(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 ± 0.000001 au |
| Eccentricity | 0.045653107 ± 0.000000071 |
| Inclination | 2.668648927 ± 0.000006409 ° |
| Longitude of ascending node | 179.248044 ± 0.000117 ° |
| Argument of perihelia | 74.133285 ± 0.000177 ° |
| Mean anomaly | 313.068096 ± 0.000129 ° |
| Orbital period | 11.90 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 2357_Phereclos_nima_v2.bsp |
| Date of first observation | 1929-09-29 |
| Date of last observation | 2019-08-01 |
| Number of observations used in the fit | 2645 |
| Number of rejected observations | 10 |
| Number of DES observations | 0 |
| Number of MPC observations | 2655 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.579 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.023 | 0.020 |
| 2019-07 | 0.026 | 0.022 |
| 2020-01 | 0.029 | 0.020 |
| 2020-07 | 0.040 | 0.029 |
| 2021-01 | 0.035 | 0.021 |
| 2021-07 | 0.057 | 0.031 |
| 2022-01 | 0.041 | 0.021 |
| 2022-07 | 0.061 | 0.031 |
| 2023-01 | 0.044 | 0.021 |
Ephemeris comparison
Difference between NIMAv2 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.