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Mysterious hot spots observed in Betelgeuse
On a sunny day (Sat, 27 Apr 2013 18:20:16 -0500) it happened Sam Wormley
wrote in : On 4/27/13 5:22 PM, wrote: On Sat, 27 Apr 2013 16:02:26 -0500, Sam Wormley wrote: Ozone and oxygen in the earth's atmosphere blocks most gamma, x-ray and hard UV. UV yes but the gamma will only burn off the ozone Electromagnetic Radiation: Interactions in the Atmosphere http://www.geo.oregonstate.edu/class...S/lecture3.pdf AHA!!! WE SHOULD MAKE AS MUCH POLLUTION A POSSIBLE TO PROTECT OURSELVES. |
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Mysterious hot spots observed in Betelgeuse
On 28/04/2013 4:01 AM, Jan Panteltje wrote:
On a sunny day (Sat, 27 Apr 2013 18:20:16 -0500) it happened Sam Wormley wrote in : On 4/27/13 5:22 PM, wrote: On Sat, 27 Apr 2013 16:02:26 -0500, Sam Wormley wrote: Ozone and oxygen in the earth's atmosphere blocks most gamma, x-ray and hard UV. UV yes but the gamma will only burn off the ozone Electromagnetic Radiation: Interactions in the Atmosphere http://www.geo.oregonstate.edu/class...S/lecture3.pdf AHA!!! WE SHOULD MAKE AS MUCH POLLUTION A POSSIBLE TO PROTECT OURSELVES. It's a little ironic, but some studies are now blaming the 1980's push to reduce acid rain by environmentalists as the reason for global warming nowadays. The sulphuric acid in the air was considered a global cooler! Yousuf Khan |
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Mysterious hot spots observed in Betelgeuse
In sci.astro message , Fri, 26 Apr 2013
20:31:11, Yousuf Khan posted: On a side note, one of my goals in life is to have a life long enough to see Betelgeuse explode as a supernova. It must be spectacular to be able to see an astronomical object besides the Sun during the daylight hours! Rumour has it that, outside the monsoon season, one can often easily enough see the astronomical Moon in full daylight; and I gather that some people can see Venus too. -- (c) John Stockton, nr London, UK. Mail via homepage. Turnpike v6.05 MIME. Web http://www.merlyn.demon.co.uk/ - FAQqish topics, acronyms and links; Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc. |
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Mysterious hot spots observed in Betelgeuse
On 4/28/13 11:28 AM, Dr J R Stockton wrote:
In sci.astro message , Fri, 26 Apr 2013 20:31:11, Yousuf Khan posted: On a side note, one of my goals in life is to have a life long enough to see Betelgeuse explode as a supernova. It must be spectacular to be able to see an astronomical object besides the Sun during the daylight hours! Rumour has it that, outside the monsoon season, one can often easily enough see the astronomical Moon in full daylight; and I gather that some people can see Venus too. 10 surprising space objects to see in the daytime sky http://earthsky.org/space/10-surpris...he-daytime-sky |
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Mysterious hot spots observed in Betelgeuse
On 27/04/2013 01:31, Yousuf Khan wrote:
On a side note, one of my goals in life is to have a life long enough to see Betelgeuse explode as a supernova. It must be spectacular to be able to see an astronomical object besides the Sun during the daylight hours! Betelgeuse may be the only star close enough to become bright enough to see in the daylight. I don't know if anything like this was ever seen on Earth before, but if it was, then it must've been the dinosaurs or the amoebas who saw it back then. If it was the dinos, then they must've been simply puzzled by the good nocturnal hunting conditions that were suddenly available. If it was the amoebas & algaes, then they must've just been surprised by how easy it was to photosynthesize at night. The last one seen in daytime from Earth as far as we know was the supernova of the star that gave rise to the Crab Nebula in 1054 as recorded by the Chinese astronomers and natives of South America. eg http://messier.seds.org/more/m001_sn.html The star that gave rise to the Cass A SNR would have been visible but for the enormous amount of dust and gas in the galactic plane. It was probably just about seen seredipitously by Flamsteed. http://messier.seds.org/more/m001_sn.html The hot spots appear on opposite sides of Betelgeuse, separated by about half the star’s visual diameter. They have a temperature of about 6700°–8500° Fahrenheit (3700°–4700° Celsius), much higher than the average temperature of the star’s radio surface (some 1700° F [930° C]) and even higher than the 6000° F (3300° C) visual surface. The arc of cool gas lies almost 4.5 million miles (7.4 billion kilometers) away from the star — about the same as Pluto’s farthest distance from the Sun. Scientists estimate the gas has a mass almost two-thirds that of the Earth and a temperature of only –190° F (–123° C). Mysterious hot spots observed in Betelgeuse - Astronomy Magazine http://www.astronomy.com/~/link.aspx...f-ae413109c481 Yousuf Khan They might be newer higher resolution observations but it is old news: http://www.universetoday.com/42361/betelgeuse/ -- Regards, Martin Brown |
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Mysterious hot spots observed in Betelgeuse
On 28/04/2013 17:28, Dr J R Stockton wrote:
