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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09971373061332252 3.5491e-08  
a 2.685695456976584 1.2845e-08 au
q 2.417894743670197 9.6156e-08 au
i 13.03872288844817 5.0257e-06 deg
node 191.1992052597885 1.7758e-05 deg
peri 309.4878168859812 3.113e-05 deg
M 210.7076665443738 2.5326e-05 deg
tp 2459667.181768903105
(2022-Mar-28.68176890)
0.00011346 TDB
period 1607.620640991951
4.40
1.1534e-05
3.158e-08
d
yr
n .22393342734009 1.6066e-09 deg/d
Q 2.953496170282971 1.4126e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1405  
   data-arc span      23735 days (64.98 yr)  
   first obs. used      1954-09-06  
   last obs. used      2019-08-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48862  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:33:33  

Additional Information
 Earth MOID = 1.44963 au 
 Jupiter MOID = 2.09213 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 13.6   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2008-Apr-02 22:42 < 00:01 David 0.0195440005353612 0.0195433998773252 0.0195446012123839 6.65665974222302 6.65665962610137 2454559.446014880 0.386300555273074 72.9221929865487 26.6380865949648 -78.377601895306 107770.692979126 T 29 CATAB v2.0f-lin.ifort 2020-Feb-22 22:33:53 2020-Feb-22 22:33

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