NGC 4993

galaxy in the constellation of Hydra

In the Vinony graph

Vinony's link graph records 607 inbound references to NGC 4993, and connects out to list of stars in Hydra, NGC 4624 and GW170817.

It is catalogued under topics including Active galaxies, Astronomical objects discovered in 1789 and Elliptical galaxies.

Vinony links it to 35 Wikipedia language editions.

Key facts

Constellation: Hydra
Right ascension: 13 09 47.7
Declination: −23 ° 23 ′ 02 ″
Heliocentric radial velocity: 2916 km/s
Distance: 44.1 Mpc (144 Mly )
Group or cluster: NGC 4993 Group
Type: (R')SAB0^-(rs)
Size: ~55,000 ly (17 kpc ) (estimated)
Apparent size v: 1.3 x 1.1
Notable features: Host of neutron star merger detected as gravitational wave GW170817 and gamma-ray burst GRB 170817A

via Wikipedia infobox

Wikidata facts

Instance of: lenticular galaxy
Constellation: Hydra
Distance from Earth: 39.57
Image: NGC 4993 and GRB170817A after glow.gif

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catalog code: LEDA 45657
time of discovery or invention: 1836-03-25
discoverer or inventor: John Frederick William Herschel
Commons category: NGC 4993
apparent magnitude: 9.224
redshift: 0.009787
right ascension: 197.4487750
declination: -23.3838306
radial velocity: 2920
epoch: J2000.0
galaxy morphological type: E/S0

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Encyclopedic overview

NGC 4993 starmap near ψ Hydrae, near galaxies of NGC 4968, NGC 4970, NGC 5042, IC 4180, IC 4197 NGC 4993 (also catalogued as NGC 4994 in the New General Catalogue) is a lenticular galaxy located about 140 million light-years away in the constellation Hydra. It was discovered on 26 March 1789 by William Herschel and is a member of the NGC 4993 Group.

NGC 4993 was the site of GW170817, a collision of two neutron stars, the first astronomical event detected in both electromagnetic and gravitational radiation, a discovery given the Breakthrough of the Year award for 2017 by the journal Science. The detection of gamma-ray burst GRB 170817A simultaneous with the gravitational wave event, for example, provided the first direct confirmation that binary neutron star collisions generate short gamma-ray bursts.

Excerpted from Wikipedia’s “NGC 4993” article, available under the CC BY-SA 4.0 licence.