(1871) Astyanax
Object
| Object |
(1871) Astyanax |
| Diameter(1) |
34 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
11.27 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
5.230045 ± 0.000000 au |
| Eccentricity |
0.034907105 ± 0.000000055 |
| Inclination |
8.606205565 ± 0.000005998 ° |
| Longitude of ascending node |
145.778031 ± 0.000046 ° |
| Argument of perihelia |
166.200103 ± 0.000117 ° |
| Mean anomaly |
314.702906 ± 0.000108 ° |
| Orbital period |
11.96 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv5 |
| Observation file (documentation) |
omc_ast_NIMAv5.txt |
| bsp file |
1871_Astyanax_nima_v5.bsp |
| Date of first observation |
1971-03-24 |
| Date of last observation |
2023-06-26 |
| Number of observations used in the fit |
2240 |
| Number of rejected observations |
166 |
| Number of DES observations |
20 |
| Number of MPC observations |
2358 |
| Number of unpublished observations |
28 |
| RMS of observations |
0.493 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) |
| 2023-01 |
0.033 |
0.022 |
| 2023-07 |
0.052 |
0.034 |
| 2024-01 |
0.037 |
0.023 |
| 2024-07 |
0.051 |
0.030 |
| 2025-01 |
0.040 |
0.022 |
| 2025-07 |
0.048 |
0.025 |
| 2026-01 |
0.045 |
0.022 |
| 2026-07 |
0.046 |
0.021 |
| 2027-01 |
0.054 |
0.026 |
Ephemeris comparison
Difference between NIMAv5 and JPL45 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