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Grasslands Observatory: Table of Arp Galaxies


The following table of Arp Galaxies is based on the Arp taxonomy in The Atlas of Pecular Galaxies by Halton Arp. The table contains links to images of the Arp Galaxies obtained at the Grasslands Observatory by Tim Hunter and James McGaha.  The earliest black and white images from November 1998 to August 1999 were one minute exposures with the original Grasslands 24-inch telescope at f/5 through a clear filter using an Apogee AP7 CCD.  Early color images were with the AP7 CCD and photometric R, V, and B filters. 

Since 2015, the Grasslands Observatory has been significally improved and enlarged with the addition of three new 14 x 14 foot roll-off roof buildings containing telescopes for remote operations. See Grasslands Operations.

At the present time all imaging is done remotely using a PlaneWave CDK24 24-inch f/6.5 telescope and FLI Proline 9000 CCD, an ASA 20-inch f/3.5 astrograph and FLI Proline 9000 CCD, or a Takahasi Epsilon 180 f/2.8 telescope with a Canon EOS Ra camera. See our Operations for more details.

More detailed information about Arp galaxies can be found in a variety of sources, including MegaStar, The Sky, and the reprint of the entire Arp atlas on the California Institute of Technology webpage. All images are oriented with the North at the top and the West to the right. The image scale varies from image to image due to the differing degrees of cropping. Nevertheless, it is usually possible to compare two different images to observe the relative size of different Arp galaxies.

tbh 18 April 2010; revised 26 April 2017; revised Sunday, March 25, 2018; revised Tuesday May 21, 2019.

I. Spiral Galaxies (Arp1-Arp36)

A. Low Surface Brightness Galaxies
B. Split Arm Galaxies
C. Detached Segments
D. Three Armed Galaxies
E. One Armed Galaxies
F. One Heavy Armed Galaxies
G. Integral Sign Galaxies

II. Spiral Galaxies With Companions on Arms (Arp37-Arp101)
A. Low Surface Brightness Companions
B. Small, High Surface Brightness Companions
C. Large, High Surface Brightness Companions
D. Elliptical Galaxy Companions

III. Elliptical and Elliptical-like Galaxies (Arp102-Arp145)
A. Connected to Spiral Galaxies
B. Galaxies with Repelling Spiral Arms
C. Close to and Perturbing Spiral Galaxies
D. Galaxies with Nearby Fragments
E. Material Emanating From Elliptical Galaxies

IV (a). Galaxies Not Classifiable as S or E (Arp 146-Arp208)

A. Galaxies with Associated Rings
B. Galaxies with Jets
C. Galaxies Disturbed with Interior Absorption
D. Galaxies with Diffuse Elements
E. Galaxies with Diffuse Counter Tails
F. Galaxies with Narrow Counter Tails
G. Galaxies with Narrow Filaments
H. Galaxies with Material Ejected from the Nuclei

IV (b). Galaxies Not Classifiable as S or E (Arp 209-Arp268)

I. Galaxies with Irregularities, Absorption, and Resolution
J. Galaxies with Adjacent Loops
K. Galaxies with Amorphous Spiral Arms
L. Galaxies with Concentric Rings
M. Galaxies with the Appearance of Fission
N. Galaxies with Irregular Clumps

V. Galaxies Listed by Group Characteristics (Arp269-332)

A. Galaxies with Connected Arms
B. Interacting Galaxies
C. Galaxies with Infall and Attraction
D. Galaxies with "Wind" Effects
E. Galaxies with Long Filaments
F. Galaxies with Probable Continuation of Filaments
G. Galaxy Groups
H. Galaxy Chains

VI. Miscellaneous (Arp333-338)
Back to Top | Color Images of Selected Arp Galaxies