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Messages posted by: wildcard
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Attached is a one page PDF document that had been uploaded by user "obsessionowner" on the Argo Navis Yahoo Group entitled
"How to Center the Encoder Bracket on the mirror box" by Charlie Starks and Jean-Paul Richard.
Astronomical Society of South Africa wrote:
For two decades, starting in the late 1960’s, the southern sky was patrolled by a dedicated South African comet-hunter named Jack Bennett. In addition to discovering comets with his 5-inch low-power refractor, Bennett also noticed many deep-sky objects that looked like comets. His list of comet-like southern deep-sky objects – shades of Messier – forms the basis for the Bennett Catalogue.
Wikipedia wrote:
The Caldwell catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier catalogue.

While the Messier catalogue is used by amateur astronomers as a list of deep-sky objects for observation, Moore noted that Messier's list was not compiled for that purpose and excluded many of the sky's brightest deep-sky objects, such as the Hyades, the Double Cluster (NGC 869 and NGC 884), and the Sculptor Galaxy (NGC 253). The Messier catalogue was actually compiled as a list of known objects that might be confused with comets. Moore also observed that since Messier compiled his list from observations in Paris, it did not include bright deep-sky objects visible in the Southern Hemisphere, such as Omega Centauri, Centaurus A, the Jewel Box, and 47 Tucanae. Moore compiled a list of 109 objects to match the commonly accepted number of Messier objects (he excluded M110), and the list was published in Sky & Telescope in December 1995.

Moore used his other surname – Caldwell – to name the list, since the initial of "Moore" is already used for the Messier catalogue. Entries in the catalogue are designated with a "C" and the catalogue number (1 to 109).

Unlike objects in the Messier catalogue, which are listed roughly in the order of discovery by Messier and his colleagues, the Caldwell catalogue is ordered by declination, with C1 being the most northerly and C109 being the most southerly, although two objects (NGC 4244 and the Hyades) are listed out of sequence. Other errors in the original list have since been corrected: it incorrectly identified the S Norma Cluster (NGC 6087) as NGC 6067 and incorrectly labelled the Lambda Centauri Cluster (IC 2944) as the Gamma Centauri Cluster.
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The Perek-Kohoutek Catalogue of Planetary Nebulae
The MASH Catalog of Planetary Nebulae
The Macquarie/AAO/Strasbourg Hα Planetary Galactic Catalog (MASH) contains 905 true, likely and possible new galactic planetary nebulae discovered in the AAO/UKST Hα survey of the Southern galactic plane. The MASH catalog represents the result of a 7-year programme of identification and confirmatory spectroscopy. A key strength is that the entire sample has been derived from the same, uniform observational data. The 60% increase in known Galactic planetary nebulae represented the largest ever incremental sample of such discoveries.

"The past, present and future of Galactic planetary nebula surveys" by Parker, Frew, Acker, Miszalski

The MASH Catalog is presented here divided into three Argo Navis User Catalog text files.
* mash_true.txt - True Planetary Nebulae from the MASH Catalog
* mash_likely.txt - Likely Planetary Nebulae from the MASH Catalog
* mash_possible.txt - Possible Planetary Nebulae from the MASH Catalog
Thank you to Al Lamperti from the eastern United States who compiled this composite observing list
of Carbon stars, Flat Galaxies, Quasars, Lensed quasars, Double quasars, Hickson Galaxy Groups, Abell, BL objects, Arp peculiar galaxies.

Wikipedia wrote:
The Local Group is the galaxy group that includes the Milky Way.

Wikipedia page :- https://en.wikipedia.org/wiki/Local_Group

Bill Ferris kindly compiled this Argo Navis User Catalog of Local Group Galaxies.
Wikipedia wrote:
A carbon star is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen. The two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds, giving the star a "sooty" atmosphere and a strikingly ruby red appearance. There are also some dwarf and supergiant carbon stars, with the more common giant stars sometimes being called classical carbon stars to distinguish them.

In most stars (such as the Sun), the atmosphere is richer in oxygen than carbon. Ordinary stars not exhibiting the characteristics of carbon stars but cool enough to form carbon monoxide are therefore called oxygen-rich stars.

Carbon stars have quite distinctive spectral characteristics, and they were first recognized by their spectra by Angelo Secchi in the 1860s, a pioneering time in astronomical spectroscopy.

Special thanks to highly experienced U.S. observer Bob Rose, an OzSky regular, who compiled the following carbon star files :-

Carbon+Var225.txt consisting of 225 Carbon Stars Down to Mag 10- Listed by Var Star Id

Carbon437.txt consisting of 437 Carbon stars down to mag 10 Using CGCS ID

Carbon-Argo.txt consisting of 75 fairly bright carbon stars.

wikipedia wrote:
The Herschel 400 catalogue is a subset of William Herschel's original Catalogue of Nebulae and Clusters of Stars, selected by Brenda F. Guzman (Branchett), Lydel Guzman, Paul Jones, James Morrison, Peggy Taylor and Sara Saey of the Ancient City Astronomy Club in St. Augustine, Florida, United States c. 1980. They decided to generate the list after reading a letter published in Sky & Telescope by James Mullaney of Pittsburgh, Pennsylvania, USA.

