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Note number : 0081 P/Howell : 88P

Introduction

The following improved orbital elements, are from 1492 observations 2003 January 31 to 2015 April 1, including full planetary and non-gravitational effect of type II, and relativity effect of the sun.

The mean residual is 0.51 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2015 April 6 at 0h TT, julian day 2457118.5.

Perihelion passage (T) 2015 April 6.23408 TT ±0.00000 TT
Argument of perihelion (ω) 235.9180942° ±0.0002687°
>Longitude of the node (Ω) 56.6974669° ۪.0002663°
Inclinaison (i) 4.3825131° ±0.0000191°
Perihelion distance (q) 1.3585936 ua ±0.0000005 ua
Eccentricity (e) 0.5630159 ±0.0000013
Semimajor axis (a) 3.1090232 ua ±0.0000106 ua
Mean motion (n) 0.17979108°/jour ±0.00000092°/jour
Period (P) 5.482 years ±0.0000279 (0.0102 day)

Non-gravitational parameters :

A1 = 0.89664 .10-8 ±0.00310 .10-8
A2 = -0.02272 .10-8 ±0.00007 .10-8
A3 = -0.00145 .10-8 ±0.00421 .10-8

Formulæ for magnitudes

Total magnitude :
m1 = H1 + 5log(Δ) + 10 log(r) with H1 = 12.16± 0.04 calculated using 311 observation(s).
Nuclear magnitude :
m2 = H2 + 5log(Δ) + 5 log(r) with H2 = 13.84±0.03 calculated using 609 observation(s).

Elements for the next transit through perihelion

Epoch :2020 September 26 at 0h TT, julian day 2459118.5 TT.

T =2020 September 26.56287 TT.
q :1.3531120 ua (J2000) P Q
n : 0.18006462°/jour ω : 235.9115510° +0.38217169 +0.92188157
a : 3.1058736 ua Ω : 56.6822864° -0.82066742 +0.37035888
e : 0.5643377 i : 4.3834372° -0.42479381 +0.11388013
P =5.47 years

Elements for the previous transit(s) through perihelion

Epoch :2009 October 12 at 0h TT, julian day 2455116.5 TT.

T =2009 October 12.46450 TT.
q :1.3634868 ua (J2000) P Q
n : 0.17945567°/jour ω : 235.9600667° +0.38415641 +0.92105405
a : 3.1128958 ua Ω : 56.7570859° -0.81990387 +0.37215057
e : 0.5619877 i : 4.3818862° -0.42447791 +0.11473182
P =5.49 years

Epoch :2004 April 12 at 0h TT, julian day 2453107.5 TT.

T =2004 April 12.56255 TT.
q :1.3675158 ua (J2000) P Q
n : 0.17918799°/jour ω : 235.8471638° +0.38334823 +0.92138684
a : 3.1159952 ua Ω : 56.8197597° -0.82024708 +0.37146205
e : 0.5611303 i : 4.3825722° -0.42454548 +0.11429012
P =5.50 years

Contact

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

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