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21998 (1999 XH37)
Classification: Main-belt Asteroid          SPK-ID: 2021998
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0343776208699702 3.3832e-08  
a 2.591440965056608 1.0144e-08 au
q 2.502353390052983 9.1027e-08 au
i 14.79639605446217 3.3297e-06 deg
node 164.2024889448794 1.3762e-05 deg
peri 334.2208215698798 5.3808e-05 deg
M 354.6468786309186 5.2919e-05 deg
tp 2459419.157656884334
(2021-Jul-23.65765688)
0.000224 TDB
period 1523.738379158057
4.17
8.9471e-06
2.45e-08
d
yr
n .2362610307150747 1.3873e-09 deg/d
Q 2.680528540060234 1.0493e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1924  
   data-arc span      11162 days (30.56 yr)  
   first obs. used      1990-09-18  
   last obs. used      2021-04-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48447  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:38:42  

Additional Information
 Earth MOID = 1.51801 au 
 Jupiter MOID = 2.3037 au 
 T_jup = 3.372 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457624.5 (2016-Aug-24.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03288203993273064 3.3749e-08  
q 2.505577237200347 9.0623e-08 au
tp 2457898.853553001869
(2017-May-25.35355300)
0.00023393 TDB
node 164.2887180190574 1.3753e-05 deg
peri 334.9044873357837 5.6205e-05 deg
i 14.80173135994493 3.3308e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1924  
   data-arc span      11162 days (30.56 yr)  
   first obs. used      1990-09-18  
   last obs. used      2021-04-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48447  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:38:42  

Additional Information
 Jupiter MOID = 2.3037 au 
 T_jup = 3.372 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.138987364370016E-15 -3.042006802493449E-15 -1.301185830240265E-12 -5.966596908383274E-15 -2.633105778643494E-13 -2.639967570152136E-15
q -3.042006802493449E-15 8.212567536657912E-15 3.471062084020727E-12 1.612992632991983E-14 6.982845833041929E-13 7.395965641240934E-15
tp -1.301185830240265E-12 3.471062084020727E-12 5.472151554938657E-8 4.544894637203565E-11 1.27595577816014E-8 1.239725583479653E-11
node -5.966596908383274E-15 1.612992632991983E-14 4.544894637203565E-11 1.891451849765956E-10 -1.720225596923059E-10 -9.349058583581123E-13
peri -2.633105778643494E-13 6.982845833041929E-13 1.27595577816014E-8 -1.720225596923059E-10 3.1589644019595E-9 3.704894927305187E-12
i -2.639967570152136E-15 7.395965641240934E-15 1.239725583479653E-11 -9.349058583581123E-13 3.704894927305187E-12 1.109436076724838E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.92   n/a MPCxxxxx  
diameter diameter 5.534 km 0.152 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.191   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21998 (1999 XH37)          Discovered 1999-Dec-07 by Juels, C. W. at Fountain Hills
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XH37 = 1990 SP12 = 1998 QQ14 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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