(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 | 101.643722 ± 0.012643 au |
| Eccentricity | 0.823649856 ± 0.000020662 |
| Inclination | 22.293604386 ± 0.000250606 ° |
| Longitude of ascending node | 171.986771 ± 0.000434 ° |
| Argument of perihelia | 320.096057 ± 0.001275 ° |
| Mean anomaly | 10.452027 ± 0.001999 ° |
| Orbital period | 1024.78 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 65489_Ceto_nima_v1.bsp |
| Date of first observation | 1987-01-31 |
| Date of last observation | 2015-07-12 |
| Number of observations used in the fit | 139 |
| Number of rejected observations | 1 |
| Number of DES observations | 0 |
| Number of MPC observations | 140 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.336 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.180 | 0.099 |
| 2018-07 | 0.152 | 0.097 |
| 2019-01 | 0.210 | 0.103 |
| 2019-07 | 0.181 | 0.101 |
| 2020-01 | 0.240 | 0.107 |
| 2020-07 | 0.211 | 0.105 |
| 2021-01 | 0.273 | 0.111 |
| 2021-07 | 0.244 | 0.108 |
| 2022-01 | 0.306 | 0.115 |
Ephemeris comparison
Difference between NIMAv1 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.