(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 | 9.02 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.226596 ± 0.000000 au |
| Eccentricity | 0.046471858 ± 0.000000045 |
| Inclination | 2.669870101 ± 0.000001147 ° |
| Longitude of ascending node | 179.166078 ± 0.000113 ° |
| Argument of perihelia | 77.578167 ± 0.000126 ° |
| Mean anomaly | 115.336650 ± 0.000052 ° |
| Orbital period | 11.95 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv7 |
| Observation file |
omc_ast_NIMAv7.txt |
| bsp file | 2357_Phereclos_nima_v7.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2024-07-12 |
| Number of observations used in the fit | 4292 |
| Number of rejected observations | 21 |
| Number of DES observations | 0 |
| Number of MPC observations | 4297 |
| Number of unpublished observations | 16 |
| RMS of observations | 0.460 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.023 | 0.018 |
| 2024-07 | 0.030 | 0.020 |
| 2025-01 | 0.032 | 0.021 |
| 2025-07 | 0.032 | 0.016 |
| 2026-01 | 0.040 | 0.018 |
| 2026-07 | 0.034 | 0.009 |
| 2027-01 | 0.047 | 0.009 |
| 2027-07 | 0.034 | 0.003 |
| 2028-01 | 0.049 | 0.009 |
Ephemeris comparison
Difference between NIMAv7 and JPL76 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.