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21860 Joannaguy (1999 TX180)
Classification: Main-belt Asteroid          SPK-ID: 2021860
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 .03173958125656873 3.2638e-08  
a 2.686186374448182 1.1826e-08 au
q 2.600927943746096 8.8331e-08 au
i 3.317348386389761 3.6483e-06 deg
node 123.6535434828864 6.6225e-05 deg
peri 327.1261792448765 0.00010011 deg
M 249.2993038154768 7.7709e-05 deg
tp 2459694.982004351232
(2022-Apr-25.48200435)
0.00034874 TDB
period 1608.06144588033
4.40
1.0619e-05
2.907e-08
d
yr
n .2238720422794035 1.4784e-09 deg/d
Q 2.771444805150268 1.2201e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1887  
   data-arc span      10485 days (28.71 yr)  
   first obs. used      1992-02-26  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51388  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:18:04  

Additional Information
 Earth MOID = 1.61804 au 
 Jupiter MOID = 2.27303 au 
 T_jup = 3.371 
[ 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 13.97   n/a E2021B10  
diameter diameter 4.796 km 0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.232   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21860 Joannaguy           Discovered 1999 Oct. 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Joanna Christine Guy (b. 1991) is a finalist in the 2005 Discovery Channel Young Scientist Challenge (DCYSC), a middle school science competition, for her behavioral science project. She attends the Southern Middle School, Oakland, Maryland.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20051019/MPCPages.arcLast Updated: 2005-10-26

Alternate Designations
 1999 TX180 = 1992 DQ13 = 1998 MU6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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