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46554 (1990 SZ8)
Classification: Main-belt Asteroid          SPK-ID: 2046554
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1511164232493485 4.4236e-08  
a 2.971690884163127 1.998e-08 au
q 2.522619586745702 1.3157e-07 au
i 8.200824260013743 5.529e-06 deg
node 32.92570010991632 2.953e-05 deg
peri 289.4790152865727 3.5696e-05 deg
M 312.0318392492785 2.3229e-05 deg
tp 2459249.818462919906
(2021-Feb-04.31846292)
0.00012166 TDB
period 1871.129625286208
5.12
1.8871e-05
5.167e-08
d
yr
n .1923971461597347 1.9404e-09 deg/d
Q 3.420762181580553 2.2999e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1028  
   data-arc span      10955 days (29.99 yr)  
   first obs. used      1990-09-14  
   last obs. used      2020-09-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50956  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:46:44  

Additional Information
 Earth MOID = 1.52564 au 
 Jupiter MOID = 1.97772 au 
 T_jup = 3.230 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .150083988541765 4.4402e-08  
q 2.524198450133407 1.3139e-07 au
tp 2457383.273326231781
(2015-Dec-26.77332623)
0.00011569 TDB
node 32.95328265636566 2.9508e-05 deg
peri 290.1554164067805 3.5698e-05 deg
i 8.204698170406571 5.5312e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1028  
   data-arc span      10955 days (29.99 yr)  
   first obs. used      1990-09-14  
   last obs. used      2020-09-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50956  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:46:44  

Additional Information
 Jupiter MOID = 1.97772 au 
 T_jup = 3.230 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.971576642973366E-15 -5.783558928702863E-15 2.142394703816102E-12 5.536086302586646E-15 3.1671210779988E-13 1.131189343231017E-15
q -5.783558928702863E-15 1.72641930780276E-14 -5.891366243591267E-12 -1.774044878967813E-14 -8.75480178552259E-13 -2.397749233278658E-15
tp 2.142394703816102E-12 -5.891366243591267E-12 1.338338859067647E-8 1.659941908023586E-11 2.333454311833851E-9 -3.838240743474724E-13
node 5.536086302586646E-15 -1.774044878967813E-14 1.659941908023586E-11 8.707415971970657E-10 -8.588049982523998E-10 -4.779865527184668E-12
peri 3.1671210779988E-13 -8.75480178552259E-13 2.333454311833851E-9 -8.588049982523998E-10 1.274339971127165E-9 4.604790302869909E-12
i 1.131189343231017E-15 -2.397749233278658E-15 -3.838240743474724E-13 -4.779865527184668E-12 4.604790302869909E-12 3.059466485374873E-11

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 14.3   n/a MPO436107  
diameter diameter 3.764 km 0.469 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.286   0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

46554 (1990 SZ8)          Discovered 1990-Sep-22 by Elst, E. W. at La Silla
Reference: 20020921/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1990 SZ8 = 2001 YY121 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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