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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2356009961835189 3.0154e-08  
a 2.267870947788429 5.9704e-09 au
q 1.733558293273814 6.782e-08 au
i 23.34929973042019 4.3898e-06 deg
node 220.6506634740074 8.2688e-06 deg
peri 107.1356853562989 1.2431e-05 deg
M 208.914214974123 9.6535e-06 deg
tp 2459524.036587600467
(2021-Nov-05.53658760)		 3.433e-05 TDB
period 1247.45800211375
3.42		 4.9261e-06
1.349e-08		 d
yr
n .2885868697703646 1.1396e-09 deg/d
Q 2.802183602303044 7.377e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1943  
   data-arc span      24340 days (66.64 yr)  
   first obs. used      1953-10-08  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4546  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:44:06  

Additional Information
 Earth MOID = .85696 au 
 Jupiter MOID = 2.85914 au 
 T_jup = 3.473 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456963.5 (2014-Nov-02.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2364011757201364 3.024e-08  
q 1.731786023129986 6.8066e-08 au
tp 2457028.434444486071
(2015-Jan-05.93444449)		 3.0893e-05 TDB
node 220.6982566635179 8.2765e-06 deg
peri 107.0306464454121 1.2391e-05 deg
i 23.33843043273436 4.3888e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      1943  
   data-arc span      24340 days (66.64 yr)  
   first obs. used      1953-10-08  
   last obs. used      2020-05-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4546  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:44:06  

Additional Information
 Jupiter MOID = 2.85914 au 
 T_jup = 3.473 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.144814622487892E-16 -2.053854357357949E-15 3.349675968277259E-13 -7.686268813276131E-15 9.633276323340919E-14 -9.809880066021865E-16
q -2.053854357357949E-15 4.632929009339453E-15 -7.339346882224774E-13 1.69235138912706E-14 -2.117938040304084E-13 2.388826245699139E-15
tp 3.349675968277259E-13 -7.339346882224774E-13 9.543474933107115E-10 -9.550448096640752E-12 2.926113610157565E-10 -3.333176531459502E-12
node -7.686268813276131E-15 1.69235138912706E-14 -9.550448096640752E-12 6.850003495012315E-11 -6.511461165152104E-11 -4.077727744133205E-12
peri 9.633276323340919E-14 -2.117938040304084E-13 2.926113610157565E-10 -6.511461165152104E-11 1.535267075087745E-10 2.67214999523638E-12
i -9.809880066021865E-16 2.388826245699139E-15 -3.333176531459502E-12 -4.077727744133205E-12 2.67214999523638E-12 1.926177100723572E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.6   n/a MPO502226  
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. 2020-October); 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 ]
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