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18946 Massar (2000 QM75)
Classification: Main-belt Asteroid          SPK-ID: 2018946
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1774937793855335 3.694e-08  
a 3.048433112790734 1.4701e-08 au
q 2.507355198397501 1.1484e-07 au
i .5197820627650306 3.9921e-06 deg
node 340.5309032418723 0.00046487 deg
peri 45.13165403432546 0.00046501 deg
M 263.1370725224286 1.3341e-05 deg
tp 2459723.580490401526
(2022-May-24.08049040)
7.4344e-05 TDB
period 1944.076866643868
5.32
1.4063e-05
3.85e-08
d
yr
n .1851778631682817 1.3395e-09 deg/d
Q 3.589511027183968 1.731e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1254  
   data-arc span      14831 days (40.61 yr)  
   first obs. used      1979-11-16  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56864  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:42:58  

Additional Information
 Earth MOID = 1.51027 au 
 Jupiter MOID = 1.86754 au 
 T_jup = 3.213 
[ 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 14.19   n/a E2021B10  
diameter diameter 8.684 km 0.228 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.054   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18946 Massar           Discovered 2000 Aug. 24 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Sonny Raye Massar (b. 1984) was awarded fourth place in the 2003 Intel International Science and Engineering Fair for her behavioral and social sciences team project. She attends the Francis Howell North High School, St. Charles, Missouri, 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: 20040830/MPCPages.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 2000 QM75 = 1979 WH1 = 1992 EO27 = 1995 UZ42 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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