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 ]  
18721 (1998 HC146)
Classification: Outer Main-belt Asteroid          SPK-ID: 2018721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05474353179014329 3.5059e-08  
a 3.205075485370432 1.9089e-08 au
q 3.029618333647247 1.1713e-07 au
i 7.2212833845922 3.909e-06 deg
node 106.0145213698687 3.5395e-05 deg
peri 153.387929833968 5.701e-05 deg
M 302.9555780912403 4.6372e-05 deg
tp 2459532.598185730396
(2021-Nov-14.09818573)
0.00027047 TDB
period 2095.828879713541
5.74
1.8724e-05
5.126e-08
d
yr
n .1717697487063949 1.5346e-09 deg/d
Q 3.380532637093617 2.0134e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1450  
   data-arc span      8802 days (24.10 yr)  
   first obs. used      1997-02-15  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53891  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:46:26  

Additional Information
 Earth MOID = 2.01438 au 
 Jupiter MOID = 1.68285 au 
 T_jup = 3.178 
[ 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 13.64   n/a E2021B10  
diameter diameter 11.190 km 0.527 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.035   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18721 (1998 HC146)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HC146 = 1997 EW36 
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-21 17:41 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin