(1867) Deiphobus
This object has a more recent orbit available here
Object
| Object | (1867) Deiphobus |
| Diameter(1) | 118 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 8.30 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.127048 ± 0.000000 au |
| Eccentricity | 0.044332875 ± 0.000000062 |
| Inclination | 26.914966181 ± 0.000006704 ° |
| Longitude of ascending node | 283.709872 ± 0.000012 ° |
| Argument of perihelia | 359.096726 ± 0.000073 ° |
| Mean anomaly | 281.072787 ± 0.000070 ° |
| Orbital period | 11.61 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 1867_Deiphobus_nima_v5.bsp |
| Date of first observation | 1971-03-03 |
| Date of last observation | 2022-11-07 |
| Number of observations used in the fit | 2911 |
| Number of rejected observations | 16 |
| Number of DES observations | 0 |
| Number of MPC observations | 2923 |
| Number of unpublished observations | 4 |
| RMS of observations | 0.430 arcsec |
Residuals
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 | 0.019 | 0.017 |
| 2022-07 | 0.027 | 0.025 |
| 2023-01 | 0.020 | 0.018 |
| 2023-07 | 0.031 | 0.026 |
| 2024-01 | 0.027 | 0.024 |
| 2024-07 | 0.037 | 0.026 |
| 2025-01 | 0.039 | 0.029 |
| 2025-07 | 0.040 | 0.023 |
| 2026-01 | 0.051 | 0.029 |
Ephemeris comparison
Difference between NIMAv5 and JPL87 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.