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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 | 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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2047800189237142 6.3333e-08  
a 2.681376626138481 1.327e-08 au
q 2.132284269896238 1.6953e-07 au
i 11.40905624146724 5.8234e-06 deg
node 345.6062711657466 2.2072e-05 deg
peri 17.82973631781979 2.4323e-05 deg
M 190.8294398887525 9.5359e-06 deg
tp 2459954.128722815830
(2023-Jan-09.62872282)
4.3455e-05 TDB
period 1603.744410583532
4.39
1.1905e-05
3.259e-08
d
yr
n .2244746716648021 1.6664e-09 deg/d
Q 3.230468982380724 1.5988e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1304  
   data-arc span      16946 days (46.40 yr)  
   first obs. used      1974-09-20  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46844  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:28:21  

Additional Information
 Earth MOID = 1.13045 au 
 Jupiter MOID = 2.23818 au 
 T_jup = 3.318 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457184.5 (2015-Jun-11.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2027820000572022 6.3224e-08  
q 2.139386540916389 1.6886e-07 au
tp 2456740.011894640075
(2014-Mar-23.51189464)
4.5002e-05 TDB
node 345.6782936069682 2.2033e-05 deg
peri 17.00524382336159 2.4386e-05 deg
i 11.41819847197139 5.8192e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1304  
   data-arc span      16946 days (46.40 yr)  
   first obs. used      1974-09-20  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46844  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:28:21  

Additional Information
 Jupiter MOID = 2.23818 au 
 T_jup = 3.318 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.997315378890376E-15 -1.065537910334894E-14 1.217806817850297E-13 3.765559257325359E-14 -1.448012822850675E-13 -8.672509272598642E-15
q -1.065537910334894E-14 2.851274120256111E-14 -4.491783206808452E-13 -1.000756969154032E-13 3.672418749392699E-13 2.361401679715212E-14
tp 1.217806817850297E-13 -4.491783206808452E-13 2.02517829895155E-9 2.71311367350146E-12 4.695572614458625E-10 -3.010856677914382E-12
node 3.765559257325359E-14 -1.000756969154032E-13 2.71311367350146E-12 4.854576363068264E-10 -4.762655291064063E-10 2.901100730920406E-11
peri -1.448012822850675E-13 3.672418749392699E-13 4.695572614458625E-10 -4.762655291064063E-10 5.947009341912419E-10 -2.89076684559229E-11
i -8.672509272598642E-15 2.361401679715212E-14 -3.010856677914382E-12 2.901100730920406E-11 -2.89076684559229E-11 3.386333255214479E-11

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 13.94   n/a E2021B10  
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

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