[AZ-Observing] Re: Messier Marathon Site Horizon Profile
- From: "AJ Crayon" <acrayon@xxxxxxx>
- To: "AZ Observing" <AZ-Observing@xxxxxxxxxxxxx>
- Date: Thu, 16 Feb 2012 10:00:24 -0700
I have e-mail two folks from last year's AAMM asking questions about M30's
altitude at twilight. While neither found the globular they were in the
area trying to ferret it out. Will keep you posted if anything comes back.
BTW, the two are George Robinson and Jimmy Ray.
AJ Crayon
Phoenix, AZ
----- Original Message -----
From: "David M. Douglass" <dmdouglass@xxxxxxxxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Wednesday, February 15, 2012 9:08 AM
Subject: [AZ-Observing] Re: Messier Marathon Site Horizon Profile
Thanks Tom. And you too, Mr. GPS ( Rick Tejera ).
AJ is coming to the EVAC meeting to make a AAMM short presentation (not the
main speaker) this Friday.
I will see if I can take the information below, and create a circular chart
slide for AJ, and maybe a handout for the observers.
If I get it done, it might be a good addition to the "site information" on
the web site.
This issue seems to come up for every event out there.
David M. Douglass
david@xxxxxxxxxxxxxxx
Cell (602) 908-9092
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Tom Polakis
Sent: Wednesday, February 15, 2012 8:23 AM
To: AZ-Observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Messier Marathon Site Horizon Profile
While AJ Crayon was discussing the site of the upcoming Messier Marathon at
the last SAC meeting, I heard a voice come out of the crowd claim that the
mountains in the direction that M30 rises are 6 to 8 degrees tall. This
estimate sounded high by at least a factor of five, since a rise in 1000
feet would have to be less than two miles away to be reach 6 degrees. And
the airfield site is as flat as a pancake for miles to the east. Since I
didn't know the real value, I kept my mouth shut.
There had to be some measurements out there, and who better to know them
than Mister GPS himself, Rick Tejera? Several years back, Rick did a survey
of all of the high points along the local horizon at the Salome Emergency
Airfield site. He recorded elevations and distances and then did the trig
to put together the altitude vs. azimuth table below. Since M30 rises at an
azimuth of roughly 120 degrees, it looks like the elevation of the horizon
is 1 degree, at worst. This horizon will have no effect on the visibility
of M30 at dawn. Even with an ideal horizon, you'd never see M30 through
that first degree of desert horizon crud, anyway.
Tom
Azimuth Altitude
2 1.07
21 0.31
45 0.52
49 0.83
70 0.19
75 0.82
78 0.40
80 0.70
81 0.22
117 0.41
122 1.07
135 0.64
161 0.25
167 1.10
178 0.70
189 1.02
212 0.40
226 0.79
231 0.71
235 1.15
253 0.61
255 1.19
261 0.76
266 0.15
271 0.66
276 1.10
284 0.16
288 0.92
294 0.01
300 1.09
301 0.62
311 1.89
314 1.74
315 1.54
335 0.23
345 0.82
349 0.33
354 1.14
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