C/2008 P1 (Garradd)


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[c2008p1_20090913_large]

C/2008 P1 (Garradd)  by Bernhard Haeusler, Germany

2009-09-13 by Bernhard Haeusler, Maidbronn, Germany             full size image                                   frozen on comet and stars

60 x 2 min. exposure, 2009-09-13 UT 01:27 to 03:35, 12" SCT  f-6.532 + CCD ST10XME
16.78mag, coma: 11", tail: 8'21" in PA 186


C/2008 P1 (Garradd)  by Bernhard Haeusler, Germany

2009-09-13 by Bernhard Haeusler, Maidbronn, Germany             full size image                                                  frozen on comet

60 x 2 min. exposure, 2009-09-13 UT 01:27 to 03:35, 12" SCT  f-6.532 + CCD ST10XME
16.78mag, coma: 11", tail: 8'21" in PA 186


MPC observation: computed with Astrometrica

COD B82
OBS Bernhard Haeusler
TEL 0.30-m Schmidt-Cassegrain + CCD

NET USNO-A2.0

CK08P010 C2009 09 13.06731 00 06 25.73 +28 01 44.7 16.8 N B82
CK08P010 C2009 09 13.09687 00 06 23.47 +28 01 59.7 16.8 N B82
CK08P010 C2009 09 13.14119 00 06 20.10 +28 02 22.3 16.8 N B82


 

Gauss curve produced by Astrometrica. The total PSF is using the aperture circle of 5 x 5 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
------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---

C/2008 P1    13/09/2009 02:30:07 16.78 16.34 16.15 16.06 16.01 15.97 10.4 19.3 B82
C/2008 P1    13/09/2009 02:30:07* 0.08 0.12 0.14 0.11 0.11 0.14 6 4.8 USN

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

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