(32532) Thereus
This object has a more recent orbit available here
Object
| Object | (32532) Thereus |
| Diameter(1) | 86 km |
| Dynamic class(1) | Centaur |
| Absolute magnitude | 9.04 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460400.5 |
| Semi major axis | 10.617454 ± 0.000002 au |
| Eccentricity | 0.198328423 ± 0.000000155 |
| Inclination | 20.383018319 ± 0.000001269 ° |
| Longitude of ascending node | 205.155407 ± 0.000015 ° |
| Argument of perihelia | 87.074513 ± 0.000040 ° |
| Mean anomaly | 260.340068 ± 0.000076 ° |
| Orbital period | 34.60 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 32532_Thereus_nima_v1.bsp |
| Date of first observation | 1983-01-13 |
| Date of last observation | 2024-01-08 |
| Number of observations used in the fit | 954 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 666 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.115 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) |
| 2023-01 | 0.038 | 0.013 |
| 2023-07 | 0.034 | 0.013 |
| 2024-01 | 0.052 | 0.015 |
| 2024-07 | 0.048 | 0.015 |
| 2025-01 | 0.070 | 0.017 |
| 2025-07 | 0.067 | 0.017 |
| 2026-01 | 0.093 | 0.018 |
| 2026-07 | 0.091 | 0.018 |
| 2027-01 | 0.119 | 0.019 |
Ephemeris comparison
Difference between NIMAv1 and JPL59 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.