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Sirius and the Pup

Discussion in 'Observing Celestial Objects' started by Ed D, Oct 23, 2017.

Sirius and the Pup

Started by Ed D on Oct 23, 2017 at 5:38 AM

4 Replies 1584 Views 4 Likes

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  1. Ed D

    Ed D Well-Known Member

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    I live in an area that's a mixed bag for observing. While the light pollution is horrendous in Miami I am located at 25.5deg North. This places many objects high in the sky that are low to most observers in North America. The weather here is extremely hot, extremely humid, and with a seemingly never ending cloud cover. But, in the morning hours the concrete jungle has cooled sufficiently, the clouds are minimal and the temperatures comfortable to us, not to mention the light pollution is somewhat reduced.

    Lately I have been reading about double stars and small refractors. My 60mm f/15 has been sitting idly for days waiting for the clouds to clear. This weekend I felt poorly and called in sick this morning, not having slept most of the night. It was 6:00am and the clouds were minimal. I decided to take the 60mm Meade, a vintage Taiwan made scope with superb optics, outside. I mounted it on the Twilight I, and decided on a 32mm Celestron Plossl, a 15mm Knight Owl Plossl, and the GSO 2x Shorty Barlow. Morning twilight was minutes from beginning.

    I inserted the 32mm in the diagonal and started taking in some beautiful sights with 28x magnification. The Pleiades fit into the field of view showing its stars as sharp little dots. I then went to Orion and observed the Sword region, the two clusters and the nebula. I was amazed that this little gem could show the four stars of the Trapezium distinctly at such low magnification. I also spied several stars, including doubles/multiples. I then went to Sirius and saw the open cluster South of Sirius A, and several other stars.

    My curiosity got the better of me and I pointed the little toothpick of a scope at Sirius, not expecting to see anything more than the brightest shining star in the night sky. My Lord, it was beautiful. I recalled in years past how I was able to see the Pup, Sirius B, with my AT72ED at magnifications well below 100x. I have never been able to snag the Pup in darkness, always during twilight, no matter the scope.

    I switched from the 32mm Celestron Plossl to my coveted 15mm Knight Owl Plossl. I wish I would have bought a complete set of these low cost gems when Owl Astronomy was in business. Sirius was bright with lots of diffraction rings shimmering in the eyepiece. At 60x I could detect something was there, but no definitive Pup. I tried the 15mm with the 2x Barlow but magnification was a bit high at 120x and the image dimmer that I wanted. I then used the Barlow cell on the eyepiece for around 90x. The image was bright enough to my liking. I could move my eye around the field of view and minimize the brilliance and the diffraction rings. While taking in the beauty of Sirius I spotted something popping in and out of view at 2 o'clock. I though "No, this can't be". But, after a few seconds, there it was again! I kept observing and realized it was indeed the Pup that was popping in and out of view, infrequently, but nevertheless there. I continued enjoying this for several minutes, long enough to see the Pup many times and confirm I was actually seeing it.

    The morning was beginning to get brighter but I was still enjoying the views. It was finally just before the sun popped up over the horizon that I decide to pack it up. Sirius B is currently near its largest separation from the main star, making it easier to see, but still quite difficult. I had split Sirius A and B before in my AT72ED at magnifications around 75x, if I remember correctly. However, I was shocked and surprised that I could do it with a 60mm f/15. There have been other observers in Florida that have seen the Pup with small scopes, one from Tampa coming to mind. But, with a 60mm? This blew my mind, even with a huge advantage of location and conditions.

    Ed D
     
  2. bladekeeper

    bladekeeper Active Member

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    Congrats on bagging the Pup in the 60mm, Ed!

    I've yet to catch sight of it. I'm much better armed this season though, so I'm hoping to add it to my log book this winter. :)
     
  3. Dave In Vermont

    Dave In Vermont Well-Known Member

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    I wished I'd found this post/thread earlier - this is truly a great post! Sighting that elusive 'Pup' is always a fascinating subject to me.

    So it was found at about 90X in a 60mm F/15 achromatic refractor? VERY interesting. And from your experience - a key factor is being in the twilight(s) of the day. All in all I'd say this is an experiment I think is something I'd like to reconstruct! Right down to the use of a Barlow-cell. I don't have a 60mm refractor - but I can jury-rig a similar instrument. And check out people who are cleaning out their attic or garage.....

    I'm always trying to do crazy things - like what I call "Peeling-the-Onion," which is to say finding new ways to observe the planet Venus. Why not such towards grabbing a 'Pup' by it's tail....?

    Wonderful post, Ed! Thank you!

    Dave
     
  4. Ed D

    Ed D Well-Known Member

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    Dave, I have a heck of an advantage being located far South. Sirius is pretty high up in the sky, lot less atmosphere to look through, especially since Sirius B isn't all that bright. But, nothing like a good challenge.

    Ed D
     
  5. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Indeed you are far South of my location up here at 44.29N. Up here Sirius presents itself as a multi-colored 'sparkler' scintillating red-blue-orange-yellow, etc. Which should make my quest all-the-more 'interesting.' Ever hear the 'Old Chinese-Curse' - "May you live in interesting times."?

    However - I can about match the aperture - 60mm - of the instrument you used. I can stretch my F.L. using some of my collection of $$$ Focal-Reducers/Extenders and all manner of 'toys' I've got. I know how to block-out Sirius A. All manner of tricks. And this strikes me as being 'Fun!'

    Up here in Podunk, Sirius isn't exactly hugging the horizon though. If it were, it would likely join Venus in being confused with alien-spacecraft. I'm certain it will, nonetheless, present a worthy challenge. And that's half-the-fun! And I have your great report to thank for inspiring me to embrace my madness! :p

    There Goes the Neighborhood -

    Dave :eek:
     

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