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 ]  
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 
[ 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 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jul-27 04:01 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin