My tale of Trapezium F - finally
Posted 28 September 2012 - 05:15 AM
I've since replaced the stock mirror with a Zambuto. I'm still getting my legs with it a bit and am going thru many old favorites to see if there's anything new I can make out with my new mirror.
Seeing was supposed to be very good tonight, so I was looking forward to see how the Zambuto would do on planetary. I waited for Jupiter to come up. It was glorious at 400x when the seeing steadied. Spent a couple hours looking at it. I started to pack up around 2 am and realized Orion was coming up. So I thought I'd check out the nebula.
The nebula was still very low - maybe 20 degrees above the horizon, but I swung the scope over at low power and checked it out. Even without a filter there appeared to be much more nebulosity than I remember - love that Zambuto. Beautiful. Ah yes, the trapezium! Could I see the F star?!
I put in a 7mm Pentax XW and took a look. When I think of all the times I tried to see the F star and failed, and here it was as easy as pie - at 20 degrees above the horizon. Wonderful. Seeing stars A-F is really a beautiful thing.
Now, maybe the skies were just particularly steady, or the Zambuto is just a way better mirror than the stock mirror, or both. But it was almost funny how easy I could see A-F.
I've seen many posts here how the F star has been seen with 80mm - 100mm scopes. Wow. Maybe one of these days I'll be able to pick it up with my refractor.
Posted 28 September 2012 - 07:42 AM
Posted 28 September 2012 - 08:31 AM
Posted 28 September 2012 - 10:52 AM
Don't get too wrapped up in why it happened, just enjoy the fact that it did happen.
I love quality optics and have a lot of money invested in Zambuto and Russian mirrors, plus the finest American refracting lenses. But it's those nights when the jet stream leaves me alone that spending all that money is worthwhile.
Posted 28 September 2012 - 02:15 PM
this object with my Tak 102mm APO. Only on nights when the seeing plays ball, do I manage to spot it.
With my cheap as chips 150mm f/8 Chinese Achro (which cost me less than the 7x50 Tak finder) I always see both E and F.
It has to be really bad seeing for me not to pick-up F in my large Achro.
Posted 28 September 2012 - 02:45 PM
However, sometimes they are just not doable, reguardless of quality of the optics. Bill
Posted 28 September 2012 - 06:32 PM
Posted 29 September 2012 - 07:03 AM
Seeing is really a key. I've been trying to observe them with 60mm refractor for some time. A-E was not so difficult but F isn't easy with small aperture.
I was able to see them this morning for the first time. Seeing was excellent this morning 4am PDT. Unfortunately we have high thin clouds. Waiting for half an hour, view got steady momentarily and I was able to see 6 stars
I hope coming few day, warm weather clears early morning fogs (marine layers) to reconfirm the observation with larger scope side-by-side.
Setup was Takahashi FS-60Q + 1.6x extender (f/16, 960mm), prism diagonal and Leica Zoom eyepiece at 8.8mm, yielding about 110x.
Posted 29 September 2012 - 10:55 PM
60mm. Impressive. And congratulations!
Ha ha, not yet congrats I saw them for less than 10 seconds. But the way E is seen, I am hopeful to catch F under better condition with 60mm scope.
It is different kind of fun to challenge well known same target again and again with more challenging setup. I enjoy that very much.
Even Polaris is fun when you look at the double at low power, 15x, 16x. It is quite a challenge and good indicator of eye condition, at least to me
Posted 30 September 2012 - 07:59 AM
60mm might do it, but with a little more magnification. I consistently saw both E and F in my 70mm f/8 fluorite at 140x.
Posted 06 October 2012 - 11:39 AM
Posted 06 October 2012 - 01:01 PM
Posted 29 November 2012 - 06:12 PM
Posted 01 December 2012 - 05:08 PM
Posted 03 December 2012 - 11:50 PM
Even in very good seeing applying the right magnification(s) is key, especially with smaller instruments. Too low power won't show 'em, too high power and they're gone. Some years ago I saw both E and F with a 4"F10 achromat in very, very good seeing but only at 80 and 100x (12.5mm and 10mm eyepieces). F actually "felt" a good deal closer to C than its actual distance would indicate.
This has been my recent experience. I find that 135x seems to be perfect. I'm thinking that times in the past where I had trouble seeing E & F I was at too high of a magnification.
Posted 04 December 2012 - 10:33 AM
Posted 09 December 2012 - 09:46 PM
Posted 05 January 2013 - 04:34 AM
Tonight I was outside and thought I MAYBE saw F, but it could have been my imagination.
But I saw several beautiful doubles tonight, especially Theta Aurigae and the perpetually cool CASTOR.
Posted 01 March 2013 - 07:31 PM
Had to use a green filter on the pup
Posted 01 March 2013 - 08:55 PM
I found the f star last night for the first time with my 6" f8 achro and a Pentax XW 7mm. Jumping for joy as I also got the 'pup' for the first time with a 5mm XW
Had to use a green filter on the pup
Posted 02 March 2013 - 05:25 PM
Posted 04 March 2013 - 04:04 AM
... A-E was not so difficult but F isn't easy with small aperture...Tammy
If the current WDS data is correct, then the C-F pair has as separation of 4.5" with magnitudes +5.06/11.5mag - this is certainly a double very hard to split with an aperture below 150mm even under perfect conditions means ignoring the fact that there is also a nebula to consider.
Is +11.5mag not already at the telescope magnitude limit of a 60mm scope?
Posted 04 March 2013 - 04:06 PM