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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07216665930072892 3.3712e-08  
a 2.977094246179151 1.6483e-08 au
q 2.76224730000898 1.0362e-07 au
i 9.69971903498204 5.1217e-06 deg
node 208.2818849814126 2.0199e-05 deg
peri 288.5892017279934 4.0363e-05 deg
M 325.8018991770601 3.5945e-05 deg
tp 2459378.732455143169
(2021-Jun-13.23245514)
0.00018759 TDB
period 1876.235296917432
5.14
1.5582e-05
4.266e-08
d
yr
n .191873588878465 1.5935e-09 deg/d
Q 3.191941192349323 1.7673e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1694  
   data-arc span      15427 days (42.24 yr)  
   first obs. used      1978-10-27  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4844  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:54  

Additional Information
 Earth MOID = 1.79371 au 
 Jupiter MOID = 1.8763 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 13.59   n/a E2021B10  
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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