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
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 ]  
91120 (1998 HR99)
Classification: Main-belt Asteroid          SPK-ID: 2091120
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06504141587287089 5.0293e-08  
a 2.719869056851515 1.5796e-08 au
q 2.542964922405083 1.3595e-07 au
i 4.893278144470904 5.2554e-06 deg
node 162.5731155344846 5.6501e-05 deg
peri 30.19340740145504 6.5736e-05 deg
M 356.3502994098243 3.4718e-05 deg
tp 2459017.110211339256
(2020-Jun-16.61021134)
0.00015804 TDB
period 1638.401818008911
4.49
1.4273e-05
3.908e-08
d
yr
n .219726318686276 1.9142e-09 deg/d
Q 2.896773191297948 1.6824e-08 au
  Orbit Determination Parameters
   # obs. used (total)      840  
   data-arc span      8864 days (24.27 yr)  
   first obs. used      1995-10-01  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .57306  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 14:00:32  

Additional Information
 Earth MOID = 1.54412 au 
 Jupiter MOID = 2.05925 au 
 T_jup = 3.351 
[ 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 15.1   n/a MPO337938  
diameter diameter 5.534 km 0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.053   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91120 (1998 HR99)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1998 HR99 = 2000 VS16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Feb-19 17:08 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin