9/15 observing report
Session start 7:00 pm cst: Humidity 49%
Session end 10:00 pm cst: Humidity 83%
Goto Uranus 58mm E.D. FL 800mm
Eyepieces: All .965 Goto’s MH 25mm ,12.5, 6 and OR 9mm, 6, 4.
Accessories: Original Goto moon filter.
My goal last night was simply to try out the Goto Uranus type 4 on the moon, Jupiter and Saturn and see if the skies were conducive to a star test. The last week and a half has been very poor skies but I noticed the haze becoming less over the last two days. I started early because I knew the moon would be casting my shadow. On the plus side I didn’t need my red flashlight! I setup with the Sun still up but behind the hedgerow of trees. With the moon visible I started early and noticed immediately it could be a good night if everything held. With a southeast breeze (normally a good sign) I started with the HM 25mm. Good views and the atmospheric waves/tremors on the surface or the edge were minimal. Within 30 minutes dusk was in full swing and the contrast between shadow and light was starting to pop. My wife came out to try the new scope before the mosquitos found me and commented on the crispness of the craters. I decided to try the moon filter since it had been 50+ years since I tried one and as darkness fell the filter did wonders with the glare. Plus it was just cool to use. Continuing with Luna I scrolled through the eyepieces and decided it time to try the 4mm ortho and was pleasantly surprised at the detail. The image held up so well I knew it was a good night. At 200x while dim the detail was very good and steady. The CA was negligible on the circumference with all of the Goto eyepieces. I did have one eyepiece that needs cleaning and using them on the brighter areas of the moon brings out the culprits.
With the the brighter stars emerging I swung directly overhead to Vega for a sanity star test and decided ok time to chase some doubles before the moon became too bright. I moved to give Zeta Cygnus a go and noticed immediately pinpoint steadiness and a clear crisp diffraction ring. With the 12.5mm the ring was easily visible but no hint of the secondary. Moving to the 9mm ortho I intermittently could distinguish a difference on the ring to one side. Finally the 6mm (133x) Ortho and HM both brought out the beautiful ring and without question the secondary, to me a pale bluish hue, right on the diffraction ring. Knowing now where to look I moved back and forth between the 9mm and the 12.5 trying to catch a glimpse with no luck on the 12.5 but fleeting moments on the 9. Back to the 6mm I spent over 45 minutes watching this amazing pair and with no less than a 58mm and 70 year old glass. I know the .965 eyepieces get a bad rap but for me they are matched perfectly with this Goto for doubles. There is something about the glass in these eyepieces that just works on dim objects. Now the moon I noticed some ghosting on the lower power eyepieces but on dim doubles not a hint. The altitude and azimuth slow motion controls on this mount really work nicely and the steadiness of the brass mount just anchors the OTA to the legs. I noticed my best viewing of doubles is not directly on axis of this scope but halfway between center and the edge of the FOV. As Lyrae moved past the meridian it became easier to view so of course I wanted to double my fun with the double double. The 12.5mm (64x) split the wider of the two and enlongation of the second pair but It took the 9mm (88x) ortho to split both cleanly.
Of course I viewed our Gas giants and they were lovely but after Zeta Cygnus for me it was melodramatic. I thanked the night and using the moon as my flashlight I carried my 70 year new/old partner back to the porch for a well deserved rest.
Edited by PawPaw, 16 September 2021 - 01:35 PM.