(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 |
0.041745067 ± 0.000000102 |
| Inclination |
9.375664105 ± 0.000006545 ° |
| Longitude of ascending node |
312.410135 ± 0.000028 ° |
| Argument of perihelia |
48.702193 ± 0.000113 ° |
| Mean anomaly |
305.976075 ± 0.000110 ° |
| Orbital period |
14.76 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv4 |
| Observation file (documentation) |
omc_ast_NIMAv4.txt |
| bsp file |
29P_Schwassmann-Wachmann_nima_v4.bsp |
| Date of first observation |
2009-02-17 |
| Date of last observation |
2022-12-19 |
| Number of observations used in the fit |
1185 |
| Number of rejected observations |
0 |
| Number of DES observations |
0 |
| Number of MPC observations |
0 |
| Number of unpublished observations |
1185 |
| RMS of observations |
0.079 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2022-01 |
0.022 |
0.014 |
| 2022-07 |
0.008 |
0.005 |
| 2023-01 |
0.001 |
0.001 |
| 2023-07 |
0.008 |
0.006 |
| 2024-01 |
0.026 |
0.017 |
| 2024-07 |
0.025 |
0.018 |
| 2025-01 |
0.050 |
0.035 |
| 2025-07 |
0.044 |
0.031 |
| 2026-01 |
0.070 |
0.047 |
Ephemeris comparison
Difference between NIMAv4 and JPLK192-43 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