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.

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

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.

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

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

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

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

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

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

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