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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
25476 Sealfon (1999 XU42)
Classification: Main-belt Asteroid          SPK-ID: 2025476
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1274751622097545 3.6958e-08  
a 2.352969280028641 8.3889e-09 au
q 2.05302413938242 8.678e-08 au
i 2.903811705309123 3.6728e-06 deg
node 249.86350725766 8.1664e-05 deg
peri 139.5070740167413 8.2956e-05 deg
M 156.8767045113592 1.5153e-05 deg
tp 2458026.014899729944
(2017-Sep-29.51489973)
5.4562e-05 TDB
period 1318.32598562934
3.61
7.0502e-06
1.93e-08
d
yr
n .2730735826527335 1.4604e-09 deg/d
Q 2.652914420674861 9.4583e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1154  
   data-arc span      13662 days (37.40 yr)  
   first obs. used      1981-12-04  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54154  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 00:48:18  

Additional Information
 Earth MOID = 1.05853 au 
 Jupiter MOID = 2.76905 au 
 T_jup = 3.544 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.4   n/a MPO337474  

25476 Sealfon           Discovered 1999 Dec. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Adam Benjamin Sealfon (b. 1991) is a finalist in the 2009 Intel Science Talent Search (STS), a science competition for high school seniors, for his computer science project. He attends the Stuyvesant High School, New York, New York.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20090311/MPCPages.arcLast Updated: 2009-03-12

Alternate Designations
 1999 XU42 = 1981 XF1 = 1998 LJ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-23 23:44 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin