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209 Dido (A879 UC)
Classification: Main-belt Asteroid          SPK-ID: 2000209
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05607269058358536 3.8229e-08  
a 3.148564467229709 1.3597e-08 au
q 2.972015986076266 1.1922e-07 au
i 7.168801589684464 4.7854e-06 deg
node .6536483245909139 3.2755e-05 deg
peri 249.5077613993394 5.4279e-05 deg
M 197.7457939839393 4.4791e-05 deg
tp 2459920.230893608972
(2022-Dec-06.73089361)
0.00025592 TDB
period 2040.644306419125
5.59
1.3219e-05
3.619e-08
d
yr
n .1764148699837453 1.1427e-09 deg/d
Q 3.325112948383152 1.4359e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2951  
   data-arc span      51505 days (141.01 yr)  
   first obs. used      1879-10-26  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43376  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:32:14  

Additional Information
 Earth MOID = 1.96857 au 
 Jupiter MOID = 1.71736 au 
 T_jup = 3.194 
[ 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 8.2   n/a MPO502154 IRAS observations used: 20
diameter diameter 179.008 km 1.060 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 5.7366 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2001) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2005) Minor Planet Bull. 32, 90-92.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Collaborative Asteroid Lightcurve Link (CALL) (2011) http://www.minorplanetobserver.com/DATA/submissions_results.htm]
geometric albedo albedo 0.028   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.691   0.019 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.98, mean=7.14, max.=12.26) deg.
U-B UB 0.294   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.98, mean=7.14, max.=12.26) deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B Xc   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

209 Dido (A879 UC)          Discovered 1879-Oct-22 by Peters, C. H. F. at Clinton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A879 UC = A909 AB = A909 GB = A912 RB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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