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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05589767230048263 2.4121e-08  
a 3.148918627852956 1.1621e-08 au
q 2.972901406292347 8.0491e-08 au
i 7.168988041385469 1.0349e-06 deg
node .6448432570643212 8.4297e-06 deg
peri 249.5705778403032 1.7637e-05 deg
M 232.9550485565252 1.743e-05 deg
tp 2459920.770279330674
(2022-Dec-07.27027933)
9.9933e-05 TDB
period 2040.988623419719
5.59
1.1298e-05
3.093e-08
d
yr
n .1763851086033064 9.7639e-10 deg/d
Q 3.324935849413567 1.227e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3303  
   data-arc span      51645 days (141.40 yr)  
   first obs. used      1879-10-26  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41567  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:02:21  

Additional Information
 Earth MOID = 1.96793 au 
 Jupiter MOID = 1.71637 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 8.24   n/a MPCxxxxx 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. 2020-October); 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

[ hide close-approach data ]
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 1.88318257936456 1.88318221878081 1.8831829399483 2.70795766082359 2.53642854300003 2430413.967938297 1.29607381640501 14.2408002508853 9.30248376454225 -39.711283863118 4775278.06276303 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
1952-Jul-30 16:07 00:01 Jupiter 1.74930395004077 1.74930370672667 1.74930419335488 2.94479837399466 2.77550473931826 2434224.171800087 1.06318151967503 27.7965145077843 10.1425761889467 83.7801161220997 6314159.39483991 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
1963-Jan-26 18:09 < 00:01 Jupiter 1.84733811076535 1.8473378220092 1.84733839952161 3.800374196452 3.67774721252846 2438056.256417241 0.82661697493828 37.1242672032746 9.2278119965631 -76.8945998304773 8060670.98901752 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
2037-Feb-27 11:43 < 00:01 Jupiter 1.89360605591034 1.89360580690964 1.89360630491103 2.73682998502427 2.56819491881535 2465116.987857527 0.425593959444525 10.8581619555163 6.43009452670369 -80.9814491561296 5297360.83688224 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
2047-Aug-01 02:40 < 00:01 Jupiter 1.7616935548358 1.76169329778723 1.76169381188437 2.88844731631572 2.7168966883843 2468923.611223654 0.633198850885196 17.3246424430342 9.85852322259468 -84.6591442802865 6341448.96065463 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
2058-Jan-25 01:50 < 00:01 Jupiter 1.84832318738393 1.84832291653322 1.84832345823475 3.80637729594929 3.68401647352289 2472753.576646131 0.798031152192259 41.6799518781408 8.64834298664988 -78.7992071660655 8811753.66276264 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
2132-Feb-29 19:45 00:02 Jupiter 1.89684303889094 1.89684245641053 1.89684362137124 2.76199701460413 2.59529207409178 2499816.322949763 2.11258405334087 19.0280716402261 9.21347269385302 39.6163555377663 3169354.4671302 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
2142-Aug-03 05:55 00:02 Jupiter 1.77218828407687 1.77218796258026 1.77218860557348 2.82109031128764 2.64625107754753 2503623.746604631 2.32448843159304 37.5950180949774 12.7049018251075 60.018541779798 5667655.87706049 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03
2153-Jan-24 22:47 00:02 Jupiter 1.84455367075542 1.84455302121774 1.8445543202954 3.78799838123974 3.66476847545731 2507451.449508678 2.39524443387621 116.803868237472 8.62811008318178 -77.2592934352144 8133264.57180523 T 108 CATAB v2.0g-lin.ifort 2021-May-03 18:03:34 2021-May-03 18:03

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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