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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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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.


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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455955.5 (2012-Jan-29.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06090231406107167 3.7977e-08  
q 2.954573675822412 1.1904e-07 au
tp 2455844.835041702009
(2011-Oct-10.33504170)
0.00022912 TDB
node .7539001509823727 3.2802e-05 deg
peri 250.1281558735797 5.1772e-05 deg
i 7.168829642101111 4.7814e-06 deg
  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
 Jupiter MOID = 1.71736 au 
 T_jup = 3.194 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.442267844885979E-15 -4.495688663705071E-15 -3.493511886183927E-13 -3.716442257777051E-15 -7.523774426228257E-14 3.82258369981814E-16
q -4.495688663705071E-15 1.417128032852224E-14 1.779828625728924E-12 1.115777337076708E-14 3.52577232410562E-13 -5.890562748059176E-16
tp -3.493511886183927E-13 1.779828625728924E-12 5.249765403023928E-8 -8.548609188619315E-12 9.196135018101629E-9 -1.16152133370437E-12
node -3.716442257777051E-15 1.115777337076708E-14 -8.548609188619315E-12 1.075943172398671E-9 -1.068942687843386E-9 5.163243954427704E-12
peri -7.523774426228257E-14 3.52577232410562E-13 9.196135018101629E-9 -1.068942687843386E-9 2.680295447618802E-9 -5.361039832324339E-12
i 3.82258369981814E-16 -5.890562748059176E-16 -1.16152133370437E-12 5.163243954427704E-12 -5.361039832324339E-12 2.286179931426066E-11

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

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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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