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111P/Helin-Roman-Crockett
Classification: Encke-type Comet          SPK-ID: 1000118
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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 2-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 has stopped working because of a recent Java upgrade, here is a possible workaround.
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 2456320.5 (2013-Jan-28.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1096207704078609 5.5397e-07  
a 4.160365902658368 7.3931e-07 AU
q 3.704303387230362 2.0858e-06 AU
i 4.228807042165645 4.2346e-05 deg
node 89.79399820609125 0.00043835 deg
peri 3.37794152502789 0.00045992 deg
M 359.6946225231546 0.00017503 deg
tp 2456323.129239941113
(2013-Jan-30.62923994)
0.0015075 JED
period 3099.529109280249
8.49
0.00082619
2.262e-06
d
yr
n .1161466749649584 3.0959e-08 deg/d
Q 4.616428418086374 8.2035e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -1.134125358309937E-7 5.669E-9
  Orbit Determination Parameters
   # obs. used (total)      137  
   data-arc span      8753 days (23.96 yr)  
   first obs. used      1989-01-03  
   last obs. used      2012-12-21  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      1  
   fit RMS      .79086  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2013-Jan-28 09:17:54  

Additional Information
 Earth MOID = 2.72099 AU 
 T_jup = 3.023 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.5 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 10.0   n/a ICQ 2005 Handbook  
diameter diameter 1.2 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

111P/Helin-Roman-Crockett          Discovered 1989-Jan-02 by Helin, Eleanor at Palomar Mountain Observatory (675)
discovered on plate/photo taken on discovery date as well as 1/3,5
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1987.6   111P/1989 A2   1988 XIII   1989b 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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