(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 ± 0.000000 au |
| Eccentricity | 0.041745069 ± 0.000000102 |
| Inclination | 9.375664311 ± 0.000006560 ° |
| Longitude of ascending node | 312.410140 ± 0.000030 ° |
| Argument of perihelia | 48.702191 ± 0.000114 ° |
| Mean anomaly | 305.976073 ± 0.000110 ° |
| Orbital period | 14.76 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv3 |
| Observation file |
omc_ast_NIMAv3.txt |
| bsp file | 29P_Schwassmann-Wachmann_nima_v3.bsp |
| Date of first observation | 2009-02-17 |
| Date of last observation | 2022-12-05 |
| Number of observations used in the fit | 1184 |
| Number of rejected observations | 0 |
| Number of DES observations | 0 |
| Number of MPC observations | 0 |
| Number of unpublished observations | 1184 |
| RMS of observations | 0.079 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.023 | 0.015 |
| 2022-07 | 0.009 | 0.007 |
| 2023-01 | 0.007 | 0.007 |
| 2023-07 | 0.010 | 0.008 |
| 2024-01 | 0.027 | 0.019 |
| 2024-07 | 0.026 | 0.019 |
| 2025-01 | 0.051 | 0.035 |
| 2025-07 | 0.044 | 0.032 |
| 2026-01 | 0.071 | 0.047 |
Ephemeris comparison
Difference between NIMAv3 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.