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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 ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2454980.5 (2009-May-29.0) TDB
Reference: JPL 251 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6949264023325195 6.4924e-09  
a 3.469764682529919 3.7618e-08 AU
q 1.058533594758966 2.32e-08 AU
i 13.61715960790553 2.194e-06 deg
node 219.7738694367208 6.6677e-06 deg
peri 181.2178536214435 6.4912e-06 deg
M 281.105428824461 1.1885e-06 deg
tp 2455497.860275640459
(2010-Oct-28.36027564)
5.9297e-06 JED
period 2360.741638561709
6.46
3.8391e-05
1.051e-07
d
yr
n .15249445094692 2.4799e-09 deg/d
Q 5.880995770300872 6.376e-08 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
AJ1 [EST] 2.477513858655444E-9 4.764E-11
AJ2 [EST] 4.256439146454415E-9 4.17E-11
ALF [SET] 93.05206777907777 n/a
DEL [SET] -1.38277922386182 n/a
ET1 [SET] 30. n/a
ET2 [SET] 135. n/a
  Orbit Determination Parameters
   # obs. used (total)      6506  
   data-arc span      9922 days (27.16 yr)  
   first obs. used      1986-03-15  
   last obs. used      2013-05-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .68296  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-13 19:41:44  

Additional Information
 Earth MOID = .0656851 AU 
 T_jup = 2.641 
[ 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 13.2 mag 1. 251 from 680 observations, assumed slope, autocmod 2.5c
comet total magnitude slope K1 16.   n/a 251 autocmod 2.5c
comet nuclear magnitude M2 16.9 mag 1. 251 from 4749 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 251 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 251 autocmod 2.5c
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
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1991.4   103P/1991 N1   1991 XV   1991t 
 1985.0   103P/1986 E2   1985 V   1986c 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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