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3304 Pearce (1981 EQ21)
Classification: Main-belt Asteroid          SPK-ID: 2003304
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2791911901145243 4.1643e-08  
a 3.053187091643989 1.7395e-08 au
q 2.200764153885601 1.3015e-07 au
i 2.202956128651195 3.9925e-06 deg
node 320.3046202247482 0.00012144 deg
peri 58.25491616157545 0.00012159 deg
M 345.2503727276966 1.0615e-05 deg
tp 2459476.337531070895
(2021-Sep-18.83753107)
5.8012e-05 TDB
period 1948.626270678201
5.34
1.6653e-05
4.559e-08
d
yr
n .1847455335161346 1.5788e-09 deg/d
Q 3.905610029402378 2.2251e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1483  
   data-arc span      16154 days (44.23 yr)  
   first obs. used      1977-05-18  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5258  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 09:32:04  

Additional Information
 Earth MOID = 1.20311 au 
 Jupiter MOID = 1.57868 au 
 T_jup = 3.174 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456380.5 (2013-Mar-29.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2831829092060294 4.1356e-08  
q 2.183522285576148 1.2912e-07 au
tp 2455591.267418062977
(2011-Jan-29.76741806)
3.8229e-05 TDB
node 320.4608914827106 0.00012167 deg
peri 58.74359304934309 0.00012182 deg
i 2.204334181681272 3.9922e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1483  
   data-arc span      16154 days (44.23 yr)  
   first obs. used      1977-05-18  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5258  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 09:32:04  

Additional Information
 Jupiter MOID = 1.57868 au 
 T_jup = 3.174 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.71030482737155E-15 -5.318287952255917E-15 -1.185627966865685E-13 1.070493087558417E-15 -2.010979291879954E-14 -1.64262765575077E-17
q -5.318287952255917E-15 1.66713379895607E-14 5.193456878888461E-13 -2.025529729973023E-15 9.471481470883278E-14 2.075259431158815E-16
tp -1.185627966865685E-13 5.193456878888461E-13 1.461428128343008E-9 -3.924471615009656E-12 2.726973388309528E-10 2.607971150972853E-13
node 1.070493087558417E-15 -2.025529729973023E-15 -3.924471615009656E-12 1.48029276411928E-8 -1.479199846412392E-8 1.018914447007786E-10
peri -2.010979291879954E-14 9.471481470883278E-14 2.726973388309528E-10 -1.479199846412392E-8 1.484011931011083E-8 -1.017596384169547E-10
i -1.64262765575077E-17 2.075259431158815E-16 2.607971150972853E-13 1.018914447007786E-10 -1.017596384169547E-10 1.59372718580094E-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 13.51   n/a MPO636113  
diameter diameter 9.314 km 0.186 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 40.323 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.077   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3304 Pearce (1981 EQ21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 EQ21 = 1978 QA1 = 1984 WQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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