(2357) Phereclos


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 (documentation) 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Number of unpublished observations 15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

residual plot

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

residual plot

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.

Previous NIMA versions