White Oak Observatory

BLOG Concerning Jim Bruton’s Practicing Amateur Astronomy Without a License

Notes from the cloudy state of Oregon, Part 1: What can a 71 mm refractor and a DSLR accomplish?

Bortle, Bortle, in the Sky

Headline: At ASV it’s more or less Bortle 2.3. At my house in Oregon it is about Bortle 4.5 And so what’s a Bortle? see: https://en.wikipedia.org/wiki/Bortle_scale

Here’s the site data I found to determine this.

Arizona Sky Village

“+” marks ASV. Tucson and Phoenix to the left. El Paso/Ciudad Juarez on the right. Indications are it is Bortle 2: look near the top for the small circle of Bortle 1 sky in the Gila National Wilderness.
Info from https://www.lightpollutionmap.info/ on my Arizona Sky Village site.
ASV light pollution data from https://lightpollutionmap.app/

Corvallis, Oregon

Corvallis, OR on the left, Albany, OR to the right. We’re just NW of Corvallis in that brown or olive zone.
Here’s the Oregon site data from https://www.lightpollutionmap.info/
And here it is according to https://lightpollutionmap.app/

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