Orpington Astronomical Society

Astronomy => Alerts! Questions? Discussions... => Topic started by: The Thing on Nov 01, 2012, 18:53:52

Title: Photo Opportunity
Post by: The Thing on Nov 01, 2012, 18:53:52
The Moon passes very close (~1.5deg) to Jupiter at around midnight tonight.

Hopefully the air will clear in time for some good shots, it's a bit murky here in Beckenham at the moment :(
Title: Re: Photo Opportunity
Post by: JonH on Nov 01, 2012, 19:20:40
It is pretty muddy looking here too, but the forecast says it is going to clear around 9 and will remain so until the early hours.
I hope so anyway!
Title: Re: Photo Opportunity
Post by: Rick on Nov 01, 2012, 23:56:17
Clear view from London Bridge station this evening, and just now while I was walking home from Orpington station too. Bit blustery, though.
Title: Re: Photo Opportunity
Post by: MarkS on Nov 02, 2012, 01:03:43
Single shot by Canon 600d with Nikon 300mm lens on tripod.
1/400s at F/8  ISO400.

Cropped and scaled down by 1/3:

(http://www.markshelley.co.uk/Astronomy/2012/moonjupiter01112012.jpg)

Here is the moon full size from that same image:

(http://www.markshelley.co.uk/Astronomy/2012/moon01112012.jpg)

Here is Jupiter full size from that same image (but brightened by a factor of 4):

(http://www.markshelley.co.uk/Astronomy/2012/jupiter01112012.jpg)

I was amazed that the dark bands are just visible.

Mark






Title: Re: Photo Opportunity
Post by: MarkS on Nov 02, 2012, 08:05:10
BTW, this photo gives the opportunity to measure the relative surface brightness of Jupiter and the moon.  Jupiter is only 5 times dimmer than the moon but it would be 25x dimmer if it were made of the same material (since it is 5x further from the sun and there is a square law in operation).

I conclude that the moon surface is made out of out of some pretty unreflective stuff!

Mark
Title: Re: Photo Opportunity
Post by: Ivor on Nov 02, 2012, 08:34:12
I think you're right Mark, When I opened the fridge this morning I can confirm the cheddar in the fridge didn't reflect much light. As the weekend I shall buy a broader range of cheese so I can isolate the true composition.
Title: Re: Photo Opportunity
Post by: The Thing on Nov 02, 2012, 15:40:45
Quote from: MarkS on Nov 02, 2012, 08:05:10
BTW, this photo gives the opportunity to measure the relative surface brightness of Jupiter and the moon.  Jupiter is only 5 times dimmer than the moon but it would be 25x dimmer if it were made of the same material (since it is 5x further from the sun and there is a square law in operation).

I conclude that the moon surface is made out of out of some pretty unreflective stuff!

Mark
I believe the average albedo of the moon is only 9%, less than coal.
Title: Re: Photo Opportunity
Post by: MarkS on Nov 02, 2012, 22:36:14
Quote from: The Thing
I believe the average albedo of the moon is only 9%, less than coal.

Pretty dark!