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Observing mercury in daylight

Started by jabiru, 07/25/2008 09:25PM
Posted 07/25/2008 09:25PM Opening Post
One afternoon several years ago, at Astrofest, Roland Christenson showed me Mercury in his 10" Mak. It was about 4 p.m. and it was easily the best view of Mercury I'd ever had. It looked like a perfect little first quarter Moon, as seen in daytime. You could see markings. I've found most evening or morning Mercury viewing somewhat of a let down, mostly because of the atmospheric distortion at low altitude.

Now Roland's Mak is, well, an Astro-Physics marvel. But on a near cloudless, low humidity day a few weeks ago, having noticed that Mercury was transiting at 11:36 a.m. and about 45 deg, west of the Sun, I decided to have a go in my Lightbridge 12". I pointed the scope south and set it at the 70 degree altitude of Mercury at transit (using a Wixey angle gauge), and waited. Sure enough, right on schedule, Mercury moved smoothly into the field of view. It may not have been as perfect as what I saw through the Mak but it looked almost the same to me - a perfect "half Moon" although I can't say I saw markings.

I posted this on a couple of other forums but got no reaction. Maybe, those who follow this forum are more likely to have made similar observations.
Posted 07/25/2008 10:00PM | Edited 07/25/2008 10:01PM #1
I've often observed Venus during the day, but have not tried Mercury (at least that I recall wink ). I'll add it to my "to-do" list.

At WSP one year Roland Christen found Saturn during the day with his prototype 9.25" f/4.3 Fastmax (Maksutov-Newtonian). It was very ghostly, and would seem to fade from view from time to time, at least to my eyes.

Clear skies, Alan
Posted 07/25/2008 10:11PM #2
John: Interesting. Like Alan, I have observed Venus during the day but never Mercury. I do enjoy watching the phases of Mercury so the seeing is not so important...


As far as Mercury being 45 degrees west of the sun, somehow that seems quite extreme, I am thinking Mercury never gets more than about 20 degrees from the sun???

Jon