(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 | 0.047466880 ± 0.000000046 |
| Inclination | 2.668335358 ± 0.000001152 ° |
| Longitude of ascending node | 179.180467 ± 0.000118 ° |
| Argument of perihelia | 76.749679 ± 0.000132 ° |
| Mean anomaly | 50.003932 ± 0.000054 ° |
| Orbital period | 11.94 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 2357_Phereclos_nima_v6.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2023-07-04 |
| Number of observations used in the fit | 3894 |
| Number of rejected observations | 21 |
| Number of DES observations | 0 |
| Number of MPC observations | 3899 |
| Number of unpublished observations | 16 |
| RMS of observations | 0.479 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.016 | 0.013 |
| 2023-07 | 0.028 | 0.021 |
| 2024-01 | 0.025 | 0.019 |
| 2024-07 | 0.033 | 0.022 |
| 2025-01 | 0.034 | 0.022 |
| 2025-07 | 0.035 | 0.017 |
| 2026-01 | 0.043 | 0.019 |
| 2026-07 | 0.036 | 0.010 |
| 2027-01 | 0.050 | 0.009 |
Ephemeris comparison
Difference between NIMAv6 and JPL71 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.