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 ]  
139233 (2001 HT18)
Classification: Main-belt Asteroid          SPK-ID: 2139233
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1656391944479144 5.2828e-08  
a 2.636020269320195 1.7205e-08 au
q 2.199391995361624 1.388e-07 au
i 10.76542353119372 7.4222e-06 deg
node 192.8981360240467 2.7559e-05 deg
peri 79.45565285593408 3.4968e-05 deg
M 180.7196315305996 2.3128e-05 deg
tp 2459978.987745051835
(2023-Feb-03.48774505)
0.00010372 TDB
period 1563.22519086352
4.28
1.5304e-05
4.19e-08
d
yr
n .2302931158633243 2.2546e-09 deg/d
Q 3.072648543278766 2.0054e-08 au
  Orbit Determination Parameters
   # obs. used (total)      350  
   data-arc span      9983 days (27.33 yr)  
   first obs. used      1993-09-18  
   last obs. used      2021-01-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60044  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 18:29:52  

Additional Information
 Earth MOID = 1.21298 au 
 Jupiter MOID = 2.09799 au 
 T_jup = 3.353 
[ 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 16.27   n/a MPCxxxxx  
diameter diameter 3.248 km 0.096 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

139233 (2001 HT18)          Discovered 2001-Apr-25 by Kusnirak, P., Pravec, P. at Ondrejov
Reference: 20061205/Numbers.arcLast Updated: 2006-12-13

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-13 06:37 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin