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Zeta Orionis or Alnitak - A Double Star in Orion

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#1 TienTran@134

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Posted 24 February 2024 - 08:33 PM

   Zeta Orionis or Alnitak is one of the Belt stars of Orion. This pair consists of a first magnitude O-type primary star and a third mag secondary; seperate by just 2.3". There is a third companion; it is a 9th mag star hovering just 58" away from the primary; close enough for the observer to appreciate the beauty but not close enough to be drown in the glare of the primary. 

 

   I have observed this pair many times; my 80mm scope reveals its 9th mag companion. And the 6 inch breaks this star into 3 distinct points of light. This pair is very seeing sensitive. It can be very tough to split if the seeing condition is turbulent.

   My 6 inch started to split the first and secondary star (A and B star) at 142x. At 225x, the B star could be seen just outside the primary's second diffraction rings. The color I recorded was bluish white for the primary and silvery white for the secondary. 

 

   I include 2 pencil sketches and the digitized one below. Pencil sketches are the view through 142x and 225x magnification. Both then got digitized in Photoshop. 

 

   Thank you for reading and Clear Sky to you waytogo.gif waytogo.gif waytogo.gif !!!

Attached Thumbnails

  • Zeta Orionis.png
  • Zeta Ori.jpg
  • Zeta Ori (HM).jpg

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#2 frank5817

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Posted 24 February 2024 - 08:42 PM

Tien,

 

Very fine sketches of Zeta Orionis.

Well done.

 

Frank smile.gif


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#3 bphaneuf

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Posted 24 February 2024 - 08:42 PM

Precise and meticulous work as always Tien.  The care you take with the magnitudes and airy disk put us right into your eyepiece!  Your notes are a helpful resource for any who repeat your observation.  Wonderful images of your whole process.  Thanks for this.

Clear skies and dry paper,

-b


Edited by bphaneuf, 24 February 2024 - 08:43 PM.

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#4 CBM1970

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Posted 24 February 2024 - 09:25 PM

These are really excellent! I didn't actually know Alnitak was a multiple star. I'm going to need to see if I can get a look at B and C in the near future. I'm not sure if the Maine winter seeing will let me see the B component, but I'll give it a try.


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#5 mdowns

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Posted 25 February 2024 - 09:37 AM

I always enjoy both your drawings, and your method of presentation Tien.Nicely done!


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#6 TienTran@134

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Posted 26 February 2024 - 04:58 AM

Tien,

 

Very fine sketches of Zeta Orionis.

Well done.

 

Frank smile.gif

 

I always enjoy both your drawings, and your method of presentation Tien.Nicely done!

 

Precise and meticulous work as always Tien.  The care you take with the magnitudes and airy disk put us right into your eyepiece!  Your notes are a helpful resource for any who repeat your observation.  Wonderful images of your whole process.  Thanks for this.

Clear skies and dry paper,

-b

   Thank you all for your kind comments !!! 

    Clear Sky to all of you waytogo.gif waytogo.gif waytogo.gif !!!

 

These are really excellent! I didn't actually know Alnitak was a multiple star. I'm going to need to see if I can get a look at B and C in the near future. I'm not sure if the Maine winter seeing will let me see the B component, but I'll give it a try.

   Just give it a try !!! I I had failed a couple of times before I was able successfully split this one.

    Also be sure to check out Sigma Orionis, another very fine star system in the region. If you have dark sky then go for the Flame or Horsehead Nebula. This area is filled with amazing objects. 

   Clear Sky to you waytogo.gif waytogo.gif waytogo.gif !!!



#7 niteskystargazer

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Posted 26 February 2024 - 10:49 AM

Tien,

 

Very nice sketch of Zeta Orionis or Alnitak - (A Double Star in Orion) smile.gif .

 

CDS,KLU,

 

thanx.gif ,

 

Tom


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#8 Uwe Pilz

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Posted 27 February 2024 - 11:58 AM

I like your pencil sketches very much.


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#9 AstroBoyInTheCity

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Posted 27 February 2024 - 09:22 PM

Beautiful Halo and star spikes!


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#10 TienTran@134

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Posted 28 February 2024 - 07:06 PM

Beautiful Halo and star spikes!

 

I like your pencil sketches very much.

 

Tien,

 

Very nice sketch of Zeta Orionis or Alnitak - (A Double Star in Orion) smile.gif .

 

CDS,KLU,

 

thanx.gif ,

 

Tom

Thanks a lot for your kind comments waytogo.gif waytogo.gif waytogo.gif !!!



#11 Randolph Jay

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Posted 29 February 2024 - 01:26 PM

You've got the touch! 

Clear skies,

Randolph


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#12 Uwe Pilz

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Posted 05 March 2024 - 06:49 AM

A few days ago, I observed it (again) with my 12-cm refractror. This time I looked for compontent C. Very nice, thank you for pointing at it.


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#13 TienTran@134

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Posted 05 March 2024 - 07:44 PM

A few days ago, I observed it (again) with my 12-cm refractror. This time I looked for compontent C. Very nice, thank you for pointing at it.

   It should be pointed out that the C component doesn't belong to the system it is a foreground star. Other than that this is still a very fine double star to look at.

   Clear Sky to you waytogo.gif waytogo.gif waytogo.gif !!! 



#14 JMSchwartz

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Posted 13 March 2024 - 07:52 PM

Tien that scope is super sharp and so is your sketch well done thanks for sharing. 

CS Jon 


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