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 ]  
21672 Laichunju (1999 RK14)
Classification: Main-belt Asteroid          SPK-ID: 2021672
[ 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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1911639921364488 3.7347e-08  
a 2.555043865041926 1.0485e-08 au
q 2.06661147971677 9.3416e-08 au
i 8.082649398484548 4.5624e-06 deg
node 166.0664762673484 3.338e-05 deg
peri 237.3218104077707 3.6133e-05 deg
M 32.63779027094122 1.5009e-05 deg
tp 2459065.257181128716
(2020-Aug-03.75718113)		 6.2072e-05 TDB
period 1491.74972905597
4.08		 9.1827e-06
2.514e-08		 d
yr
n .241327343982707 1.4855e-09 deg/d
Q 3.043476250367082 1.249e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1302  
   data-arc span      10745 days (29.42 yr)  
   first obs. used      1991-10-03  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50899  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:51:28  

Additional Information
 Earth MOID = 1.08648 au 
 Jupiter MOID = 2.40745 au 
 T_jup = 3.398 
[ 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 14.6   n/a MPO449112  
diameter diameter 3.792 km 0.827 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.162   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21672 Laichunju           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Lai Chun-Ju (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for his mathematics project. He attends the Taipei Municipal Chien-Kuo Senior High School, Taipei City, Chinese Taipei.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050822/MPCPages.arcLast Updated: 2005-08-26

[ show close-approach data ]
Alternate Designations
 1999 RK14 = 1991 TY5 = 1995 SW2 = 1997 ET18 
[ 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-15 03:16 UT
(server date/time)   		NASA Home Page
Site Manager:   Ryan S. Park
Webmaster:   Alan B. Chamberlin