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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 
[ 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 13.51   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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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
1923-Sep-19 09:39 00:03 Jupiter 1.80137988067544 1.80137825036643 1.80138151097227 1.25999333550735 0.804467528674163 2423681.901831477 2.64620803280289 1140.52855922085 149.096449239662 8.17726429910651 646937.565328404 T 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
1933-Feb-03 03:07 00:02 Jupiter 1.73099670537501 1.73099540435419 1.73099800706422 1.15915399223721 0.604139912136447 2427106.629925103 2.29828081558956 3355.85827735251 350.680565070754 -51.8690039812383 3213761.35444385 T 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
1981-Oct-02 10:08 < 00:01 Jupiter 1.56590164540658 1.56590123756326 1.56590205324994 0.451009310917567 n/a 2444879.922024794 0.849515314186656 81.7274085181198 20.1302497003112 -87.904717461764 11626121.9583922 F 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
2030-Jun-06 15:06 < 00:01 Jupiter 1.74830893672308 1.7483085049106 1.74830936854163 1.08327419292186 0.452239892995222 2462659.128864104 0.524590890787081 2183.57266238127 396.682126017829 6.73358561980919 1511678.10550899 T 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
2039-Oct-22 14:05 < 00:01 Jupiter 1.77867886924308 1.77867833997518 1.77867939853614 1.28859900179977 0.841468839918372 2466084.086680439 0.801117127274537 577.761664072537 128.265420118801 -52.9240892895175 3769818.295945 T 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
2088-Jun-25 02:56 00:02 Jupiter 1.56826232121953 1.56826189100807 1.56826275143156 0.439370016109734 n/a 2483862.622088864 2.03904920992677 135.514384515288 20.0941812996318 -86.7861093112079 11653927.5746128 F 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
2137-Feb-23 21:23 00:04 Jupiter 1.70534887925789 1.70534731291801 1.70535044559963 0.950834782109253 n/a 2501637.391196309 3.57125816829153 124.882389461593 32.4284203501072 53.8994736114203 6467251.40990487 F 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
2146-Jul-11 05:21 00:04 Jupiter 1.83188974458518 1.83188760377084 1.8318918854997 1.45562741680687 1.09274812172544 2505061.723041773 3.86431233259388 998.786682122571 67.0049621762617 -59.2344876277974 3652444.70059243 T 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32
2195-Mar-19 23:01 00:05 Jupiter 1.58072530439551 1.58072443860453 1.58072617020246 0.453880091578369 n/a 2522845.458764876 4.94065961098967 287.607605552784 20.4323433614893 -82.3816426760055 11468322.5021934 F 24 CATAB v2.0g-lin.ifort 2021-Aug-25 09:32:23 2021-Aug-25 09:32

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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