(20000) Varuna
This object has a more recent orbit available here
Object
| Object | (20000) Varuna |
| Diameter(1) | 678 km |
| Dynamic class(1) | cubewano |
| Absolute magnitude | 3.60 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 42.780800 ± 0.000846 au |
| Eccentricity | 0.054124353 ± 0.000002590 |
| Inclination | 17.219677131 ± 0.000173593 ° |
| Longitude of ascending node | 97.369312 ± 0.000181 ° |
| Argument of perihelia | 262.865530 ± 0.017633 ° |
| Mean anomaly | 117.234143 ± 0.018460 ° |
| Orbital period | 279.82 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv9 |
| Observation file |
omc_ast_NIMAv9.txt |
| bsp file | 20000_Varuna_nima_v9.bsp |
| Date of first observation | 1954-11-24 |
| Date of last observation | 2019-02-24 |
| Number of observations used in the fit | 642 |
| Number of rejected observations | 8 |
| Number of DES observations | 0 |
| Number of MPC observations | 402 |
| Number of unpublished observations | 248 |
| RMS of observations | 0.282 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv9 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.054 | 0.021 |
| 2018-07 | 0.042 | 0.023 |
| 2019-01 | 0.068 | 0.025 |
| 2019-07 | 0.054 | 0.027 |
| 2020-01 | 0.083 | 0.030 |
| 2020-07 | 0.068 | 0.031 |
| 2021-01 | 0.100 | 0.034 |
| 2021-07 | 0.084 | 0.035 |
| 2022-01 | 0.118 | 0.038 |
Ephemeris comparison
Difference between NIMAv9 and JPL43 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.