Hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  NGC 4839  ·  NGC 4874  ·  NGC 4889  ·  NGC 4895  ·  NGC 4921  ·  NGC 4931
NGC 4889 (also known as Caldwell 35, Coma B), 



    
        

            Bernd Neumann
NGC 4889 (also known as Caldwell 35, Coma B)
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NGC 4889 (also known as Caldwell 35, Coma B)

Technical card

Imaging telescopes or lenses: TS Optics GSIMN6

Imaging cameras: ALCCD8L

Mounts: EQ 6 Pro EQ6 PRO Synscan

Guiding telescopes or lenses: TS OAG 9mm

Guiding cameras: Atik 16IC

Software: Fitswork 4  ·  PHD2.2


Dates:April 17, 2015

Frames: 3x600"

Integration: 0.5 hours

Avg. Moon age: 28.06 days

Avg. Moon phase: 2.42%


Basic astrometry details

Astrometry.net job: 823079

RA center: 13h 0' 2"

DEC center: +28° 0' 57"

Pixel scale: 2.956 arcsec/pixel

Orientation: 24.536 degrees

Field radius: 1.497 degrees


Resolution: 620x411

Locations: Heimsternwarte, Hilden, NRW, Germany

Description

NGC 4889 (also known as Caldwell 35, Coma B) is a class-4 supergiant elliptical galaxy.[4] It was discovered in 1785 by the British astronomer Frederick William Herschel I, who catalogued it as a bright, nebulous patch. The brightest galaxy within the northern Coma Cluster, it is located at a distance of 94 million parsecs (308 million light years) from Earth. Unlike a flattened, disc-shaped spiral galaxy like the Milky Way, NGC 4889 has no visible dust lanes or spiral arms and has a smooth, featureless, egg-shaped profile that diminishes in luminosity with distance from the center. At the core of the galaxy is a supermassive black hole that heats up the intracluster medium through the action of friction from infalling gases and dust. The X-ray emission from the galaxy extends out to several million light years of the cluster.

As with other similar elliptical galaxies, only a fraction of the mass of NGC 4889 is in the form of stars. They have a flattened, unequal distribution that bulges within its edge. Between the stars is a dense interstellar medium full of heavy elements emitted by evolved stars. In addition it also has a diffuse stellar halo that extends out to one million light years in diameter. Orbiting the galaxy is a very large population of globular clusters. NGC 4889 is also a strong source of soft X-ray, ultraviolet, and radio frequency radiation.

As the largest and the most massive galaxy easily visible to Earth, NGC 4889 has played an important role in both amateur and professional astronomy, and has become a prototype in studying the dynamical evolution of other supergiant elliptical galaxies in the more distant universe.

From Wikipedia, the free encyclopedia

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NGC 4889 (also known as Caldwell 35, Coma B), 



    
        

            Bernd Neumann