(54598) Bienor
This object has a more recent orbit available here
Object
Object | (54598) Bienor |
Diameter(1) | 198 km |
Dynamic class(1) | Centaur |
Absolute magnitude | 7.54 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2459800.5 |
Semi major axis | 16.511359 ± 0.000004 au |
Eccentricity | 0.200887308 ± 0.000000138 |
Inclination | 20.745243965 ± 0.000000760 ° |
Longitude of ascending node | 337.704550 ± 0.000008 ° |
Argument of perihelia | 152.495597 ± 0.000065 ° |
Mean anomaly | 331.074863 ± 0.000046 ° |
Orbital period | 67.09 yr |
Ephemeris & Observations
Ephemeris version | NIMAv19 |
Observation file |
omc_ast_NIMAv19.txt |
bsp file | 54598_Bienor_nima_v19.bsp |
Date of first observation | 1953-01-12 |
Date of last observation | 2023-03-12 |
Number of observations used in the fit | 1251 |
Number of rejected observations | 6 |
Number of DES observations | 0 |
Number of MPC observations | 935 |
Number of unpublished observations | 322 |
RMS of observations | 0.318 arcsec |
Residuals

Residuals in right ascension and declination compared to NIMAv19 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2023-01 | 0.005 | 0.005 |
2023-07 | 0.005 | 0.005 |
2024-01 | 0.008 | 0.006 |
2024-07 | 0.009 | 0.007 |
2025-01 | 0.013 | 0.008 |
2025-07 | 0.013 | 0.009 |
2026-01 | 0.019 | 0.012 |
2026-07 | 0.018 | 0.013 |
2027-01 | 0.027 | 0.018 |
Ephemeris comparison

Difference between NIMAv19 and JPL68 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.