In this letter Mr. Mullaney suggested that William Herschel's original catalogue of 2,500 objects would be an excellent basis for deep sky object selection for amateur astronomers looking for a challenge after completing the Messier Catalogue.

The Herschel 400 is a subset of John Herschel's General Catalogue of Nebulae and Clusters published in 1864 of 5,000 objects, and hence also of the New General Catalogue.

The catalogue forms the basis of the Astronomical League's Herschel 400 club. In 1997, another subset of 400 Herschel objects was selected by the Rose City Astronomers of Portland, Oregon as the Herschel II list, which forms the basis of the Astronomical League's Herschel II Program.

Wikipedia description page :-

Special thanks to Australian observer and dedicated supernova searcher, Peter Marples, for compiling the Herschel 400 into Argo Navis User Catalog format.
Andrew Hincks created the ArgoUserListCreator to enable the creation of Argo Navis User Catalogs in an Excel spreadsheet
and for them to be exported in the requisite Argo Navis User Catalog format which uses 'vertical bar' - also known as pipe - delimiters (|)

The use of the utility is described in a four page User Manual.

Special thanks to Andrew for creating this utility.
What is the BAM600?
The BAM600 is a list of 600 observing targets for the Southern Hemisphere, covering all different types of targets and catering to various telescope apertures and observer experience.

How did it come about?
John Bambury is one of the core volunteers for the Three Rivers Foundation in Australia who do a lot of outreach astronomy. In addition to this 3RF regularly host small and large groups of observers from the US to Australia with a bi-annual astronomy tour called OzSky.

John's role with 3RF is “Observations Officer”. As most of the US visitors have a very short observing time down here (8 days per trip), he decided it would be beneficial to them if he put a comprehensive observing list together. John said he wanted to do something similar to the Herschel 400 for Southern Hemisphere observers and for the US visitors who came down to Australia.

John put the list together himself by incorporating several of the known common lists ( eg. Messier, Caldwell, etc), and then including a lot of targets he had observed himself over many years and by consulting with some of his observing colleagues on some of their favourite targets in each target category, which were “not” part of the common lists.

In 2009 the Astronomical League added the BAM600 target list as a “supplementary list” to their Southern Skies Telescope Club Observing Badge List.

The Files
The list is attached as an excel spreadsheet with targets sorted in Right Ascension (RA) order. You can re sort the list to suit your own observing goals.
BAM600_-_John_Bambury_Southern_Skies_Observing_List.zip 75.22 KB
The BAM600 list. Unzip the file and open in Excel.

BAM600_Southern_Skies_List_in_AN_format.txt 61.16 KB
The BAM600 list as a text delimited file for uploading as a User Defined Catalogue to the Argo Navis DTC.

BAM600-skytools.zip 9.85 KB
The BAM600 list as a SkyTools file for uploading into SkyTools.

How to Use The List
John says you can observe the list in whatever way suits you to fit in with your available observing time. Most people will take a couple of years to work through the list.

A good way to start off might be to sort the list and allocate targets to each “planned” observing night based on “best month to observe”, setting your observing program for each night to observe targets rising towards the zenith from the East.

By doing it this way you will always have the targets on your program for the night well placed and you should be able to work through them all systematically.

Definitions and Abbreviations
BN = Bright Nebula
CS = Carbon Star
DN = Dark Nebula
EG GC = Extra Galactic Globular Cluster
EN = Emission NebulaGal = Galaxy
Gal CL = Galaxy Cluster
GC = Globular Cluster
MS = Multiple Star
OC = Open Cluster
PN = Planetary Nebula
SR = Supernova Remnant
Star = Star
VS = Variable Star
Matt Bielski wrote:Thank you Gary for all the hard work and the quick response in getting this site up

Hi Matt,

Thank you and welcome to the Group!

We look forward to seeing you down here at OzSky 2020! smilie
Last month, John Izzo reported on his recently finished equatorial platform project.

He wrote :-

John Izzo wrote:
Hi All,

I just like to report that I recently finished an equatorial platform for my home-made 16" truss dobsonian, with the help of Mark Justice and Rod Brackenridge fellow members of the Astronomical Society of Victoria (Instrument Making Section). Last week, I used the first time the Argo Navis in conjunction with the platform. Following the AN manual instruction it worked like a charm. I was ready for all sort of trouble but it worked perfectly from the start. I'm very happy. Now for the weather...



John Izzo
Stella Observatory
Macedon, Victoria
144:34:13 E - 37:25:09 S

It was so good to see that it is worth posting again including with attached photos.
Attached is Scott Tannehill's PowerPoint presentation on the method he used for locating the alt axis on a Dobsonian.
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