(65489) Ceto
Object
| Object |
(65489) Ceto |
| Diameter(1) |
223 km |
| Dynamic class(1) |
Centaur |
| Absolute magnitude |
6.45 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
100.082937 ± 0.008578 au |
| Eccentricity |
0.823143732 ± 0.000014031 |
| Inclination |
22.302656395 ± 0.000035983 ° |
| Longitude of ascending node |
172.003141 ± 0.000116 ° |
| Argument of perihelia |
319.358537 ± 0.000751 ° |
| Mean anomaly |
12.860521 ± 0.001692 ° |
| Orbital period |
1001.26 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv4 |
| Observation file (documentation) |
omc_ast_NIMAv4.txt |
| bsp file |
65489_Ceto_nima_v4.bsp |
| Date of first observation |
1987-01-31 |
| Date of last observation |
2025-05-27 |
| Number of observations used in the fit |
227 |
| Number of rejected observations |
6 |
| Number of DES observations |
0 |
| Number of MPC observations |
233 |
| Number of unpublished observations |
0 |
| RMS of observations |
0.269 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) |
| 2024-01 |
0.165 |
0.074 |
| 2024-07 |
0.151 |
0.073 |
| 2025-01 |
0.185 |
0.077 |
| 2025-07 |
0.170 |
0.076 |
| 2026-01 |
0.205 |
0.080 |
| 2026-07 |
0.190 |
0.079 |
| 2027-01 |
0.225 |
0.082 |
| 2027-07 |
0.211 |
0.081 |
| 2028-01 |
0.246 |
0.085 |
Ephemeris comparison
Difference between NIMAv4 and JPL12 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