Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2023 July 1
Explanation: This tantalizing trio of galaxies is sometimes called the Draco Group, located in the northern constellation of (you guessed it) Draco, the Dragon. From left to right are face-on spiral NGC 5985 -- elliptical galaxy NGC 5982, and edge-on spiral NGC 5981, all within a single telescopic field of view that spans a little more than the width of the full moon. While the group is far too small to be a galaxy cluster and has not been catalogued as a compact galaxy group, these galaxies all do lie roughly 100 million light-years from planet Earth. On close examination with spectrographs, the bright core of the striking face-on spiral NGC 5985 shows prominent emission in specific wavelengths of light, prompting astronomers to classify it as a Seyfert, a type of active galaxy. Not as well known as other tight groupings of galaxies, the contrast in visual appearance still makes this triplet an attractive subject for astrophotographers. This impressively deep exposure hints at a faint dim halo along with sharp-edged shells surrounding elliptical NGC 5982, evidence of past galactic mergers. It also reveals many even more distant background galaxies.
Authors & editors:
Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
A service of: ASD at NASA / GSFC
& Michigan Tech. U.