19P/Borrelly
The central condensation seems to have a double structure this
day.
May be this is a special bright dust emission in PA 310� in 8 arc seconds
distance of the central condensation.
Grubbing in my old images I found some interesting pictures and
animations of comet C/1999 S4 (LINEAR):
"The Beauty and the Death of a comet"
� 2009-05-07 by Bernhard Haeusler, Maidbronn, Germany
42 x 3 min. exposure,
2009-05-07, UT 21:56 to
00:19, 12" SCT
f-6.532 + CCD ST10XME
17.66 mag, coma: 0'16", tail: 3'19" in PA 296�
Line profile with
Astroart 4 of the
central part of the comet.
Comparison of the line profiles of the images
of this year
The inlay image is turned -50� and enlarged 4x. Image processing: logarithmic
a = central condensation
b = peak point of the tail in PA 310� in 8 arc seconds
distance of the central condensation.
Line profile with MaxIm
DL of the
central part of the comet.
a = central condensation
b = peak point of the tail in PA 310� in 8 arc seconds
distance of the central condensation.
MPC observation: computed with Astrometrica
COD B82
OBS Bernhard Haeusler
TEL 0.30-m Schmidt-Cassegrain + CCD
NET CMC-14
0019P C2009 05 07.92603 12 32 23.96 +35 57 41.4 17.7 N B82
0019P C2009 05 07.93895 12 32 23.67 +35 57 32.6 17.7 N B82
0019P C2009 05 08.00361 12 32 22.19 +35 56 48.8 17.9 N B82
Gauss curve produced by Astrometrica. The total PSF is using the
aperture circle of 5 x 5 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
------------ ---------- -------- ----- ----- ----- ----- ----- -----
---- ---- ---
19P
07/05/2009 23:16:03 17.66 16.74 16.17 15.84 15.58 15.44 3.7 17.6
B82
19P
07/05/2009 23:16:03* 0.15 0.14 0.15 0.19 0.19 0.17 6 4.2 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