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Grasslands Observatory: Color Images of Selected Arp Galaxies


These tri-color CCD images were obtained at various times from 1996 to the present. The very earliest were taken with an HPC-1 camera (1024 x 1024, twelve micron TI chip) or an Apogee AP7 camera (512 x 512, 24 micron SITe chip). The HPC-1 was an excellent early camera with small pixels. The AP7 had a greater photon efficiency, particularly in the blue portion of the spectrum.

In March 2001, a Finger Lakes Instrumentation Dream Machine CCD camera was installed at the Grasslands Observatory. This camera had a high quantum efficiency SITe 1024 x 1024 twenty-four micron CCD chip. It provided a nearly 28 minute field of view on the original 24-inch f/5 reflector at the observatory. The Dream Machine was used in operation with a Finger Lakes Instrumentation CFW-1 Color Filter Wheel and an Optec TCF temperature compensating focuser. The filter wheel contained Photometric R, V, B and I filters and also had an Open slot (O) and a Clear filter (C). This instrument combination was used for much of the imaging at the Grasslands Observatory until late 2014.

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. The original 24-inch telescope has been converted to visual use at the Cassegrain focus (f/20). See Grasslands Operations.

The main imaging is now with a PlaneWave 24-inch CDK24 f/6.5 telescope with a Finger Lakes Proline 9000 CCD and a Finger Lakes CFW5-7 filter wheel with clear, photometric red (R), photometric green (V), photometric blue (B), and hydrogen alpha filters or with a TPO RC 16-inch f/8 telescope with a Quantum Scientific Imaging (QSI) 532 CCD and filter wheel with luminous, red, green, blue, and hydrogen alpha filters.


tbh 18 April 2010; revised 24 April 2017

All images are oriented with the North at the top and the West to the right.


Arp Galaxy Other Name(s) Thumbnail Image
14 NGC7314
16 M66; NGC3627 m66.jpg (27996 bytes)
AP7 image

Dream Machine image 

ST10 CCD image

18 NGC4088 NGC4088 (Arp18) on the evening of April 21, 2017
25 NGC2276 (Arp25); NGC2300 (Arp114) Arp25 and Arp114
26 M101; NGC5457 m101.jpg (14732 bytes)
AP7 image

Dream Machine image

Takahashi Epsilon 180 telescope, Canon 20Da camera, five 10-minute exposures median combined.

29 NGC6946; Caldwell12
37 M77; NGC1068
41 NGC1232 ngc1232(Arp41).jpg (50168 bytes)

71 NGC6045
76 M90; NGC4659 + IC3583
77 NGC1097; Caldwell67

78 NGC772+770 Arp78
84 NGC5935/5934; UGC8900 Arp84.jpg (23119 bytes)
85 M51; NGC5194/5195; Whirlpool Galaxy m51(Arp85).TIF (1030036 bytes)
AP7 image

Dream Machine image

94 NCG3226+3227 NGC3226/3227  (Arp94)
104 NGC5218+5216 (Keenan's System) Arp 104 (NGC5218 and NGC5216)
114 and 25 NGC2300; NGC2276 Arp25 and Arp114
116 M60; NGC4649

Meade LXD55 8-inch f/4 images with QSI 532 CCD. The major objects are labeled in the below image.


120 NGC4438+4435
123 NGC1888; MCG-2-14-13 arp123.jpg (119299 bytes)
134 M49; NGC4472 M49
135 NGC1023
Dream Machine image

QSI 532 image


152 M87; NGC4486
153 NGC5128; Centaurus A; Caldwell77 ngc5128(Arp153).TIF (707868 bytes)
AP7 image

Dream Machine image

154 NGC1316 Arp154
157 NGC520 ngc520(Arp157).tif (2534122 bytes)

168 M32; NGC221; UGC452
184 NGC1961
206 NGC3432
214 NGC3718 Arp214
243 NGC2623 ngc2623.jpg (57929 bytes)
244 NGC4038; NGC4039; Antennae, Ring-Tail Galaxy; Caldwell60-61 ngc4038(Arp244).TIF (2737739 bytes)
AP7 image


Dream Machine image

268 UGC4305
269 NGC4490+4485 NGC4490+NGC4485 (Arp 269)
270 NGC3395

Dream Machine image

281 NGC4631; Caldwell32
299 NGC3690 ngc3690.jpg (21557 bytes)
Shown are Arp296 (small galaxy up and to the left) and NGC3690 interacting with IC694.
316 NGC3139; Hickson 44B Arp316

Dream Machine CCD image

317 M65; NGC3623 m65(Arp317).TIF (737322 bytes)
AP7 image

Dream Machine image

M65 and M66

319 NGC7320; Stephans Quintet ngc7320.jpg (70767 bytes)
AP7 image

337 M82; NGC3034; Cigar Galaxy M82
PlaneWave CDK24 image

Dream Machine image

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