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More than meets the eye: Delta Orionis in Orion's belt

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  More than meets the eye: Delta Orionis in Orion's belt Sam Wormley <swormley1@gmail.com> - 2015-11-12 19:49 -0600
    Re: More than meets the eye: Delta Orionis in Orion's belt pnalsing@gmail.com - 2015-11-12 18:23 -0800
      Re: More than meets the eye: Delta Orionis in Orion's belt Sam Wormley <swormley1@gmail.com> - 2015-11-12 20:31 -0600
      Re: More than meets the eye: Delta Orionis in Orion's belt Fabian Russell <root@localhost.localdomain> - 2015-11-13 04:26 +0000
        Re: More than meets the eye: Delta Orionis in Orion's belt pnalsing@gmail.com - 2015-11-12 20:43 -0800
        Re: More than meets the eye: Delta Orionis in Orion's belt jimp@specsol.spam.sux.com - 2015-11-13 04:43 +0000
    Re: More than meets the eye: Delta Orionis in Orion's belt Double-A <double-a3@hush.com> - 2015-11-13 14:06 -0800
      Re: More than meets the eye: Delta Orionis in Orion's belt pnalsing@gmail.com - 2015-11-13 20:16 -0800

#532590 — More than meets the eye: Delta Orionis in Orion's belt

More than meets the eye: Delta Orionis in Orion's belt
> http://phys.org/news/2015-11-eye-delta-orionis-orion-belt.html

> One of the most recognizable constellations in the sky is Orion, the
> Hunter. Among Orion's best-known features is the "belt," consisting
> of three bright stars in a line, each of which can be seen without a
> telescope.
>
> The westernmost star in Orion's belt is known officially as Delta
> Orionis. (Since it has been observed for centuries by sky-watchers
> around the world, it also goes by many other names in various
> cultures, like "Mintaka.") Modern astronomers know that Delta Orionis
> is not simply one single star, but rather it is a complex multiple
> star system.
>
> Delta Orionis is a small stellar group with three components and five
> stars in total: Delta Ori A, Delta Ori B, and Delta Ori C. Both Delta
> Ori B and Delta Ori C are single stars and may give off small amounts
> of X-rays. Delta Ori A, on the other hand, has been detected as a
> strong X-ray source and is itself a triple star system as shown in
> the artist's illustration.
>
> In Delta Ori A, two closely separated stars orbit around each other
> every 5.7 days, while a third star orbits this pair with a period of
> over 400 years. The more massive, or primary, star in the
> closely-separated stellar pair weighs about 25 times the mass of the
> Sun, whereas the less massive, or secondary star, weighs about 10
> times the mass of the Sun.
>
> The chance alignment of this pair of stars allows one star to pass in
> front of the other during every orbit from the vantage point of
> Earth. This special class of star system is known as an "eclipsing
> binary," and it gives astronomers a direct way to measure the mass
> and size of the stars.


-- 

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to the discussion of physics, news from the physics
community, and physics-related social issues.

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#532608

On Thursday, November 12, 2015 at 5:49:48 PM UTC-8, Sam Wormley wrote:
> More than meets the eye: Delta Orionis in Orion's belt
> > http://phys.org/news/2015-11-eye-delta-orionis-orion-belt.html
> 
> > One of the most recognizable constellations in the sky is Orion, the
> > Hunter. Among Orion's best-known features is the "belt," consisting
> > of three bright stars in a line, each of which can be seen without a
> > telescope.
> >
> > The westernmost star in Orion's belt is known officially as Delta
> > Orionis. (Since it has been observed for centuries by sky-watchers
> > around the world, it also goes by many other names in various
> > cultures, like "Mintaka.") Modern astronomers know that Delta Orionis
> > is not simply one single star, but rather it is a complex multiple
> > star system.
> >
> > Delta Orionis is a small stellar group with three components and five
> > stars in total: Delta Ori A, Delta Ori B, and Delta Ori C. Both Delta
> > Ori B and Delta Ori C are single stars and may give off small amounts
> > of X-rays. Delta Ori A, on the other hand, has been detected as a
> > strong X-ray source and is itself a triple star system as shown in
> > the artist's illustration.
> >
> > In Delta Ori A, two closely separated stars orbit around each other
> > every 5.7 days, while a third star orbits this pair with a period of
> > over 400 years. The more massive, or primary, star in the
> > closely-separated stellar pair weighs about 25 times the mass of the
> > Sun, whereas the less massive, or secondary star, weighs about 10
> > times the mass of the Sun.
> >
> > The chance alignment of this pair of stars allows one star to pass in
> > front of the other during every orbit from the vantage point of
> > Earth. This special class of star system is known as an "eclipsing
> > binary," and it gives astronomers a direct way to measure the mass
> > and size of the stars.
> 
> 
> -- 
> 
> sci.physics is an unmoderated newsgroup dedicated
> to the discussion of physics, news from the physics
> community, and physics-related social issues.

Actually, Sam, all (3) of the Belt Stars, Alnilam, Alnitak, and Mintaka, are at least double stars. For me, Zeta Orionis (Alnilam) is the most interesting, because it is a triple star and is immediately adjacent to the Flame Nebula (aka Tank Track Nebula), a wondrous sight in a telescope of almost any size.

\Paul A

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#532616

On 11/12/15 8:23 PM, pnalsing@gmail.com wrote:
> On Thursday, November 12, 2015 at 5:49:48 PM UTC-8, Sam Wormley wrote:
>> More than meets the eye: Delta Orionis in Orion's belt
>>> http://phys.org/news/2015-11-eye-delta-orionis-orion-belt.html
>>
>>> One of the most recognizable constellations in the sky is Orion, the
>>> Hunter. Among Orion's best-known features is the "belt," consisting
>>> of three bright stars in a line, each of which can be seen without a
>>> telescope.
>>>
>>> The westernmost star in Orion's belt is known officially as Delta
>>> Orionis. (Since it has been observed for centuries by sky-watchers
>>> around the world, it also goes by many other names in various
>>> cultures, like "Mintaka.") Modern astronomers know that Delta Orionis
>>> is not simply one single star, but rather it is a complex multiple
>>> star system.
>>>
>>> Delta Orionis is a small stellar group with three components and five
>>> stars in total: Delta Ori A, Delta Ori B, and Delta Ori C. Both Delta
>>> Ori B and Delta Ori C are single stars and may give off small amounts
>>> of X-rays. Delta Ori A, on the other hand, has been detected as a
>>> strong X-ray source and is itself a triple star system as shown in
>>> the artist's illustration.
>>>
>>> In Delta Ori A, two closely separated stars orbit around each other
>>> every 5.7 days, while a third star orbits this pair with a period of
>>> over 400 years. The more massive, or primary, star in the
>>> closely-separated stellar pair weighs about 25 times the mass of the
>>> Sun, whereas the less massive, or secondary star, weighs about 10
>>> times the mass of the Sun.
>>>
>>> The chance alignment of this pair of stars allows one star to pass in
>>> front of the other during every orbit from the vantage point of
>>> Earth. This special class of star system is known as an "eclipsing
>>> binary," and it gives astronomers a direct way to measure the mass
>>> and size of the stars.
>>
>>
>> --
>>
>> sci.physics is an unmoderated newsgroup dedicated
>> to the discussion of physics, news from the physics
>> community, and physics-related social issues.
>
> Actually, Sam, all (3) of the Belt Stars, Alnilam, Alnitak, and Mintaka, are at least double stars. For me, Zeta Orionis (Alnilam) is the most interesting, because it is a triple star and is immediately adjacent to the Flame Nebula (aka Tank Track Nebula), a wondrous sight in a telescope of almost any size.
>
> \Paul A
>


   I agree, Paul. Thanks.


-- 

sci.physics is an unmoderated newsgroup dedicated
to the discussion of physics, news from the physics
community, and physics-related social issues.

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#532642

On Thu, 12 Nov 2015 18:23:58 -0800, pnalsing wrote:

> 
> a wondrous sight in a telescope of almost any size.
> 

Where the fsck do you reside?  The stars are not visible virtually
anywhere in an urban civilization.  Light pollution is getting
worse and not better.

