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Some people may already know about this site but for those that don't (which included me half an hour ago) I can highly recommend it.
I asked someone how they were able to identify which moon was which in their eyepiece and they pointed me to this site. You can select any time / date you wish so that you can plan your observing if you want to see a particular transit or moon's shadow.
(Jupiter's moons page at bottom left of the page linked to)
Sunday 24th May, from 7:30pm BST, 200p F/5, EQ3-2, diy Onstep Goto.
I've enjoyed watching Venus wane to a thinner & thinner crescent recently, but have never observed Mercury. Having the 2 planets & the Moon only a few degrees apart this week was an opportunity not to be missed. But the gap between the trees & the hill to my West is only about 1 "fist" wide - maybe 40 minutes of observing time. And the late sunset time means Venus would have moved behind the hill before becoming naked-eye visible.
I don't have a permanent setup & can't see Polaris from my patio so I observe from a very rough "polar alignment" & have marked the tripod leg positions on the patio so I don't need to Polar, or Star align every session.
So, having made sure to "Park" the scope at the end of the previous night's session I could just plonk the setup on the marks, "Unpark", "Goto Venus" & lo and behold a tiny crescent Venus appeared about 1 degree from the centre of the the 9x50 Finder in a sky that was clear of cloud but still pure white from the solar glow ! Isn't Goto wonderful ?
Venus was such a beautiful thin 4% crescent with "horns" stretching to the meridian. At first it was shimmering but that must have been a heat plume because a tiny tweak of the focus steadied the image. The seeing was surprisingly good for the low altitude. I enjoyed the view at up to X250 (4mm TMB), before a Goto to Mercury.
Mercury was not visible in the Finder but was a tiny dot in the 32mm Plossl. At higher powers I saw it as a 45% crescent. I know it was about 62% illuminated so the sky must have been too bright for me to see its full extent. I don't claim to have seen any detail - the brightness just reduced steadily from the limb towards the terminator.
I still couldn't see the Moon naked eye so did another Goto & looked in the Finder. Nothing ! But the bright sky must have been fooling my eye because when I forced myself to focus at infinity it popped in sight. The visible crescent was about half the thickness of a crosshair ! In a 20mm Plossl I could see about 6 medium sized faint, ghostly craters along the limb of a 4% crescent.
So in about half an hour I had my first sight of Mercury, & seen my thinnest crescents of Venus & Luna. Isn't this hobby fantastic ? 😀
Hi, i just wanna mention that i have started a youtube channel a couple of months ago.
My main focus is to explain how all gear works, collimation, all kind of software that I use etc.
Feel free to take a look and i am more than eager to listen to what i can do better to improve my videos, and also tips on what to cover in the upcoming videos