Observation Report 16-Sept-2016

This past Friday night was the 3rd Friday of the month, and supposed to be our Club’s public star party. The forecast was quite discouraging, and I was feeling a little tired, the week’s end and with the kids while my wife was at a Conference out of town. But I got the Orion SkyView Pro Mount extension in the mail, and the skies, though not pristine, were relatively clear nonetheless. Also, the kids wanted to head down to Tech Terrace Park, so I loaded up the Celestron 102GT 97mm clear aperture F/10.4 refractor and off we went.

We arrived about 9:15 or so, and I wasn’t set up and observing until 9:40. I set up on the sand gravel track, proper, due to all the dew on the grass. We grabbed Saturn early, already fairly low in the southwest. With the 11mm Nagler T6 at 92x, quite nice. A little shimmering due to its low angle, the shadow of the planet against the back right of the rings was just stunning. The Cassini division was evident, too. The girls REALLY liked Saturn. Nothing says visual astronomy like Saturn in a telescope!

Mars was actually pretty nice, given its present extraordinary distance. Has a rather gibbous shape now, but at least one polar cap was visible as well as either the other cap or some white clouds. A vague dark grayish tone to the otherwise amber orb denoted the mountainous highlands from the dominant auburn deserts.

I put Albireo in the eyepiece for a nice, dazzling duo, split even in the Celestron 32mm Omni plossl at 31.75x with an excellent wide field expression, but the color was more prominent in the 11mm T6 at higher power. After that, Maya wanted to look at the HUGE moon, just 10 hours after it went full, in the eyepiece. Believe it or not, there was a tiny bit of a terminator at the left edge, with the achromat providing a little greenish orange fringing at the terminator, but still quite nice. A beautiful, if utterly night vision destroying view. I had to wait a few seconds after that one.

A minute or two later, night vision restored, I tried to find M11, the Wild Duck Cluster. I found it, but gosh, with the full moon glaring the sky into gray from black, it wasn’t very inspiring. I decided I’d try and crack Delta Cygni, the close double that’s supposed to be a bear to split. Well, with the 32mm, it wasn’t split at all, so I decided to try my 6mm Baader Classic Ortho. I thought this eyepiece honestly did the best job, with the split apparent. I got an occasional split out of the 7mm TeleVue DeLite and 7mm Nagler T6, too, but the 6mm BCO was the cleanest of these for this target. 169x worked better than 145x. I had similar results with Epsilon Lyrae, the Double Double. Here, however, the T6 and DeLite 7mm’s more than held their own. The BCO 6mm was excellent, but so were the 7mm TeleVue offerings.

I decided to try out my new GSO Superview 42mm eyepiece. I’d just got it from Agena after selling my Hyperion 31mm. I was disappointed with the Hyperion’s performance in my f/7 ED refractor, and found it not very sharp over at least the outer 30% of the field. Well, the SV 42mm did NOT disappoint, at least not in this F/10.4 refractor. Now some might say this isn’t fair, and I can’t disagree that you can’t compare an eyepiece at f/7 and another at F/10 and pretend there’s not a huge advantage for the F/10 eyepiece trial, and I agree. But for the price of the Hyperion, I’d say it should have performed as well as the GSO SV 42mm did last night in my F/10 refractor. Stars were pinpoint in the SV 42mm at least through 90+% of the field. Yes, at the very edge there was a slight bit of distortion, but it was really quite minor. I’m not positive I can even use this eyepiece in my F/7 refractor, exit pupil wise (does my exit pupil open to 6mm at a dark sky site?), but for $70, I can live with that. It performs quite well at F/10.4, and I own one and can afford a “widest angle” 42mm eyepiece that works only in this scope for this price. Even if the Hyperion 31mm would have performed this well at F/10.4, it’s worth it to me to sell it and pick up the SV 42mm. And maybe it’d work okay at f/7? — assuming my exit pupil will expand to 6mm. Stay tuned to resolve this mystery.

I put the Superview on the bottom half of Lyrae, and I got at least a 2.31 degree view. Sulafat (Gamma) and Sheliak (Beta) were both easily in the field of view, with a tiny M57 Ring Nebula within it. There was quite a bit or room to spare above each, so this eyepiece certainly has an apparent field of view of at least 56 degrees, maybe more.

I put the washed out Andromeda Galaxy, M31, into the eyepiece after my Lyra trip, but it was as indistinct on this full moon night as one might expect. This had me put Eta Cassiopeia into my field of view, and the result was quite nice. The pair exhibits a nice color differentiation, and looked much nicer on this moon drenched evening than the lackluster galaxy. For my final double split, I put Almach into the eyepiece. This may become one of my favorite double stars, with a rather pleasant color difference between the pair.

My final target for the night was the Coathanger, Brocchi’s Cluster, more or less between Albireo and Altair in Vulpecula. It was a nice visual feast in the 32mm Omni Plossl. Still prefer this in a Newtonian, a little upside-down-ish in my refractor, but a nice target just the same. I put the telescope back in the car and we drove on home, tired, but having had a lot of fun under the stars.

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