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Note number : 0132 P/Hartley-IRAS : 161P

• Introduction
• Elements
• Formulæ for magnitudes
• Elements for the next transit through perihelion
• Elements for the previous transit(s) through perihelion

• Comparison with observations
• Ephemerides of the comet  (ou click to open TEXT file TEXTE)
• Load the Postscript file of the note

Introduction

The following improved orbital elements, are from 365 observations 1983 November 4 to 2005 October 12, including full planetary and non-gravitational effect of type II, but not the relativity effect of the Sun.

The mean residual is 0.72 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2005 June 9 at 0h TT, julian day 2453530.5.

Perihelion passage (T)	2005 June 20.84470 TT	±0.00002 TT
Argument of perihelion (ω)	47.0759172°	±0.0000264°
>Longitude of the node (Ω)	1.3973098°	۪.0000272°
Inclinaison (i)	95.6982381°	±0.0000294°
Perihelion distance (q)	1.2751362 ua	±0.0000005 ua
Eccentricity (e)	0.8350470	±0.0000024
Semimajor axis (a)	7.7303025 ua	±0.0001166 ua
Mean motion (n)	0.04585739°/jour	±0.00000104°/jour
Period (P)	21.493 years	±0.0004862 (0.1776 day)

Non-gravitational parameters :

A₁ = 0.96147 .10^-8 ±0.04886 .10^-8
A₂ = -0.61107 .10^-8 ±0.02970 .10^-8

Formulæ for magnitudes

Total magnitude :
m₁ = H₁ + 5log(Δ) + 10 log(r) avec H₁ = 12.00± 0.23 calculé à l'aide de 32 observation(s).
Nuclear magnitude :
m₂ = H₂ + 5log(Δ) + 5 log(r) avec H₂ = 13.94±0.04 calculé à l'aide de 167 observation(s).

Elements for the next transit through perihelion

Epoch :2026 December 18 at 0h TT, julian day 2461392.5 TT.

T =2026 November 21.59319 TT.
q :1.2651552 ua	(J2000)	P	Q
n : 0.04598740°/jour	ω : 47.0643445°	+0.68285369	-0.73010564
a : 7.7157260 ua	Ω : 1.4758443°	-0.34140661	-0.34992719
e : 0.8360290	i : 95.7924550°	+0.64587333	+0.58693843
P =21.43 years

Elements for the previous transit(s) through perihelion

Epoch :1984 January 8 at 0h TT, julian day 2445707.5 TT.

T =1984 January 8.70925 TT.
q :1.2824500 ua	(J2000)	P	Q
n : 0.04595933°/jour	ω : 47.1150542°	+0.68220951	-0.73069352
a : 7.7188673 ua	Ω : 1.4986466°	-0.34079200	-0.34926471
e : 0.8338552	i : 95.7319598°	+0.64687789	+0.58660135
P =21.45 years

Contact

Send your suggestion to the author of the notes : Patrick Rocher

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