Bernd Brinkmann´s

images of

Comet 17P/Holmes

Aufsuchkarte / FinderChart

date (yy/mm/dd) time (UT) exp. time (min/sec) camera / telescope film / CCD image size processing

17P/Holmes 13.02.2008

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

17P/Holmes 1.12.2007

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

17P/Holmes 1.12.2007

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

17P/Holmes 30.10.2007

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

17P/Holmes 30.10.2007

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'

PS:
crop
scale to 1/3
curves

17P/Holmes 30.10.2007

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°

PS:
crop,
scale to 1/3,
curves

17 P/Holmes 30.10.2007

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

17 P/Holmes 26.10.2007

The outer coma has a diameter of 7.3'.


17 P/Holmes 26.10.2007

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.

17 P/Holmes 26.10.2007

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

17 P/Holmes 26.10.2007, false color

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).

17 P/Holmes 26.10.2007

The streak to the right is not an ion tail but stems from smearing of bright sources during readout.

17 P/Holmes 26.10.2007

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.

17 P/Holmes 26.10.2007

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

17 P/Holmes 24.10.2007

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

17 P/Holmes 06.10.2007

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

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any comments to: Bernd.Brinkmann@FH-BOCHUM.DE
last update: 13.02.2008