(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 0.047466875 ± 0.000000048
Inclination 2.668335423 ± 0.000001153 °
Longitude of ascending node 179.180422 ± 0.000123 °
Argument of perihelia 76.749719 ± 0.000137 °
Mean anomaly 50.003938 ± 0.000056 °
Orbital period 11.94 yr

Ephemeris & Observations

Ephemeris version NIMAv5
Observation file (documentation) omc_ast_NIMAv5.txt
bsp file 2357_Phereclos_nima_v5.bsp
Date of first observation 1929-09-29
Date of last observation 2022-07-11
Number of observations used in the fit 3393
Number of rejected observations 19
Number of DES observations 0
Number of MPC observations 3396
Number of unpublished observations 16
RMS of observations 0.510 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2022-01 0.007 0.006
2022-07 0.019 0.015
2023-01 0.017 0.014
2023-07 0.030 0.022
2024-01 0.027 0.020
2024-07 0.035 0.023
2025-01 0.036 0.023
2025-07 0.037 0.018
2026-01 0.044 0.019

Ephemeris comparison

residual plot

Difference between NIMAv5 and JPL65 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.