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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01776275975147985 3.5216e-08  
a 2.668489441569471 1.1588e-08 au
q 2.621089704719512 9.5474e-08 au
i 2.522637535593476 3.3633e-06 deg
node 272.0855839197045 8.7508e-05 deg
peri 259.4378997581591 0.00013358 deg
M 269.0458219824811 0.00010212 deg
tp 2459402.769228527288
(2021-Jul-07.26922853)
0.00045194 TDB
period 1592.196482078375
4.36
1.0371e-05
2.839e-08
d
yr
n .2261027480289831 1.4728e-09 deg/d
Q 2.71588917841943 1.1794e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1582  
   data-arc span      11931 days (32.67 yr)  
   first obs. used      1987-05-30  
   last obs. used      2020-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5106  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 21:18:39  

Additional Information
 Earth MOID = 1.62572 au 
 Jupiter MOID = 2.25477 au 
 T_jup = 3.381 
[ 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 14.2   n/a MPO412297  
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

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Alternate Designations
 1998 XT21 = 1987 KP1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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