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21550 Laviolette (1998 QS44)
Classification: Main-belt Asteroid          SPK-ID: 2021550
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07588814310934368 1.5447e-08  
a 2.767035248595533 1.1624e-08 au
q 2.557050081661517 4.1096e-08 au
i 6.15801575441402 8.1206e-07 deg
node 329.3329210950234 5.4165e-06 deg
peri 241.4128436846769 1.607e-05 deg
M 72.82690780411774 1.3481e-05 deg
tp 2458860.397492551973
(2020-Jan-11.89749255)
6.267e-05 TDB
period 1681.204191871059
4.60
1.0594e-05
2.9e-08
d
yr
n .2141322283995414 1.3493e-09 deg/d
Q 2.977020415529549 1.2506e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2229  
   data-arc span      13174 days (36.07 yr)  
   first obs. used      1984-08-21  
   last obs. used      2020-09-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46732  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:00:05  

Additional Information
 Earth MOID = 1.5582 au 
 Jupiter MOID = 2.02216 au 
 T_jup = 3.326 
[ 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 13.07   n/a E2021B10  
diameter diameter 10.122 km 0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 13.61 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:
[Stephens, R.D.; French, L.M.; James, D.; Connour, K.; Warner, B.D. (2016) Minor Planet Bull. 43, 10-15.]
geometric albedo albedo 0.119   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21550 Laviolette           Discovered 1998 Aug. 17 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Jessica Lynn Laviolette (b. 1987) was awarded first place in the 2006 Intel International Science and Engineering Fair for her engineering project. She attends the Brandon High School, Ortonville, Michigan, 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 QS44 = 1984 QG = 1996 BQ7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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