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Messages posted by: wildcard
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This list of 130 objects (120 Deep Sky and 10 Double Stars) was created by the members of the Westminster (Mayland) Astronomical Society and original uploaded
by Yahoo Group member czar_seven.
Australian super-nova hunter, Peter Marples, created this Argo Navis User Catalog of 1104 galaxies with ESO designations
Wikipedia wrote:
The Atlas of Peculiar Galaxies is a catalog of peculiar galaxies produced by Halton Arp in 1966. A total of 338 galaxies are presented in the atlas, which was originally published in 1966 by the California Institute of Technology. The primary goal of the catalog was to present photographs of examples of the different kinds of peculiar structures found among galaxies.

Arp realized that the reason why galaxies formed into spiral or elliptical shapes was not well understood. He perceived peculiar galaxies as small "experiments" that astronomers could use to understand the physical processes that distort spiral or elliptical galaxies. With this atlas, astronomers had a sample of peculiar galaxies that they could study in more detail. The atlas does not present a complete overview of every peculiar galaxy in the sky but instead provides examples of the different phenomena as observed in nearby galaxies.

Because little was known at the time of publication about the physical processes that caused the different shapes, the galaxies in the atlas are sorted based on their appearance. Objects 1–101 are individual peculiar spiral galaxies or spiral galaxies that apparently have small companions. Objects 102–145 are elliptical and elliptical-like galaxies. Individual or groups of galaxies with neither elliptical nor spiral shapes are listed as objects 146–268. Objects 269–327 are double galaxies. Finally, objects that simply do not fit into any of the above categories are listed as objects 332–338. Most objects are best known by their other designations, but a few galaxies are best known by their Arp numbers (such as Arp 220).

Today, the physical processes that lead to the peculiarities seen in the Arp atlas are thought to be well understood. A large number of the objects have been interpreted as interacting galaxies, including M51 (Arp 85), Arp 220, and the Antennae Galaxies (NGC 4038/NGC 4039, or Arp 244). A few of the galaxies are simply dwarf galaxies that do not have enough mass to produce enough gravity to allow the galaxies to form any cohesive structure. NGC 1569 (Arp 210) is an example of one of the dwarf galaxies in the atlas. A few other galaxies are radio galaxies. These objects contain active galactic nuclei that produce powerful jets of gas called radio jets. The atlas includes the nearby radio galaxies M87 (Arp 152) and Centaurus A (Arp 153).

Many of the peculiar associations present in the catalogue have been interpreted as galaxy mergers, though Arp refuted the idea, claiming, rather, that apparent associations were prime examples of ejections.

This Argo Navis format Atlas of Peculiar Galaxies was compiled by Bob Hill.
Wikipedia wrote:
A Hickson Compact Group (abbreviation: HCG) is a collection of galaxies designated as published by Paul Hickson in 1982.

The most famous group on Hickson's list of 100 objects is HCG 92, Stephan's Quintet.

According to Hickson: “Most compact groups contain a high fraction of galaxies having morphological or kinematical peculiarities, nuclear radio and infrared emission, and starburst or active galactic nuclei (AGN) activity. They contain large quantities of diffuse gas and are dynamically dominated by dark matter. They most likely form as subsystems within looser associations and evolve by gravitational processes. Strong galaxy interactions result and merging is expected to lead to the ultimate demise of the group. Compact groups are surprisingly numerous, and may play a significant role in galaxy evolution.

Wikipedia page :-

This Argo Navis format catalog of Hickson Compact Galaxy Groups was compiled by Yahoo forum member spacerama.
This catalog of Dark Nebulae was compiled by forum member alphaargonavis
This catalog of Milky Way Globular Clusters was complied by Bill Ferris.
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.
This user form is hosted in Sydney, Australia at the Wildcard Innovations web site.

The Australian Privacy Act 1988 (Privacy Act) was introduced to promote and protect the privacy of individuals.

The privacy of individuals, including our customers, is of utmost importance to Wildcard Innovations.

Privacy Policy
We encourage forum members to read our Privacy Statement

A copy of the Wildcard Innovations Privacy Statement can be found here :-
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.

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