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3725 Valsecchi (1981 EA11)
Classification: Main-belt Asteroid          SPK-ID: 2003725
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2047800154089495 6.2994e-08  
a 2.681376625624148 1.3239e-08 au
q 2.132284278911638 1.6869e-07 au
i 11.4090562198231 5.8136e-06 deg
node 345.6062712274824 2.2044e-05 deg
peri 17.82973691530531 2.4267e-05 deg
M 190.8294396384705 9.5242e-06 deg
tp 2459954.128723713959
(2023-Jan-09.62872371)
4.3422e-05 TDB
period 1603.744410122094
4.39
1.1877e-05
3.252e-08
d
yr
n .2244746717293892 1.6624e-09 deg/d
Q 3.230468972336658 1.595e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1316  
   data-arc span      16983 days (46.50 yr)  
   first obs. used      1974-09-20  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46746  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:10:19  

Additional Information
 Earth MOID = 1.13045 au 
 Jupiter MOID = 2.23818 au 
 T_jup = 3.318 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457194.5 (2015-Jun-21.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2027791667929323 6.2876e-08  
q 2.139468641367172 1.6799e-07 au
tp 2456740.040728611624
(2014-Mar-23.54072861)
4.4868e-05 TDB
node 345.6777462072102 2.2004e-05 deg
peri 17.01599734367822 2.4329e-05 deg
i 11.41832346418949 5.8095e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1316  
   data-arc span      16983 days (46.50 yr)  
   first obs. used      1974-09-20  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46746  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:10:19  

Additional Information
 Jupiter MOID = 2.23818 au 
 T_jup = 3.318 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.953420167330627E-15 -1.054206510065341E-14 1.447037588111608E-13 3.704334700791223E-14 -1.360416698595183E-13 -8.547602422384707E-15
q -1.054206510065341E-14 2.822022874634733E-14 -5.082610087443137E-13 -9.851191814841701E-14 3.446846986410044E-13 2.327325117505022E-14
tp 1.447037588111608E-13 -5.082610087443137E-13 2.013156143578678E-9 2.772046726892373E-12 4.652219037481855E-10 -3.008765027695853E-12
node 3.704334700791223E-14 -9.851191814841701E-14 2.772046726892373E-12 4.84188954229144E-10 -4.749830274139407E-10 2.938710876201239E-11
peri -1.360416698595183E-13 3.446846986410044E-13 4.652219037481855E-10 -4.749830274139407E-10 5.918840159738443E-10 -2.92804244547456E-11
i -8.547602422384707E-15 2.327325117505022E-14 -3.008765027695853E-12 2.938710876201239E-11 -2.92804244547456E-11 3.37499942912839E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.95   n/a MPCxxxxx  
diameter diameter 7.259 km 1.429 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 3.57 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Angeli, C.A.; Guimaraes, T.A.; Lazzaro, D.; Duffard, R.; et al. (2001) Astron. J. 121, 2245-2252.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.111   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

3725 Valsecchi (1981 EA11)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 EA11 = 1974 SZ2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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