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65803 Didymos (1996 GT)
Classification: Apollo [NEO, PHA]          SPK-ID: 2065803
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 147 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3836266374011488 9.7908e-09  
a 1.644477952225658 5.2371e-09 au
q 1.013612405133002 1.7893e-08 au
i 3.407707200836149 3.0889e-06 deg
node 73.20386125199495 2.3235e-05 deg
peri 319.3216925766073 2.5562e-05 deg
M 45.04055202778419 1.6785e-05 deg
tp 2459104.130032260559
(2020-Sep-11.63003226)
3.5455e-05 TDB
period 770.2656123041679
2.11
3.6796e-06
1.007e-08
d
yr
n .4673712473325898 2.2326e-09 deg/d
Q 2.275343499318315 7.2462e-09 au
  Orbit Determination Parameters
   # obs. used (total)      932  
   # delay obs. used      6  
   # Doppler obs. used      0  
   data-arc span      8413 days (23.03 yr)  
   first obs. used      1996-04-11  
   last obs. used      2019-04-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .32651  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2019-May-08 10:45:04  

Additional Information
 Earth MOID = .0400068 au 
 Jupiter MOID = 3.16713 au 
 T_jup = 4.201 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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.arcLast Updated: 2004-07-14

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