Roger Samworth

Sun report 03/07/2018

Some filaments and nice prominences today.

As explained in a recent email dialogue,

The Lunt LS35 is tilt tuned and you can alter the emphasis twixt surface features and prominences by adjusting the (un-calibrated) tuning wheel. This is true for visual use at least. I seldom do this, and when imaging it isn’t that sensitive as you can compensate with processing, as I showed at RAG on friday night. I don’t change it between the surface and prominence images. I seem to get results generally very similar to those on GONG, which is my yardstick. Mind you, with published Ha images, you often see “hair” around spots, but you NEVER see this on GONG, nor do I get it.

Prepare for Mars!

Mars’s rotation period is about 24 hours 40 minutes.

This means that if you observe at the same time each day, the surface moves around 10 degrees (backwards). So to see a complete rotation, it takes around 36 days.

If you observe continuously the surface moves around 15 degrees per hour forwards.

Telescopically, the most prominent feature on Mars is Syrtis Major. In previous apparitions, timing and the weather contrived to prevent me seeing it.

At about 01:30AM NOW, it is almost facing us!

Get out there!

Saturn 28-29/06/2018

Here are the images of Saturn and its moons from 28-29/06 using the 8″SCT They aren’t that much better than the ones through the double glazing that I posted the other day, indicating that it is the seeing and the planet’s low elevation that is the controlling factor.

Just compare it with the last image that I took with the same scope and the Toucam in 2007 when Saturn was much higher!