Except maybe on a mountain top in Hawaii.

But there we have those crazies who oppose the construction
of observatories because they will violates the environment
and spirit of the mountain.

Ha, ha, ha, ha, ha!  Sammmy Sambo must be in a quandry.  To be true
to science he must support the astronomers.  To be true to his leftist
masters he must support the enviro-spirits.

It must be tough being a dumb-fsck liberal.

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#532643

On Thursday, November 12, 2015 at 8:28:01 PM UTC-8, Fabian Russell wrote:
> On Thu, 12 Nov 2015 18:23:58 -0800, pnalsing wrote:
> 
> > 
> > a wondrous sight in a telescope of almost any size.
> > 
> 
> Where the fsck do you reside?  The stars are not visible virtually
> anywhere in an urban civilization.  Light pollution is getting
> worse and not better.

The belt of Orion is visible from almost any location on Earth that is not downtown in a major city, assuming the weather is clear, these are bright stars.

Personally, I travel a modest distance every new-moon weekend to avoid light of any kind, and successfully enjoy the night sky at every opportunity... it's what I do, it's my hobby and passion.

Light pollution is definitely getting worse every year, in most locations, but here in the American west there are still many, many place that have reasonably dark skies and are reasonably accessible. In this respect I am very lucky indeed.

YMMV.

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#532647

Fabian Russell <root@localhost.localdomain> wrote:
> On Thu, 12 Nov 2015 18:23:58 -0800, pnalsing wrote:
> 
>> 
>> a wondrous sight in a telescope of almost any size.
>> 
> 
> Where the fsck do you reside?  The stars are not visible virtually
> anywhere in an urban civilization.  Light pollution is getting
> worse and not better.

Yet more babbling nonsense.

Is there no subject where you don't have a very strong, and very wrong,
opinion?


-- 
Jim Pennino

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#532857

On Thursday, November 12, 2015 at 5:49:48 PM UTC-8, Sam Wormley wrote:
> More than meets the eye: Delta Orionis in Orion's belt
> > http://phys.org/news/2015-11-eye-delta-orionis-orion-belt.html
> 
> > One of the most recognizable constellations in the sky is Orion, the
> > Hunter. Among Orion's best-known features is the "belt," consisting
> > of three bright stars in a line, each of which can be seen without a
> > telescope.
> >
> > The westernmost star in Orion's belt is known officially as Delta
> > Orionis. (Since it has been observed for centuries by sky-watchers
> > around the world, it also goes by many other names in various
> > cultures, like "Mintaka.") Modern astronomers know that Delta Orionis
> > is not simply one single star, but rather it is a complex multiple
> > star system.
> >
> > Delta Orionis is a small stellar group with three components and five
> > stars in total: Delta Ori A, Delta Ori B, and Delta Ori C. Both Delta
> > Ori B and Delta Ori C are single stars and may give off small amounts
> > of X-rays. Delta Ori A, on the other hand, has been detected as a
> > strong X-ray source and is itself a triple star system as shown in
> > the artist's illustration.
> >
> > In Delta Ori A, two closely separated stars orbit around each other
> > every 5.7 days, while a third star orbits this pair with a period of
> > over 400 years. The more massive, or primary, star in the
> > closely-separated stellar pair weighs about 25 times the mass of the
> > Sun, whereas the less massive, or secondary star, weighs about 10
> > times the mass of the Sun.
> >
> > The chance alignment of this pair of stars allows one star to pass in
> > front of the other during every orbit from the vantage point of
> > Earth. This special class of star system is known as an "eclipsing
> > binary," and it gives astronomers a direct way to measure the mass
> > and size of the stars.


Orion's dagger is more interesting.  There you can see the fuzzy Orion Nebula even with the naked eye.

Double-A

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#532969

On Friday, November 13, 2015 at 2:06:44 PM UTC-8, Double-A wrote:

> Orion's dagger is more interesting.  There you can see the fuzzy Orion Nebula even with the naked eye.

More often called Orion's Sword, but yes, the Great Orion Nebula is indeed a naked-eye object.

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