255P/Levy
� 2012-01-15 by Bernhard Haeusler, Maidbronn, Germany frozen on comet
180 x 20 sec. exposure,
2012-01-15 UT 19:04, 12" SCT
f-5.65 + CCD ST10XME
17.26 mag, coma: 1', tail: 2' in PA59
MPC observation computed with Astrometrica:
COD B82
OBS Bernhard Haeusler
TEL 0.30-m Schmidt-Cassegrain + CCD
NET CMC-14
0255P KC2012 01 15.80112 01 26 36.35 +08 07 49.8 17.9
N B82
0255P KC2012 01 15.81430 01 26 41.76 +08 07 01.4 17.4
N B82
0255P KC2012 01 15.85409 01 26 57.75 +08 04 31.9 17.9
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
------------ ---------- --------
----- ----- ----- ----- ----- -----
---- ---- ---
P/2011 Y1 15/01/2012 20:08:23
17.26 16.62 16.22 15.94 15.86 15.78 3.3 18.8 B82
P/2011 Y1 15/01/2012 20:08:23* 0.07
0.13 0.06 0.12 0.18 0.22 3 4.3 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