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21784 (1999 SO1)
Classification: Main-belt Asteroid          SPK-ID: 2021784
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08708809925966572 1.3899e-08  
a 2.712624344368117 1.1508e-08 au
q 2.4763870462116 4.085e-08 au
i 6.420105682956312 1.3674e-06 deg
node 27.73210603288901 7.5024e-06 deg
peri 44.80596128038354 1.5628e-05 deg
M 221.302714260942 1.6685e-05 deg
tp 2459829.207108514785
(2022-Sep-06.70710851)
7.7199e-05 TDB
period 1631.860045849373
4.47
1.0385e-05
2.843e-08
d
yr
n .2206071537296707 1.4039e-09 deg/d
Q 2.948861642524633 1.2511e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1821  
   data-arc span      10936 days (29.94 yr)  
   first obs. used      1990-09-15  
   last obs. used      2020-08-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49435  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:53:24  

Additional Information
 Earth MOID = 1.49486 au 
 Jupiter MOID = 2.28285 au 
 T_jup = 3.348 
[ 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 13.45   n/a E2021B10  
diameter diameter 5.557 km 0.341 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.208   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21784 (1999 SO1)          Discovered 1999-Sep-17 by Korlevic, K. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 SO1 = 1990 RM16 = 1997 EH57 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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