C/2001 Q4 Neat (May 11)

clic for 70% size 1403 x 935 (200 kB)

About this Image

A second view to the comet Neat after dusk with some less transparency but more exposure time;
Again an extended coma with still fainter dust tail and better visible ion tail. This image is a blending of star and comet aligned images.

Below there is a conventional view with a set of 17 L raws centered on the nucleus with the frames streightly averaged. This view provides much more details in the tail.

At bottom a crop of the middle image has been filtered with a Larson-Sekanina filter to show the shock waves ahead of the nucleus.

clic for 100% size 1977 x 1295 (373 kB)


Technical Details


105mm TMB refractor with flattener at f/6.5

Mount MK-100 GEM
Camera SBIG STL-11000M at -20C, internal filter wheel
Filters Astronomik LRGB
Date May 10, 2004 19:55-20:25 UT.
Location Wildon/Austria
Sky Conditions mag 5 sky, good transparency, temperature 10 C
Exposure Top: L:R:G:B= 1:2:2:2 minutes (1-min sub-exposures);
Middle: L = 17 minutes (1-min sub-exposures); all binned 2x2.
Processing Image calibration, aligning on stars, average stacking (top); median stacked image aligned on the nucleus and added to the first one;
average aligned on the nucleus (middle); color synthesis, DDP in ImagesPlus;
color balance, curves in Photoshop; north is up;