(65489) Ceto
This object has a more recent orbit available here
Object
| Object | (65489) Ceto |
| Diameter(1) | 223 km |
| Dynamic class(1) | Centaur? |
| Absolute magnitude | 6.40 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 101.650555 ± 0.008350 au |
| Eccentricity | 0.823660987 ± 0.000013444 |
| Inclination | 22.293618513 ± 0.000166491 ° |
| Longitude of ascending node | 171.986772 ± 0.000301 ° |
| Argument of perihelia | 320.096555 ± 0.000941 ° |
| Mean anomaly | 10.450945 ± 0.001323 ° |
| Orbital period | 1024.88 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 65489_Ceto_nima_v2.bsp |
| Date of first observation | 1987-01-31 |
| Date of last observation | 2020-05-12 |
| Number of observations used in the fit | 225 |
| Number of rejected observations | 6 |
| Number of DES observations | 0 |
| Number of MPC observations | 231 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.268 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.114 | 0.065 |
| 2021-07 | 0.098 | 0.065 |
| 2022-01 | 0.132 | 0.068 |
| 2022-07 | 0.115 | 0.068 |
| 2023-01 | 0.150 | 0.071 |
| 2023-07 | 0.133 | 0.071 |
| 2024-01 | 0.169 | 0.074 |
| 2024-07 | 0.152 | 0.073 |
| 2025-01 | 0.189 | 0.077 |
Ephemeris comparison
Difference between NIMAv2 and JPL9 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.