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Comet Holmes



 
 
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  #1  
Old November 2nd 07, 02:48 PM posted to rec.photo.digital.slr-systems
Roger N. Clark (change username to rnclark)
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Posts: 1,818
Default Comet Holmes

There is a very bright comet that is easy to photograph.
The comet 17/P Holmes is in the constellation Perseus and
underwent a 17-million fold increase in brightness in
mid October. It can be viewed in most cities where it
appears about half the diameter of the moon, and from a
dark country sky the fainter outer portion is larger than
the full moon. It is a nice view in binoculars, but the
tail is very faint.

Exposures up to 2 seconds at f/4 ISO 1600 are about the
maximum to prevent overexposure.

Example image: 36 1-second exposures added:
http://www.clarkvision.com/galleries...s2.d-c800.html

To view the comet, google comet Holmes position and you should
get several charts to use for locating the comet. It appears
in the northeastern sky in the evening.

Roger
  #2  
Old November 2nd 07, 03:22 PM posted to rec.photo.digital.slr-systems
RichA
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Posts: 2,544
Default Comet Holmes

On Nov 2, 9:48 am, "Roger N. Clark (change username to rnclark)"
wrote:
There is a very bright comet that is easy to photograph.
The comet 17/P Holmes is in the constellation Perseus and
underwent a 17-million fold increase in brightness in
mid October. It can be viewed in most cities where it
appears about half the diameter of the moon, and from a
dark country sky the fainter outer portion is larger than
the full moon. It is a nice view in binoculars, but the
tail is very faint.

Exposures up to 2 seconds at f/4 ISO 1600 are about the
maximum to prevent overexposure.

Example image: 36 1-second exposures added:http://www.clarkvision.com/galleries...-1/web/comet.h...

To view the comet, google comet Holmes position and you should
get several charts to use for locating the comet. It appears
in the northeastern sky in the evening.

Roger


It's amazing! This thing went from mag 17 to 2 in a couple days!
Even unguided shot duration shots show it with ease. There has been
some structure derived by some shooters, but I don't know if some of
that are products of post-processing.

http://www.pbase.com/andersonrm/image/88269923

  #3  
Old November 3rd 07, 05:30 AM posted to rec.photo.digital.slr-systems
Moonstarer
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Posts: 18
Default Comet Holmes

This is a very rare comet in that it is out in the asteroid belt yet
it is easily visible. The size of it at that distance, being half the
size of the full moon, means at that distance it must be quite huge
indeed. It's believed that it struck an asteroid which caused dust to
fly off of it's surface making it so large. The details you see in
almost every photograph show a coma offset from center. It's really
easy to photograph as the previous posters mentioned...get out and
try!
http://moonstarer1960.spaces.live.co...CDE2C7DB6!243/
Click on "full view" on the right side of the page, it will fill the
screen. Canon 40DH using 135mm f2 lens for 2 second exposure at ISO
3200.
Mike









On Fri, 02 Nov 2007 07:22:31 -0700, RichA
wrote:

On Nov 2, 9:48 am, "Roger N. Clark (change username to rnclark)"
wrote:
There is a very bright comet that is easy to photograph.
The comet 17/P Holmes is in the constellation Perseus and
underwent a 17-million fold increase in brightness in
mid October. It can be viewed in most cities where it
appears about half the diameter of the moon, and from a
dark country sky the fainter outer portion is larger than
the full moon. It is a nice view in binoculars, but the
tail is very faint.

Exposures up to 2 seconds at f/4 ISO 1600 are about the
maximum to prevent overexposure.

Example image: 36 1-second exposures added:http://www.clarkvision.com/galleries...-1/web/comet.h...

To view the comet, google comet Holmes position and you should
get several charts to use for locating the comet. It appears
in the northeastern sky in the evening.

Roger


It's amazing! This thing went from mag 17 to 2 in a couple days!
Even unguided shot duration shots show it with ease. There has been
some structure derived by some shooters, but I don't know if some of
that are products of post-processing.

http://www.pbase.com/andersonrm/image/88269923


"It is only with the heart that one can see rightly; what is essential
is invisible to the eye"
Antoine de Saint-Exupéry
  #4  
Old November 3rd 07, 08:57 AM posted to rec.photo.digital.slr-systems
C J Campbell
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Posts: 1,272
Default Comet Holmes

On 2007-11-02 06:48:49 -0700, "Roger N. Clark (change username to
rnclark)" said:

There is a very bright comet that is easy to photograph.
The comet 17/P Holmes is in the constellation Perseus and
underwent a 17-million fold increase in brightness in
mid October. It can be viewed in most cities where it
appears about half the diameter of the moon, and from a
dark country sky the fainter outer portion is larger than
the full moon. It is a nice view in binoculars, but the
tail is very faint.

Exposures up to 2 seconds at f/4 ISO 1600 are about the
maximum to prevent overexposure.

Example image: 36 1-second exposures added:
http://www.clarkvision.com/galleries...s2.d-c800.html


To

view the comet, google comet Holmes position and you should
get several charts to use for locating the comet. It appears
in the northeastern sky in the evening.

Roger


I appreciate your posting this, Roger, especially with the instructions
how to shoot it. We cannot see it from our house because there is a low
mountain range in the way (that's what you get for living on a fjord, I
guess) so if I want to see it I will have to make a special trip
somewhere.
--
Waddling Eagle
World Famous Flight Instructor

  #5  
Old November 3rd 07, 03:50 PM posted to rec.photo.digital.slr-systems
[email protected]
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Posts: 28
Default Comet Holmes

On Sat, 03 Nov 2007 04:30:10 GMT, Moonstarer wrote:

The size of it at that distance, being half the
size of the full moon, means at that distance it must be quite huge
indeed. It's believed that it struck an asteroid which caused dust to
fly off of it's surface making it so large.


