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
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 ]  
21873 Jindrichuvhradec (1999 UU3)
Classification: Main-belt Asteroid          SPK-ID: 2021873
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2061616452171212 3.6004e-08  
a 3.154769297732616 1.819e-08 au
q 2.504376869031598 1.169e-07 au
i 4.46123602245087 3.8644e-06 deg
node 238.0297878772292 5.5548e-05 deg
peri 130.5274089488315 5.644e-05 deg
M 265.9769599731516 1.23e-05 deg
tp 2459535.041740675318
7.3001e-05 TDB
period 2046.679479712255
n .1758946642933132 1.5213e-09 deg/d
Q 3.805161726433634 2.194e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1562  
   data-arc span      13383 days (36.64 yr)  
   first obs. used      1982-09-19  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50247  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:03:03  

Additional Information
 Earth MOID = 1.50672 au 
 Jupiter MOID = 1.69795 au 
 T_jup = 3.169 
[ 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 13.1   n/a MPO302198  
diameter diameter 7.183 km 0.136 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 50.587 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.237   0.088 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

21873 Jindřich{u°}vhradec           Discovered 1999 Oct. 29 by J. Ticha and M. Tichy at Klet.
Jindřich{u°}v Hradec is the pleasant south Bohemian town founded in the thirteenth century, known for its Renaissance château and provost's Gothic church situated precisely on the fifteenth meridian east of Greenwich, as a line across its paving stones shows.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020128/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1999 UU3 = 1982 SN8 = 1988 XA5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Mar-31 11:02 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin