C/2008 FK75 (Lemmon-Siding Spring)


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C/2008 FK75 (Lemmon-Siding Spring)  by Bernhard Haeusler, Germany

2010-07-30 by Bernhard Haeusler, Maidbronn, Germany                                                 frozen on stars and comet

12 x 10 min. exposure, 2010-07-30 UT 21:28, 12" SCT  f-5.65 + CCD ST10XME
16.23 mag, coma: 23", tail: 2' in PA220     


MPC observation computed with Astrometrica: MPC 2009-Y59 and MPC 2009-Y60

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

NET CMC-14

CK08F75K C2010 07 30.90545 17 26 28.49 +41 53 36.3 16.2 N B82
CK08F75K C2010 07 30.91255 17 26 28.39 +41 53 35.0 16.2 N B82
CK08F75K C2010 07 30.92669 17 26 28.20 +41 53 32.6 16.2 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 FK75 30/07/2010 21:59:08 16.23 15.56 15.31 15.19 15.15 15.17 19.9 18.6 B82
C/2008 FK75 30/07/2010 21:59:08* 0.01 0.01 0.02 0.02 0.03 0.08 6 4.4 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.

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 of all sites and images of this web: Bernhard Haeusler, Dettelbach, Germany   IAU code: B82 Maidbronn and K87 Dettelbach Vineyard Observatory