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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 |
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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 |
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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 |
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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 |
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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 |
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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. |
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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 |
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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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