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JPL Small-Body Database Browser
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19991 (1990 SW8)
Classification: Main-belt Asteroid          SPK-ID: 2019991
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .136154722534518 3.6163e-08  
a 2.789758371344092 1.3409e-08 au
q 2.409919594355388 9.9257e-08 au
i 12.07101321489656 4.2529e-06 deg
node 160.3652808331981 1.593e-05 deg
peri 206.558668253709 2.0813e-05 deg
M 128.3614840164067 1.3281e-05 deg
tp 2458393.651140986472
(2018-Oct-02.15114099)
6.2559e-05 TDB
period 1701.955932645235
4.66
1.2271e-05
3.36e-08
d
yr
n .2115213402972639 1.525e-09 deg/d
Q 3.169597148332796 1.5234e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2341  
   data-arc span      10735 days (29.39 yr)  
   first obs. used      1990-09-14  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45233  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:59:15  

Additional Information
 Earth MOID = 1.4132 au 
 Jupiter MOID = 2.29248 au 
 T_jup = 3.284 
[ 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 13.8   n/a MPO324493  
diameter diameter 4.531 km 0.080 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.312   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19991 (1990 SW8)          Discovered 1990-Sep-22 by Elst, E. W. at La Silla
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 SW8 = 1999 RK48 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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