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21887 Dipippo (1999 UH42)
Classification: Main-belt Asteroid          SPK-ID: 2021887
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07211541617363641 3.4145e-08  
a 2.976422646351656 1.7383e-08 au
q 2.76177668850137 1.042e-07 au
i 9.700766628527267 5.441e-06 deg
node 208.2883874292121 2.0293e-05 deg
peri 288.760801864124 4.3428e-05 deg
M 287.2510181333545 4.0113e-05 deg
tp 2459379.522285562333
(2021-Jun-14.02228556)
0.00020994 TDB
period 1875.600445550696
5.14
1.6431e-05
4.499e-08
d
yr
n .1919385340593157 1.6815e-09 deg/d
Q 3.191068604201941 1.8637e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1575  
   data-arc span      15344 days (42.01 yr)  
   first obs. used      1978-10-27  
   last obs. used      2020-10-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49807  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:54:24  

Additional Information
 Earth MOID = 1.79327 au 
 Jupiter MOID = 1.87759 au 
 T_jup = 3.235 
[ 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 13.6   n/a MPO502328  
diameter diameter 7.645 km 0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.145   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21887 Dipippo           Discovered 1999 Oct. 20 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Simonetta Di Pippo (b. 1959) works on solar-system exploration at the Italian Space Agency. She has coordinated the Italian contribution to missions such as Cassini-Huygens, Rosetta, Mars Express, Mars Reconnaissance Orbiter, Venus Express, Dawn and BepiColombo.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

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Alternate Designations
 1999 UH42 = 1978 US6 = 1998 QM83 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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