C/2008 FK75 (Lemmon-Siding Spring)


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

2011-10-28 by Bernhard Haeusler, Maidbronn, Germany                                                 frozen on stars and comet

23x 3 min. exposure, 2011-10-28 UT 19:25, 12" SCT  f-5.65 + CCD ST10XME
17.02 mag, coma: 23", tail: 15" in PA177     

Click on the image above to compare the star field with the POSS II  - center coordinates:  22h 26m 20s  +43d 49m 00s J2000
Or here you find the corresponding POSS II image

C/2008 FK75 (Lemmon-Siding Spring)  by Bernhard Haeusler, Germany POSS II: The red cross shows the position of the comet

and here a large region of 1 x 1 showing more of the huge nebula structure.

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

2011-10-28 by Bernhard Haeusler, Maidbronn, Germany                                                                        frozen on comet

23x 3 min. exposure, 2011-10-28 UT 19:25, 12" SCT  f-5.65 + CCD ST10XME
17.02 mag, coma: 23", tail: 15" in PA177     


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 C2011 10 28.85302 22 26 22.32 +43 49 02.0 17.0 N B82
CK08F75K C2011 10 28.86459 22 26 22.34 +43 48 54.3 17.0 N B82
CK08F75K C2011 10 28.87621 22 26 22.46 +43 48 46.5 17.0 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
------------      ----------      --------     -----  -----  -----  -----  -----  -----  ----  ----  ---

C/2008 FK75  28/10/2011  20:45:02 17.02  16.49  16.30   16.24   16.27  16.31      9.5   19.1  B82
C/2008 FK75  28/10/2011  20:45:02* 0.01    0.01    0.03     0.05     0.06    0.05    3       4.2     CMC

FoCAs II - 08/10/2011

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