| 65803 Didymos (1996 GT) |
| Classification: Apollo [NEO, PHA] SPK-ID: 2065803 |
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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 181 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .383697480609711 | 2.7422e-09 | |
| a | 1.644394196638894 | 2.9335e-09 | au |
| q | 1.013444286259321 | 5.1199e-09 | au |
| i | 3.407705711883407 | 1.3274e-06 | deg |
| node | 73.19943499617158 | 9.6759e-06 | deg |
| peri | 319.3188680163129 | 1.1002e-05 | deg |
| M | 136.6502277847489 | 3.5113e-06 | deg |
| tp | 2459104.141860697233
(2020-Sep-11.64186070) | 7.1631e-06 | TDB |
| period | 770.2067669787134
2.11 | 2.061e-06
5.643e-09 | d
yr |
| n | .4674069554233733 | 1.2507e-09 | deg/d |
| Q | 2.275344107018468 | 4.0591e-09 | au |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -1.885839515169381E-14 | 7.227E-15 |
| ALN [SET] | 1. | n/a |
| NK [SET] | 0. | n/a |
| NM [SET] | 2. | n/a |
| NN [SET] | 0. | n/a |
| R0 [SET] | 1. | n/a |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
18.07 |
|
n/a |
MPCxxxxx |
|
| diameter |
diameter |
0.78 |
km |
0.08 |
Richardson et al., 2016, "Dynamical and Physical Properties of 65803 Didymos", LPSC Abstract (submitted) |
uncertainty is published as "10%" |
| bulk density |
density |
2.1 |
g/cm^3 |
0.6 |
Richardson et al., 2016, "Dynamical and Physical Properties of 65803 Didymos", LPSC Abstract (submitted) |
uncertainty is published as "30%" |
| rotation period |
rot_per |
2.2593 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Published Reference List:
[Pravec, P.; et al. (2003) IAUC 8244. (65803)]
[Kitazato, K.; Abe, M.; Mito, H. (2005) Asia-Oceana Geophys. Soc. abstract 58-PS-A1183.]
[Pravec, P.; et al. (2006) Icarus 181, 63-93.] |
| SMASSII spectral type |
spec_B |
Xk |
|
n/a |
Binzel et al. (2004) Meteorit. Planet. Sci. 39, 351-366 |
|
|
| 65803 Didymos | Discovered 1996 Apr. 11 by Spacewatch at Kitt Peak. |
| Greek for "twin", this rapid-rotator Amor possesses a satellite with an orbital period of 11.9 hr. Suspicions arose in the Goldstone delay-Doppler echoes, and these were confirmed with the optical light curve analysis, along with Arecibo radar imaging on 2003 Nov. 23. The name was suggested by J. Montani. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: 20040713/MPCPages.arc | Last Updated: 2004-07-14 |
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