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Table 1

Observing conditions and ephemeris errors.

Comet UT date rh Δ Phase O − Cu1 Cf − Cu1
[yyyy/mm/dd.d] [AU] [AU] [°] δRA δDec δRA δDec

C/2002 X5 2003/01/13.6 0.553 1.032 69.3 +1.6″ –2.2″
2003/01/26.5 0.214 1.172 26.1 1.5″ –11″ +0.9″ –10.3″
2003/03/12.7 1.184 1.096 50.5 +3.0″ +0.9″
C/2002 V1 2003/02/16.6 0.135 0.978 90.3 –1.9″ –3.5″ –3.9″ –6.6″
2003/02/17.6 0.107 0.986 87.7 –1.5″ –4.5″ –2.5″ –8.8″
C/2006 P1 2007/01/15.6 0.207 0.817 140.0 +1″ +30″ –1.2″ +27.1″
2007/01/16.6 0.229 0.822 129.3 +1″ +28″ +0.6″ +25.7″
2007/01/17.6 0.256 0.833 119.1 +0″ +23″ +2.0″ +23.5″

Notes. 

(1)

O, Cu, and Cf denote the position of the HCN peak emission determined from mapping, the used computed ephemeris, and the final (reference) ephemeris, respectively. Orbital elements are given for C/2002 X5 (MPEC 2003-A41, 2003-A84, and 2003-D20 used, JPL#402 reference), C/2002 V1 (MPEC 2003-C42 used, JPL#34 reference), C/2006 P1 (JPL#15, JPL#25 reference). The uncertainty in reference orbit is 2″.

(2)

JPL HORIZONS ephemerides: http://ssd.jpl.nasa.gov/?ephemerides

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