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10694 Lacerda (1981 EH21)
Classification: Outer Main-belt Asteroid          SPK-ID: 2010694
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 .03566026973588748 3.7383e-08  
a 3.20895554530085 2.1882e-08 au
q 3.09452332498495 1.1706e-07 au
i 22.08220180802998 5.5932e-06 deg
node 177.8800113180372 1.1574e-05 deg
peri 128.4220603379083 8.3759e-05 deg
M 170.5984003772097 8.373e-05 deg
tp 2458005.515232991757
(2017-Sep-09.01523299)
0.00048663 TDB
period 2099.63584260441
5.75
2.1476e-05
5.88e-08
d
yr
n .1714583037187307 1.7538e-09 deg/d
Q 3.32338776561675 2.2663e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1403  
   data-arc span      14499 days (39.70 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48429  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:04:39  

Additional Information
 Earth MOID = 2.11418 au 
 Jupiter MOID = 1.81212 au 
 T_jup = 3.076 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456896.5 (2014-Aug-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03479540242631711 3.6697e-08  
q 3.100652402075279 1.1465e-07 au
tp 2455871.739715222572
(2011-Nov-06.23971522)
0.00049792 TDB
node 177.9846844569973 1.1593e-05 deg
peri 122.8613951410606 8.6154e-05 deg
i 22.03670886230703 5.589e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1403  
   data-arc span      14499 days (39.70 yr)  
   first obs. used      1981-02-09  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48429  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:04:39  

Additional Information
 Jupiter MOID = 1.81212 au 
 T_jup = 3.076 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.346685044426678E-15 -4.135866778228471E-15 1.987832264764645E-12 3.19983889475633E-15 3.46755081667957E-13 2.357057108270208E-15
q -4.135866778228471E-15 1.314379943090882E-14 -4.218546900787147E-12 -1.291568364321223E-14 -7.041872398519704E-13 -1.059271492547845E-14
tp 1.987832264764645E-12 -4.218546900787147E-12 2.479250724445114E-7 2.099818827327064E-11 4.252055047154826E-8 7.308134913846027E-12
node 3.19983889475633E-15 -1.291568364321223E-14 2.099818827327064E-11 1.344090849778347E-10 -1.213481091400209E-10 1.642907502183936E-11
peri 3.46755081667957E-13 -7.041872398519704E-13 4.252055047154826E-8 -1.213481091400209E-10 7.422592925668868E-9 -1.459636069929992E-11
i 2.357057108270208E-15 -1.059271492547845E-14 7.308134913846027E-12 1.642907502183936E-11 -1.459636069929992E-11 3.123737114156098E-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 13.2   n/a MPO458933  
diameter diameter 11.708 km 0.158 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.188 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.089   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

10694 Lacerda           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring.
Pedro Lacerda (b. 1975) is a Lecturer at Queen's University Belfast whose work includes analyzing rotational lightcurves to infer physical properties of trans-Neptunian objects and other small solar system bodies.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-03-12Last Updated: 2017-04-19

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