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

Introduction

The following improved orbital elements, are from 501 observations 1961 November 9 to 2011 November 25, 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 : 2013 July 8 at 0h TT, julian day 2456481.5.

Perihelion passage (T) 2013 July 6.01624 TT ±0.00000 TT
Argument of perihelion (ω) 2.1539981° ±0.0000256°
>Longitude of the node (Ω) 211.5525293° ۪.0000188°
Inclinaison (i) 22.4237773° ±0.0000062°
Perihelion distance (q) 1.0858613 ua ±0.0000003 ua
Eccentricity (e) 0.6401350 ±0.0000010
Semimajor axis (a) 3.0174126 ua ±0.0000096 ua
Mean motion (n) 0.18804077°/jour ±0.00000089°/jour
Period (P) 5.242 years ±0.0000249 (0.0091 day)

Non-gravitational parameters :

A1 = 0.00705 .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 :2018 October 2 at 0h TT, julian day 2458393.5 TT.

T =2018 October 1.81960 TT.
q :1.0822965 ua (J2000) P Q
n : 0.18832466°/jour ω : 2.2007424° -0.83314013 +0.51574135
a : 3.0143795 ua Ω : 211.5339430° -0.51307911 -0.85556281
e : 0.6409554 i : 22.4497281° -0.20646393 +0.04497925
P =5.23 years

Elements for the previous transit(s) through perihelion

Epoch :2008 March 23 at 0h TT, julian day 2454548.5 TT.

T =2008 March 23.68864 TT.
q :1.1167125 ua (J2000) P Q
n : 0.18568879°/jour ω : 1.7146420° -0.83582961 +0.51129822
a : 3.0428387 ua Ω : 211.7061972° -0.50810646 -0.85836439
e : 0.6330030 i : 22.3564630° -0.20788624 +0.04224571
P =5.31 years

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 : 0.18562101°/jour ω : 1.6239201° -0.83631658 +0.51045789
a : 3.0435794 ua Ω : 211.7397292° -0.50719551 -0.85888242
e : 0.6327108 i : 22.3472156° -0.20815207 +0.04187761
P =5.31 years

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

T =1997 August 30.30399 TT.
q :0.9968110 ua (J2000) P Q
n : 0.19305363°/jour ω : 359.3319154° -0.84163807 +0.50260238
a : 2.9649502 ua Ω : 213.3090633° -0.49379520 -0.86434308
e : 0.6638018 i : 21.0867806° -0.21865878 +0.01737489
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 : 0.19321370°/jour ω : 359.2650419° -0.84193052 +0.50200523
a : 2.9633124 ua Ω : 213.3401956° -0.49320557 -0.86468884
e : 0.6643317 i : 21.0989154° -0.21886356 +0.01743475
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 : 0.19328955°/jour ω : 359.3056711° -0.84161939 +0.50253096
a : 2.9625372 ua Ω : 213.3354084° -0.49375406 -0.86438005
e : 0.6647118 i : 21.1005064° -0.21882350 +0.01760033
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 : 0.19364755°/jour ω : 359.3170143° -0.84146370 +0.50267068
a : 2.9588847 ua Ω : 213.3412318° -0.49400304 -0.86428659
e : 0.6656686 i : 21.1314023° -0.21886031 +0.01819001
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 : 0.19328197°/jour ω : 359.3111641° -0.84140005 +0.50286757
a : 2.9626146 ua Ω : 213.3535684° -0.49408167 -0.86418323
e : 0.6646927 i : 21.0985301° -0.21892750 +0.01765104
P =5.10 years

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

T =1972 March 2.65305 TT.
q :1.0013083 ua (J2000) P Q
n : 0.19257381°/jour ω : 359.2710247° -0.84168806 +0.50249993
a : 2.9698732 ua Ω : 213.3605391° -0.49357087 -0.86441208
e : 0.6628448 i : 21.0619408° -0.21897262 +0.01689901
P =5.12 years

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

T =1967 January 16.47560 TT.
q :1.0029542 ua (J2000) P Q
n : 0.19245132°/jour ω : 359.1595570° -0.84234848 +0.50138582
a : 2.9711332 ua Ω : 213.3942040° -0.49234286 -0.86507054
e : 0.6624338 i : 21.0440428° -0.21919752 +0.01628539
P =5.12 years

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

T =1961 December 31.35836 TT.
q :0.8577594 ua (J2000) P Q
n : 0.20083453°/jour ω : 356.3691510° -0.84217149 +0.50891482
a : 2.8878666 ua Ω : 216.0744467° -0.48677963 -0.85971421
e : 0.7029782 i : 17.6150176° -0.23193268 -0.04355658
P =4.91 years

Contact

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

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