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 ]  
305940 (2009 HT)
Classification: Outer Main-belt Asteroid          SPK-ID: 2305940
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1271068089071586 5.4539e-08  
a 3.207367001796801 5.7463e-08 au
q 2.799688817204289 1.6568e-07 au
i 18.84260814936613 9.4155e-06 deg
node 31.30729566550463 1.6811e-05 deg
peri 258.8753718899913 3.949e-05 deg
M 194.5054333332891 3.622e-05 deg
tp 2459565.000931276545
(2021-Dec-16.50093128)
0.00021939 TDB
period 2098.076947497752
5.74
5.6384e-05
1.544e-07
d
yr
n .1715856991943741 4.6112e-09 deg/d
Q 3.615045186389314 6.4767e-08 au
  Orbit Determination Parameters
   # obs. used (total)      185  
   data-arc span      5762 days (15.78 yr)  
   first obs. used      2003-04-01  
   last obs. used      2019-01-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55155  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:08:24  

Additional Information
 Earth MOID = 1.86017 au 
 Jupiter MOID = 1.70036 au 
 T_jup = 3.096 
[ 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 15.6   n/a MPO391595  
diameter diameter 5.484 km 0.205 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.034   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

305940 (2009 HT)          Discovered 2009-Apr-16 by CSS at Catalina
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

[ 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
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin