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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 
[ 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1942-Feb-23 11:14 00:01 Jupiter 1.88318274354406 1.88318211399589 1.88318337309213 2.70795787384725 2.53642878490995 2430413.967933929 1.42900037852291 44.2194720128632 16.8183316996558 -69.3076936161759 2647818.26738067 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
1952-Jul-30 16:07 00:01 Jupiter 1.7493039951644 1.74930355787818 1.74930443245072 2.94479884944425 2.77550524730458 2434224.171797985 1.17585615171778 60.7109271726787 17.2025267633606 -82.3860190682255 2744331.69900437 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
1963-Jan-26 18:09 < 00:01 Jupiter 1.8473380142164 1.84733750553097 1.84733852290183 3.80037464178209 3.67774766550265 2438056.256425548 0.910011826798762 71.6751799736531 21.2536732130811 -85.8386248816135 3287989.97097684 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
2037-Feb-27 11:42 < 00:01 Jupiter 1.89360624302341 1.89360581230859 1.89360667373823 2.73683028574328 2.56819525552869 2465116.987783933 0.593938314652231 43.928674247482 9.95868322276842 -72.513886185041 3656214.24680148 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
2047-Aug-01 02:40 < 00:01 Jupiter 1.76169362440268 1.76169319644369 1.76169405236178 2.88844807164319 2.71689749741529 2468923.611043087 0.799058085741582 54.6461246486954 11.0776609507408 -77.2190545859421 2701219.40762635 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
2058-Jan-25 01:50 < 00:01 Jupiter 1.84832319772716 1.84832269964741 1.84832369580701 3.80637813958186 3.68401734518476 2472753.576398251 0.968236288115142 72.7630520907022 20.7762212815749 -85.8480604746087 3324950.35127677 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
2132-Feb-29 19:43 00:03 Jupiter 1.89684288111092 1.89684221854479 1.89684354367694 2.76199575064321 2.59529071367964 2499816.321786636 2.51538420129298 44.5816769861611 19.0214395631342 -75.4777881645849 2215205.04454956 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
2142-Aug-03 05:53 00:03 Jupiter 1.77218825103177 1.77218779557852 1.77218870648503 2.82109260951175 2.6462535232508 2503623.745274251 2.73850379023758 60.9282028295029 26.0218472738659 87.8743390100298 2298498.31810978 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32
2153-Jan-24 22:45 00:03 Jupiter 1.84455410202872 1.84455325962641 1.84455494443355 3.78800130792727 3.66477152916072 2507451.448095296 2.8056925157755 143.502691355258 22.3795456911887 -78.9289633874193 3155243.8241341 T 102 CATAB v2.0f-lin.ifort 2020-Nov-13 04:32:23 2020-Nov-13 04:32

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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