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26P/Grigg-Skjellerup
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000034
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


:
Orbital Elements at Epoch 2454326.5 (2007-Aug-14.0) TDB
Reference: JPL K1810/3 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6330527671345312 5.5993e-08  
a 3.043315833693677 4.8306e-08 au
q 1.116736323909562 1.7588e-07 au
i 22.35649066304651 1.0161e-05 deg
node 211.710319637668 2.9596e-05 deg
peri 1.704070781269587 2.5765e-05 deg
M 318.6607259499996 4.4847e-06 deg
tp 2454549.179024563690
(2008-Mar-23.67902456)
2.4166e-05 TDB
period 1939.183758910921
5.31
4.617e-05
1.264e-07
d
yr
n .185645119161983 4.4201e-09 deg/d
Q 4.969895343477792 7.8886e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.607514810981455E-10 1.934E-11
A2 [EST] -1.042381945690657E-11 2.227E-13
  Orbit Determination Parameters
   # obs. used (total)      635  
   data-arc span      19278 days (52.78 yr)  
   first obs. used      1966-12-19  
   last obs. used      2019-09-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .74833  
   source      ORB  
   producer      Javier Roa  
   solution date      2019-Oct-10 09:54:25  

Additional Information
 Earth MOID = .110412 au 
 Jupiter MOID = .00221554 au 
 T_jup = 2.805 
[ 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
comet total magnitude M1 15.1   1. K1810/3 from 130 observations, assumed slope, autocmod 2.8
comet total magnitude slope K1 14.   n/a K1810/3 autocmod 2.8
comet nuclear magnitude M2 18.1   01. K1810/3 from 280 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K1810/3 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K1810/3 autocmod 2.8
diameter diameter 2.6 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

26P/Grigg-Skjellerup          Discovered 1902-Jul-23 by Grigg, John at Thames, New Zealand
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1992.3       1992 XVIII   
 1987.0       1987 X   1986m 
 1981.7       1982 IV   1982a 
 1976.4       1977 VI   1977b 
 1971.1       1972 II   1972b 
 1965.8       1967 I   1966f 
 1960.4       1961 IX   1961g 
 1955.1       1957 I   1956i 
 1949.8       1952 IV   1952b 
 1944.5       1942 V   1947a 
 1939.2       1937 III   1937e 
 1933.9       1932 II   1932d 
 1928.6   26P/1927 F1   1927 V   1927e 
 1923.3   26P/1922 K1   1922 I   1922b 
 1902.0   26P/1902 O1   1902 II   1902c 
 1806.5   26P/1808 C1   1808 III   
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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