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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09986369339346271 1.8565e-08  
a 2.685566918852758 1.0807e-08 au
q 2.41737628748082 5.2419e-08 au
i 13.03925240357921 8.2345e-07 deg
node 191.1987723864636 3.6384e-06 deg
peri 309.4574782279857 1.2618e-05 deg
M 255.5446538202687 1.4501e-05 deg
tp 2459666.923653751347
(2022-Mar-28.42365375)
6.5855e-05 TDB
period 1607.505230623293
4.40
9.7032e-06
2.657e-08
d
yr
n .2239495045751197 1.3518e-09 deg/d
Q 2.953757550224696 1.1886e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1880  
   data-arc span      24289 days (66.50 yr)  
   first obs. used      1954-09-06  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46431  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:36:12  

Additional Information
 Earth MOID = 1.44898 au 
 Jupiter MOID = 2.09111 au 
 T_jup = 3.330 
[ 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 13.68   n/a MPCxxxxx  
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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