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21456 Myers (1998 HM46)
Classification: Main-belt Asteroid          SPK-ID: 2021456
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1658150346004848 3.4878e-08  
a 2.278454124885666 7.3538e-09 au
q 1.900652175332132 7.8535e-08 au
i 2.235001228346571 4.0417e-06 deg
node 170.7407934236982 9.8874e-05 deg
peri 64.04315270852253 9.9686e-05 deg
M 191.8236158282463 1.4271e-05 deg
tp 2459787.342245344701
(2022-Jul-26.84224534)
5.1345e-05 TDB
period 1256.200205305493
3.44
6.0817e-06
1.665e-08
d
yr
n .2865785234547485 1.3874e-09 deg/d
Q 2.6562560744392 8.5732e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1005  
   data-arc span      15503 days (42.44 yr)  
   first obs. used      1978-09-02  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5178  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:51  

Additional Information
 Earth MOID = .889297 au 
 Jupiter MOID = 2.33898 au 
 T_jup = 3.588 
[ 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 15.6   n/a MPO337439  

21456 Myers           Discovered 1998 Apr. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Robert Myers mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Manzano High School, Albuquerque, New Mexico.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050224/MPCPages.arcLast Updated: 2005-02-28

[ show close-approach data ]
Alternate Designations
 1998 HM46 = 1978 RK8 = 1999 TL310 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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