec. 18.02: m2 = 14.7 (+/-0.2) 169x25.6L

1997-1998 :

Nov. 23.44: m1 = 12.0 (+/-0.3) Dia.= 1.2', DC = 6, 84x256 L, Silva (HI)

Nov. 27.61: m1 = 12.1 (+/-0.2) Dia.= 1.3', DC = 6, 84x256 L, Koko-H (HI)

Nov. 30.44: m1 = 12.0 (+/-0.2) Dia.= 1.2', DC = 7, 84x256 L, Dilli. (HI)

Dec. 06.57: m1 = 11.9 (+/-0.2) Dia.= 1.5', DC = 5, 84x256 L, Koko-H (HI)

Dec. 08.58: m1 = 12.3 (+/-0.2) Dia.= 1.0', DC = 5, 84x256 L, Koko-H (HI)

Dec. 22.33: m1 = 12.5 (+/-0.1) Dia.= 1.3', DC = 4, 84x256 L, Koko-H (HI)

Dec. 24.48: m1 = 12.3 (+/-0.3) Dia.= 1.0', DC = 4, 84x256 L, Koko-H (HI)

Dec. 25.35: m1 = 12.4 (+/-0.3) Dia.= 1.0', DC = 5, 84x256 L, Koko-H (HI)

Dec. 27.41: m1 = 12.9 (+/-0.2) Dia.= 1.5', DC = 4, 84x256 L, Silva (HI)

Dec. 28.41: m1 = 12.2 (+/-0.2) Dia.= 1.3', DC = 5, 84x256 L, Dilli. (HI)

Jan. 17.31: m1 = 12.5 (+/-0.3) Dia.= 1.4', DC = 4, 84x256 L, Koko-H (HI)

Jan. 19.27: m1 = 13.0 (+/-0.2) Dia.= 1.0', DC = 3, 84x256 L, Koko-H (HI)

Jan. 20.42: m1 = 12.9 (+/-0.2) Dia.= 1.5', DC = 3, 84x256 L, Silva (HI)

Feb. 17.34: m1 = 13.8 (+/-0.2) Dia.= 0.6', DC = 4, 169x256 L, Silva (HI)

Feb. 24.40: m1 = 14.2 (+/-0.3) Dia.= 0.7', DC = 2, 169x256 L, Silva (HI)

Comments: Brightness fluctuations were in the GSC... Controled thanks to the newly available Hipparcos-Tycho Catalog (Dec. 3). Hint of a 1' tail in PA 250. Late December: slightly fading. Feb.17-24: Last observations, m1=14 is the very limit for such observations with a 25.6cm (unless coatings are improved). See you in 2004?