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 ]  
18716 (1998 HV121)
Classification: Main-belt Asteroid          SPK-ID: 2018716
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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09807333919829779 2.3896e-08  
a 3.027534581367712 1.6457e-08 au
q 2.73061415543466 7.7124e-08 au
i 10.94248583639422 1.5169e-06 deg
node 116.16238270 2.0936e-06 deg
peri 239.3115876687704 1.0059e-05 deg
M 339.6009365076123 8.0408e-06 deg
tp 2459309.528446620109
(2021-Apr-05.02844662)
4.3089e-05 TDB
period 1924.119741961999
5.27
1.5689e-05
4.295e-08
d
yr
n .187098542855193 1.5256e-09 deg/d
Q 3.324455007300764 1.8071e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2192  
   data-arc span      10509 days (28.77 yr)  
   first obs. used      1992-03-05  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49014  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:35:49  

Additional Information
 Earth MOID = 1.74202 au 
 Jupiter MOID = 2.09307 au 
 T_jup = 3.209 
[ 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 13.02   n/a MPCxxxxx  
diameter diameter 9.157 km 0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.111   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18716 (1998 HV121)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HV121 = 1999 NJ30 
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-24 07:24 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin