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21770 Wangyiran (1999 RF211)
Classification: Main-belt Asteroid          SPK-ID: 2021770
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04845408039058222 4.5521e-08  
a 2.352315885950865 8.7037e-09 au
q 2.238336582908959 1.0798e-07 au
i 5.064323767862965 4.017e-06 deg
node 293.6611498663196 5.4156e-05 deg
peri 71.13862428334524 6.7811e-05 deg
M 327.3150341241177 4.2587e-05 deg
tp 2459320.143035815837
(2021-Apr-15.64303582)
0.00015604 TDB
period 1317.776896486924
3.61
7.3138e-06
2.002e-08
d
yr
n .2731873665107713 1.5162e-09 deg/d
Q 2.466295188992772 9.1255e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1773  
   data-arc span      8740 days (23.93 yr)  
   first obs. used      1997-01-10  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46752  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:53:00  

Additional Information
 Earth MOID = 1.23917 au 
 Jupiter MOID = 2.73827 au 
 T_jup = 3.550 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.46   n/a E2021B10  
diameter diameter 3.728 km 0.597 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 7.862 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.242   0.118 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21770 Wangyiran           Discovered 1999 Sept. 8 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Wang YiRan (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his physics project. He attends the High School Affiliated to Renmin University of China, Beijing, China.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

Alternate Designations
 1999 RF211 = 1998 KB23 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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