(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) | 2460600.5 |
| Semi major axis | 10.623740 ± 0.000002 au |
| Eccentricity | 0.197946289 ± 0.000000146 |
| Inclination | 20.379455500 ± 0.000001264 ° |
| Longitude of ascending node | 205.161551 ± 0.000015 ° |
| Argument of perihelia | 86.905370 ± 0.000035 ° |
| Mean anomaly | 266.178611 ± 0.000067 ° |
| Orbital period | 34.63 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 32532_Thereus_nima_v2.bsp |
| Date of first observation | 1983-01-13 |
| Date of last observation | 2024-05-12 |
| Number of observations used in the fit | 994 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 697 |
| Number of unpublished observations | 9 |
| RMS of observations | 0.115 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) |
| 2024-01 | 0.044 | 0.015 |
| 2024-07 | 0.040 | 0.015 |
| 2025-01 | 0.059 | 0.017 |
| 2025-07 | 0.056 | 0.016 |
| 2026-01 | 0.078 | 0.018 |
| 2026-07 | 0.076 | 0.018 |
| 2027-01 | 0.101 | 0.018 |
| 2027-07 | 0.103 | 0.019 |
| 2028-01 | 0.128 | 0.018 |
Ephemeris comparison
Difference between NIMAv2 and JPL61 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.