Observation by Martin Lewis: Mars 23rd Jan 2020

Uploaded by

Martin Lewis

Observer

Martin Lewis

Observed

2021 Jan 24 - 13:16

Uploaded

2021 Jan 24 - 13:19

Objects

Mars

Equipment

444mm Dobsonian
ASI224MC
L Astronomik filter

Location

St.Albans, UK

Target name

Mars

Title

Mars 23rd Jan 2020

About this image

Targetting weekly Mars imaging sessions. This one in very variable seeing last night and very frosty conditions with the sky at -33C and the ground at 0C so lots of local convection. Still, a couple of colour videos later on yielded some detail.

Martin

Files associated with this observation

M_2021-01-23_18-52_L_MLe.png (210.8 kB)

Like this image

Chris Dole, Martina McGovern, Davide Pistritto, Bill Leatherbarrow, Peter Mulligan, David Basey, Ron Arbour

Comments

Davide Pistritto, 2021 Jan 24 - 15:36 UTC

Even with local convections, the image reveals good details, thinking about angular diameter of Mars. Do you mean -33°C up in the sky? How do you know this measurement?

Martin Lewis, 2021 Jan 24 - 16:29 UTC

Hi David,

I use a gun type radiative thermometer. I regular record the sky temperature and ground temperature with it. It is usually 30C different. Occasionally the difference falls to 15 or 20C and I know that convective cooling will be much less of an issue.

Martin

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