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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 ]

[ show orbit diagram ]
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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