(29P) Schwassmann-Wachmann
This object has a more recent orbit available here
Object
| Object | (29P) Schwassmann-Wachmann |
| Diameter(1) | 60 km |
| Dynamic class(1) | comet |
| Absolute magnitude | 5.85 |
| G slop | 0.20 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2457754.5 |
| Semi major axis | 6.016546 ± 0.000002 au |
| Eccentricity | 0.041745068 ± 0.000000200 |
| Inclination | 9.375666799 ± 0.000011667 ° |
| Longitude of ascending node | 312.410154 ± 0.000070 ° |
| Argument of perihelia | 48.702171 ± 0.000397 ° |
| Mean anomaly | 305.976079 ± 0.000404 ° |
| Orbital period | 14.76 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 29P_Schwassmann-Wachmann_nima_v1.bsp |
| Date of first observation | 2009-02-17 |
| Date of last observation | 2020-11-19 |
| Number of observations used in the fit | 559 |
| Number of rejected observations | 0 |
| Number of DES observations | 0 |
| Number of MPC observations | 0 |
| Number of unpublished observations | 559 |
| RMS of observations | 0.079 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.078 | 0.054 |
| 2021-07 | 0.099 | 0.040 |
| 2022-01 | 0.148 | 0.053 |
| 2022-07 | 0.145 | 0.041 |
| 2023-01 | 0.232 | 0.068 |
| 2023-07 | 0.189 | 0.068 |
| 2024-01 | 0.291 | 0.133 |
| 2024-07 | 0.229 | 0.111 |
| 2025-01 | 0.325 | 0.187 |
Ephemeris comparison
Difference between NIMAv1 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.