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20335 Charmartell (1998 HK57)
Classification: Main-belt Asteroid          SPK-ID: 2020335
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 .02545978272949372 3.2226e-08  
a 2.511417834580029 1.0682e-08 au
q 2.447477682168646 8.4964e-08 au
i 2.842119918335569 3.9877e-06 deg
node 207.6729616479277 7.6062e-05 deg
peri 239.959257412685 0.00012479 deg
M 7.590270723234202 9.9877e-05 deg
tp 2459169.849917110477
(2020-Nov-16.34991711)
0.00040335 TDB
period 1453.707020811879
3.98
9.2749e-06
2.539e-08
d
yr
n .2476427470226732 1.58e-09 deg/d
Q 2.575357986991412 1.0954e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1208  
   data-arc span      9376 days (25.67 yr)  
   first obs. used      1995-07-03  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52505  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:17:23  

Additional Information
 Earth MOID = 1.46465 au 
 Jupiter MOID = 2.4572 au 
 T_jup = 3.459 
[ 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 14.9   n/a MPO319339  
diameter diameter 2.634 km 0.267 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.336   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20335 Charmartell           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Charles Martell mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Ulysses S. Grant High School, Portland, Oregon.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040415/MPCPages.arcLast Updated: 2004-04-20

Alternate Designations
 1998 HK57 = 1999 RT225 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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