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21791 Mattweegman (1999 SR7)
Classification: Main-belt Asteroid          SPK-ID: 2021791
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .150893562354334 4.1733e-08  
a 2.376970238494124 7.8697e-09 au
q 2.018300731597515 1.0085e-07 au
i 7.600342535363799 4.4477e-06 deg
node 48.71967796272301 2.8951e-05 deg
peri 289.2963515579004 3.1796e-05 deg
M 343.8319375929942 1.4038e-05 deg
tp 2459456.615922934090
(2021-Aug-30.11592293)
5.2242e-05 TDB
period 1338.548288067886
3.66
6.6475e-06
1.82e-08
d
yr
n .26894808592945 1.3356e-09 deg/d
Q 2.735639745390734 9.0571e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1532  
   data-arc span      14564 days (39.87 yr)  
   first obs. used      1981-09-24  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50054  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:45:36  

Additional Information
 Earth MOID = 1.02437 au 
 Jupiter MOID = 2.66592 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 14.40   n/a MPO636390  
diameter diameter 3.350 km 0.120 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.286   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

21791 Mattweegman           Discovered 1999 Sept. 29 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Matt Moraco Weegman (b. 1988) was awarded second place in the 2005 Intel International Science and Engineering Fair for his environmental sciences team project. He attends the Winona Senior High School, Winona, Minnesota, 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

Alternate Designations
 1999 SR7 = 1981 SV8 = 1981 UL25 = 1998 HY19 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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