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21449 Hemmick (1998 HQ22)
Classification: Main-belt Asteroid          SPK-ID: 2021449
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04439134289423873 4.0461e-08  
a 2.300206213395392 6.6622e-09 au
q 2.198096970649098 9.4774e-08 au
i 3.219341228219146 2.6996e-06 deg
node 71.70196024375443 7.1441e-05 deg
peri 280.6243187224803 7.733e-05 deg
M 24.57117788038418 2.9329e-05 deg
tp 2459113.529481263846
(2020-Sep-21.02948126)
0.00010388 TDB
period 1274.232228403286
3.49
5.536e-06
1.516e-08
d
yr
n .2825230691669983 1.2274e-09 deg/d
Q 2.402315456141685 6.958e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1218  
   data-arc span      16499 days (45.17 yr)  
   first obs. used      1975-11-05  
   last obs. used      2021-01-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53007  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:44  

Additional Information
 Earth MOID = 1.19289 au 
 Jupiter MOID = 2.74607 au 
 T_jup = 3.588 
[ 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 15.89   n/a E2020-QM5  

21449 Hemmick           Discovered 1998 Apr. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Lucinda Hemmick mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Longwood High School, Middle Island, New York.
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

Alternate Designations
 1998 HQ22 = 1975 VG10 = 1994 AC10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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