NGC 718
Galaxy in the constellation Pisces
NGC 718 is an intermediate spiral galaxy in the constellation of Pisces. Its velocity with respect to the cosmic microwave background is 1,450±22 km/s, which corresponds to a Hubble distance of 69.7 ± 5.0 Mly (21.38 ± 1.54 Mpc). Additionally, one non-redshift measurement gives a similar distance of 69.80 Mly (21.400 Mpc). It was discovered by German-British astronomer William Herschel on 13 December 1784.
NGC 718 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.
A star-forming disk has been detected around the core of NGC 718. The size of its semi-major axis is estimated at 1,100 ly (330 pc).
01Supermassive black hole
Based on measurements of the near-infrared K-band luminosity of the galaxy's bulge, NGC 718 has a supermassive black hole with a mass of 1×107.5M☉ (32 million solar masses).
02NGC 676 group
03Intermediate-luminosity red transient
One intermediate-luminosity red transient (ILRT) has been observed in NGC 718:
- AT 2019udc (Type ILRT, mag. 18.813) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 4 November 2019. This object had initially been classified as a luminous blue variable.
Sources and credits
This article is adapted from the Wikipedia article “NGC 718”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- NGC 0718 SDSS.jpg by Donald Pelletier, CC BY-SA 4.0
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