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Note number : 0035 P/Grigg-Skjellerup : 26P

• 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 498 observations 1961 November 9 to 2008 August 9, 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 : 2008 March 23 at 0h TT, julian day 2454548.5.

Perihelion passage (T)	2008 March 23.68865 TT	±0.00000 TT
Argument of perihelion (ω)	1.7146448°	±0.0000154°
>Longitude of the node (Ω)	211.7062004°	۪.0000117°
Inclinaison (i)	22.3564658°	±0.0000046°
Perihelion distance (q)	1.1167126 ua	±0.0000001 ua
Eccentricity (e)	0.6330030	±0.0000005
Semimajor axis (a)	3.0428387 ua	±0.0000045 ua
Mean motion (n)	0.18568878°/jour	±0.00000041°/jour
Period (P)	5.308 years	±0.0000118 (0.0043 day)

Non-gravitational parameters :

A₁ = 0.00683 .10^-8 ±0.00047 .10^-8
A₂ = -0.00104 .10^-8 ±0.00001 .10^-8

Formulæ for magnitudes

Total magnitude :
m₁ = H₁ + 5log(Δ) + 10 log(r) avec H₁ = 16.38± 0.07 calculé à l'aide de 76 observation(s).
Nuclear magnitude :
m₂ = H₂ + 5log(Δ) + 5 log(r) avec H₂ = 17.20±0.03 calculé à l'aide de 173 observation(s).

Elements for the next transit through perihelion

Epoch :2013 July 6 at 0h TT, julian day 2456479.5 TT.

T =2013 July 6.01623 TT.
q :1.0858613 ua	(J2000)	P	Q
n : 0.18804131°/jour	ω : 2.1539714°	-0.83337823	+0.51540045
a : 3.0174068 ua	Ω : 211.5525334°	-0.51262747	-0.85579665
e : 0.6401343	i : 22.4237852°	-0.20662478	+0.04443495
P =5.24 years

Elements for the previous transit(s) through perihelion

Epoch :2002 November 29 at 0h TT, julian day 2452607.5 TT.

T =2002 November 29.71915 TT.
q :1.1178738 ua	(J2000)	P	Q
n : 0.18562100°/jour	ω : 1.6239217°	-0.83631654	+0.51045794
a : 3.0435794 ua	Ω : 211.7397324°	-0.50719558	-0.85888238
e : 0.6327108	i : 22.3472184°	-0.20815209	+0.04187767
P =5.31 years

Epoch :1997 August 30 at 0h TT, julian day 2450690.5 TT.

T =1997 August 30.30398 TT.
q :0.9968110 ua	(J2000)	P	Q
n : 0.19305362°/jour	ω : 359.3319155°	-0.84163803	+0.50260242
a : 2.9649503 ua	Ω : 213.3090669°	-0.49379525	-0.86434306
e : 0.6638018	i : 21.0867823°	-0.21865880	+0.01737494
P =5.11 years

Epoch :1992 July 22 at 0h TT, julian day 2448825.5 TT.

T =1992 July 22.13789 TT.
q :0.9946901 ua	(J2000)	P	Q
n : 0.19321369°/jour	ω : 359.2650408°	-0.84193050	+0.50200525
a : 2.9633125 ua	Ω : 213.3401993°	-0.49320561	-0.86468882
e : 0.6643317	i : 21.0989172°	-0.21886359	+0.01743478
P =5.10 years

Epoch :1987 June 18 at 0h TT, julian day 2446964.5 TT.

T =1987 June 18.04596 TT.
q :0.9933037 ua	(J2000)	P	Q
n : 0.19328954°/jour	ω : 359.3056689°	-0.84161938	+0.50253097
a : 2.9625372 ua	Ω : 213.3354121°	-0.49375408	-0.86438004
e : 0.6647118	i : 21.1005082°	-0.21882353	+0.01760036
P =5.10 years

Epoch :1982 May 14 at 0h TT, julian day 2445103.5 TT.

T =1982 May 14.99665 TT.
q :0.9892482 ua	(J2000)	P	Q
n : 0.19364754°/jour	ω : 359.3170109°	-0.84146370	+0.50267068
a : 2.9588848 ua	Ω : 213.3412355°	-0.49400304	-0.86428659
e : 0.6656686	i : 21.1314041°	-0.21886033	+0.01819004
P =5.09 years

Epoch :1977 April 11 at 0h TT, julian day 2443244.5 TT.

T =1977 April 11.00086 TT.
q :0.9933863 ua	(J2000)	P	Q
n : 0.19328196°/jour	ω : 359.3111596°	-0.84140006	+0.50286754
a : 2.9626147 ua	Ω : 213.3535721°	-0.49408165	-0.86418324
e : 0.6646927	i : 21.0985319°	-0.21892753	+0.01765107
P =5.10 years

Epoch :1972 March 2 at 0h TT, julian day 2441378.5 TT.

T =1972 March 2.65304 TT.
q :1.0013083 ua	(J2000)	P	Q
n : 0.19257380°/jour	ω : 359.2710191°	-0.84168808	+0.50249990
a : 2.9698733 ua	Ω : 213.3605428°	-0.49357083	-0.86441210
e : 0.6628448	i : 21.0619426°	-0.21897265	+0.01689904
P =5.12 years

Epoch :1967 January 16 at 0h TT, julian day 2439506.5 TT.

T =1967 January 16.47558 TT.
q :1.0029542 ua	(J2000)	P	Q
n : 0.19245131°/jour	ω : 359.1595503°	-0.84234850	+0.50138577
a : 2.9711332 ua	Ω : 213.3942077°	-0.49234280	-0.86507057
e : 0.6624338	i : 21.0440446°	-0.21919755	+0.01628540
P =5.12 years

Epoch :1961 December 31 at 0h TT, julian day 2437664.5 TT.

T =1961 December 31.35833 TT.
q :0.8577595 ua	(J2000)	P	Q
n : 0.20083451°/jour	ω : 356.3691447°	-0.84217152	+0.50891476
a : 2.8878667 ua	Ω : 216.0744498°	-0.48677957	-0.85971425
e : 0.7029782	i : 17.6150221°	-0.23193270	-0.04355652
P =4.91 years

Contact

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

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