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21696 Ermalmquist (1999 RC52)
Classification: Main-belt Asteroid          SPK-ID: 2021696
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1833610185804464 3.5985e-08  
a 2.310109762342226 6.156e-09 au
q 1.886525683286522 8.3845e-08 au
i 3.541922515916068 3.4181e-06 deg
node 20.22497738228007 6.2906e-05 deg
peri 313.1544077233382 6.3549e-05 deg
M 20.23400501967303 8.9218e-06 deg
tp 2459128.418020835463
(2020-Oct-05.91802084)
3.177e-05 TDB
period 1282.470399409475
3.51
5.1263e-06
1.404e-08
d
yr
n .2807082332393522 1.122e-09 deg/d
Q 2.733693841397929 7.2848e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1862  
   data-arc span      18016 days (49.33 yr)  
   first obs. used      1971-09-16  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4837  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:01  

Additional Information
 Earth MOID = .876768 au 
 Jupiter MOID = 2.63199 au 
 T_jup = 3.560 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.95   n/a E2021B10  
diameter diameter 6.410 km 0.209 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.052   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21696 Ermalmquist           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Eric Ragnarson Malmquist (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for his biochemistry project. He attends the Westside High School, Macon, Georgia, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

Alternate Designations
 1999 RC52 = 1971 SU = 1992 PH5 = 1998 FL39 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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