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 ]  
15448 Siegwarth (1998 XT21)
Classification: Main-belt Asteroid          SPK-ID: 2015448
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01769061542524613 3.4678e-08  
a 2.668785171281507 1.0123e-08 au
q 2.621572719163767 9.484e-08 au
i 2.522394882404521 3.1468e-06 deg
node 272.0848861500392 7.7499e-05 deg
peri 258.9837985298915 0.00011892 deg
M 314.7040498343149 8.9907e-05 deg
tp 2459400.866782409251
(2021-Jul-05.36678241)
0.00039751 TDB
period 1592.461167134882
4.36
9.0609e-06
2.481e-08
d
yr
n .2260651671950678 1.2863e-09 deg/d
Q 2.715997623399248 1.0302e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1848  
   data-arc span      12342 days (33.79 yr)  
   first obs. used      1987-05-30  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49046  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 00:58:44  

Additional Information
 Earth MOID = 1.6257 au 
 Jupiter MOID = 2.25371 au 
 T_jup = 3.380 
[ 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 14.27   n/a E2021B10  
diameter diameter 7.629 km 0.167 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.070   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15448 Siegwarth           Discovered 1998 Dec. 10 by Spacewatch at Kitt Peak.
James David Siegwarth (b. 1934), a physicist at the National Institute of Standards and Technology in Boulder, devoted 37 years to cryogenics and dilution refrigeration research. In retirement, his scientific work continues, including the discovery of a new species of dinosaur, Drinker nisti.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040713/MPCPages.arcLast Updated: 2004-07-14

[ show close-approach data ]
Alternate Designations
 1998 XT21 = 1987 KP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-16 12:54 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin