[AZ-Observing] Re: Messier Marathon Site Horizon Profile
- From: "Gene A. Lucas" <geneluca@xxxxxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Wed, 15 Feb 2012 15:52:28 -0700
Nevermind..... I found the info on the SAC web pages, in the Messier
Marathon announcement:
Driving Directions to Messier Marathon observing site (Salome Emergency
Airfield site):
Hovatter Airstrip: Travel time about 2 hours. From Phoenix, go west on I-10
to Hovatter Rd at exit 53 or about 40 miles west of Palo Verde Nuclear Power
generating station.
Turn left over the freeway, drive over the canal. When you cross the canal,
turn hard left. Go 1.1 miles to a bend in the road. As the road veers to the SE,
look for a road running due south at the same point--- VINEGAROON ROAD. Take
it for 1.8 miles. You will come to a small left-right zig-zag, then see a chain
link fence
enclosing an area about 20 ft by 20 ft. Thatâ??s the airfield entrance.
N 33° 34' 50" W 113° 35' 53" Elevation: 1,378 ft.
Overhead photo of site and map:
http://saguaroastro.org/content/AAMM/hovatter_airstrip.jpg
THX Rick and Tom for the discussion...
Cheers,
Gene Lucas
"Inquiring Minds Wanna Know!!"
On 2/15/2012 15:27, Gene A. Lucas wrote:
> Hi Rick,
> "For the sake of ..."
>
> Would you give us the GPS coordinates you measured for the runway
> intersection?
> (Probably has been stated before on this list....) :>))
>
> THX for the details...
>
> Gene Lucas
>
> On 2/15/2012 10:15, saguaroastro@xxxxxxx wrote:
>> For the sake of completeness to the point of overkill, here is the
>> methodology I used.
>>
>> Please note no GPS units were used for these calculations :)
>> In Garmin MapSource Topo Software, I created a waypoint at the intersection
>> of the runways. I used the Measurement tool to drag a line from the
>> Observing site to the various peaks& saddles within 15 miles of the site.
>> I can then get the distance,& bearing from the site and the elevation of
>> the point.
>>
>> I entered this into a spreadsheet, calculated the Delta h between the two
>> point in on column, converted the distance from miles to feet in a second
>> column and did the 10th grade trig in the third.
>>
>> I had planned on using the data to create a horizon file for SkyMap pro, my
>> planetarium software of choice, but given the level of precision in SkyMap
>> is 1 degree, it seemed somewhat pointless.
>>
>> I do however have such a file for the Antennas Site, if anyone using SkyMap
>> is interested. Given the proximity of the hills to the Southeast& South
>> there, the horizon does come into play for low latitude objects.
>> Omegaï? Centauri barely scrapes over the top of the rise to the immediate
>> south from there.
>>
>> Rick
>>
>> ---- "David M. Douglass"<dmdouglass@xxxxxxxxxxxxxxx> wrote:
>>> Tom and Rick...
>>>
>>> Is it safe to assume that the Azimuth's are stated relative to TRUE NORTH
>>> and the Altitude is stated in Degrees ????
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