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 ]  
74985 (1999 TD251)
Classification: Main-belt Asteroid          SPK-ID: 2074985
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1374067460635699 5.4485e-08  
a 2.54213076136398 1.7551e-08 au
q 2.19282484537685 1.3457e-07 au
i 12.32962019672219 5.596e-06 deg
node 349.6098980050256 2.5239e-05 deg
peri 250.7595088848786 3.8716e-05 deg
M 86.82915913274337 3.5378e-05 deg
tp 2458243.425900009373
(2018-May-04.92590001)
0.00014537 TDB
period 1480.455152169618
4.05
1.5331e-05
4.197e-08
d
yr
n .2431684603700539 2.5182e-09 deg/d
Q 2.89143667735111 1.9962e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1088  
   data-arc span      15587 days (42.67 yr)  
   first obs. used      1977-03-12  
   last obs. used      2019-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43948  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 06:50:13  

Additional Information
 Earth MOID = 1.21803 au 
 Jupiter MOID = 2.21793 au 
 T_jup = 3.400 
[ 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 14.2   n/a MPO395680  

74985 (1999 TD251)          Discovered 1999-Oct-05 by LINEAR at Socorro
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TD251 = 1977 EN8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-13 06:25 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin