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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 ]

[ show orbit diagram ]
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1934-Jun-04 18:50 00:02 Jupiter 1.8811758738298 1.8811755144386 1.88117623322101 1.91901701282681 1.6679633581466 2427593.284581458 1.8849457341389 97.8237514627404 13.8994910019982 -89.1337335434196 2908893.0794662 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43
1982-Dec-01 02:29 < 00:01 Jupiter 1.90048856397176 1.90048816326983 1.90048896467358 2.10909284197202 1.88597433163257 2445304.603290507 0.769745427786473 50.9953651430349 6.53864162278147 89.2932852487533 2656777.54997607 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43
2040-Nov-22 04:49 < 00:01 Jupiter 1.89840842896576 1.8984080637927 1.89840879413881 1.98298656230359 1.74352676175782 2466480.700750187 0.63780070053488 61.0604699935039 10.4422796377211 88.6837134685305 2974382.16610842 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43
2089-May-20 19:42 00:02 Jupiter 1.87342722815009 1.87342687956697 1.87342757673309 1.96055999424049 1.71451051840859 2484192.320975723 1.75618671498704 70.2144948409837 14.8241833658613 85.1279541669267 2740613.44351104 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43
2137-Nov-17 11:04 00:03 Jupiter 1.94588045742255 1.94587986035676 1.94588105448822 2.48219969863683 2.30015980560965 2501903.961101574 2.86903166173589 52.3647208412257 6.48760809382191 87.9785228882743 1848741.02040154 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43
2147-May-14 15:18 00:03 Jupiter 1.93830770926149 1.93830697566667 1.93830844286006 2.14738199979688 1.93320148521278 2505369.137568906 3.1024861696182 167.070860145682 4.94148905777709 89.965798445625 3024740.98112431 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43
2195-Nov-10 01:58 00:04 Jupiter 1.87186355856117 1.8718631534425 1.87186396368079 1.91450962961208 1.66142787385034 2523080.581993926 4.24672383833423 148.054986781804 15.6692498963873 85.3142909231533 2847149.38970261 T 26 CATAB v2.0f-lin.ifort 2021-Apr-13 02:43:01 2021-Apr-13 02:43

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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