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JPL Small-Body Database Browser
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21744 Meliselinger (1999 RF168)
Classification: Main-belt Asteroid          SPK-ID: 2021744
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1782965343816507 2.7381e-08  
a 2.420062946101284 9.0047e-09 au
q 1.988574109825978 6.6851e-08 au
i 2.339015338253874 4.2741e-06 deg
node 141.5953182190912 8.6882e-05 deg
peri 113.6327650486864 8.7902e-05 deg
M 253.4533096210174 1.4185e-05 deg
tp 2459407.482638752860
(2021-Jul-11.98263875)
5.5175e-05 TDB
period 1375.113102339319
3.76
7.6749e-06
2.101e-08
d
yr
n .2617966474085471 1.4612e-09 deg/d
Q 2.851551782376591 1.061e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1380  
   data-arc span      9937 days (27.21 yr)  
   first obs. used      1992-11-18  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55965  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:30:23  

Additional Information
 Earth MOID = .975179 au 
 Jupiter MOID = 2.1994 au 
 T_jup = 3.491 
[ 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 15.0   n/a MPO302197  
diameter diameter 2.761 km 0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.279   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21744 Meliselinger           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Melissa C. Selinger (b. 1987) was awarded second place in the 2005 Intel International Science and Engineering Fair for her behavioral and social sciences project. She attends the Wellington High School, Wellington, Florida, 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: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 RF168 = 1998 FF20 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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