(5145) Pholus
This object has a more recent orbit available here
Object
| Object | (5145) Pholus |
| Diameter(1) | 107 km |
| Dynamic class(1) | Centaur |
| Absolute magnitude | 6.96 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460400.5 |
| Semi major axis | 20.284146 ± 0.000056 au |
| Eccentricity | 0.573579460 ± 0.000000821 |
| Inclination | 24.711055709 ± 0.000015892 ° |
| Longitude of ascending node | 119.334431 ± 0.000041 ° |
| Argument of perihelia | 354.619284 ± 0.000144 ° |
| Mean anomaly | 128.300657 ± 0.000559 ° |
| Orbital period | 91.36 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 5145_Pholus_nima_v1.bsp |
| Date of first observation | 1977-07-22 |
| Date of last observation | 2018-04-19 |
| Number of observations used in the fit | 392 |
| Number of rejected observations | 4 |
| Number of DES observations | 0 |
| Number of MPC observations | 396 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.572 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.149 | 0.076 |
| 2023-07 | 0.165 | 0.080 |
| 2024-01 | 0.163 | 0.079 |
| 2024-07 | 0.180 | 0.083 |
| 2025-01 | 0.177 | 0.082 |
| 2025-07 | 0.195 | 0.087 |
| 2026-01 | 0.191 | 0.086 |
| 2026-07 | 0.211 | 0.090 |
| 2027-01 | 0.207 | 0.089 |
Ephemeris comparison
Difference between NIMAv1 and JPL23 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.