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General Astronomy >> Light Pollution

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gdd
scholastic sledgehammer


Reged: 11/23/05

Loc: N Seattle suburb, WA
Full moon LP at dark site new
      #5819038 - 04/24/13 01:32 AM

Does anyone know what the effect is of a full moon at dark site? It would be equivalent to what color of sky on the light pollution maps for a moonless night?

Thanks,

Gale


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Tony Flanders
Postmaster
*****

Reged: 05/18/06

Loc: Cambridge, MA, USA
Re: Full moon LP at dark site new [Re: gdd]
      #5819138 - 04/24/13 05:19 AM

Quote:

Does anyone know what the effect is of a full moon at dark site? It would be equivalent to what color of sky on the light pollution maps for a moonless night?




The short answer is that it's equivalent to the white zone. The longer answer is that it's quite different, because the Moon's glow is distributed over the sky in a way fundamentally different from artificial skyglow. That results from the fact that artificial light wells up from the horizon, while moonlight shines down from above.

See my blog How Brightly Shines the Moon?


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gdd
scholastic sledgehammer


Reged: 11/23/05

Loc: N Seattle suburb, WA
Re: Full moon LP at dark site new [Re: Tony Flanders]
      #5821109 - 04/24/13 11:51 PM

Hi Tony,

Thanks for the quick answer. That is quite bright.

Gale


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LivingNDixieModerator
TSP Chowhound
*****

Reged: 04/23/03

Loc: Trussville, AL
Re: Full moon LP at dark site [Re: gdd]
      #5826060 - 04/27/13 11:08 AM

I appreciate Tony's answer, but even if it is a Full Moon night, planets and double stars are still good targets if you want to get some scope time.

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Illinois
Carpal Tunnel


Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: Full moon LP at dark site new [Re: LivingNDixie]
      #5827835 - 04/28/13 07:41 AM

I go to dark sky on my vacation during no moon. I wondered, if the sky is gray zone and you mean that the full moon at night in gray zone turn to white zone?

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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Full moon LP at dark site new [Re: Tony Flanders]
      #5828588 - 04/28/13 03:15 PM

Very useful report Tony. LP from my London backyard obsy is severe to the point that late dusk just freezes and gets no darker. But I've a workaround via my cam in brief exposures which are stacked to go deeper ONCE the bright sky background is removed. The moon makes little difference to my imaging except for a few days around full moon when the skies are more polluted.

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audioaficionado
professor emeritus


Reged: 05/24/12

Loc: Medford, Orygun, USA
Re: Full moon LP at dark site new [Re: nytecam]
      #5834610 - 05/01/13 03:07 PM

I live in a orange/red zone and during the full moon, I couldn't even see Cassiopeia. No comet hunting that night.

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George N
Carpal Tunnel
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Reged: 05/19/06

Loc: Binghamton & Indian Lake NY
Re: Full moon LP at dark site new [Re: Illinois]
      #5848224 - 05/08/13 05:04 PM

Quote:

I go to dark sky on my vacation during no moon. I wondered, if the sky is gray zone and you mean that the full moon at night in gray zone turn to white zone?




One full-moon night in September, from my camp in the central Adirondacks (often 21.7 SQM reading on a dark night), I was surprised to be able to faintly make out the Cygnus Milky Way.


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gdd
scholastic sledgehammer


Reged: 11/23/05

Loc: N Seattle suburb, WA
Re: Full moon LP at dark site new [Re: George N]
      #5849744 - 05/09/13 10:43 AM

Quote:



Quote:
--------------------------------------------------------------------------------

I go to dark sky on my vacation during no moon. I wondered, if the sky is gray zone and you mean that the full moon at night in gray zone turn to white zone?


--------------------------------------------------------------------------------



One full-moon night in September, from my camp in the central Adirondacks (often 21.7 SQM reading on a dark night), I was surprised to be able to faintly make out the Cygnus Milky Way.





The full moon's position in the sky may make a difference.

Gale


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George N
Carpal Tunnel
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Reged: 05/19/06

Loc: Binghamton & Indian Lake NY
Re: Full moon LP at dark site new [Re: gdd]
      #5849840 - 05/09/13 11:26 AM

Quote:

Quote:



Quote:
--------------------------------------------------------------------------------

I go to dark sky on my vacation during no moon. I wondered, if the sky is gray zone and you mean that the full moon at night in gray zone turn to white zone?


--------------------------------------------------------------------------------



One full-moon night in September, from my camp in the central Adirondacks (often 21.7 SQM reading on a dark night), I was surprised to be able to faintly make out the Cygnus Milky Way.





The full moon's position in the sky may make a difference.

Gale




Yes in deed! With the observation I noted (September) the moon was just coming up, while the Milky Way was high overhead.


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Tony Flanders
Postmaster
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Reged: 05/18/06

Loc: Cambridge, MA, USA
Re: Full moon LP at dark site new [Re: George N]
      #5849928 - 05/09/13 12:25 PM

Quote:

One full-moon night in September, from my camp in the central Adirondacks (often 21.7 SQM reading on a dark night), I was surprised to be able to faintly make out the Cygnus Milky Way.




That doesn't surprise me at all.

For what it's worth, I can see the Cygnus Star Cloud (just barely) from my current favorite observing spot in Arlington, Massachusetts, deep inside the white zone.


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GlennLeDrew
Postmaster
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: Full moon LP at dark site new [Re: Tony Flanders]
      #5850846 - 05/09/13 08:05 PM

I find the Cygnus Milky Way is at the visibility threshold when the sky is at about 18 MPSAS, in the deep blue of twilight. Sky color may have a bearing.

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Tony Flanders
Postmaster
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Reged: 05/18/06

Loc: Cambridge, MA, USA
Re: Full moon LP at dark site new [Re: GlennLeDrew]
      #5851368 - 05/10/13 05:15 AM

Quote:

I find the Cygnus Milky Way is at the visibility threshold when the sky is at about 18 MPSAS, in the deep blue of twilight.




That precisely matches my experience in light-polluted skies. It's invisible from my local city park, SQM typically around 17.8. And visible from Arlington, SQM around 18.3.


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TCW
professor emeritus


Reged: 11/05/13

Re: Full moon LP at dark site new [Re: Tony Flanders]
      #6215382 - 11/25/13 03:08 PM

I am new to this topic. Can you explain SQM and how it is measured?

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richard7Moderator
Not Quite
*****

Reged: 11/02/07

Loc: Sacramento
Re: Full moon LP at dark site new [Re: TCW]
      #6215425 - 11/25/13 03:25 PM

Quote:

I am new to this topic. Can you explain SQM and how it is measured?




This should do it.


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