(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 | 8.94 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.211718 ± 0.000000 au |
| Eccentricity | 0.045653124 ± 0.000000071 |
| Inclination | 2.668647110 ± 0.000005693 ° |
| Longitude of ascending node | 179.248077 ± 0.000128 ° |
| Argument of perihelia | 74.133264 ± 0.000176 ° |
| Mean anomaly | 313.068086 ± 0.000115 ° |
| Orbital period | 11.90 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv3 |
| Observation file |
omc_ast_NIMAv3.txt |
| bsp file | 2357_Phereclos_nima_v3.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2020-08-27 |
| Number of observations used in the fit | 3094 |
| Number of rejected observations | 16 |
| Number of DES observations | 0 |
| Number of MPC observations | 3095 |
| Number of unpublished observations | 15 |
| RMS of observations | 0.532 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) |
| 2020-01 | 0.024 | 0.019 |
| 2020-07 | 0.033 | 0.025 |
| 2021-01 | 0.028 | 0.018 |
| 2021-07 | 0.046 | 0.028 |
| 2022-01 | 0.033 | 0.019 |
| 2022-07 | 0.052 | 0.029 |
| 2023-01 | 0.038 | 0.021 |
| 2023-07 | 0.050 | 0.029 |
| 2024-01 | 0.042 | 0.024 |
Ephemeris comparison
Difference between NIMAv3 and JPL47 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.