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21189 (1994 JB)
Classification: Main-belt Asteroid          SPK-ID: 2021189
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1930564412181656 4.5653e-08  
a 2.544517751969785 9.2821e-09 au
q 2.053282210158051 1.1697e-07 au
i 3.154156242319211 3.3748e-06 deg
node 65.84458819116841 0.00013303 deg
peri 223.1158927305223 0.00013418 deg
M 191.8822813353444 1.8068e-05 deg
tp 2460088.837159304638
(2023-May-24.33715930)
7.417e-05 TDB
period 1482.540801346654
4.06
8.1122e-06
2.221e-08
d
yr
n .2428263692122314 1.3287e-09 deg/d
Q 3.035753293781519 1.1074e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1029  
   data-arc span      10695 days (29.28 yr)  
   first obs. used      1991-11-01  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5263  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:31:17  

Additional Information
 Earth MOID = 1.03801 au 
 Jupiter MOID = 2.14064 au 
 T_jup = 3.415 
[ 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 15.13   n/a MPCxxxxx  
diameter diameter 2.701 km 0.271 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.242   0.091 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21189 (1994 JB)          Discovered 1994-May-03 by Vagnozzi, A. at Stroncone
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1994 JB = 1998 HH40 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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