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 ]  
7784 Watterson (1994 PL)
Classification: Main-belt Asteroid          SPK-ID: 2007784
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2353218570259952 3.0274e-08  
a 2.268292921903291 5.9981e-09 au
q 1.734514019242088 6.8147e-08 au
i 23.34939407710258 4.8331e-06 deg
node 220.6627431416855 8.2915e-06 deg
peri 107.119607034569 1.3209e-05 deg
M 93.51738280943363 1.0016e-05 deg
tp 2458276.356754213640
(2018-Jun-06.85675421)
3.4347e-05 TDB
period 1247.806182951884
3.42
4.9494e-06
1.355e-08
d
yr
n .2885063441089566 1.1444e-09 deg/d
Q 2.802071824564494 7.4096e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1736  
   data-arc span      24166 days (66.16 yr)  
   first obs. used      1953-10-08  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46501  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 22:31:11  

Additional Information
 Earth MOID = .857164 au 
 Jupiter MOID = 2.85784 au 
 T_jup = 3.472 
[ 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 13.5   n/a MPO416798  
diameter diameter 5.556 km 0.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 2.539 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
geometric albedo albedo 0.189   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7784 Watterson           Discovered 1994 Aug. 5 by T. B. Spahr at Catalina Station.
Bill Watterson (b. 1958) is the author of the iconic cartoon strip Calvin and Hobbes. Syndicated from 1985 to 1995, this strip is fondly remembered and treasured by the discoverer, and helped him stay awake and sane on long observing nights and during the trials and tribulations of graduate school.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2013-11-17Last Updated: 2014-11-10
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-15 05:54 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin