Star gazing with light pollution

  • Context: Stargazing 
  • Thread starter Thread starter Radrook
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    Light Pollution Star
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Discussion Overview

The discussion revolves around the challenges of stargazing in areas affected by light pollution, particularly in urban settings. Participants share their experiences and techniques for observing celestial objects despite these conditions, touching on both visual and photographic methods.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants express frustration with light pollution limiting visibility of stars in their areas.
  • Others suggest that a decent telescope can help mitigate the effects of light pollution, particularly for viewing certain celestial objects.
  • A participant mentions a myth regarding the use of large telescopes in urban areas, claiming that they gather more light pollution than smaller scopes, which is challenged by referencing a specific guide.
  • One participant discusses the impact of light pollution on astrophotography, explaining that it can be compensated for in post-processing using software like Photoshop.
  • Another participant notes that temperature inversions in urban areas can lead to steady viewing conditions for planetary observations.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the effectiveness of different telescopes in light-polluted areas, as well as the validity of the myth regarding large telescopes. The discussion remains open with multiple viewpoints presented.

Contextual Notes

Limitations include varying definitions of light pollution's impact on different types of celestial observations and the effectiveness of various telescopes, which are not fully resolved in the discussion.

Radrook
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Guess this is for those who have a clear sky overhead. As it is the glare and pollution don't let more than a few stars shine through where I'm at.
 
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Where is that? Because I'm near Philadelphia and though the light pollution is pretty bad, a decent telescope will cut through it.
 


russ_watters said:
Where is that? Because I'm near Philadelphia and though the light pollution is pretty bad, a decent telescope will cut through it.


In the Harrisburg metropolitan area. I wasn't aware that a good telescope can cut through the glare and smog. How does it do that?
 


Radrook said:
In the Harrisburg metropolitan area. I wasn't aware that a good telescope can cut through the glare and smog. How does it do that?

City viewing of the Moon, Jupiter, and Saturn is quite good. Viewing of deep sky objects is affected by light pollution, but the size of the telescope can compensate partially. There is a(n) (untrue) myth that large telescopes shouldn't be used in the city because they gather more of the light pollution than smaller scopes. This myth is addressed on page 15 of The Urban Astronomer`s Guide by Rod Mollise,

http://books.google.ca/books?id=Z0m...&resnum=3&ved=0CBAQ6AEwAg#v=onepage&q&f=false.
 


I'm 24 miles from dead-center in Philadelphia and the population density is pretty high everywhere in SE PA - you can see what I have been able to do from my website. How far are you from Harrisburg?

I don't do much visual observing, so I can't say much about how galaxies look with your eyes through a scope, but the basic principle for photography is this: Light pollution brightens the entire image, including the object you are imaging. So using Photoshop, you can simply subtract this extra brightness from the image. It isn't perfect, but you can do a surprising amount of good photography from near a city.
 


You may surprised to learn that temperature inversions over cities can provide very steady viewing for planetary targets. Some of my steadiest views of Jupiter came from my suburban back yard.
 

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