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21561 Masterman (1998 QR93)
Classification: Main-belt Asteroid          SPK-ID: 2021561
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 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1647159259827479 1.5844e-08  
a 2.683639117969221 8.5419e-09 au
q 2.241601015649396 4.1072e-08 au
i 13.95026769179545 6.4453e-07 deg
node 57.81422708268419 3.1836e-06 deg
peri 334.4367974990915 7.6236e-06 deg
M 67.68121970094698 5.4054e-06 deg
tp 2459094.608925386164
(2020-Sep-02.10892539)
2.3969e-05 TDB
period 1605.774649765366
4.40
7.6667e-06
2.099e-08
d
yr
n .2241908601886341 1.0704e-09 deg/d
Q 3.125677220289046 9.9489e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2798  
   data-arc span      24250 days (66.39 yr)  
   first obs. used      1954-12-21  
   last obs. used      2021-05-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40241  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:34:19  

Additional Information
 Earth MOID = 1.25626 au 
 Jupiter MOID = 2.31035 au 
 T_jup = 3.314 
[ 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 13.14   n/a MPCxxxxx  
diameter diameter 7.065 km 1.622 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 171.96 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.245   0.155 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

21561 Masterman           Discovered 1998 Aug. 28 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Mary Masterman (b. 1989) was awarded first place in the 2006 Intel International Science and Engineering Fair for her physics project. She attends the Westmoore High School, Oklahoma City, Oklahoma, 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: 20060711/MPCPages.arcLast Updated: 2006-07-17

Alternate Designations
 1998 QR93 = 1989 TY11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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