C/2010 S1 (LINEAR)


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Meanwhile the comet's coma is 10 arc seconds wide, but a tail is still not noticeable.

C/2010 S1 (LINEAR) � by Bernhard Haeusler, Germany

2011-04-02 by Bernhard Haeusler, Maidbronn, Germany                                                    frozen on comet

3 x 10 min. exposure, 2011-04-02 UT 18:58, 12" SCT  f-5.65 + CCD ST10XME
16.12 mag, coma: 10"  


MPC observation: computed with Astrometrica

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

NET USNO-A2.0

CK10S010 C2011 04 02.79425 01 41 05.65 +53 40 23.2 16.1 N B82
CK10S010 C2011 04 02.80137 01 41 05.83 +53 40 23.3 16.1 N B82
CK10S010 C2011 04 02.80848 01 41 05.97 +53 40 23.5 16.1 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    SNR  SB  COD
OBJECT        DATE          TIME         +/-     +/-           N  FWHM  CAT
------------  ----------      --------     -----   -----       -----     ----    ---

C/2010 S1     02/04/2011 19:13:58  16.12  16.07        29.9 18.1 B82
C/2010 S1     02/04/2011 19:13:58*  0.01    0.06          3      4.1 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.

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