FreeLists / az-observing / [AZ-Observing] Re: Magnitude limit at Hovatter Antennas site

[Andrew Cooper <acooper@xxxxxxxxx>]

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
>
>
>--
>See message header for info on list archives or unsubscribing, and please 
>send personal replies to the author, not the list.
>
>
>
>  
>

-- 


Andrew Cooper
----------------------------------------------------
http://www.siowl.com



--
See message header for info on list archives or unsubscribing, and please 
send personal replies to the author, not the list.