Comets

Comet Tsuchinshan-ATLAS (C/2023 A3) during twilight of October 23, 24, 25 and 27, 2024.

Equipment: FTF2020M CCD with IR-blocking filter on 25cm f/D=5.7 Newton (f=1455mm). Sum of 9 exposures of 60 seconds. Click on the left image for an overview of the four photographs covering a field of view of 0.76x0.70 degrees each. The images are processed with an unsharp mask using a rotational uniform filter over 16 degrees centered on the comet's head. Details in the comet's tail are enhanced by a factor of 3.

Click on the right image for a gif showing, in a loop, the unprocessed and sharpened images, albeit with limited greyscale depth! (Click here for a 'mouse-over' version of the unsharp masked and non sharpened (but still processed!) images.)

Comet Tsuchinshan-ATLAS 23-27 october 2024, unsharp masked

TSUCHINSHAN-ATLAS (C/2023 A3)
October 23, 24, 25 & 27, 2024
Scope: 25cm Newton f/D=5.7
CCD: FTF2020-M
Filter: Melles Griot IR-blocking
Exposure: 9x60 seconds
FoV each: 0.76x0.70 degrees

Comet Tsuchinshan-ATLAS 23-27 october 2024

COMET LULIN
March 2, 2009

25cm Newton f/D=5.7
FTF2020-M CCD with RGB filter wheel
Lum.: 1x60 sec; RGB: 4x60sec
FoV: 0.9x0.9 degr

COMET 8P/TUTTLE NEAR M33
December 30, 2007

f=300mm Telelens @ F#4
FTF2020-M CCD with RGB filter wheel
RGB: 4x120sec; L: 4x120sec
FoV: cropped to 2.4x1.9 degr

COMET 17P/HOLMES

Equipment: 25cm Newton f/D=5.7; FTF2020-M CCD; RGB-filterwheel

Mouse-over: Sharpened with a Larson-Sekanina filter

Stitched images of 30 oct.
3, 7 11 and 15 nov. 2007
FoV: 3.8x0.8 degr.


17P/HOLMES 11 nov. 2007 25cm Newton f/D=5.7 FTF2020-M CCD RGB-filterwheel RGB: 20x30sec; L: 7x30sec FoV: 0.55x0.55 degr Mouse-over: LS-filtered	17P/HOLMES 7 nov. 2007 25cm Newton f/D=5.7 FTF2020-M CCD RGB-filterwheel Exposure RGB: 20x30sec FoV: 0.55x0.55 degr Mouse-over: LS-filtered	17P/HOLMES 3 nov. 2007 25cm Newton f/D=5.7 FTF2020-M CCD RGB-filterwheel Exposure RGB: 10x30sec FoV: 0.55x0.55 degr Mouse-over: LS-filtered	17P/HOLMES 30 oct. 2007 25cm Newton f/D=5.7 FTF2020-M CCD RGB-filterwheel Exposure RGB: 8x10sec FoV: 0.55x0.55 degr Mouse-over: LS-filtered

Comet Schwassmann-Wachmann
Fragments C and B, 11 may 2006
25cm Newton, f/D=5.7 with FTF2020-M CCD
Exposure time: 90 seconds
Field of View: 0.96x0.96 degr.

	MACHOLZ near the PLEIADES 7 january 2005 f=300mm tele-objective, F# 5.5 FTF2020-M CCD Exposure: 7x15 seconds		MACHOLZ near the PLEIADES 8 january 2005 f=300mm tele-objective, F# 5.5 FTF2020-M CCD Exposure: 17x12 seconds
	COMET NEAT C/2001 Q4 near Beehive (M44), 15 may 2004 300mm tele-objective, f/D=5.5 FTF2020-M, MYC-filters Each color 4x100sec M,Y,C combined to b/w-image		Macholz with jets 4 february 2005 f=4300mm Cassegrain, f/D=16.8 FTT1010-M CCD; 14x30 seconds Larson-Sekanina filter Alfa=15gr Field of view: 0.13x0.1 graad

Comet Ikeya-Zhang with FTT1010-M CCD
(Short exposures to avoid over-exposure by twilight)
(All images are processed with an unsharp masking technique)

10 March 2002
f=200mm Telelens
27x15sec 22 March 2002
f=300mm Telelens
22x15sec f=950mm Newton
70x10sec 24 March 2002
Barlow projection
f=3300mm
60x5sec

Near earth astroid 1998 WT24, near NGC891
Date: 16 December 2001, 21:00 till 22:10 UT
FTT1010-M with F=300mm telelens, Diaphragm: 5.5
Exposure time: 11 exposures of 1 min.; 7 min. separation between images
Processing: Background removed


	10 March 2002 f=200mm Telelens 27x15sec		22 March 2002 f=300mm Telelens 22x15sec		f=950mm Newton 70x10sec		24 March 2002 Barlow projection f=3300mm 60x5sec