[AZ-Observing] Re: Magnitude limit at Hovatter Antennas site
- From: Andrew Cooper <acooper@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Tue, 02 May 2006 20:01:18 -0700
I agree, I have tried to use the Polaris region, but too often the
northern part of the sky is in the light dome of some city. Not a
surprise when we head south of the cities (Tucson or Phoenix) towards
the border to get a good southern sky. This is very true at Vekol,
TIMPA and the Las Cienegas sites.
I too use a field near zenith. You just have to have some charts along
that have the needed info, the planetarium software package I use in my
palmtop computer can provide such at any time. I just pick a good
asterism near Zenith and try to find the dimmest star I can see. Then I
look it up on the Palm as it has some impact on my dark adaptation even
when red with a bit of red plastic in front.
Andrew
Brian Skiff wrote:
> For tests like these, I prefer to use seasonal fields rather than
>stars near the celestial pole. The pole is too low, and if you use
>stars (for instance) in Ursa Minor, then they are really only
>accessible up-high during spring.
> I have copied to the Lowell ftp area a list that goes from mag 4
>to mag 14 in the vicinity of the Coma galaxy cluster:
>
>ftp://ftp.lowell.edu/pub/bas/coma.seq
>
>I would try viewing this only when the field is within, say, 2 hours
>of the meridian (early evening these days).
> FOr the record, I can usually pick up the V=7.35 star in this list
>from Anderson Mesa without spending much time on it, though this is
>much fainter than Steve's "faintest star that I held steady", and on a
>few occasions have seen the V=7.94 star. At Sunglow Ranch one time,
>Bernie saw the V=7.97 star without knowing of its existence beforehand.
> The top of the list is copied below, but the complete list with
>some text is at the ftp area.
>
>\Brian
>
>
>
>Stars in the region of the Coma Galaxy Cluster
>
>Name alt name RA (2000) Dec V B-V spec Remarks
>HD 114710 beta Com 13 11 52 +27 52.7 4.25 0.57 G0V
>HD 113996 41 Com 13 07 11 +27 37.5 4.79 1.49 K5III
>HD 112989 37 Com 13 00 16 +30 47.1 4.90 1.16 G9III sl var
>HD 111812 31 Com 12 51 42 +27 32.4 4.94 0.67 G0III
>HD 111469 30 Com 12 49 17 +27 33.1 5.76 0.03 A2V
>HD 114092 13 07 54 +27 33.4 6.18 1.36 K4III
>HD 113865 13 06 10 +29 01.8 6.52 0.08 A3IV
>HD 112734 12 58 34 +28 19.2 6.95 0.23 A5
>HD 112887 12 59 33 +28 03.9 7.17 0.42 F4V
>HD 113493 13 03 49 +31 00.1 7.35 1.06 K0III
>HD 113284 13 02 21 +30 21.5 7.94 0.35 F1IV
>HD 112753 12 58 41 +27 28.4 7.97 0.65 G1V ADS 8721
>HD 112886 12 59 33 +28 14.3 8.16 0.44 F7V
>
>
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>
>
>
>
--
Andrew Cooper
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