(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Number of unpublished observations | 15 |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.