Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 5257, NGC 5258
Getting plate-solving status, please wait...
ARP 240 NGC 5257  NGC 5258 Colliding Galaxies, 


            Jerry Macon
ARP 240 NGC 5257  NGC 5258 Colliding Galaxies
Powered byPixInsight

ARP 240 NGC 5257 NGC 5258 Colliding Galaxies

Technical card

Dates:June 21, 2019

Frames:Astrodon Gen 2 LRGB 36mm: 135x120" (gain: 99.00) -16C bin 1x1

Integration: 4.5 hours

Avg. Moon age: 18.65 days

Avg. Moon phase: 83.84%

Bortle Dark-Sky Scale: 3.00

Temperature: 15.00

Basic astrometry details job: 3086510

RA center: 13h 39' 48"

DEC center: +0° 47' 49"

Pixel scale: 0.701 arcsec/pixel

Orientation: 177.707 degrees

Field radius: 0.261 degrees

Resolution: 2200x1540

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Images from the following two scopes (piggybacked) contributed to this image:
AG12+ASI1600MM at .70 asec/pix (L)
TV127is+ASI183MM at .75 asec/pix. (RGB)
They were all registered to the best R image taken on the AG12.
This image was unguided.

Arp 240 is a pair of interacting spiral galaxy located in the constellation Virgo. The two galaxies are listed together as Arp 240 in the Atlas of Peculiar Galaxies. The galaxy on the right is known as NGC 5258, while the galaxy on the left is known as NGC 5257. Both galaxies are distorted by the gravitational interaction, and both are connected by a tidal bridge, as can be seen in images of these galaxies.
Distance from Earth 345 million light years.

Arp 240 is an astonishing galaxy pair, composed of spiral galaxies of similar mass and size, NGC 5257 and NGC 5258. The galaxies are visibly interacting with each other via a bridge of dim stars connecting the two galaxies, almost like two dancers holding hands while performing a pirouette. Both galaxies harbour supermassive black holes in their centres and are actively forming new stars in their discs. Arp 240 is located in the constellation Virgo, approximately 300 million light-years away, and is the 240th galaxy in Arp's Atlas of Peculiar Galaxies.



Jerry Macon
License: Attribution Creative Commons


  • ARP 240 NGC 5257  NGC 5258 Colliding Galaxies, 


            Jerry Macon
  • Final
    ARP 240 NGC 5257  NGC 5258 Colliding Galaxies, 


            Jerry Macon

Sky plot

Sky plot


ARP 240 NGC 5257  NGC 5258 Colliding Galaxies, 


            Jerry Macon