[AZ-Observing] Re: M57
- From: "Steve Coe" <stevecoe@xxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Thu, 7 Jun 2007 09:22:42 -0700
Stan;
Good to see that you are getting some good conditions, the central star =
of
the Ring is a pretty good test of the seeing and transparency. I only =
had
it "wink" at me for a second or two in any of the telescopes I have =
owned,
but in larger instruments it can be held steady. With Larry Mitchell's =
36
inch at TSP it was no problem to see the star and lots of nebulosity
associated with the Ring, both inside and outside the donut structure.
Have fun;
Steve Coe
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of =
billferris@xxxxxxx
Sent: Thursday, June 07, 2007 7:21 AM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: M57
Atmospheric seeing is another contributor. The central star is seen =
against
the subtle nebulosity filling the planetary's annulus. Typically,
magnifications of 350X or greater and good seeing are required to make =
the
detection. High magnification lowers the surface brightness of the
background=C2=A0nebulosity enough to allow the=C2=A0~15.2 magnitude =
central star to
emerge.=C2=A0If the seeing is soft, the star bloats and blends into the
background nebulostiy. But when the seeing steadies, the central star =
pops
into view. On nights when the central star is visible, nearby IC 1296 =
makes
a fine challenge for moderate to large aperture.
Bill in Flag
-----Original Message-----
From: Stan Gorodenski <stan_gorodenski@xxxxxxxxxxxxx>
To: AZ-Observing <az-observing@xxxxxxxxxxxxx>
Sent: Thu, 7 Jun 2007 12:15 am
Subject: [AZ-Observing] M57
Well, I am certain I have finally seen the central star in M57 with the=20
6", although I am sure seeing the central star is no big feat for all=20
ou experienced observers. I never saw it with the 12.5" Dall-Kirkham.=20
t pretty regularly pops in and out using averted vision. Sometimes it=20
eems very defined. I am wondering if this may be when it hits a more=20
ensitive rod in my eye, or because it is on the borderline of=20
isibility stochastically a times a rod gets hit with a few more photons.
tan
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