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 ]  
91109 (1998 HG38)
Classification: Main-belt Asteroid          SPK-ID: 2091109
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02816714759988154 4.1651e-08  
a 2.560490471014603 1.4327e-08 au
q 2.488368757989445 1.1172e-07 au
i 15.50795954312515 6.8005e-06 deg
node 18.88780410330756 1.5953e-05 deg
peri 90.81544292870825 0.00018056 deg
M 234.996460072684 0.00017428 deg
tp 2459520.140490204448
(2021-Nov-01.64049020)
0.0007232 TDB
period 1496.52223114941
4.10
1.2561e-05
3.439e-08
d
yr
n .240557736134331 2.019e-09 deg/d
Q 2.632612184039762 1.4731e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1442  
   data-arc span      13043 days (35.71 yr)  
   first obs. used      1983-10-01  
   last obs. used      2019-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50808  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 14:00:32  

Additional Information
 Earth MOID = 1.54308 au 
 Jupiter MOID = 2.38407 au 
 T_jup = 3.384 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.7   n/a MPO320098  
diameter diameter 4.897 km 0.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.293   0.084 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91109 (1998 HG38)          Discovered 1998-Apr-20 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

Alternate Designations
 1998 HG38 = 2000 XU18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Feb-27 08:50 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin