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181221 (2005 SR270)
Classification: Main-belt Asteroid          SPK-ID: 2181221
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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09740206378302252 7.2572e-08  
a 3.138936396575811 3.7617e-08 au
q 2.833197513465683 2.4294e-07 au
i 6.011243963699782 6.7045e-06 deg
node 56.077955846583 6.0786e-05 deg
peri 298.9618085184123 6.9297e-05 deg
M 275.5346482493765 3.8642e-05 deg
tp 2459677.093697362707
(2022-Apr-07.59369736)
0.00022234 TDB
period 2031.291263157593
5.56
3.6514e-05
9.997e-08
d
yr
n .1772271690079486 3.1858e-09 deg/d
Q 3.444675279685939 4.1281e-08 au
  Orbit Determination Parameters
   # obs. used (total)      339  
   data-arc span      7174 days (19.64 yr)  
   first obs. used      2000-11-02  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5549  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:29:42  

Additional Information
 Earth MOID = 1.8336 au 
 Jupiter MOID = 2.00844 au 
 T_jup = 3.195 
[ 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 15.3   n/a MPO469951  
diameter diameter 5.519 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.044   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

181221 (2005 SR270)          Discovered 2005-Sep-30 by LONEOS at Anderson Mesa
Reference: 20080321/Numbers.arcLast Updated: 2008-03-26

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