above image croped and downscaled,
north is up, east to the left,
click on image
for larger picture: (crop, downscaled),
full scale image (croped,
14.5"/px)
bright star at upper right is Beta PER (Algol),
the open cluster at the bottom is NGC 1342 with 14'
comet diameter measured in this image: 55' x 61',
thin clouds passing through and 25% quarter moon 40 deg down the comet
at a height of 12 deg
2008/02/11
20:55
-
21:28
47 x 30 sec
Sigma 105 mm f/2.8 EX Makro
@ f/4.0
Canon EOS 10D
ISO 800
6.6° x 4.3°
(large images)
DeepSky Stacker:
register,
stack
PS:
crop,
scale,
curves,
save as JPEG
click on picture
for larger image (crop with 50% scale, 7.6"/px), north is up, east
to the left,
the 50% illuminated moon was 60 deg to the lower right
with the naked eye and a 12" f/4.3 dobson at 40x the comet wasn't
visible, only in a pair of 10x50 binoculars a large pale glow could
be glimpsed
2007/12/17
18:20
-
19:07
71 x 30 sec
Vixen 80 mm
f/5 refractor
Canon EOS 10D
ISO 800
101.3' x 101.3'
DeepSky Stacker:
dark,
flat,
register,
stack,
hot pixel removal,
scale to 1/2
PS:
crop,
curves,
gaussian filter,
unsharp mask
click on image for original scale (2.18"/px), north is down, east to the right
2007/12/01
18:28
-
18:52
3 x 10 x 30 sec
C 8 @
f / 5.8
Starlight SX
20.4' x 30.3'
Mira A/P:
dark
flat
Astrometrica:
register on comets motion,
average combine of each set
PS:
open FITS,
pixel rectification,
crop,
curves,
combine images,
save as JPEG
click on image for larger scale (15.2"/px), north is up, east to the left
2007/12/01
17:40
-
18:20
60 x 30 sec
Vixen 80 mm
f/5 refractor
Canon EOS 10D
ISO 400
99.3' x 136.8'
DeepSky Stacker:
dark,
flat,
register,
hot pixel removal,
scale to 1/2
PS:
crop
curves
scale to 1/4
click on image for large image with 7.6"/px, north is up, east to the left
2007/10/31
20:48
-
21:24
35 x 30 sec
Vixen 80 mm
f/5 refractor
Canon EOS 10D
ISO 400
88' x 88'
DeepSky Stacker:
dark
register
hot pixel removal
scale to 1/2
PS:
crop
curves
click on image for larger image, north is up, east to the left
2007/10/30
21:33
117 sec
Vixen 80 mm f/5 refractor
Canon EOS 10D
ISO 400
100' x 97'
crop
scale to 1/3
curves
click on image for larger image with 43.4"/px, north is up, east to the left
2007/10/30
20:45
30 sec
Sigma 105mm F/2.8 EX Makro
@ f/2.8
Canon EOS 10D
ISO 400
7.7° x 7.7°
crop,
scale to 1/3,
curves
The comet was estimated +2.7 mag visually with the unaided eye.
2007/10/30
21:01:55
-
21:26:58
100 x 10 sec
C 8 @
f / 5.8
Starlight SX
17.3' x 11.1'
Mira A/P:
dark,
flat,
register on comet,
sum images as 32 bit real,
change type to 16 bit integer
PS:
open FITS,
pixel rectification,
crop,
curves,
save as JPEG
The outer coma has a diameter of 7.3'.
These 3 images originates from the
same frame. Only the contrast was adjusted in Photoshop. Images with
10 sec exposure time were saturated in the innermost area.
This part of the image is enlarged 2x, pixel scale is 1.09"/px.
2007/10/26
21:20:20
-
21:53:40
250 x 5 sec
C 8 @
f / 5.8
Starlight SX
16.5' x 11.1'
and
1.82' x 1.82'
(enlarged 2x)
Mira A/P:
dark
flat
register on comet
sum images as 32 bir real
pixel rectification
change type to 16 bit integer
PS:
open FITS
crop
curves
save as JPEG
This false color image shows the whole dynamic range in one picture (click on it to see the full extent of the image in 2 x enlargement).
The streak to the right is not an ion tail but stems from smearing of bright sources during readout.
These 3 images originates from the same frame. Only the contrast was adjusted in Photoshop. Images with 10 sec exposure time were saturated in the innermost area.
This part of the image is enlarged 2x, pixel scale is 1.09"/px.
2007/10/26
20:33:36
-
20:46:53
100 x 5 sec
C 8 @
f / 5.8
Starlight SX
16.5' x 11.1'
and
1.82' x 1.82'
(enlarged 2x)
Mira A/P:
dark
flat
register on comet
sum images as 32 bir real
pixel rectification
change type to 16 bit integer
PS:
open FITS
crop
curves
save as JPEG
This image gives the
visual impression at the telescope:
the inner coma about 20" in diameter and an outer shell with about
40" to 60" diameter. The sum of the exposure time was only
12.5 seconds, partly through thin clouds!
The comet was estimated at 2.8 mag visually with the naked eye.
It seems that the inner
coma is not exactly placed in the middle of the outer shell.
North is down and east to the right.
2007/10/24
20:19
50 x 0.25 sec
C 8 @
f / 5.8
Starlight SX
19.7' x 14.9'
Mira A/P:
bias
register on comet
sum images
pixel rectification
At this time the comet was hard to measure because of its proximity to 15.4 mag USNO B1.0 star 1380-0122707, but it's around 17 mag.
This and the above image are at the same scale and orientation, south is up and east to the right.
2007/10/06
-
2007/10/07
23:56:55
-
00:10:22
5 x 180 sec
C 8 @
f / 5.8
Starlight SX
8.0' x 8.0'
Mira A/P:
dark
flat
Astrometrica:
track and stack on comet
PS:
pixel rectification
curves
insert lines