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 ]  
20336 Gretamills (1998 HY61)
Classification: Main-belt Asteroid          SPK-ID: 2020336
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 .1830805972903882 4.7218e-08  
a 2.635689590903503 1.5002e-08 au
q 2.153145966328831 1.2861e-07 au
i 2.152899781566906 5.1794e-06 deg
node 183.6534637653453 0.00011188 deg
peri 177.8438685912972 0.00011247 deg
M 325.0361621549644 1.4689e-05 deg
tp 2459352.294632703555
(2021-May-17.79463270)
6.4573e-05 TDB
period 1562.931049373879
4.28
1.3344e-05
3.653e-08
d
yr
n .2303364567133133 1.9665e-09 deg/d
Q 3.118233215478175 1.7748e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1139  
   data-arc span      10510 days (28.77 yr)  
   first obs. used      1991-11-07  
   last obs. used      2020-08-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55692  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:17:25  

Additional Information
 Earth MOID = 1.14866 au 
 Jupiter MOID = 2.33905 au 
 T_jup = 3.373 
[ 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 14.53   n/a E2021B10  

20336 Gretamills           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Greta Mills mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Hanover High School, Hanover, New Hampshire.
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 HY61 = 1991 XR3 = 1999 RV217 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-21 10:04 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin