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Doubles - WSP - TEC 8"

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#1 Cotts

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Posted 14 February 2013 - 08:23 PM

Double Star fun at the WSP

Using my new TEC 8” f/15.5 Maksutov

Eyepiece lineup:
31 Nagler -->100X, 17 Ethos-->182X, 13 Ethos-->238X, 8 Ethos-->388X, 5 Nagler-->620X

42 Orionis. 05 35.4 -04 50 4.59/7.80 1.5” This was a tough one! 238x showed a bright spot on the first ring and 388x made it quite clear. The fabulous seeing at the WSP assisted. WDS: 1.1” 4.61 7.50

32 Orionis. 05 30.8 +05 57 4.23/5.42 1.3” Easier than 42 even though separation was less. Smaller Delta m of only 1.2 was the deciding factor. Clean, dark sky split with 388x. WDS 1.3” 4.44 5.75

Trapezium E and F. E and F were easily seen with 182x. E, the easier on was seen clearly with 100x

52 Orionis 05 48.0 +06 27 5.30/5.30 1.3” 388x showed textbook dark sky split. The optics on this scope are perfect. WDS 1.1” 5.99 6.03

Beta Monocerotis 06 28.8 -07 02 4.6/5.4/5.6 7.4”/2.8” Simply the most magnificent triple star in the sky! 182x sufficient for a beautiful view of the three equally yellow components floating in a field with lots of faint field stars. WDS AB 7.1" 4.62 5.00 BC 3.0” 5.00 5.32



Sirius. 5 nights of failure!! Really, I thought I would nab this one. The seeing was excellent and the separation of 9.8” is really up there. I tried early in the evening, late in the evening every evening (5 clear nights in a row). There was just so much scintillation from my eye (it rotated with me when I tested this so I know it wasn’t the scope/eyepiece) that the Pup couldn’t be seen with any certainty. I tried Rigel and Adhara first to gauge the separation so I would know how far away from the primary to look. No luck. Last year I saw it every night with my 16” Teeter - it was so easy that I thought the 8” TEC would show it well, if with some required effort.... I hear it is being seen in 6” and 5” scopes these days so my failure irks me.

3 Monocerotis 06 01.8 -10 36 5.00/8.20 1.9” I love these delicate little pairs. No issue with the split at this separation despite the Delta m. WDS 1.9” 4.99 7.96



Kappa Leporis 05 13.2 -12 56 4.42/7.33 2.3” Easy at 238x I even nabbed this one with the 80mm William Optics FD APO! (it was much harder - took some staring to pick out B) WDS 2.2” 4.43 6.77

Beta Leporis 05 28.2 -20 46 2.83/7.34 2.3” Needed 388x and some staring to get this one. Huge 4.5 Delta m and only 2.3” separation made this one tough. WDS 2.6” 2.90 7.5

Eta Orionis 05 24.5 -02 24 3.63/4.91 1.7” Split with some effort at 238x and easily at 388x. For fun I dropped a 4mm ortho and 1.8x barlow into the 80mm (250x) and was delighted to see two discs touching!! The difference in disc size when moving back and forth between the two scopes was very interesting. WDS 1.8” 3.56 4.87


7 Tauri 03 34.4 +24 28 5.98/6.09 0.7” 388x showed a deeply notched ‘peanut’ but, cranking it up to 620x improved the view. There was certainly a dark line between the two discs (again I’ll mention the superb seeing, allowing me to closely examine the diffraction patterns at length..). The whole Rayleigh/Dawes/CentralObstruction thread ran before my eyes as I tried to determine if this was a dark-sky split or not. Not, I suppose as the discs were touching..... WDS 0.7” 6.60 6.86

Omicron 2 Eridani. 04 15.3 -07 39 4.42/9.72/11.2 83”/9” The BC pair is the interesting one as the brighter is a white dwarf and the fainter one is a red dwarf. I saw no colour difference between these two stars. I guess more aperture would do the trick. WDS BC 8.2” 10.02 11.47



All in all I am delighted with my new scope - it has 98.7 Strehl optics for sure!!

Dave

#2 Ed Wiley

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Posted 14 February 2013 - 09:10 PM

Hi David:

Nothing like an excellent scope for doubles. Dare I ask if you tried any imaging?

I have been trying Adara aka CPO7 aka Epsilon CMa, 5 mags difference, 7" separation with a 1.5mag primary. Have you tried it and did you have success? My last try was near the Panstarrs dome in Maui at 3000 meters with a C9.25 last week. Seeing was so-so. Collimation was not great, no luck. Your experience would be valuable, I am thinking of rolling out my 12.5" on this one.

Good splits!

Ed

#3 Cotts

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Posted 14 February 2013 - 11:16 PM

Hi, Ed. Yes I did a couple of images. Rigel and The trapezium. Both at prime focus, f/15.5 - 3100mm or so (moving mirror focus so exact focal length will have to be found by other means.) The trapezium image was affected by wind, so is a bit 'off' but "E" is clearly visible.. The Rigel image seems pretty good and "B" is clearly visible. These would have been fractions of a second exposures @ ISO 3200. The pics are crops just to show the detail - no exact data. Pics follow...

Dave

#4 Cotts

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Posted 14 February 2013 - 11:17 PM

Rigel

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#5 Cotts

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Posted 14 February 2013 - 11:18 PM

Trapezium

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#6 WRAK

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Posted 15 February 2013 - 04:47 AM

David, nice to read that you are happy with your new scope and that you had excellent seeing conditions - at least for the latter I can only hope for, have bad weather for weeks now.
The advertised data you mention seem to be of very recent origin as the magnitudes are shown with double digits - but at least some of them do not correspond with the current WDS catalogue. What is your source?
Wilfried

#7 Cotts

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Posted 15 February 2013 - 08:13 AM

Wilfried, I used Sky Safari Pro data. I will have a look this morning to see what the discrepancies are. I'll post here.
Dave

#8 Cotts

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Posted 15 February 2013 - 09:45 AM

I have edited my original post. The WDS data follow each entry. I suspect that Sky Safari used data from an older WDS. For some fast-moving doubles Sky Safari actually has orbital elements and gives up to the second double star data.. Not sure which of my pairs have this data.

I could check but I have no more time today.

Dave

#9 nirvanix

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Posted 15 February 2013 - 12:34 PM

I agree about Beta Monocerotis, reminds me of an orary. Can look at it for a long time.

#10 Ed Wiley

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Posted 15 February 2013 - 10:32 PM

Hi Dave:

Looks like you are making progress with the images! Thanks for sharing. Going to TSP this year? I am thinking of setting up for double star imaging.

Ed

#11 azure1961p

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Posted 15 February 2013 - 11:12 PM

Dave, I'm glad the Mak is proving to be all that. You have a great selection that you made the rounds on. I think its wild you imaged the e and f as well as you have and with a dslr no less!!! I'm envious of the seeing you enjoyed down south as its regularly 5/10 up here (in case you missed my whining elsewhere). I skimmed through your list fairly quick but I want to reread and print it out as well for when I go out with my reflector.

Truly, I'm glad the Mak is a great performer for you - must be great to look at too.

Pete

PS: the discrepancies in Sky Safari raise their heads now and again but overall I enjoy using it - I just temper the info with the notion that a cross reference might be in order if it looks squirrelly.

#12 Cotts

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Posted 16 February 2013 - 10:30 AM

Hi, Ed. Yes I am going to TSP. I willl be bringing the TEC on the MachOne. Where do you typically set up? My only two visits before found me on the 'middle field'. I thought I might gun for a spot in the 'upper' this year....

I'm in a bunkhouse called 'Angel's Rest' which seems to be quite a hike from the upper field...

I will be trying more imaging this spring. I need to calibrate exposure and ISO to magnitude reach. Also, to try movies and Registax...

Dave

#13 Cotts

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Posted 16 February 2013 - 10:43 AM

Hi, Pete. Yes, the appearance of E and F (barely) surprised me too.

The best feature of Sky Safari by far is its telescope control linked with its vast database. It is especially good for double stars.

Dave

#14 PJ Anway

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Posted 16 February 2013 - 11:02 AM

Hi David,

Nice observations! I'll bet the WSP seeing was great for double star observations.

#15 azure1961p

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Posted 16 February 2013 - 01:10 PM

Dave,

Incidentally despite the broad distance between Sirius and the pup - at least in my winter seeing, I haven seen even a blemish of a component star. I think its one of those things where either you have the seeing or you don't and its a shutout otherwise. My scope is great on doubles but this one is merely a flickering arc light in my tremulous cold air seeing. Beautiful to watch the whole field flicker but no luck as of yet.

Pete

#16 Ed Wiley

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Posted 16 February 2013 - 02:36 PM

Hi Dave:

last year I set up on the middle field. I might try for the upper this year.

A thought: I have an extra DMK21, the older version with the 098 chip. Nothing wrong with it, but it is not as sensitive as the new 618 chip. I will bring it along if I can remember and let you try it if you are interested. And if so, please bring a flip mirror, I don't have an extra one. Its USB not firewire. After TSP it will probably go up for sale as I am thinking to buy a Flea3 and see how it performs.

Good splits, Ed

#17 Howie Glatter

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Posted 18 February 2013 - 07:11 PM

". . I am delighted with my new scope - it has 98.7 Strehl optics for sure!!"

Dave, I'm sorry I didn't get a chance to observe any doubles with you, but the view of Jupiter I had through your TEC was one of the best at the star party.

Howie

#18 Cotts

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Posted 19 February 2013 - 12:03 AM

". . I am delighted with my new scope - it has 98.7 Strehl optics for sure!!"

Dave, I'm sorry I didn't get a chance to observe any doubles with you, but the view of Jupiter I had through your TEC was one of the best at the star party.

Howie


Thanks, Howie. You'll just have to wait until cherry Springs......

Dave






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