[sac-forum] Re: Saddle Mt tonight

I was planning on coming out. If others were coming out too. 
 
Dwight
 
 
 
In a message dated 4/18/2009 11:47:29 A.M. US Mountain Standard Time,  
rvorbeck@xxxxxxx writes:

 
Is anyone going to Saddle Mountain tonight? I would like to know if  anyone 
else is going in order to make plans on being out there.
 
Ray

----- Original Message ----- 
From: _AJ Crayon_ (mailto:acrayon@xxxxxxx)  
To: _SAC Forum_ (mailto:sac-forum@xxxxxxxxxxxxx)  ; _AZ Observing_ 
(mailto:AZ-Observing@xxxxxxxxxxxxx)  
Sent: Saturday, April 18, 2009 8:34  AM
Subject: [sac-forum] Saddle Mt  tonight


Anyone going to Saddle Mt, or anywhere else  dark enough to use a 
telescope, here's a suggested observing list ripped  straight from the SAC 
Newsletter.  And don't forget, if you observe  them, send results to me for 
inclusion 
into the newsletter.
 
 
Time  for a second trip through Lynx and the star of galaxy season.  The 
selections will include a number  of barred spirals and, if the galaxy appears 
elongated it should be the  bar.  We start near 27 Lyncis to  find the 
barred spiral NGC2500, which has a bright nucleus in the  bar.  Moving to the 
southeast is  NGC2537, the Bear Paw or Bear Claw Galaxy with asymmetrical 
spiral  arms.  Now going a little to the  north is NGC2541 another barred 
spiral.  The next galaxy, NGC2683, is  in the 110 Best NGC and Herschel 400 
lists. 
 Look for some mottling on the  northwest side.  Continue the  eastward 
trek to NGC2770 sometimes referenced as  NGC2770A.  It is a rather  small late 
type spiral and faintest on this list.  Finally, the eastern most, is  
NGC2776 an almost face-on barred spiral.  The bar may not be easily seen yet  
the 
bright nucleus should be easier to detect. 
We  will now begin a two month observing session to better understand the  
Hubble sequence of galaxies.   Unfortunately, because of space limitations, 
we will not be able to  cover them exhaustively, nor will we be able to 
discuss their many  nuances.  Yet there will be  enough to give the observer 
and 
idea how the sequence relates to each  other.  The basic sequence  starts 
off like a tuning fork with ellipticals on the horizontal part;  spirals such 
as Sa, Sb and Sc on the upper part and barred spirals like SBa,  SBb and 
SBc on the lower part.   The ellipticals are smooth featureless structures and 
are shaped  anywhere from round to elliptical, with some brightness changes 
towards the  middle.  Spirals are flattened  disk with stars forming 
arm-like structures from a brighter central  bulge.  The barred spirals are  
like 
spirals but have a bar like structure emanating from the central  bulge.  
Its brightness normally  falls between central bulge and arms.   Please keep 
in mind galaxies don't easily follow these divisions  nicely as some are 
difficult to categorize because they could be assigned to  more then one class, 
which leads to more classes and subdivisions.  Selection criteria for our 
galaxy  study is based on orientation and magnitudes that are within reach of 
SAC  scopes.  Ignore non-referenced  field galaxies.    
So,  with the above introduction here are the next two month's worth of  
observations.  For June we begin  with the E1 M105 in Leo then E7 NGC3384 aka 
NGC3371 in  Leo both in same field of view but ignore NGC3373.  For spirals 
start with the Sa  NGC4429 in Virgo then the Sb NGC2985 in Ursa Major and 
finally  the Sc M99 in Coma Berenices.   For July begin with the E1 M84 and E3 
M86 both in Leo  and in same field of view next is E4 M49 in Virgo.  For 
the barred spirals begin with  the SBa NGC3227 in Leo then SBb M95 in Leo and 
SBc  NGC4535 in Virgo.  Now  which do you prefer, elliptical, spiral or 
barred spiral galaxies?  Personally I prefer spiral or barred  spirals. 
There  are a plethora of others, which also includes irregulars and dwarf 
along  with the many subdivisions.  For  more study see 
_http://en.wikipedia.org/wiki/Galaxy_morphological_classification_ 
(http://en.wikipedia.org/wiki/Galaxy_morphological_classification)   that 
covers lots more.  See also  
Luginbuhl and Skiff, Observing Handbook and Catalog of Deep-Sky  Objects; 
Kepple and Sanner, The Night Sky Observer's Guide and  Steinicke and Jakeil 
Galaxies and How to Observe  Them. 

I haven't checked the weather lately, has  anyone done so and what does it 
look like?

AJ Crayon
Phoenix,  AZ





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