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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08338252122338941 6.7431e-08  
a 2.338808899262708 2.2294e-08 AU
q 2.143793116582483 1.5808e-07 AU
i 6.653985504289223 9.8967e-06 deg
node 155.7653747002512 6.0261e-05 deg
peri 267.158035228606 8.5996e-05 deg
M 321.9726566729566 6.3178e-05 deg
tp 2456938.501567162887
(2014-Oct-08.00156716)
0.00022994 JED
period 1306.443201971168
3.58
1.868e-05
5.114e-08
d
yr
n .2755573295929208 3.9401e-09 deg/d
Q 2.533824681942932 2.4153e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      428  
   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      .58984  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Nov-21 07:42:10  

Additional Information
 Earth MOID = 1.16778 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

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Alternate Designations
 1999 RR217 = 1992 SG21 = 1998 HF143 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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