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 [32]

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» Paturel et al., 1989 [144]
PGC RA Dec Type Dim Btot HRV PA Names
PGC 32390 10 49 25.7 +32 46 29 SB 1.2 x .9 14.8 1680 40 IC 2604, UGC 5927, MCG 6-24-16, CGCG 184-17, VV 538, KUG 1046+330
PGC 32424 10 49 49.4 +32 58 51 SB M 1.7 x .9 12.5 1621 50 NGC 3395, UGC 5931, MCG 6-24-17, CGCG 184-18, ARAK 257, (VV 246), (ARP 270)
PGC 32434 10 49 56.1 +32 59 22 IB M 2.9 x 1.2 12.6 1633 100 NGC 3396, UGC 5935, MCG 6-24-18, CGCG 184-19, (VV 246), (ARP 270)
PGC 32464 10 50 15.4 +32 46 06 S .9 x .3 15.6 IC 2608, CGCG 184-22, KUG 1047+330
PGC 32543 10 51 21.1 +32 46 04 L 1.8 x .8 13.1 645 178 NGC 3413, UGC 5960, MCG 6-24-24, CGCG 184-27, IRAS 10485+3301, KUG 1048+330
PGC 32584 10 51 46.5 +32 54 02 SB 2.7 x .8 13.2 1497 112 NGC 3424, UGC 5972, MCG 6-24-25, CGCG 184-28, IRAS 10489+3309, KUG 1048+331
PGC 32614 10 52 10.9 +32 57 09 SB 4.1 x 2.2 12.2 1585 30 NGC 3430, IC 2613, UGC 5982, MCG 6-24-26, CGCG 184-29, IRAS 10494+3312, KUG 1049+332
PGC 32704 10 53 34.3 +32 45 01 E  x  MCG 6-24-33

Finder Chart

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

Finder Chart Pair of Galaxies NGC 3395/6 (Arp 270)
Pair of Galaxies NGC 3395/6 (Arp 270) in constellation Leo Minor. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Visual Observation

762 mm Aperture: Both galaxies are slightly more elongated than wide and are at right angles to each other, one of which is slightly wider compared to the second. The nuclei are each perceptible as points. — 30" SlipStream-Dobson f/3.3, Hasliberg, 14. 2. 2023, Eduard von Bergen

More Objects Nearby (±15°)

References