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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08345034034892361 6.063e-08  
a 2.338943262658014 2.2249e-08 AU
q 2.143757651332381 1.4342e-07 AU
i 6.654019408326429 8.9152e-06 deg
node 155.7644364513498 5.4516e-05 deg
peri 267.216123538786 7.7403e-05 deg
M 17.03460248057644 5.7569e-05 deg
tp 2456938.675948827607
(2014-Oct-08.17594883)
0.00020862 JED
period 1306.555785345702
3.58
1.8642e-05
5.104e-08
d
yr
n .2755335853529955 3.9314e-09 deg/d
Q 2.534128873983647 2.4105e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      426  
   data-arc span      7706 days (21.10 yr)  
   first obs. used      1992-09-22  
   last obs. used      2013-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .58743  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 23:05:16  

Additional Information
 Earth MOID = 1.16843 AU 
 T_jup = 3.552 
[ 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 15.6 mag n/a MPO266070  

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 ]
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