19P/Borrelly


[upwards] [19p_analysis] [19p_20090616] [19p_20090612] [19p_20090607] [19p_20090524_analysis] [19p_20090524] [19p_20090520] [19p_20090518] [19p_20090507] [19p_20090425] [19p_20090423] [19p_20090412] [19p_20090403] [19p_20090402] [19p_20090401] [19p_20090325] [19p_20090320] [19p_20090318] [19p_20090218]

The analysis of the second condensation/knot of 19P/Borrelly:

19P/Borrelly � by Bernhard Haeusler, Germany; Gustavo Muler, Spain; Esteban Raina Lorenz, Spain; Josep Bosch, Spain, Francois Kugel, France

19P/Borrelly � by Bernhard Haeusler, Germany; Gustavo Muler, Spain; Esteban Raina Lorenz, Spain; Josep Bosch, Spain; Franois Kugel, France,
Albert Sanchez, Spain         


After checking the .fits image of Gustavo Muler, Esteban Raina Lorenz,  Josep Bosch,  Franois Kugel, Albert Sanchez and my own images, I come to the following interim conclusion:

Above  you find the history of our observations. BH means Bernhard Haeusler, GM means Gustavo Muler, EL means Esteban Raina Lorenz,
JB means Josep Bosch and FK means Franois Kugel.

The red marking lines are showing the second condensation, the Italian colleagues around Giovanni Sostero and also Fran�ois Kugel from France reported.
See IAUC 9044 (2009-05-18).

I can follow back this second condensation until April, 2 for sure on my images.
My "detection" at May, 7 is marked with yellow lines. This "knot" is not visible on other images and probably a temporary bulge in the tail..
Pay attention, that the comet decreased its magnitude since March from 17mag to 18mag. This has a visible effect on the images. The inlay images are enlarged with factor 8.

The colored lines (except red and yellow) represent around 5.6 arcseconds corresponding to the focal length of each observer's telescope and the used ccd camera
and binning, to make sure, that we are talking about the same thing.
The knot is not visible on each image since April, 2, but on the most. Also the quality of the seeing and small guiding errors are influencing the significance of the images.

It is interesting, that the knot is obviously not changing its position corresponding to the false nucleus since April, 2. The knot is embedded in the sunward tail of
19P/Borrelly
. The sunward tail has a direction of about 297�  and didn't change significantly its direction this year.

We can clearly observe a feature in the sunward tail in about 5 arcsec distance of the false nucleus in position angle ~302�.
The morphology of the coma and tail of comet 19P/Borrelly was studied after the flyby of the probe Deep Space 1 in September 2001.
The scientists found on the probe's images a complex structure of two jets and two fans, but no evidence of any fragment in the close area of the nucleus.

We can assume now, that the comet is currently sending jets from the opposing pole in roughly direction to the Sun.

Many thanks to all observers for sending me their .fits images! This was very helpful for the analyses.

Good luck for the next observations!

Final conclusion after the hints of Dr. Nalin Samarasinha of the PSI Planetary Science Institute


  links:

http://astrosurf.com/cometas-obs/index_i.htm Visual and CCD Observations and images from the "Cometas Obs" mailing list, using the Focas II format

es.groups.yahoo.com/group/Cometas_Obs The Spanish comet observation group in Yahoo

 

[upwards] [19p_analysis] [19p_20090616] [19p_20090612] [19p_20090607] [19p_20090524_analysis] [19p_20090524] [19p_20090520] [19p_20090518] [19p_20090507] [19p_20090425] [19p_20090423] [19p_20090412] [19p_20090403] [19p_20090402] [19p_20090401] [19p_20090325] [19p_20090320] [19p_20090318] [19p_20090218]

 

Copyright: The author of NEO Planner and all sites of this web is Bernhard Haeusler, Dettelbach, Germany, all rights reserved