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Some challenging doubles -16 March 2017

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4 months 3 days ago #106537 by flt158
flt158 created the topic: Some challenging doubles -16 March 2017
Hello everyone once again.
Here are some challenging binaries I greatly enjoyed on Thursday night.
And a few multiples also.

1. Rigel was easily split at 112X. The strong blue A component has a magnitude of +0.3. B is +6.8. The separation is a nice 9.5 arc seconds and the PA is 202 degrees. B is almost straight down in my refractor.
2. My first multiple is the famous Trapezium within the Orion Nebula M42 / M43. I could just about make out all 6 stars of Theta 1 Orionis at 167X. Seeing A, B, C and D at 40X is not is problem. However both E and F are about +11 in magnitude. Be warned: these are tough to see!
3. Algjebba (Eta Orionis) was next. It must have been a very clear night. I separated A and B at a mere 140X -which I never had achieved before. The magnitudes are +3.6 and +4.9. The separation is a fixed 1.8 arc seconds. The PA is 77 degrees. I do know that Algjebba is a strong favourite to some of us keen double star enthusiasts. Both components are white with a tint of blue. At 167X, the separation is much more ideal.
4. Almost directly west of Algjebba, there is a faint binary some of you might not know about. Struve 693 is seriously very dim. A is +9.1 and B is +9.5. The separation is 3.5 arc seconds and the PA is 11 degrees. However I only require 112X to see the 2 distinctive stars. They are positioned in a north / south direction. Why not give them a try?
5. As the constellation of Cancer is very prominently positioned right now, I hunted down my old friend Tegmine (Zeta Cancri). This triple star never fails to disappoint. A and C are lovely and tight at 40X. But to see the B component, we need a lot more power. The separation is only 1.1 arc seconds. At 167X, B was not quite separated from A. So out came my 5 mm Nagler which gives me 225X. All 3 stars are most stunning as a result. Their magnitudes are +5.3, +6.3 and +5.9. This is still my favourite triple star alright. The brightness of its stars make all the difference.
6. As many of us now know, the constellation of Taurus has a double -double. All 4 stars lie to the west of M45 the Pleiades. Struve 7 is easily split at 11X. But Struve 401 requires 40X. All 4 suns are effortlessly easy to see as they sit side by side in the western sky at about 9 pm. The separations are 44 and 11 arc seconds. The magnitudes are +6.6, +6.9, +7.4 and +7.8. They are far easier to split than the other famous double -double in Lyra.
7. My last binary of Thursday night is a goodie. High up in the southern sky, I could make out the last 3 stars of one of Gemini's feet. Praepes (Eta Geminorum) is the middle one and the primary has a lovely strong orange -red colour. However it does have a tough tight companion. It is separated by a slim 1.6 arc seconds. The PA is 252 degrees. The system's magnitudes are +3.5 and +6.2. I was truly amazed I could split it at 167X. The B star was very clearly in the 8 o'clock position in my scope. At 225X both stars are plainly separated. By the way the A component is an M class star. I could not make out any colour in the B component. Maybe it is simply white.

Thank you for reading.

Clear skies,
Aubrey.
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4 months 3 days ago #106538 by ploughc
ploughc replied the topic: Some challenging doubles -16 March 2017
Hello Aubrey. some nice doubles there in your report, I must admit I have never seen
the E and F stars of the Trapezium and I found Praepes difficult I had to go to 250x
to get any split.

Pat.
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4 months 3 days ago #106540 by flt158
flt158 replied the topic: Some challenging doubles -16 March 2017
It is no surprise that some scopes require 250X to see A and B of Praepes.
By the way, why is this star got so many optional names.
Praepes, Propus, Tejat Prior and whatever else.
Eta Geminorum is fine with me.
At least that does not change.
It sure has a great colour though.

I hope everything is well with you, Pat.
It has been a little while since we have discussed things on this forum.
Great to hear from you.

Kind regards,

Aubrey.

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4 months 3 days ago #106542 by Fermidox
Fermidox replied the topic: Some challenging doubles -16 March 2017

flt158 wrote: As the constellation of Cancer is very prominently positioned right now, I hunted down my old friend Tegmine (Zeta Cancri). This triple star never fails to disappoint. This is still my favourite triple star alright.

Great report Aubrey. My favourite triple is Beta Monocerotis, but Tegmine is a wonderful sight also.

Finbarr.
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4 months 3 days ago #106543 by flt158
flt158 replied the topic: Some challenging doubles -16 March 2017
It is high time I had a look at Beta Monocerotis.
It must have been back in the 1980's since I observed him.
Thank you, Finbarr, for your encouragement to check it out.

Aubrey.

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