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JPL Small-Body Database Browser
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49212 (1998 SM121)
Classification: Main-belt Asteroid          SPK-ID: 2049212
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05713559955032008 4.2928e-08  
a 2.293782209875121 8.7147e-09 au
q 2.162725588076047 1.0136e-07 au
i 3.975004643425434 3.6364e-06 deg
node 258.310561007857 6.0098e-05 deg
peri 240.2006840780243 7.0294e-05 deg
M 216.7714113899657 3.6199e-05 deg
tp 2459105.340175025155
(2020-Sep-12.84017503)		 0.00012765 TDB
period 1268.897953772919
3.47		 7.2314e-06
1.98e-08		 d
yr
n .283710757771799 1.6168e-09 deg/d
Q 2.424838831674193 9.2127e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1294  
   data-arc span      7739 days (21.19 yr)  
   first obs. used      1998-09-26  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52775  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 04:17:50  

Additional Information
 Earth MOID = 1.17986 au 
 Jupiter MOID = 2.58899 au 
 T_jup = 3.591 
[ 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 15.0   n/a MPO502483  
diameter diameter 2.339 km 0.279 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.388   0.102 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49212 (1998 SM121)          Discovered 1998-Sep-26 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 SM121 = 2000 EY91 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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