It is bigger than Jupiter. There's a nice "movie" of the expansion at
Astronomy Picture of the Day for Oct 30:

http://antwrp.gsfc.nasa.gov/apod/ap071030.html

And a close up photo for Nov 3 at:

http://antwrp.gsfc.nasa.gov/apod/astropix.html

Cheers,
DuncanC
  #6  
Old November 4th 07, 01:59 AM posted to rec.photo.digital.slr-systems
RichA
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Posts: 2,544
Default Comet Holmes

On Nov 3, 2:57 am, C J Campbell
wrote:
On 2007-11-02 06:48:49 -0700, "Roger N. Clark (change username to
rnclark)" said:

There is a very bright comet that is easy to photograph.
The comet 17/P Holmes is in the constellation Perseus and
underwent a 17-million fold increase in brightness in
mid October. It can be viewed in most cities where it
appears about half the diameter of the moon, and from a
dark country sky the fainter outer portion is larger than
the full moon. It is a nice view in binoculars, but the
tail is very faint.


Exposures up to 2 seconds at f/4 ISO 1600 are about the
maximum to prevent overexposure.


Example image: 36 1-second exposures added:
http://www.clarkvision.com/galleries...-1/web/comet.h...


To



view the comet, google comet Holmes position and you should
get several charts to use for locating the comet. It appears
in the northeastern sky in the evening.


Roger


I appreciate your posting this, Roger, especially with the instructions
how to shoot it. We cannot see it from our house because there is a low
mountain range in the way (that's what you get for living on a fjord, I
guess) so if I want to see it I will have to make a special trip
somewhere.
--
Waddling Eagle
World Famous Flight Instructor


Where do you live? It should move into view because it crosses the
sky in the course of the night, unless you are really far south.

  #7  
Old November 4th 07, 09:20 AM posted to rec.photo.digital.slr-systems
C J Campbell
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Posts: 1,272
Default Comet Holmes

On 2007-11-03 17:59:08 -0700, RichA said:

On Nov 3, 2:57 am, C J Campbell
wrote:
On 2007-11-02 06:48:49 -0700, "Roger N. Clark (change username to
rnclark)" said:

There is a very bright comet that is easy to photograph.
The comet 17/P Holmes is in the constellation Perseus and
underwent a 17-million fold increase in brightness in
mid October. It can be viewed in most cities where it
appears about half the diameter of the moon, and from a
dark country sky the fainter outer portion is larger than
the full moon. It is a nice view in binoculars, but the
tail is very faint.


Exposures up to 2 seconds at f/4 ISO 1600 are about the
maximum to prevent overexposure.


Example image: 36 1-second exposures added:
http://www.clarkvision.com/galleries...-1/web/comet.h...


To



view the comet, google comet Holmes position and you should
get several charts to use for locating the comet. It appears
in the northeastern sky in the evening.


Roger


I appreciate your posting this, Roger, especially with the instructions
how to shoot it. We cannot see it from our house because there is a low
mountain range in the way (that's what you get for living on a fjord, I
guess) so if I want to see it I will have to make a special trip
somewhere.
--
Waddling Eagle
World Famous Flight Instructor


Where do you live? It should move into view because it crosses the
sky in the course of the night, unless you are really far south.


We live on a fjord, which means we can't be too far south! :-) It is
called Hood Canal and it is located in Washington State. Unfortunately,
although we have been blessed with clear skies in the early evening
lately, it has been clouding up later at night. I was thinking the same
thing, but we really do live where our view of the sky is rather
limited. We have pretty good views to the south, but we never see much
more than part of the tail of the Big Dipper straight overhead.

Because it is a fjord, we back right up to the mountain range. In fact,
if I walk across the road, the land begins to rise almost straight up
except for the little canyon our creek cuts through -- and that is
filled with 200' trees and a fair abundance of wildlife, including
bears. They are 'hibernating' right now, although our local bears are
fairly restless when hibernating. It is not real cold here in winter,
so they frequently wake up and wander around. One of these days I am
going to have to figure out how to photograph them despite the fact
that they are basically nocturnal and they are black. But I digress
and, anyway, have plenty of safer subjects for now. Those bears are
grouchy. One of them mauled a bicyclist near here just a few weeks ago.
Apparently a couple of local dogs had encountered the bear earlier,
irritated it, and the bear was ready to go after the next human he saw,
so he chased down this bicyclist. Even I might have trouble with a
bear. I might have an advantage in weight and reach, but he has speed,
strength, claws and teeth.


--
Waddling Eagle
World Famous Flight Instructor

  #8  
Old November 4th 07, 11:29 AM posted to rec.photo.digital.slr-systems
Mike Coon
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Posts: 77
Default Comet Holmes

C J Campbell wrote:
On 2007-11-03 17:59:08 -0700, RichA said:
... Even I might
have trouble with a bear. I might have an advantage in weight and
reach, but he has speed, strength, claws and teeth.


And I thought that pretty much all bears were heavier than humans. Even a
"waddling eagle" might not be all that heavy ;-) (Compare swans and
albatrosses which waddle and fly superbly!)

Mike.
--
If reply address = connectfee, add an r because it is free not fee.


 




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