Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
120904 (1998 SW31)
Classification: Main-belt Asteroid          SPK-ID: 2120904
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02728971491796355 5.3473e-08  
a 3.02647592110644 2.2436e-08 au
q 2.943884256013365 1.7027e-07 au
i .8981085069532163 5.4318e-06 deg
node 207.2454489338352 0.00026849 deg
peri 333.9131430672585 0.00028232 deg
M 252.2216417727888 8.939e-05 deg
tp 2459776.249175006745
(2022-Jul-15.74917501)		 0.00047965 TDB
period 1923.110598562616
5.27		 2.1385e-05
5.855e-08		 d
yr
n .1871967219509235 2.0816e-09 deg/d
Q 3.109067586199517 2.3048e-08 au
   Orbit Determination Parameters
   # obs. used (total)      390  
   data-arc span      8175 days (22.38 yr)  
   first obs. used      1998-08-26  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52025  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:26:10  

Additional Information
 Earth MOID = 1.94486 au 
 Jupiter MOID = 1.84901 au 
 T_jup = 3.244 
[ 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 15.6   n/a MPO493690  

120904 (1998 SW31)          Discovered 1998-Sep-20 by Spacewatch at Kitt Peak
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

[ show close-approach data ]
Alternate Designations
 1998 SW31 = 1999 XX237 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Mar-03 17:18 UT
(server date/time)   		NASA Home Page
Site Manager:   Ryan S. Park
Webmaster:   Alan B. Chamberlin