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21774 O'Brien (1999 RR217)
Classification: Main-belt Asteroid          SPK-ID: 2021774
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457200.5 (2015-Jun-27.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08377486766533426 5.7928e-08  
a 2.339742073564181 1.7934e-08 AU
q 2.143730490980327 1.3299e-07 AU
i 6.654849057742411 6.9993e-06 deg
node 155.7591782172855 5.2108e-05 deg
peri 267.3305819727518 6.8234e-05 deg
M 72.00235191336571 4.1836e-05 deg
tp 2456939.046424284684
0.00015214 JED
period 1307.225177460372
n .2753924925921289 3.1663e-09 deg/d
Q 2.535753656148035 1.9436e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      515  
   data-arc span      8210 days (22.48 yr)  
   first obs. used      1992-09-22  
   last obs. used      2015-03-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55015  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 17:10:13  

Additional Information
 Earth MOID = 1.16926 AU 
 T_jup = 3.551 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.7 mag n/a MPO333020  

21774 O'Brien           Discovered 1999 Sept. 3 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
David P. O'Brien (b. 1976) is a planetary scientist at the Planetary Science Institute, Tucson. He studies collisional evolution of main-belt minor planets, cratering on (951) Gaspra and other objects, as well as primordial sculpting of the main belt during the planetary accretion process.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Alternate Designations
 1999 RR217 = 1992 SG21 = 1998 HF143 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2015-Dec-01 02:07 UT
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