Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2791911874133814 4.189e-08  
a 3.053187097291487 1.9825e-08 au
q 2.200764166203461 1.3178e-07 au
i 2.202955841266547 4.0029e-06 deg
node 320.3046371773736 0.00012244 deg
peri 58.25490091176158 0.00012263 deg
M 345.2503690977166 1.2264e-05 deg
tp 2459476.337550940948
(2021-Sep-18.83755094)
6.7048e-05 TDB
period 1948.626276084779
5.34
1.8979e-05
5.196e-08
d
yr
n .1847455330035473 1.7994e-09 deg/d
Q 3.905610028379512 2.536e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1413  
   data-arc span      16122 days (44.14 yr)  
   first obs. used      1977-05-18  
   last obs. used      2021-07-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53509  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 09:35:40  

Additional Information
 Earth MOID = 1.20311 au 
 Jupiter MOID = 1.57868 au 
 T_jup = 3.174 
[ 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 13.49   n/a E2021B10  
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

[ show close-approach data ]
Alternate Designations
 1981 EQ21 = 1978 QA1 = 1984 WQ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jul-30 01:24 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin