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Thread: Help Identify My Bortle!

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    Question Help Identify My Bortle!



    Hi all

    The light pollution map is putting my location in Australia in a red zone, and I'm not sure which Bortle that is, so I'm wondering if anyone with experience can help me figure it out. On a clear, moonless night, I can easily see M7, Ptolemy's cluster as a small hazy patch near Scorpius, and the milky way reveals itself to me as a very dim patch of a slightly higher brightness than the rest of the sky around Sagittarius. If I am well dark adapted on a good night, sometimes I can see to around mag 5.5, but that is a rare occasion. I can also see Omega Centauri and sometimes 47 Tuc naked eye. I remember ONCE, I was out in the backyard and my eyes seemed to be noticing the Lagoon Nebula as an EXTREMELY dim patch near Saturn, though that could've been my brain pretending to see it, and that is probably the case, though it was at the zenith. Any idea what my LP is like?

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    Default Re: Help Identify My Bortle!

    The Bortle Scale is rather subjective, and also greatly depends on current sky conditions, which can change minute by minute. Based on your description, I'd put you at Bortle 5-6, which isn't that good, but still better than my back yard, which is usually about Bortle 7-8. On average, I can see a hint of the Milky Way about once a year, and my average naked eye limit is about 4.5.

    My light pollution is highly localized. I only live a few blocks away from some baseball diamonds which are ALWAYS lit up at night, whether or not anyone is playing a game. I live on the south end of a college town, so my northern sky is washed out almost completely. My best view is currently toward the south (which is great), but they are building a new car dealership directly south of me about a mile away, so I'm sure even that view will be taken from me soon. However, there are places about 15-20 minutes from home that I can drive to and get down to Bortle 3-4.

    To me, the Bortle Scale is just a general guideline of current local conditions. If you want to get exact about it, there are instruments available that will measure your current skyglow in a given part of the sky. But for my purposes, just writing that my sky conditions are "blech, blah, ok, or woohoo!" are good enough.
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    Default Re: Help Identify My Bortle!

    Thanks! My current estimates based on websites and descriptors put me at around a bortle 6-7

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    Default Re: Help Identify My Bortle!

    The light pollution map sometimes has indicators from SQM readings. I see someone did it for a red zone in Perth

    https://www.lightpollutionmap.info/#...rs=B0FFFTFFFFT
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