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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1241043341710578 | 1.4083e-08 | |
| a | 2.359820237698377 | 6.571e-09 | au |
| q | 2.066956318335433 | 3.4828e-08 | au |
| i | 7.31160379892745 | 7.0103e-07 | deg |
| node | 123.3327619762263 | 7.4648e-06 | deg |
| peri | 168.1806395167396 | 1.1994e-05 | deg |
| M | 18.12589749160761 | 9.4069e-06 | deg |
| tp | 2459133.832552494885
(2020-Oct-11.33255249) | 3.4578e-05 | TDB |
| period | 1324.087875535749
3.63 | 5.5304e-06
1.514e-08 | d
yr |
| n | .2718852778969355 | 1.1356e-09 | deg/d |
| Q | 2.652684157061322 | 7.3865e-09 | au |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
14.02 |
|
n/a |
E2021B10 |
|
| diameter |
diameter |
3.783 |
km |
0.200 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M) |
|
| rotation period |
rot_per |
4.187 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] |
| geometric albedo |
albedo |
0.409 |
|
0.078 |
urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M) |
|
|
| 11781 Alexroberts | Discovered 1966 Aug. 7 at Bloemfontein. |
| Scots-born Alexander William Roberts (1857-1938) emigrated in 1883 to South Africa, where he taught at and became principal of Lovedale Training School in Eastern Cape Province. He was one of the most prolific observers of variable stars in the southern hemisphere, and his records are maintained at the Boyden Observatory. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: 20060809/MPCPages.arc | Last Updated: 2007-08-08 |
|
Alternate Designations
| 1966 PL = 1994 CL10 = 1998 HU139 |
|
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