NGC 4725 and NGC 4747

MouseOver for object identification, Click on image for a zoomable 75% image

Location / Date

Zellerndorf, April 2017

Telescope / Mount / Guiding

ASA 10" Astrograph, ASA 3" Wynne-Corrector (focal length 910 mm)
ASA DDM60, no Guiding

Camera / Exposure

FLI ML8300, Astrodon filters

Lum 48 x 10min, R 13 x 10min, G 13 x 10min, B 13 x 10min

Total exposure time: 14h 30min


PixInsight, Fitswork, Photoshop


NGC 4725 is an intermediate barred spiral galaxy with only one sprial arm about 41 million light-years away in the constellation Coma Berenices. NGC 4725 is a Seyfert Galaxy, suggesting an active galactic nucleus containing a supermassive black hole. Its central region dominated by the yellowish light of cool, older stars giving way to younger hot blue star clusters along dusty spiral outskirts.

In 2016 the German TBG-Group ( presented a possible new stellar stream around NGC 4725.

NGC 4747 (Arp 159) shows a highly warped structure and an extended and faint tidal tail, probably caused by interaction with NGC 4725.

Another image of NGC 4725, one of my first images at the beginning of my astrophotography carrier and taken with a DSLR can be found here.

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