(2357) Phereclos
This object has a more recent orbit available here
Object
| Object | (2357) Phereclos |
| Diameter(1) | 95 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 9.07 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 5.223614 ± 0.000000 au |
| Eccentricity | 0.047466875 ± 0.000000048 |
| Inclination | 2.668335423 ± 0.000001153 ° |
| Longitude of ascending node | 179.180422 ± 0.000123 ° |
| Argument of perihelia | 76.749719 ± 0.000137 ° |
| Mean anomaly | 50.003938 ± 0.000056 ° |
| Orbital period | 11.94 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 2357_Phereclos_nima_v5.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2022-07-11 |
| Number of observations used in the fit | 3393 |
| Number of rejected observations | 19 |
| Number of DES observations | 0 |
| Number of MPC observations | 3396 |
| Number of unpublished observations | 16 |
| RMS of observations | 0.510 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.007 | 0.006 |
| 2022-07 | 0.019 | 0.015 |
| 2023-01 | 0.017 | 0.014 |
| 2023-07 | 0.030 | 0.022 |
| 2024-01 | 0.027 | 0.020 |
| 2024-07 | 0.035 | 0.023 |
| 2025-01 | 0.036 | 0.023 |
| 2025-07 | 0.037 | 0.018 |
| 2026-01 | 0.044 | 0.019 |
Ephemeris comparison
Difference between NIMAv5 and JPL65 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.