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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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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08434824759439004 5.783e-08  
a 2.338649129816366 1.6417e-08 au
q 2.141388173978211 1.3246e-07 au
i 6.655470232446351 6.311e-06 deg
node 155.7583857041309 5.0849e-05 deg
peri 267.0918683196187 6.316e-05 deg
M 182.4092586070235 3.6967e-05 deg
tp 2458244.912342486150
(2018-May-06.41234249)
0.00013516 JED
period 1306.309335021386
3.58
1.3755e-05
3.766e-08
d
yr
n .2755855679421493 2.9018e-09 deg/d
Q 2.535910085654522 1.7801e-08 au
  Orbit Determination Parameters
   # obs. used (total)      558  
   data-arc span      8607 days (23.56 yr)  
   first obs. used      1992-09-22  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .53792  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:37:34  

Additional Information
 Earth MOID = 1.16484 au 
 Jupiter MOID = 2.68786 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 15.7 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 ]
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