(29P) Schwassmann-Wachmann
Object
| Object |
(29P) Schwassmann-Wachmann |
| Diameter(1) |
60 km |
| Dynamic class(1) |
comet |
| Absolute magnitude |
5.85 |
| G slop |
0.20 |
Orbital elements
| Epoch (Julian date) |
2457754.5 |
| Semi major axis |
6.016546 ± 0.000000 au |
| Eccentricity |
0.041745075 ± 0.000000086 |
| Inclination |
9.375663820 ± 0.000006232 ° |
| Longitude of ascending node |
312.410137 ± 0.000027 ° |
| Argument of perihelia |
48.702185 ± 0.000100 ° |
| Mean anomaly |
305.976082 ± 0.000096 ° |
| Orbital period |
14.76 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv5 |
| Observation file (documentation) |
omc_ast_NIMAv5.txt |
| bsp file |
29P_Schwassmann-Wachmann_nima_v5.bsp |
| Date of first observation |
2009-02-17 |
| Date of last observation |
2025-01-15 |
| Number of observations used in the fit |
1293 |
| Number of rejected observations |
0 |
| Number of DES observations |
0 |
| Number of MPC observations |
0 |
| Number of unpublished observations |
1293 |
| RMS of observations |
0.081 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.022 |
0.015 |
| 2024-07 |
0.021 |
0.016 |
| 2025-01 |
0.041 |
0.030 |
| 2025-07 |
0.036 |
0.027 |
| 2026-01 |
0.058 |
0.040 |
| 2026-07 |
0.053 |
0.038 |
| 2027-01 |
0.073 |
0.043 |
| 2027-07 |
0.073 |
0.046 |
| 2028-01 |
0.087 |
0.038 |
Ephemeris comparison
Difference between NIMAv5 and JPLK192-80 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.
Previous NIMA versions