British Astronomical Association
Supporting amateur astronomers since 1890

BAA Images Picture of the week Peter Goodhew FRAS

Observation by Peter Goodhew FRAS: Arp 242 - The Mice Galaxies

Uploaded by

Peter Goodhew FRAS


Peter Goodhew FRAS


2021 Apr 18 - 18:16


2021 Apr 28 - 18:17


The Mice (NGC4676)

Planetarium overlay


Coma Berenices

Field centre

RA: 12h46m
Dec: +30°43'
Position angle: +43°58'

Field size

0°09' × 0°06'

  • APM TMB LZOS 152 Refractors
  • QSI6120 CCD Cameras
  • 10Micron GM2000 HPS mount

7 hours total integration LRGB


Fregenal de la Sierra, Spain

Target name

Arp 242


Arp 242 - The Mice Galaxies

About this image

ARP 242 - The Mice Galaxies - is a pair of interacting galaxies in the constellation of Coma Berenices about 300 million light-years from Earth. They were discovered by William Herschel on March 13, 1785 giving them designation NGC 4676. The northern galaxy is IC 819 and the southern IC 820. I'm intrigued at how the night sky must appear when viewed from within one of these galaxies, with two "milky ways" crossing the sky.
Image captured on my dual rig in Spain. More details at

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.