Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
20324 Johnmahoney (1998 HF22)
Classification: Main-belt Asteroid          SPK-ID: 2020324
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0410366629630686 3.0213e-08  
a 2.52406895737232 1.0061e-08 au
q 2.420489590273088 7.8377e-08 au
i .6515597812999917 4.1405e-06 deg
node 30.35801892655157 0.00029092 deg
peri 100.2962943933915 0.00029574 deg
M 246.44638331711 5.3549e-05 deg
tp 2459462.507175393269
(2021-Sep-05.00717539)
0.0002187 TDB
period 1464.705290770697
4.01
8.7578e-06
2.398e-08
d
yr
n .2457832317998766 1.4696e-09 deg/d
Q 2.627648324471552 1.0474e-08 au
  Orbit Determination Parameters
   # obs. used (total)      966  
   data-arc span      15048 days (41.20 yr)  
   first obs. used      1979-08-14  
   last obs. used      2020-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56585  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:03:29  

Additional Information
 Earth MOID = 1.43501 au 
 Jupiter MOID = 2.3698 au 
 T_jup = 3.453 
[ 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 15.5   n/a MPO492966  
diameter diameter 2.271 km 0.427 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.237   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20324 Johnmahoney           Discovered 1998 Apr. 20 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
John Mahoney mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Benjamin Banneker High School, Washington, District of Columbia.
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 HF22 = 1991 PC23 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-29 09:30 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin