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Note number : 0011 P/Brooks 2 : 16P

• 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 549 observations 1987 April 11 to 2009 March 3, including full planetary and non-gravitational effect of type II, and relativity effect of the sun.

The mean residual is 0.66 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2008 April 12 at 0h TT, julian day 2454568.5.

Perihelion passage (T)	2008 April 12.59497 TT	±0.00000 TT
Argument of perihelion (ω)	219.4739841°	±0.0007022°
>Longitude of the node (Ω)	159.3713389°	۪.0006398°
Inclinaison (i)	4.2580202°	±0.0000445°
Perihelion distance (q)	1.4665947 ua	±0.0000018 ua
Eccentricity (e)	0.5626814	±0.0000038
Semimajor axis (a)	3.3536071 ua	±0.0000332 ua
Mean motion (n)	0.16048550°/jour	±0.00000239°/jour
Period (P)	6.142 years	±0.0000913 (0.0334 day)

Non-gravitational parameters :

A₁ = 0.36552 .10^-8 ±0.01949 .10^-8
A₂ = -0.13108 .10^-8 ±0.00013 .10^-8
A₃ = 0.01558 .10^-8 ±0.00791 .10^-8

Formulæ for magnitudes

Total magnitude :
m₁ = H₁ + 5log(Δ) + 10 log(r) avec H₁ = 12.71± 0.03 calculé à l'aide de 184 observation(s).
Nuclear magnitude :
m₂ = H₂ + 5log(Δ) + 5 log(r) avec H₂ = 14.71±0.06 calculé à l'aide de 37 observation(s).

Elements for the next transit through perihelion

Epoch :2014 June 7 at 0h TT, julian day 2456815.5 TT.

T =2014 June 7.69090 TT.
q :1.4663449 ua	(J2000)	P	Q
n : 0.16048569°/jour	ω : 219.6554421°	+0.94510951	-0.32569864
a : 3.3536045 ua	Ω : 159.3069610°	+0.31547041	+0.88860747
e : 0.5627556	i : 4.2582415°	+0.08512604	+0.32295071
P =6.14 years

Elements for the previous transit(s) through perihelion

Epoch :2001 July 19 at 0h TT, julian day 2452109.5 TT.

T =2001 July 19.83328 TT.
q :1.8349014 ua	(J2000)	P	Q
n : 0.14360804°/jour	ω : 198.1067827°	+0.96575474	-0.25940450
a : 3.6114661 ua	Ω : 176.9137258°	+0.24839742	+0.91860855
e : 0.4919234	i : 5.5481189°	+0.07494339	+0.29810674
P =6.86 years

Epoch :1994 September 1 at 0h TT, julian day 2449596.5 TT.

T =1994 September 1.07951 TT.
q :1.8433434 ua	(J2000)	P	Q
n : 0.14312659°/jour	ω : 197.9891455°	+0.96614085	-0.25796392
a : 3.6195604 ua	Ω : 176.9460952°	+0.24700035	+0.91894819
e : 0.4907273	i : 5.5412875°	+0.07458335	+0.29830999
P =6.89 years

Epoch :1987 October 16 at 0h TT, julian day 2447084.5 TT.

T =1987 October 16.55203 TT.
q :1.8447990 ua	(J2000)	P	Q
n : 0.14298940°/jour	ω : 198.1372675°	+0.96545446	-0.26052117
a : 3.6218753 ua	Ω : 176.9496912°	+0.24943286	+0.91829785
e : 0.4906509	i : 5.5425195°	+0.07537203	+0.29809023
P =6.89 years

Contact

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

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