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 ]  
57821 (2001 WD44)
Classification: Main-belt Asteroid          SPK-ID: 2057821
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1762178571652531 4.1307e-08  
a 3.18535055061947 1.9665e-08 au
q 2.624034902269148 1.3343e-07 au
i 9.756695782866704 4.4363e-06 deg
node 105.9333478915311 2.9363e-05 deg
peri 324.8861934906257 3.2134e-05 deg
M 67.43192436420725 1.3252e-05 deg
tp 2458611.546816467497
(2019-May-08.04681647)
7.5302e-05 TDB
period 2076.511198396485
5.69
1.9229e-05
5.265e-08
d
yr
n .1733677142112201 1.6054e-09 deg/d
Q 3.746666198969792 2.313e-08 au
  Orbit Determination Parameters
   # obs. used (total)      891  
   data-arc span      9729 days (26.64 yr)  
   first obs. used      1993-05-18  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53446  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 09:36:02  

Additional Information
 Earth MOID = 1.64597 au 
 Jupiter MOID = 1.55588 au 
 T_jup = 3.152 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456981.5 (2014-Nov-20.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1762229359448022 4.1283e-08  
q 2.624268140194532 1.3361e-07 au
tp 2456539.276811656214
(2013-Sep-03.77681166)
7.226e-05 TDB
node 105.9594827293787 2.9355e-05 deg
peri 325.4766263388945 3.2123e-05 deg
i 9.757801907804467 4.4368e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      891  
   data-arc span      9729 days (26.64 yr)  
   first obs. used      1993-05-18  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53446  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 09:36:02  

Additional Information
 Jupiter MOID = 1.55588 au 
 T_jup = 3.152 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.704255943580056E-15 -5.475588304763799E-15 -5.038743776711994E-13 5.860254069262135E-16 -1.073847874219207E-13 -1.165851792513386E-15
q -5.475588304763799E-15 1.785120844435897E-14 1.626981427668317E-12 -4.044618611843619E-15 3.576871815290626E-13 4.260715560006262E-15
tp -5.038743776711994E-13 1.626981427668317E-12 5.221570096497072E-9 -1.112115600445203E-11 9.792756141593634E-10 1.405693928467859E-12
node 5.860254069262135E-16 -4.044618611843619E-15 -1.112115600445203E-11 8.616945640104592E-10 -8.510552628869598E-10 -1.765437734783063E-11
peri -1.073847874219207E-13 3.576871815290626E-13 9.792756141593634E-10 -8.510552628869598E-10 1.031906760316212E-9 1.773104356436437E-11
i -1.165851792513386E-15 4.260715560006262E-15 1.405693928467859E-12 -1.765437734783063E-11 1.773104356436437E-11 1.968514088501283E-11

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 14.0   n/a MPO452955  

57821 (2001 WD44)          Discovered 2001-Nov-18 by LINEAR at Socorro
Reference: 20030318/Numbers.arcLast Updated: 2004-04-19

[ 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 2020-Feb-19 23:25 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin