(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 | 0.045653147 ± 0.000000033 |
| Inclination | 2.668644415 ± 0.000000648 ° |
| Longitude of ascending node | 179.248162 ± 0.000067 ° |
| Argument of perihelia | 74.133281 ± 0.000072 ° |
| Mean anomaly | 313.067993 ± 0.000027 ° |
| Orbital period | 11.90 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 2357_Phereclos_nima_v4.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2021-06-18 |
| Number of observations used in the fit | 3240 |
| Number of rejected observations | 16 |
| Number of DES observations | 0 |
| Number of MPC observations | 3143 |
| Number of unpublished observations | 16 |
| RMS of observations | 0.128 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.004 | 0.003 |
| 2021-07 | 0.005 | 0.003 |
| 2022-01 | 0.005 | 0.004 |
| 2022-07 | 0.012 | 0.009 |
| 2023-01 | 0.010 | 0.008 |
| 2023-07 | 0.017 | 0.014 |
| 2024-01 | 0.015 | 0.012 |
| 2024-07 | 0.019 | 0.014 |
| 2025-01 | 0.019 | 0.013 |
Ephemeris comparison
Difference between NIMAv4 and JPL60 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.