Interacting Galaxies NGC 5752/4 (Arp 297)
Object Description
The galaxies NGC 5754 and NGC 5755 were discovered on 16 May 1787 by the German-British astronomer William Herschel with his 18.7" reflecting telescope. The fainter, smaller companions NGC 5752 and NGC 5753 were only discovered 91 years later on 1 April 1878 by the British Astronomer Lawrence Parsons, fourth Earl of Rosse, using his father William's 72" reflecting telescope. [277] [277]
Halton Arp divided his «Atlas of Peculiar Galaxies», published in 1966, into groups based on purely morphological criteria. The two galaxies NGC 5752/4 were given the designation Arp 297 as interacting galaxies. While he incorrectly listed the companion galaxy as NGC 5755, he meant NGC 5752, which is clear from his description «companion on arm has long westward tail». [199] The galaxy pair NGC 5752/4 is reported as a radio galaxy with a distance of 63 Mpc to 66 Mpc. For the other pair of galaxies NGC 5753/5, however, one finds about twice the distance: 130 Mpc. The two pairs are therefore only coincidentally close to each other from our line of sight. [145]
| Name | RA | Dec | Type | bMag | vMag | B-V | SB | Dim | PA | z | D(z) | Dreyer Description | Identification, Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NGC 5752 | 14 45 14.2 | +38 43 45 | Gx (Sb) | 14.8 | 14.0 | 0.8 | 11.4 | 0.5 × 0.2 | 120 | 0.015140 | 63.95 | F, 1' p h 1878 | MCG 7-30-60; CGCG 220-52 |
| NGC 5753 | 14 45 18.8 | +38 48 23 | Gx (S) | 15.8 | 15.0 | 0.8 | 13.5 | 0.6 × 0.5 | 153 | 0.032099 | 135.5 | F, bM, np h 1878 | MCG 7-30-62; CGCG 220-53; NPM1G +39.0358; IRAS 14434+3859 |
| NGC 5754 | 14 45 19.6 | +38 43 58 | Gx (SBb) | 13.8 | 13.0 | 0.8 | 14.3 | 2 × 1.8 | 33 | 0.015214 | 64.26 | cF, cS, R, bM | WH III 687; h 1878; GC 3992; UGC 9505; MCG 7-30-61; CGCG 220-52; Arp 297; IRAS 14432+3856 |
| NGC 5755 | 14 45 24.5 | +38 46 49 | Gx (SB?) | 14.3 | 13.5 | 0.8 | 13.6 | 1.3 × 1 | 15 | 0.032229 | 136.1 | F, 2' nf h 1878 | UGC 9507; MCG 7-30-63; CGCG 220-53; Arp 297 |
Finder Chart
The galaxy NGC 5754 is located in the constellation Bootes. The best viewing time is December to September.
Visual Observation
400 mm Aperture: In the 21 mm ethos (85x) the galaxy NGC 5754 is directly visible as a small, faint nebula. NGC 5755 only reveals itself if you look just past it. In the 10 mm DeLite (180x) the three galaxies NGC 5752, 5754, 5755 are visible as a diffuse something. Perhaps with a darker sky even more could be gained from these galaxies. — 400 mm f/4.5 Taurus Dobsonian, Glaubenberg, SQM 21.34, a bit windy, Sahara dust and hazy, 22. 5. 2022, 00:30, Bernd Nies