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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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2047800181202286 6.3549e-08  
a 2.681376626554782 1.3293e-08 au
q 2.132284272381737 1.7007e-07 au
i 11.4090562422157 5.8368e-06 deg
node 345.6062709944892 2.2098e-05 deg
peri 17.82973664596139 2.4369e-05 deg
M 190.8294399160397 9.5507e-06 deg
tp 2459954.128722869778
(2023-Jan-09.62872287)
4.3512e-05 TDB
period 1603.74441095702
4.39
1.1926e-05
3.265e-08
d
yr
n .2244746716125254 1.6693e-09 deg/d
Q 3.230468980727828 1.6016e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1296  
   data-arc span      16701 days (45.72 yr)  
   first obs. used      1974-09-20  
   last obs. used      2020-06-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46947  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:57:49  

Additional Information
 Earth MOID = 1.13045 au 
 Jupiter MOID = 2.23818 au 
 T_jup = 3.318 
[ 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 13.94   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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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
2117-Jan-27 10:22 < 00:01 Psych 0.0475655279193853 0.0475573154960221 0.0475737433220879 3.91744543609417 3.91744537116231 2494304.931931955 0.782236168313837 724.122970768822 49.209376786674 55.7836468150512 119586.763208115 T 23 CATAB v2.0f-lin.ifort 2020-Nov-13 03:57:53 2020-Nov-13 03:57

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