19P/Borrelly
On May, 18 2009 I could finally take more images of the comet.
here is my image of last night:
� 2009-05-18 by Bernhard Haeusler, Maidbronn, Germany .gif animation 3.919 KB
80 x 3 min. exposure (240 min. total), 2008-05-18 UT 21:11 to UT 01:22 12" SCT
f-6.532 + CCD ST10XME
18.04 mag, coma: 0'09", tail: 6'23" in PA 297�
enlargement 8 x of the image up.
The night was almost perfect
with pretty good seeing and clear view.
Average FWHM: 4.0, weakest star on a 3 minute exposure: 19.4 mag
10 x 10 Box magnitudes measured
with FOCAS II:
19P: 18.04 (at May, 07: 17.66), Knot a: 18.30,
Knot b: 18.57
The 10 x 10 box method for
photometry is not giving the exact magnitude of a and b condensation.
Knot a seemed to change its magnitude during the four hours session.
Knot b was more constant. Maybe they are not real.
Giovanni Sostero
and his collegues are observing the larger spot close to the central
condensation, both marked with the two red blinking circles.
Unfortunately this spot is too weak for performing any astrometry.
Line profile:
MPC observation: computed with Astrometrica
COD B82
OBS Bernhard Haeusler
TEL 0.30-m Schmidt-Cassegrain + CCD
NET CMC-14
0019P C2009 05 18.90568
12 28 35.82 +33 49 51.1 17.9 N B82
0019P C2009 05 18.94266 12 28 35.35 +33 49 23.4 17.9 N B82
0019P C2009 05 18.94484 12 28 35.35 +33 49 22.5 17.9 N B82
0019P C2009 05 18.96008 12 28 35.17 +33 49 10.5 18.0 N B82
0019P C2009 05 18.97532 12 28 34.94 +33 48 59.0 18.0 N B82
0019P C2009 05 19.02324 12 28 34.30 +33 48 23.8 18.1 N B82
0019P C2009 05 19.04284 12 28 34.06 +33 48 09.1 18.2 N B82
0019P a C2009 05 18.94266 12 28 34.96 +33 49 27.3 18.1 N B82
0019P a C2009 05 18.94484 12 28 34.93 +33 49 26.8 18.2 N B82
0019P a C2009 05 19.04936 12 28 33.57 +33 48 12.8 18.6 N B82
0019P b C2009 05 18.94266 12 28 34.25 +33 49 28.6 18.6 N B82
0019P b C2009 05 18.94484 12 28 34.21 +33 49 27.7 18.6 N B82
0019P b C2009 05 19.04936 12 28 32.75 +33 48
14.3 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).
The total PSF of the fragments is using the aperture circle of 3 x 3 pixel around the brightest pixel.
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
------------ ---------- -------- ----- ----- ----- ----- ----- -----
---- ---- ---
19P
18/05/2009 23:43:59 18.04 16.90 16.27 15.88 15.60 15.40 4.0 19.4 B82
19P
18/05/2009 23:43:59* 0.09 0.10 0.10 0.10 0.10 0.14 18 4.0 CMC
19P
18/05/2009 23:29:41 18.30 17.00 16.36 15.98 15.73 15.57 3.4 19.5
B82
19P
18/05/2009 23:29:41* 0.19 0.13 0.06 0.04 0.06 0.08 3 3.8 CMC
19P
18/05/2009 23:29:41 18.57 2.1 19.5 B82
19P
18/05/2009 23:29:41* 0.04 3 3.8 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.
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