(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 (documentation) 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Number of unpublished observations 1184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

residual plot

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

residual plot

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.