In sci.astro message , Fri, 26 Apr 2013 20:31:11, Yousuf Khan posted: On a side note, one of my goals in life is to have a life long enough to see Betelgeuse explode as a supernova. It must be spectacular to be able to see an astronomical object besides the Sun during the daylight hours! Rumour has it that, outside the monsoon season, one can often easily enough see the astronomical Moon in full daylight; and I gather that some people can see Venus too. Most people can see Venus at or near maximum elongation in the daytime. The trick is to stand in the shadow of a large building so that your eye pupil is not a pinpoint and to focus at infinity. This latter trick is rather hard and it helps to have an aircraft trail or moon nearby. Once you see Venus you wonder how you could miss it, but if you lose concentration for a moment you can easily lose it again until you know exactly where to look and adjust your focus. As students we sometimes used to start a small crowd looking at the fixed bright light in the sky. Meandering off quietly after a self sustaining crowd had developed. -- Regards, Martin Brown |
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Mysterious hot spots observed in Betelgeuse
Martin Brown posted Mon, 29 Apr 2013 07:15:20 +0100 Most people can see Venus at or near maximum elongation in the daytime. The trick is to stand in the shadow of a large building so that your eye pupil is not a pinpoint and to focus at infinity. This latter trick is rather hard and it helps to have an aircraft trail or moon nearby. Once you see Venus you wonder how you could miss it, but if you lose concentration for a moment you can easily lose it again until you know exactly where to look and adjust your focus. As students we sometimes used to start a small crowd looking at the fixed bright light in the sky. Meandering off quietly after a self sustaining crowd had developed. It would may help to track Morning Star until full daylight..... Note that SN1604 - Kepler's Supernova was by intensity near at middle between Venus and Jupiter. http://en.wikipedia.org/wiki/Kepler%27s_Supernova -- Poutnik |
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Mysterious hot spots observed in Betelgeuse
On 29/04/2013 08:04, Poutnik wrote:
Martin Brown posted Mon, 29 Apr 2013 07:15:20 +0100 Most people can see Venus at or near maximum elongation in the daytime. The trick is to stand in the shadow of a large building so that your eye pupil is not a pinpoint and to focus at infinity. This latter trick is rather hard and it helps to have an aircraft trail or moon nearby. Once you see Venus you wonder how you could miss it, but if you lose concentration for a moment you can easily lose it again until you know exactly where to look and adjust your focus. As students we sometimes used to start a small crowd looking at the fixed bright light in the sky. Meandering off quietly after a self sustaining crowd had developed. It would may help to track Morning Star until full daylight..... You can do it at my latitude even at midday. The trick really is looking in *exactly* the right place and focussing at infinity. Standing in a gap between two tall buildings is one way to do this. Note that SN1604 - Kepler's Supernova was by intensity near at middle between Venus and Jupiter. http://en.wikipedia.org/wiki/Kepler%27s_Supernova AFAIK no-one at that time recorded seeing it in daylight although it was theoretically possible to do so. -- Regards, Martin Brown |
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Mysterious hot spots observed in Betelgeuse
Martin Brown posted Mon, 29 Apr 2013 10:21:49 +0100 It would may help to track Morning Star until full daylight..... You can do it at my latitude even at midday. The trick really is looking in *exactly* the right place and focussing at infinity. Standing in a gap between two tall buildings is one way to do this. The point is it is not easy for ordinary man to know exact position, even if you know Right ascension / declination or azimute/elevation, if you do not have handy some tools/devices for that. Note that SN1604 - Kepler's Supernova was by intensity near at middle between Venus and Jupiter. http://en.wikipedia.org/wiki/Kepler%27s_Supernova AFAIK no-one at that time recorded seeing it in daylight although it was theoretically possible to do so. Neither I am aware of. -- Poutnik |
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Mysterious hot spots observed in Betelgeuse
On 29/04/2013 16:35, Poutnik wrote:
Martin Brown posted Mon, 29 Apr 2013 10:21:49 +0100 It would may help to track Morning Star until full daylight..... You can do it at my latitude even at midday. The trick really is looking in *exactly* the right place and focussing at infinity. Standing in a gap between two tall buildings is one way to do this. The point is it is not easy for ordinary man to know exact position, even if you know Right ascension / declination or azimute/elevation, if you do not have handy some tools/devices for that. Used to be true but these days there are any number of apps for GPS enabled smart phones and tablets that can do it with relative ease. The trick we used was knowing exactly where to look having pre computed it using the edge of a building and a time. Once you have seen it you pass it on to a small crowd and then quietly move away. No mention of what it is - works better that way particularly if you get one or two highly suggestible people who can see it and point out marvellous imaginings to the others. -- Regards, Martin Brown |
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