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21609 Williamcaleb (1999 JQ41)
Classification: Main-belt Asteroid          SPK-ID: 2021609
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2365540634526418 1.512e-08  
a 2.347461409566133 6.3685e-09 au
q 1.792159874334998 3.4651e-08 au
i 6.455374769173501 9.0156e-07 deg
node 192.4673510883615 9.2955e-06 deg
peri 236.1236495153091 9.8099e-06 deg
M 152.8909014117714 3.2844e-06 deg
tp 2458642.575722655977
(2019-Jun-08.07572266)
1.0897e-05 TDB
period 1313.699755768359
3.60
5.346e-06
1.464e-08
d
yr
n .274035218792777 1.1152e-09 deg/d
Q 2.902762944797268 7.875e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2042  
   data-arc span      25725 days (70.43 yr)  
   first obs. used      1950-08-14  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48944  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:02:10  

Additional Information
 Earth MOID = .814612 au 
 Jupiter MOID = 2.43667 au 
 T_jup = 3.514 
[ 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 14.01   n/a E2021B10  
diameter diameter 4.371 km 0.463 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 112. 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2009) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.336   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21609 Williamcaleb           Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
William Caleb Rodgers (b. 1987) was awarded second place in the 2006 Intel International Science and Engineering Fair for his engineering team project. He attends the Paulding County High School, Dallas, Georgia, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1999 JQ41 = 1950 VL = 1986 TN13 = 1995 GB8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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