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Beta Monoceros

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#1 Starobserver

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Posted 19 February 2019 - 11:15 AM

Last week I observed Beta Monoceros, one of my favourite triples.....   I used a 100mm f/10 fraunhofer refractor combined with a 7mm Vixen Lanthanum eyepiece. Transparency was 4 out of 5, seeing mediocre.. The observation is done from a suburban backyard with a nlem of 4.8.  Here's an impression of what it looked like through the eyepiece. North is up, west is to the left. fov is 21' and magnification is 143x

 

beta monoceros.jpg

 

 


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#2 dmdouglass

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Posted 19 February 2019 - 02:55 PM

An interesting observation, and sketch.

I was (and still am) trying to reconcile it with an image i captured on Jan 08 of this year.

 

Of course, Beta Mon [ 11 Beta Mon ] has many other names... (common practice with astronomy).

It actually forms two of the Herschel Double Stars...

H-1-010  with is STF-919 BC

and H-2-017 which is STF-919 AB

And  then, two (2) of the component stars are SAO-133316 and 133317.

 

I have both a regular image, and then one taken with a 2x barlow.  

 

 

Of special interest here is the WDS data, shown at the bottom below.

It shows the components as:

 

AB  Angle 133 Degrees  and 7.1 ArcSec separation (measured from top [N} down through the left [E].

AC  Angle 125 Degrees and 9.8 ArcSec separation

AD  Angle 055 Degrees and 26.6 Arc Sec separation.

 

Thus, in my image, the upper right of the two bright stars (shown lower left) is the "A" star.

Lower left is the "B" star.

And now insert in the lower right of the image, clearly is showing the "D" star in the correct position.

 

My image(s) can be viewed here:

http://www.az-dahut....DS-20190108.JPG

 

In my images, N is up (same as your sketch), but E is to the left.


Edited by dmdouglass, 19 February 2019 - 02:56 PM.


#3 dmdouglass

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Posted 19 February 2019 - 02:59 PM

Thought i might same some time, here is the observation sheet:

 

H-2-017-DS-20190108.jpg

 


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