77P/Longmore


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77P/Longmore � by Bernhard H�usler, Germany

2009-03-25 by Bernhard Haeusler, Maidbronn, Germany,      image frozen on comet and stars         

5 x 5 min. exposure, 2009-03-25, UT 01:10 to 01:35, 12" SCT  f-7 + CCD ST10XME
14.96 mag, coma: 0'18", tail: 2'33" in PA 305�


MPC observation: computed with Astrometrica

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

NET CMC-14

0077P C2009 03 25.05053 12 05 26.06 +11 53 40.5 15.0 N B82
0077P C2009 03 25.05765 12 05 25.53 +11 53 37.7 14.9 N B82
0077P C2009 03 25.06478 12 05 25.04 +11 53 35.2 15.0 N B82

Gauss curve produced by Astrometrica. The total PSF is using the aperture circle of 10 x 10 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
------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---

77P               25/03/2009 01:23:01 14.96 14.33 14.06 13.90 13.79 13.72 33.0 19.1 B82
77P               25/03/2009 01:23:01* 0.01 0.01 0.02 0.02 0.02 0.03 5 4.8 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.

The comet is moving towards its Perihel  in July 2009 in a Sun distance of 2.31 AU.
In March 2009 the distance to the Sun is around 2.42 AU


 

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