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Note number : 0013 P/Giacobini-Zinner : 21P

• 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 1165 observations 1998 January 20 to 2006 March 26, including full planetary and non-gravitational effect of type II, and relativity effect of the sun.

The mean residual is 0.45 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2005 July 2 at 0h TT, julian day 2453553.5.

Perihelion passage (T)	2005 July 2.75998 TT	±0.00000 TT
Argument of perihelion (ω)	172.5424334°	±0.0000174°
>Longitude of the node (Ω)	195.4298817°	۪.0000136°
Inclinaison (i)	31.8111717°	±0.0000055°
Perihelion distance (q)	1.0379162 ua	±0.0000002 ua
Eccentricity (e)	0.7056889	±0.0000004
Semimajor axis (a)	3.5265960 ua	±0.0000057 ua
Mean motion (n)	0.14882315°/jour	±0.00000036°/jour
Period (P)	6.623 years	±0.0000159 (0.0058 day)

Non-gravitational parameters :

A₁ = 0.23228 .10^-8 ±0.00249 .10^-8
A₂ = -0.05690 .10^-8 ±0.00254 .10^-8
A₃ = -0.09336 .10^-8 ±0.00200 .10^-8

Formulæ for magnitudes

Total magnitude :
m₁ = H₁ + 5log(Δ) + 10 log(r) avec H₁ = 11.08± 0.03 calculé à l'aide de 346 observation(s).
Nuclear magnitude :
m₂ = H₂ + 5log(Δ) + 5 log(r) avec H₂ = 12.48±0.05 calculé à l'aide de 176 observation(s).

Elements for the next transit through perihelion

Epoch :2012 February 11 at 0h TT, julian day 2455968.5 TT.

T =2012 February 11.82393 TT.
q :1.0304870 ua	(J2000)	P	Q
n : 0.14938826°/jour	ω : 172.6025302°	+0.98510193	-0.09937923
a : 3.5176969 ua	Ω : 195.3973848°	+0.11782717	+0.98449981
e : 0.7070563	i : 31.9108327°	+0.12526349	-0.14451257
P =6.60 years

Elements for the previous transit(s) through perihelion

Epoch :1998 November 21 at 0h TT, julian day 2451138.5 TT.

T =1998 November 21.31905 TT.
q :1.0337358 ua	(J2000)	P	Q
n : 0.14912554°/jour	ω : 172.5422104°	+0.98522179	-0.09847146
a : 3.5218271 ua	Ω : 195.3976327°	+0.11677936	+0.98473899
e : 0.7064774	i : 31.8590351°	+0.12530208	-0.14350088
P =6.61 years

Contact

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

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