30p_20100304

30P/Reinmuth and 31P/Schwassmann-Wachmann

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30P/Reinmuth has a meeting with 31P/Schwassmann-Wachmann this night

30P/Reinmuth) � by Bernhard Haeusler, Germany

� 2010-03-04 by Bernhard Haeusler, Maidbronn, Germany frozen on comets and stars

53 x 2 min. exposure, 2010-03-04 UT 19:08, 12" SCT f-5.65 + CCD ST10XME
30P: 16.12 mag, coma: 24", tail: 1'20" in PA 88�
31P: 18.50 mag, coma: 8", tail: 7" in PA 231�

MPC observation: computed with Astrometrica

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

NET CMC-14

0030P C2010 03 03.84527 05 21 05.90 +21 39 37.0 16.1 N B82
0030P C2010 03 03.84822 05 21 06.09 +21 39 37.5 16.1 N B82
0030P C2010 03 03.84970 05 21 06.25 +21 39 38.8 16.1 N B82
0030P C2010 03 04.80234 05 22 30.59 +21 45 57.4 16.1 N B82
0030P C2010 03 04.80976 05 22 31.21 +21 46 00.4 16.1 N B82
0030P C2010 03 04.86767 05 22 36.27 +21 46 23.0 16.2 N B82
0030P C2010 03 04.87065 05 22 36.56 +21 46 23.9 16.1 N B82
0031P C2010 03 04.84091 05 22 10.43 +21 43 50.7 18.9 N B82
0031P C2010 03 04.85579 05 22 10.92 +21 43 51.3 18.8 N B82
0031P C2010 03 04.87065 05 22 11.37 +21 43 51.3 18.3 N B82

Gauss curve produced by Astrometrica. The total PSF is using the aperture circle of 6 x 6 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
------------ ----------      --------    ----- ----- ----- ----- ----- ----- ---- ---- ---

30P               03/03/2010 20:20:22 16.05 15.41 14.85 14.54 14.36 14.22 4.8 17.1 B82
30P               03/03/2010 20:20:22* 0.09 0.12 0.10 0.15 0.24 0.27 4 4.8 CMC
30P               04/03/2010 20:07:24 16.12 15.42 15.09 14.88 14.71 14.58 9.9 18.6 B82
30P               04/03/2010 20:07:24* 0.03 0.02 0.03 0.03 0.05 0.06 6 4.5 CMC
31P                04/03/2010 20:17:48 18.50 18.17 17.92 17.99 17.81 3.3 18.7 B82
31P                04/03/2010 20:17:48* 0.26 0.40 0.22 0.32 0.36 5 4.5 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

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