117P/Helin-Roman-Alu 1 (1997)

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Total 6,336 html files since Dec. 4, 1995 Updated on December 2, 2007

Profile

Orbital Elements The following improved orbital elements by Kenji Muraoka, are from 177 observations 1988 to 1999, perturbations by 9 Plantes, Moon and 5 minor planets were taken into account. The mean residual is +/- 0.74 arc seconds. Epoch = 1997 Mar. 13.0 TT JDT = 2450520.5 T = 1997 Mar. 26.87668 +/- 0.00096 (m.e.) TT Peri. = 215.07749 +/- 0.00013 Node = 73.47253 +/- 0.00010 (2000.0) Incl. = 9.74249 +/- 0.00002 q = 3.7148304 +/- 0.0000007 AU e = 0.1756999 +/- 0.0000001 a = 4.5066477 +/- 0.0000003 AU n = 0.10302050 +/- 0.00000001 P = 9.567 +/- 0.0000008 years

Finding Charts

Magnitudes Graph m1 = -0.5 + 5 log d + 25.0 log r(t - 300)

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.