78P/Gehrels 2 (1997)

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Profile

Orbital Elements The following improved orbital elements by Kenji Muraoka, are from 400 observations 1973 to 1998, including 9 Planets, Moon and 5 minor planets perturbations and non-gravitational effect of style II. The mean residual is +/- 0.66 arc seconds. Epoch = 1997 Aug. 20.0 TT JDT = 2450680.5 T = 1997 Aug. 7.04307 +/- 0.00061 (m.e.) TT Peri. = 192.76856 +/- 0.00023 Node = 210.62727 +/- 0.00010 (2000.0) Incl. = 6.25771 +/- 0.00001 q = 2.0002621 +/- 0.0000026 AU e = 0.4635823 +/- 0.0000007 a = 3.7289264 +/- 0.0000018 AU n = 0.13687633 +/- 0.00000010 P = 7.201 +/- 0.0000053 years A1 = -0.587 +/- 0.055 A2 = -0.04547 +/- 0.00164

Finding Charts 1996 May 7 - 1997 June 11 1997 June 11 - 1998 Aug. 25

Magnitudes Graph m1 = 1.3 + 5 log d + 31.5 log r [ , 0] ( - 1997 Aug. 7) m1 = 8.0 + 5 log d + 10.0 log r [ 0,250] (1997 Aug. 7 - 1998 Apr. 14) m1 = 2.3 + 5 log d + 23.0 log r [250, ] (1998 Apr. 14 - )

The orbital elements are calculated by Kenji Muraoka. The charts are made with StellaNavigator Ver.2.0 for Windows (AstroArts / ASCII). The magnitudes graphs are made with Comet for Windows.