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Note number : 0016 P/Schwassmann-Wachmann 2 : 31P

Introduction

The following improved orbital elements, are from 714 observations 2000 November 24 to 2012 May 21. Perturbations by all nine planets were taken into account, and relativity effect of the sun.

The mean residual is 0.50 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2010 September 29 at 0h TT, julian day 2455468.5.

Perihelion passage (T) 2010 September 29.48947 TT ±0.00000 TT
Argument of perihelion (ω) 17.9350813° ±0.0000669°
>Longitude of the node (Ω) 114.1886324° ۪.0000686°
Inclinaison (i) 4.5467579° ±0.0000065°
Perihelion distance (q) 3.4243208 ua ±0.0000003 ua
Eccentricity (e) 0.1927801 ±0.0000004
Semimajor axis (a) 4.2421167 ua ±0.0000023 ua
Mean motion (n) 0.11280547°/jour ±0.00000009°/jour
Period (P) 8.737 years ±0.0000070 (0.0026 day)

Formulæ for magnitudes

Total magnitude :
m1 = H1 + 5log(Δ) + 10 log(r) avec H1 = 11.17± 0.03 calculé à l'aide de 380 observation(s).
Nuclear magnitude :
m2 = H2 + 5log(Δ) + 5 log(r) avec H2 = 13.56±0.02 calculé à l'aide de 180 observation(s).

Elements for the next transit through perihelion

Epoch :2019 July 6 at 0h TT, julian day 2458670.5 TT.

T =2019 July 6.14985 TT.
q :3.4253854 ua (J2000) P Q
n : 0.11272437°/jour ω : 18.3553386° -0.67426058 -0.73493977
a : 4.2441510 ua Ω : 114.1116480° +0.66723653 -0.64826311
e : 0.1929162 i : 4.5471003° +0.31649340 -0.19904391
P =8.74 years

Elements for the previous transit(s) through perihelion

Epoch :2002 January 18 at 0h TT, julian day 2452292.5 TT.

T =2002 January 18.49899 TT.
q :3.4085519 ua (J2000) P Q
n : 0.11307653°/jour ω : 18.4023267° -0.67590820 -0.73342517
a : 4.2353348 ua Ω : 114.1929757° +0.66581977 -0.64978193
e : 0.1952107 i : 4.5497451° +0.31596224 -0.19967716
P =8.72 years

Epoch :1994 January 23 at 0h TT, julian day 2449375.5 TT.

T =1994 January 23.92474 TT.
q :2.0703691 ua (J2000) P Q
n : 0.15425757°/jour ω : 358.2235793° -0.56595978 -0.82273991
a : 3.4432751 ua Ω : 126.2416588° +0.75720742 -0.54407704
e : 0.3987210 i : 3.7540805° +0.32607738 -0.16455765
P =6.39 years

Contact

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

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