NGC 4993 and GRB 170817A afterglow as taken by Hubble Space Telescope[1]
Observation data (J2000 epoch)
Constellation
Hydra
Right ascension
13h 09m 47.7s[2]
Declination
−23° 23′ 02″[2]
Redshift
0.009727[2]
Heliocentric radial velocity
2916 km/s[2]
Distance
44.1 Mpc (144 Mly)[2]
Group or cluster
NGC 4993 Group[3]
Apparent magnitude (V)
13.32[2]
Characteristics
Type
(R')SAB0^-(rs)[2]
Size
~55,000 ly (17 kpc) (estimated)[2]
Apparent size (V)
1.3 x 1.1[2]
Notable features
Host of neutron star merger detected as gravitational wave GW170817 and gamma-ray burst GRB 170817A
Other designations
NGC 4994, ESO 508-18, AM 1307-230, MCG -4-31-39, PGC 45657, WH III 766[4]
Preview warning: Page using Template:Infobox galaxy with unknown parameter "image_size"
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[5] located about 140 million light-years away[2] in the constellation Hydra.[6] It was discovered on 26 March 1789[7] by William Herschel[6][7] and is a member of the NGC 4993 Group.[3]
NGC 4993 is the site of GW170817, the first astronomical event detected in both electromagnetic and gravitational radiation, the collision of two neutron stars, a discovery given the Breakthrough of the Year award for 2017 by the journal Science.[8][9] Detecting a gravitational wave event associated with the gamma-ray burst provided direct confirmation that binary neutron star collisions produce short gamma-ray bursts.[10]
^Cite error: The named reference NASA-20171016a was invoked but never defined (see the help page).
^ abcdefghij"NASA/IPAC Extragalactic Database". Results for NGC 4993. Retrieved 3 June 2018.
^ abHjorth, Jens; Levan, Andrew J.; Tanvir, Nial R.; Lyman, Joe D.; Wojtak, Radosław; Schrøder, Sophie L.; Mandel, Ilya; Gall, Christa; Bruun, Sofie H. (16 October 2017). "The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817". The Astrophysical Journal. 848 (2): L31. arXiv:1710.05856. Bibcode:2017ApJ...848L..31H. doi:10.3847/2041-8213/aa9110. hdl:2381/41880. S2CID 51812508.
^Staff (2017). "Galaxy NGC 4993 - Galaxy in Hydra Constellation". dso-browser.com. Archived from the original on 16 September 2017. Retrieved 30 September 2017.
^Cite error: The named reference :2 was invoked but never defined (see the help page).
^ ab"NGC 4993". Deep Sky Observer's Companion. Retrieved 28 August 2017.
^ ab"New General Catalog Objects: NGC 4950 - 4999". cseligman.com. Retrieved 5 June 2018.
^"Breakthrough of the year 2017". Science | AAAS. 22 December 2017.
^Overbye, Dennis (16 October 2017). "LIGO Detects Fierce Collision of Neutron Stars for the First Time". The New York Times. Retrieved 16 October 2017.
NGC4993 (also catalogued as NGC 4994 in the New General Catalogue) is a lenticular galaxy located about 140 million light-years away in the constellation...
detectors on 17 August 2017, originating from the shell elliptical galaxy NGC4993. The signal was produced by the last moments of the inspiral process of...
collaborated to detect the electromagnetic counterpart, a kilonova in the galaxy NGC4993, 40 megaparsecs away, emitting a short gamma ray burst (GRB 170817A) seconds...
electromagnetic spectrum (AT 2017gfo) located in a relatively nearby galaxy, NGC4993. Observations of AT 2017gfo confirmed that it was the first conclusive...
gravitational wave associated with the merger of two neutron stars in NGC4993, an elliptical galaxy in the constellation Hydra. GW170817 co-occurred...
DES concluded that the optical counterpart they have identified near NGC4993 is associated with GW170817. This discovery ushers in the era of multi-messenger...
83. Positioned just 1.8° to the south-southwest is the planetary nebula NGC 3242. Mu Hydrae has an annual parallax shift of 13.93 mas, which yields a...
NGC 4701 is an unbarred spiral galaxy in the New General Catalogue, located in the constellation Virgo. It was discovered by the English astronomer William...
NGC 4614 is a barred lenticular galaxy in the New General Catalog. It is located in the constellation of Coma Berenices. It was discovered in 1864 by...
Global Information
