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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 709 observations 2004 June 21 to 2012 February 1, including full planetary and non-gravitational effect of type II, and relativity effect of the sun.

The mean residual is 0.44 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2012 February 11 at 0h TT, julian day 2455968.5.

Perihelion passage (T)	2012 February 11.73325 TT	±0.00000 TT
Argument of perihelion (ω)	172.6017114°	±0.0000449°
>Longitude of the node (Ω)	195.3966798°	۪.0000363°
Inclinaison (i)	31.9107682°	±0.0000215°
Perihelion distance (q)	1.0305054 ua	±0.0000008 ua
Eccentricity (e)	0.7070620	±0.0000020
Semimajor axis (a)	3.5178272 ua	±0.0000270 ua
Mean motion (n)	0.14937996°/jour	±0.00000172°/jour
Period (P)	6.598 years	±0.0000760 (0.0278 day)

Non-gravitational parameters :

A₁ = 0.35827 .10^-8 ±0.02321 .10^-8
A₂ = 0.18945 .10^-8 ±0.02043 .10^-8
A₃ = -0.06096 .10^-8 ±0.00550 .10^-8

Formulæ for magnitudes

Total magnitude :
m₁ = H₁ + 5log(Δ) + 10 log(r) avec H₁ = 11.27± 0.10 calculé à l'aide de 116 observation(s).
Nuclear magnitude :
m₂ = H₂ + 5log(Δ) + 5 log(r) avec H₂ = 13.20±0.06 calculé à l'aide de 442 observation(s).

Elements for the next transit through perihelion

Epoch :2018 September 10 at 0h TT, julian day 2458371.5 TT.

T =2018 September 10.95559 TT.
q :1.0127516 ua	(J2000)	P	Q
n : 0.15059157°/jour	ω : 172.8620232°	+0.98462867	-0.10355714
a : 3.4989329 ua	Ω : 195.3926044°	+0.12223408	+0.98376678
e : 0.7105542	i : 31.9980091°	+0.12476059	-0.14655664
P =6.55 years

Elements for the previous transit(s) through perihelion

Epoch :2005 July 2 at 0h TT, julian day 2453553.5 TT.

T =2005 July 2.75989 TT.
q :1.0379167 ua	(J2000)	P	Q
n : 0.14884825°/jour	ω : 172.5422904°	+0.98515036	-0.09905458
a : 3.5261996 ua	Ω : 195.4291481°	+0.11726398	+0.98479547
e : 0.7056557	i : 31.8111886°	+0.12541102	-0.14270977
P =6.62 years

Contact

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

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