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181960 (1999 UM24)
Classification: Outer Main-belt Asteroid          SPK-ID: 2181960
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03940561481104853 5.0541e-08  
a 3.249483289583014 3.1805e-08 au
q 3.121435402738767 1.5e-07 au
i 21.28099141219883 5.331e-06 deg
node 226.3517930624957 1.1127e-05 deg
peri 209.314392720317 6.18e-05 deg
M 176.9417140147524 6.2529e-05 deg
tp 2458148.907166053671
(2018-Jan-30.40716605)
0.00036757 TDB
period 2139.537430891593
5.86
3.1412e-05
8.6e-08
d
yr
n .1682606692466138 2.4703e-09 deg/d
Q 3.377531176427261 3.3058e-08 au
  Orbit Determination Parameters
   # obs. used (total)      801  
   data-arc span      13225 days (36.21 yr)  
   first obs. used      1984-04-05  
   last obs. used      2020-06-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47016  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:46  

Additional Information
 Earth MOID = 2.14214 au 
 Jupiter MOID = 1.85065 au 
 T_jup = 3.073 
[ show covariance matrix ]

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 13.94   n/a E2021B55  
diameter diameter 7.468 km 0.202 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.115   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

181960 (1999 UM24)          Discovered 1999-Oct-28 by CSS at Catalina
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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