Amateur astronomy equipment, techniques, info, etc

Archive for July, 2012

Decoding RC3 galaxy morphology classifications

I am working on an observing tour list for the showcase galaxies
associated with the Virgo supercluster by galaxy morphology.  I am
using the Third Reference Catalogue of Bright Galaxy (RC3)
classifications in the Simbad database in addition to the Hubble
tuning fork classifications.

Q1:  However, I am unable to find a decoder list for all the letter
codes used in the classifications.

Here is list of morphologies for my targets that are not apparent – in
particular the X and T codes:

RC3type Messier or Caldwell Id
.SAT3.. M088
.SAT4.. M063
.SBR3.. M095
.SBS6./ M108
.SBS7./ Caldwell032
.SBT3.. M091
.SBT4.. M109
.SXS2.. M098
.SXS3.. M066
.SXS4.. M100
.SXS4.. M106
.SXT1.. M065
.SXT2.. M090
.SXT2.. M096
.SXT3.. M058
.SXT4.. Caldwell029
.SXT4.. M061
.SXT6.. M101
RLAT+.. Caldwell040
RSAR2.. M094
RSAT2.. M064

Q2:  I am unable to find a consisent coding definition for the
trailing numbers.

A wikipedia page seems to indicate that the trailing number represents
the inclination of the galaxy, with "0" being face-on and "6" being
edge on.

http://en.wikipedia.org/wiki/Galaxy_morphological_classification

But this does not match with RC3 values for many Messier objects, e.g.

   M101 is .SXT6.. but is clearly a face-on, not an edge on galaxy.
   NGC4244 Caldwell 26 is .SAS6*/ but is slightly inclined and not an
edge-on galaxy.

My local university library does not have a copy of the Third
Catalogue of Bright Galaxies.  I have found an online Latex encoded
copy at one of the author’s website, url:

http://spider.ipac.caltech.edu/staff/hgcjr/

- but this would require Latex decoding and the gz uncompress on my
Windows box breaks when tried on the download file.

Q3:  Does anyone know of an online source in pdf or html that lists
the codes used in RC3 galaxy morphology or perhaps a treatise book and
page reference?

Thanks for any help and referrals.

Clear Skies – Kurt

.
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Tour of the spring galaxies by galaxy morphology

I have prepared a table that sorts showcase galaxies associated with
the Virgo Supercluster and visible during the spring by:

1) Galaxy type (RC3 codes), and a subsort on,
2) Apparent brightness.

Virgo Supercluster Showcase Galaxies by Type
http://fisherka.csolutionshosting.net/astronote/plan/VirgoSCGalaxyTou…

The table includes galaxy morphology by Third Reference Catalogue
(RCS3) types,  Hubble tuning fork types, and by Simbad object types.

Notes at the bottom of the table link to an explanation of the codes
used by the RCS3 classification.

Use it in good health.  Corrections and comments are welcomed.

Clear Skies – Canopus56

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How did folks fare with the recent Meteor Shower?

I missed it, in fact I wasn’t paying enough attention prior to and
found out about the ‘peak’, after it had passed.

berk

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More variable star targets

I have some more variable star targets for people to play around with
in any way they want.
I have been quite shocked how many I have found in my archives so I
hope somebody will find them of interest.

http://www.martin-nicholson.info/freegratis/freegratis.htm

Martin Nicholson – Daventry, England

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The 42-meter-wide European Extremely Large Telescope (E-ELT), will be built on Cerro Armazones

Chile Wins Battle to Host Mega-Telescope
The European Southern Observatory (ESO) officially announced yesterday
that its next mammoth optical telescope, the 42-meter-wide European
Extremely Large Telescope (E-ELT), will be built on Cerro Armazones, a
mountain…

http://news.sciencemag.org/scienceinsider/2010/04/chile-wins-battle-t…

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Back to Astromart–Limited Search for Past Ads?

Well, it seems as though I’ve gotten past the problems I reported above
some week or more ago. I think I came across another surprise today
though. One can only search back 90 days for a particular item. Is that
new? I thought I recalled that one could search back years.

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New mugshot

One of everybody’s favorites has joined the lineup at "Mugshots of
sci.astro.amateur Denizens."  Peek at him here:
http://www.theastropost.com/smf/index.php?topic=984.msg2174#msg2174


Martin R. Howell

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