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Bortle scale for those with observatories?

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45 replies to this topic

#1 Aquarist

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Posted 17 November 2012 - 12:17 PM

Just a quick survey of the Bortle scale for those folks with observatories. Response would be greatly appreciated. Thanks in advance.

#2 JAT Observatory

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Posted 17 November 2012 - 03:46 PM

Mine is a 6 (Eastern Pa 30 miles east of Phila)

#3 Aquarist

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Posted 17 November 2012 - 04:11 PM

Thanks! Hope I can get some more . . .

#4 tim53

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Posted 17 November 2012 - 04:30 PM

I had to look the scale up. I live 7 miles north of downtown LA, and I'm on a hilltop. I was surprised to realize that, based on the cutoffs in the scale, I must be between 7 and 8. I can't see the Milky Way, but I can easily find m31 when it's more than about 45 degrees up. I once took an image of the Crab when it was near the zenith, and got 15th mag stars in 5 minutes with my c 9.25"

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#5 powerstroke01

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Posted 17 November 2012 - 04:36 PM

3

#6 MRNUTTY

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Posted 17 November 2012 - 05:20 PM

I am currently building mine at home, in a yellow area. Luckily my parents' house is in a blue/grey area on the eastern shoreline. There is a platform on the roof rooftop (widows walk) big enough for a modest sized scope and box of EP's.

#7 Mary B

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Posted 17 November 2012 - 06:51 PM

Between a 2 and 3 depending on the streetlight in front of my house. It is going bad and goes off a lot. I haven't complained :lol:

#8 Aquarist

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Posted 17 November 2012 - 07:15 PM

Between a 2 and 3 depending on the streetlight in front of my house. It is going bad and goes off a lot. I haven't complained :lol:


I am jealous! Perhaps the streetlight needs an assist?

#9 thesungazer

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Posted 17 November 2012 - 08:04 PM

8 White at night

1 Black for solar :grin:

#10 Jeff in Austin

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Posted 17 November 2012 - 08:16 PM

8 on the Bortle scale for me, although It doesn't seem as bad as it could be.

#11 Tim Gilliland

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Posted 17 November 2012 - 09:49 PM

6 for me.

#12 vsteblina

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Posted 17 November 2012 - 09:56 PM

FIVE at my house.

30 minutes away at my vacation home it is typically a two. However, when low elevation fog covers eastern Washington it becomes magical.

#13 csa/montana

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Posted 17 November 2012 - 10:22 PM

I haven't converted mine to the Bortle scale, I use the SQM; and average 21.5.

#14 mattw

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Posted 18 November 2012 - 09:02 PM

An easy 2. Wish my seeing was better though.

#15 dmdouglass

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Posted 18 November 2012 - 09:21 PM

Hi Carol...

Here is a reference I use, which is from the CSC web pages.

Attached Files



#16 ShawnPreston

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Posted 18 November 2012 - 10:47 PM

About 5 for me

#17 raf1

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Posted 18 November 2012 - 10:56 PM

About 5 for me


Ditto

#18 BPO

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Posted 18 November 2012 - 11:45 PM

1.

#19 BKBrown

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Posted 19 November 2012 - 02:03 AM

About 7.5, I can see stars to about 4.3ish at zenith on average and sometimes a bit better after midnight when local lighting levels throttle back...

Clear Skies,
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#20 Starman27

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Posted 19 November 2012 - 02:45 AM

Using the CSC scale and chart the Illinois observatory is 5 and the Iowa observatory is a 4.

#21 dobsoscope

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Posted 19 November 2012 - 03:07 AM

5 for me too

#22 johne

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Posted 19 November 2012 - 06:51 AM

Its a 4 for me.

#23 csa/montana

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Posted 19 November 2012 - 11:18 AM

Hi Carol...

Here is a reference I use, which is from the CSC web pages.


From this then, I would be #4, sometimes #3, with the SQM.

#24 Aquarist

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Posted 19 November 2012 - 11:57 AM

Thanks everyone. We are a 7.

#25 Gastrol

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Posted 19 November 2012 - 12:07 PM

I would guess about 7.
But when the Dodgers are playing, a 9.


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