Pair of Galaxies NGC 3395/6 (Arp 270)

NGC 3395/6
NGC 3395/6: Galaxienpaar in Leo Minor; 500 mm Cassegrain 3625 mm f/7.2; SBIG STL11K; 270+40+40+40 min LRGB; Bernese Highlands; © 2015 Radek Chromik

History

The galaxy pair NGC 3395/6 was discovered on 7 December 1785 by the German-British astronomer William Herschel with his homemade 18.7 inch f/12.8 reflecting telescope in Slough, England. He listed them under the designations I 116 and I 117. The same night he also encountered NGC 3413 (II 439), NGC 3424 (II 494), and NGC 3430 (I 118). [196, 277, 313] He classified his discoveries based on purely visual impressions, with I = bright nebulae and II = faint nebulae. [269]

The French astronomer Stephane Javelle searched this area of ​​the sky on 17 May 1896 with the 76 cm refractor telescope of the Observatoire de Nice and recorded four other nebulae: IC 2604, IC 2605, IC 2608 and IC 2612, with IC 2605 being a bright node in the galaxy NGC 3995. [196, 277, 315]

Halton Arp divided his «Atlas of Peculiar Galaxies», published in 1966, into groups based on purely morphological criteria. The pair of galaxies here received the designation Arp 270 as a pair of interacting galaxies. [199]

Physical Properties

The interacting galaxy pair NGC 3395/6 is at a distance of 15 to 30 Mpc. [145] According to HyperLEDA [134] they together form the NGC 3430 galaxy group with a total of 15 members, which also includes NGC 3381, NGC 3424, NGC 3430, NGC 3442, IC 2604 and IC 2608. IC 2612 (PGC 32704) has a much higher redshift of z = 0.04452, which corresponds to a heliocentric velocity of about 13400 km/s. This galaxy is far in the background.

NGC 3413
NGC 3413: [147]
NGC 3424
NGC 3424: [147]
NGC 3430
NGC 3430: [147]
IC 2604
IC 2604: [147]
IC 2608
IC 2608: [147]
«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
NameRA [hms]Dec [dms]mTypeDim [']Btot [mag]HRV [km/s]PA [°]
PGC 32390, IC 260410 49 25.7+32 46 29SB1.2 x .914.8168040
PGC 32424, NGC 339510 49 49.4+32 58 51SB M1.7 x .912.5162150
PGC 32434, NGC 339610 49 56.1+32 59 22IB M2.9 x 1.212.61633100
PGC 32464, IC 260810 50 15.4+32 46 06S.9 x .315.6
PGC 32543, NGC 341310 51 21.1+32 46 04L1.8 x .813.1645178
PGC 32584, NGC 342410 51 46.5+32 54 02SB2.7 x .813.21497112
PGC 32614, NGC 3430, IC 261310 52 10.9+32 57 09SB4.1 x 2.212.2158530
PGC 3270410 53 34.3+32 45 01E x 

Finder Chart

The interacting galaxy pair NGC 3395/6 is located in the constellation Leo Minor. The best viewing time is October to June.

Chart Pair of Galaxies NGC 3395/6 (Arp 270)
Pair of Galaxies NGC 3395/6 (Arp 270) in constellation Leo Minor. Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

More Objects Nearby (±15°)

References

134Lyon-Meudon Extragalactic Database (LEDA); leda.univ-lyon1.fr
144Catalogue of Principal Galaxies (PGC); Paturel G., Fouque P., Bottinelli L., Gouguenheim L.; Astron. Astrophys. Suppl. Ser. 80, 299 (1989); cdsarc.unistra.fr/viz-bin/cat/VII/119 (2021-02-18)
145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
147Aladin Lite; aladin.u-strasbg.fr/AladinLite (2020-12-23)
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
199«Atlas Of Peculiar Galaxies», Halton Arp, 1966; Astrophysical Journal Supplement, vol. 14, p.1 (1966); DOI:10.1086/190147; Bibcode:1966ApJS...14....1A
269William Herschel's catalog of Deep Sky objects; messier.seds.org/xtra/similar/herschel.html (2021-12-27)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
313«A New General Catalogue of Nebulae and Clusters of Stars, being the Catalogue of the late Sir John F.W. Herschel, Bart., revised, corrected, and enlarged» Dreyer, J. L. E. (1888); Memoirs of the Royal Astronomical Society. 49: 1–237; Bibcode:1888MmRAS..49....1D
315«Second Index Catalogue of Nebulae and Clusters of Stars; containing objects found in the years 1895 to 1907, with Notes and Corrections to the New General Catalogue and to the Index Catalogue for 1888–94» Dreyer, J. L. E. (1910); Memoirs of the Royal Astronomical Society. 59: 105–198; Bibcode:1910MmRAS..59..105D