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

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08311687816965266 3.3409e-08  
a 2.340034533106156 9.9093e-09 au
q 2.145538167905192 7.8974e-08 au
i 6.658776834924116 4.622e-06 deg
node 155.6973954527263 3.224e-05 deg
peri 266.9195759155152 4.3048e-05 deg
M 263.419358926738 2.8412e-05 deg
tp 2459551.267550310822
(2021-Dec-02.76755031)
0.00010374 TDB
period 1307.470282953578
3.58
8.3051e-06
2.274e-08
d
yr
n .2753408660170535 1.749e-09 deg/d
Q 2.53453089830712 1.0733e-08 au
  Orbit Determination Parameters
   # obs. used (total)      890  
   data-arc span      10149 days (27.79 yr)  
   first obs. used      1992-09-22  
   last obs. used      2020-07-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53996  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:53:08  

Additional Information
 Earth MOID = 1.16983 au 
 Jupiter MOID = 2.68061 au 
 T_jup = 3.551 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.63   n/a E2021B10  
rotation period rot_per 27.431 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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