[AZ-Observing] Sub-arcsec seeing on Anderson Mesa
- From: Brian Skiff <Brian.Skiff@xxxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Wed, 9 Mar 2005 20:47:06 -0700 (MST)
Len Bright has the image-motion monitor running again tonight:
http://www.lowell.edu/~lpb/NPOI/rt/seeingStats.html
...which is showing subarsecond seeing in the opening hour. I have
my Pronto out doing some casual viewing, and can confirm it is
near perfect in the 70mm aperture. I managed to just glimpse the
binarity of ADS 6263, the 0".9 pair just east of Procyon. Not resolved,
but I estiamted the position angle as 160, and now look up to see
that it is currently pa169. I also tried for theta Ori E, the 'fifth'
start in the Orion trapezium. At 150x I wouldn't give it any more
than a "definite maybe".
Poking around elsewhere: the group of clusters involving M46 and M47,
plus NGC 2423, Melotte 71, and Melotte 72, make a good series showing
the limits of a small telescope. M47 is a scattered cluster but with
lots of bright stars; M46 is rich but the stars are much fainter;
NGC 2423 is a typical winter Milky Way cluster with a brighter central
star and perhaps 15-20 stars resolved; Melotte 71 is clearly a rich
cluster but another step fainter, though a nice triangle on one side
sets it off; finally Meltte 72 is just too faint for this aperture,
though a reasonably bright fuzz is readily detectable.
\Brian
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