(307261) 2002MS4
This object has a more recent orbit available here
Object
Object | (307261) 2002MS4 |
Diameter(1) | 934 km |
Dynamic class(1) | cubewano |
Absolute magnitude | 3.68 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2459800.5 |
Semi major axis | 41.907410 ± 0.000279 au |
Eccentricity | 0.144061144 ± 0.000005583 |
Inclination | 17.706927419 ± 0.000014750 ° |
Longitude of ascending node | 216.224998 ± 0.000114 ° |
Argument of perihelia | 212.535740 ± 0.001228 ° |
Mean anomaly | 228.381654 ± 0.001490 ° |
Orbital period | 271.30 yr |
Ephemeris & Observations
Ephemeris version | NIMAv10 |
Observation file |
omc_ast_NIMAv10.txt |
bsp file | 307261_2002MS4_nima_v10.bsp |
Date of first observation | 1954-04-08 |
Date of last observation | 2022-07-04 |
Number of observations used in the fit | 233 |
Number of rejected observations | 6 |
Number of DES observations | 0 |
Number of MPC observations | 128 |
Number of unpublished observations | 111 |
RMS of observations | 0.140 arcsec |
Residuals

Residuals in right ascension and declination compared to NIMAv10 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2022-01 | 0.010 | 0.007 |
2022-07 | 0.014 | 0.008 |
2023-01 | 0.015 | 0.009 |
2023-07 | 0.019 | 0.010 |
2024-01 | 0.020 | 0.011 |
2024-07 | 0.025 | 0.013 |
2025-01 | 0.026 | 0.013 |
2025-07 | 0.032 | 0.016 |
2026-01 | 0.033 | 0.016 |
Ephemeris comparison

Difference between NIMAv10 and JPL18 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.