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JPL Small-Body Database Browser
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18738 (1998 SN22)
Classification: Main-belt Asteroid          SPK-ID: 2018738
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09868524798535867 3.6404e-08  
a 2.688219870402701 1.3842e-08 au
q 2.422932225852841 9.9362e-08 au
i 13.03475260571466 5.3113e-06 deg
node 191.2566891907847 1.8e-05 deg
peri 309.5857126653888 3.2782e-05 deg
M 121.0444495401659 2.6734e-05 deg
tp 2458059.200050876993
(2017-Nov-01.70005088)
0.00011985 TDB
period 1609.887792662644
4.41
1.2435e-05
3.405e-08
d
yr
n .2236180693094048 1.7272e-09 deg/d
Q 2.95350751495256 1.5208e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1298  
   data-arc span      23311 days (63.82 yr)  
   first obs. used      1954-09-06  
   last obs. used      2018-07-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48037  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 17:50:42  

Additional Information
 Earth MOID = 1.45495 au 
 Jupiter MOID = 2.09254 au 
 T_jup = 3.329 
[ 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 13.6   n/a MPO435873  
diameter diameter 4.508 km 0.475 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.316   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18738 (1998 SN22)          Discovered 1998-Sep-23 by Visnjan at Visnjan
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 SN22 = 1992 HN4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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