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103P/Hartley 2
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000041
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 2455456.5 (2010-Sep-17.0) TDB
Reference: JPL 183 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6951452964967095 1.3729e-06  
a 3.472769398388862 1.4784e-05 AU
q 1.058690085281137 3.5518e-07 AU
i 13.61716956119923 2.3585e-05 deg
node 219.7626609177958 5.3186e-05 deg
peri 181.1954811299036 0.00011319 deg
M 353.7167049330382 3.6019e-05 deg
tp 2455497.756967202996
3.8839e-05 JED
period 2363.808803309979
n .1522965814730453 9.7251e-07 deg/d
Q 5.886848711496587 2.5061e-05 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 7.225261187420759E-10 8.666E-10
A2 [EST] -1.525011674392043E-9 3.204E-10
A3 [EST] -3.798639416296654E-10 4.441E-10
  Orbit Determination Parameters
   # obs. used (total)      2638  
   # delay obs. used      1  
   # Doppler obs. used      1  
   data-arc span      84 days  
   first obs. used      2010-08-01  
   last obs. used      2010-10-24  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      2  
   fit RMS      .37548  
   data source      ORB  
   producer      Steven R. Chesley  
   solution date      2010-Oct-24 11:48:36  

Additional Information
 Earth MOID = .0668221 AU 
 T_jup = 2.640 
[ 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 14.6 mag 1. 183 from 277 observations, assumed slope, autocmod 2.4a
comet total magnitude slope K1 17.   n/a 183 autocmod 2.4a
comet nuclear magnitude M2 17.7 mag 0.7 183 from 1984 observations, autocmod 2.4a
comet nuclear magnitude slope K2 5.   n/a 183 autocmod 2.4a
comet nuclear phase coefficient PC 0.03   n/a 183 autocmod 2.4a
diameter diameter 1.6 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  
rotation period rot_per 18.1 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Harmon, J.K.; Nolan, M.C; Howell, E.S.; Giorgini, J.D. (2010) CBET 2515.]
[Belton, M.J.S.; Thomas, P.; Lie, J.-Y.; Williams, J.; et al. (2012) Icarus, in press.]

103P/Hartley 2          Discovered 1986-Mar-15 by Hartley, Malcolm at U. K. Schmidt Telescope Unit, Siding Spring
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1991.4   103P/1991 N1   1991 XV   1991t 
 1984.9   103P/1986 E2   1985 V   1986c 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2014-Apr-23 07:33 UT
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