19P/Borrelly
Finally we had a complete clear night at June, 12. The tail is
spreading over 13 arcmin.
The third knot is visible pretty good. See also my
image of May, 7.
� 2009-06-12 by Bernhard Haeusler, Maidbronn, Germany frozen on comet and stars
153 min. exposure, 2009-06-12 UT
20:55 to UT 23:35 12" SCT
f-6.532 + CCD ST10XME
18.12 mag, coma: 0'15", tail: 13'29" in PA 302�
� 2009-06-12 by Bernhard Haeusler, Maidbronn, Germany frozen on comet
153 min. exposure, 2009-06-12 UT
20:55 to UT 23:35 12" SCT
f-6.532 + CCD ST10XME
18.12 mag, coma: 0'15", tail: 13'29" in PA 302�
enlargement 8 x of the image up.
Line profile:
The second peak (Peak a) is lying
in is about 4.2 arcsec distance of the central condensation in PA 315�.
It is interesting, that the third peak (Peak b) is also significantly visible in 8.4 arcsec
distance to the central condensation. See also
2009-05-18
Description of the scale
of the line profile:
X axis: 1 pixel = 1.407 arcsec
See also the complete analysis of 19P/Borrelly. of the last weeks.
MPC observation: computed with Astrometrica
COD B82
OBS Bernhard Haeusler
TEL 0.30-m Schmidt-Cassegrain + CCD
NET CMC-14
0019P C2009 06 12.88140 12 30
01.73 +28 32 29.8 18.1 N B82
0019P C2009 06 12.90535 12 30 02.07 +28 32 12.2 18.3 N B82
0019P C2009 06 12.95983 12 30 02.85 +28 31 28.4 18.0 N B82
Gauss curve produced by Astrometrica. The total PSF is using the
aperture circle of 3 x 3 pixel around the brightest pixel.
You see the Gauss curve right as the computed ideal line and the real pixels
contributed around the ideal line.
The Fit RMS is the deviation from the ideal line (inlay under the Gauss curve).
Photometry computed with FOCAS II, using the Multibox method:
COD B82
OBS Bernhard Haeusler
CATALOG: USNO A2.0 / CMC-14 - BAND: R
10x10 20x20 30x30 40x40 50x50 60x60 SNR SB COD
OBJECT DATE TIME +/-
+/- +/-
+/- +/-
+/- N FWHM CAT
------------ ---------- -------- ----- ----- ----- ----- ----- -----
---- ---- ---
19P
12/06/2009 21:58:21 18.12 17.16 16.62 16.35 16.12 15.92 3.7 18.5
B82
19P
12/06/2009 21:58:21* 0.10 0.04 0.09 0.17 0.17 0.16 3 4.2 CMC
FoCAs II - 07/01/2009-b
FOCAS II is a tool for photometry on the base of data coming from Astrometrica. Focas is basically using the .LOG file of Astrometrica.
Explanation of the FOCAS II table headings:
Object, date and time are self-explaining.
10x10, 20x20 ... 60x60 are the measured magnitudes according to the aperture
sizes of photometry in arc sec (rectancle).
SNR is the
Signal-to-noise ratio for aperture photometry (calculator).
SB is the magnitude of the faintest star on the image matching with the used
star catalogue. This is not the faintest star of the image!
COD is the MPC Code of the
observatory.
second line:
+/- are the precisions of the measurements.
N is the number of the used images for the measurements.
FWHM is the
Full-Width Half-Maximum of the total PSF: Measure of the seeing.
CAT is the used star catalog in Astrometrica.
Focas II is using the .log file of Astrometrica and is computing
the photometry under different apertures (10x10 ... 60x60).
The graphs are showing the astrometric precision of the images.
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