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Bortle scale for those with observatories?

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#26 Tom Clark

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Posted 20 November 2012 - 02:44 PM

2

#27 Startraffic

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Posted 20 November 2012 - 05:17 PM

8-9
Clear Dark Skies
Startraffic
39.138274 -77.168898
Alt 518ft ASL

#28 Mr_T

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Posted 20 November 2012 - 08:40 PM

6 or 7 here

#29 JimPie

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Posted 21 November 2012 - 12:47 AM

Suburban Detroit solid white zone= 8

#30 Fish

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Posted 21 November 2012 - 06:55 PM

Good evening,

I'll give it a 4 at the home observatory (44-42-38, 69-46-59) but less than an hour away from 3 at a camp.

Regards, Marc

#31 Megabusa

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Posted 22 November 2012 - 07:22 PM

I think I'm about a 2- out of 8 , Being kinda on the outskirts of Town , Right on the Border of AZ & Utah , Page is a small Town Not much Light at Night :cool:

#32 Lonnie.H

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Posted 22 November 2012 - 09:16 PM

I'm a 4 at my observatory.

#33 David Johns

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Posted 23 November 2012 - 03:29 AM

Thanks 'DMDouglass' for posting the chart. My estimate is 2 to 3 (fairly often) at my home here in rural Queensland, with the very ocassional "OH, WOW" night...which I am guessing would be close to 1. Caveat, I am an optomist at heart....
Cheers
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#34 dobsoscope

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Posted 23 November 2012 - 04:40 AM

would be good to have a bar chart with these estimates

#35 Aquarist

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Posted 23 November 2012 - 09:49 AM

For those with a 6-7 or higher, what can you see and with what telescope? How badly does light pollution limit viewing?

#36 tim53

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Posted 23 November 2012 - 11:04 AM

From my yard just 7 miles north of downtown LA, I watched that asteroid (what was its name?) that zinged past us inside the moon's orbit a year or so ago, with my 10" f/6. I seem to recall it was 10th Magnitude or so. It was easy to spot, but hard to track, because there were so many similarly faint stars in the field, and I had to keep nudging the scope. My neighbor and I followed it for over an hour, which was difficult because it was easy to lose if I let it drift out of the field.

-Tim.

#37 tim53

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Posted 23 November 2012 - 11:14 AM

To make up for our urban location, our vacation home is in Milford, Utah, about 50 miles north of Cedar City and at 5000 ft elevation. We also have some farm land south of town that my wife uses for her field archaeology classes. I'm hoping to build an observatory on the site in the next couple years, and I've set up there many times.

There's really no noticeable light dome from Cedar City (yet), and Milford is 6 miles north and only has about 1500 people. Nearest traffic light even, is 30 miles away in Beaver (Butch Cassidy's home town).

Most of the times I set up at the site its late Spring or Summer, and the local farmers sometimes run their tractors over night, and their high beams are pretty bright, even if they're a mile or more away. So I'll often try to set up behind an obstruction (it's pretty flat out there!), or park the car between my scope and the road (a couple hundred feet away, at least).

So, it's probably a 2 there, and could easily be darker when the tractors are in the barns! I have seen the zodiacal light and the gegenshein from there, but I've never thought to check for Milky Way shadows.

-Tim.

#38 piaras

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Posted 24 November 2012 - 09:22 AM

At the observatory it is 4 most nights with once a year maybe near 3. At home in backyard 6-7.

#39 StarmanDan

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Posted 24 November 2012 - 03:08 PM

Around a 4 for me.

#40 mistyridge

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Posted 24 November 2012 - 06:55 PM

5, SQM 19.9 or Orange verging on yellow

#41 SleepIsWrong

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Posted 27 November 2012 - 12:33 PM

Four miles north of downtown baltimore - an 8.

#42 Aquarist

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Posted 27 November 2012 - 01:52 PM

Four miles north of downtown baltimore - an 8.


Are you able to observe much? What kind of telescope?

#43 microstar

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Posted 28 November 2012 - 01:04 AM

I'm probably a 4 or so.
...Keith

#44 RogerRZ

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Posted 28 November 2012 - 03:11 PM

I'm solidly in a 4 zone.

#45 wolfman_4_ever

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Posted 28 November 2012 - 05:41 PM

SQM 18, or 8 in the Bortle Scale . Can see a few objects with the naked eye, most objects are blobs visually through a scope.. Mallincam works great. I mostly image..

#46 avarakin

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Posted 05 December 2012 - 01:32 AM

8 here. Use the observatory mostly for narrowband imaging.

Alex






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