Comet 73P Schwassmann-Wachmann

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Archive of Dennis Persyk's Comet 73P Pages

© 2006 Dennis Persyk

Original source (Dennis' web site):

2006 Apr 23 - 73P B Split Nucleus Movie


Animation spanning seven 6-minute frames. During the 42 minute
period 73P-B traversed 1.8 arc minutes. The stars are elongated
because I was guiding on the comet head(s).

2006 Apr 23 - 73P-B Split Nucleus

73P-B Split Nucleus

73P_B_10x6m_mh_2x_anot.jpg Iso_clr_anot_R2.jpg Clr_anot_R2.jpg
  Comet head in gray scale.
  Isophotes -- lines of constant intensity, akin to contour lines on a topographical map. Note the stars that distort the smooth contours.   Color-intensity map.  Each color represents a different intensity.  


Takahashi E160   at f/3.3


10  x 

6minutes, guided with MX-716 on NP-101, binned 1x1; resampled 2x; SXV-H9 camera on loan from Jeff Terry"> .   Acquired with AstroArt 3.0.  Processing 

MaximDL,  ImagesPlus, and Astroart 3.0. 



20.03 mags/sq arc second at zenith ~ Bortle 5 ~ 5.6-5.9 VLM as measured with Quality Meter





This is the first time I was successful in guiding on a comet head.  Usually the comet runs into a star and the autoguider gets lost. I was very fortunate tonight that there were no stars brighter than magnitude 15 in path of fragment B. The fragment has a relative motion  2.5 arc seconds per minute.  I normally would have been able to take only 30 second unguided exposures to avoid blur.

Seperation_anot.JPG Line_prof_R1.jpg
    This extreme magnification

illustrates the center-to-center separation of the two nuclei of 16 arc

  The line profile through

the nuclei illustrates the two distinct peaks.

  Orbit.jpg   SMP_R1.jpg  
  Orbit details from

View from showing comet fragments B, C and G in Bootes. Planetarium programs are notorious for incorrect comet magnitudes.  

Thanks for looking and for feedback.</p>

Email comments appreciated at href="mailto:[email protected]"

© 2006 Dennis Persyk