(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 | 6.45 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 99.169255 ± 0.008498 au |
| Eccentricity | 0.820688281 ± 0.000014219 |
| Inclination | 22.329491896 ± 0.000036180 ° |
| Longitude of ascending node | 172.177976 ± 0.000115 ° |
| Argument of perihelia | 319.319714 ± 0.000759 ° |
| Mean anomaly | 12.069407 ± 0.001591 ° |
| Orbital period | 987.58 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv3 |
| Observation file |
omc_ast_NIMAv3.txt |
| bsp file | 65489_Ceto_nima_v3.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| Number of unpublished observations | 0 |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 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 | 0.131 | 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 | 0.153 | 0.073 |
| 2025-01 | 0.189 | 0.077 |
| 2025-07 | 0.172 | 0.076 |
| 2026-01 | 0.209 | 0.080 |
Ephemeris comparison
Difference between NIMAv3 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.