C/2007 N3 (Lulin)

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The comet has still a tail of about 15 arc minutes. magnitude: 18.53, Actual distance to the Sun: 5.3 AU, Sun Pos.Ang. 261.4

C/2007 N3 (Lulin) © by Bernhard Häusler, Germany 

© 2010-03-11 by Bernhard Haeusler, Maidbronn, Germany                   

12 x 10 min. exposure, 2010-03-11 UT 18:23, 12" SCT  f-5.65 + CCD ST10XME
18.53 mag, coma: 10", tail: 15'30"  in PA 81.5       

MPC observation: computed with Astrometrica

OBS Bernhard Haeusler
MEA Bernhard Haeusler
TEL 0.30-m Schmidt-Cassegrain + CCD


CK07N030 C2010 03 11.76973 04 27 35.85 +20 09 37.5 18.7 N B82
CK07N030 C2010 03 11.79797 04 27 35.87 +20 09 37.4 18.6 N B82
CK07N030 C2010 03 11.84036 04 27 35.79 +20 09 38.3 18.5 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:

OBS Bernhard Haeusler

                                                      10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB  COD
OBJECT        DATE       TIME       +/-       +/-       +/-       +/-       +/-      +/-  N  FWHM  CAT
------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---
C/2007 N3    11/03/2010 19:23:19 18.53 17.65 17.29 17.16 17.02 16.92 3.7 18.2 B82
C/2007 N3    11/03/2010 19:23:19* 0.11 0.16 0.17 0.27 0.16 0.17 5 4.4 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.

Facas 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.


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