NGC 5777 explained

NGC 5777
Epoch:J2000
Constellation Name:Draco
Appmag B:14.2
Sbrightness:23.96 mag/arcsec2
Ra:14h 51m 18s
Dec:+58° 58 40
Dist Ly:~114 million
Names:UGC 9568, LEDA 53043, ISOSS J14513+5858

NGC 5777 is a large edge-on spiral galaxy located in the constellation Draco.[1] Its speed relative to the cosmic microwave background is 2,210 ± 5 km/s, which corresponds to a Hubble distance of 32.6 ± 2.3 Mpc (~106 million ly). NGC 5777 was discovered by German-British astronomer William Herschel in 1789.[2]

The luminosity class of NGC 5777 is II and it has a broad HI line. It is also an active galaxy with narrow optical emission lines.[3] To date, nine non-redshift measurements yield a distance of 44.289 ± 8.577 Mpc (~144 million ly), which is just within the distance values of Hubble.

A spectrum obtained on July 10, 2001, by the Isaac Newton Telescope showed a type-IIp supernova at the center of NGC 5777.[4] SN 2001dc was formed from a group of low-luminosity events, among with other supernovae in the region. They contain narrow spectral lines (indicating low expansion velocities) and low luminosities at every phase, which is untypical for a supernovae.[5]

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Notes and References

  1. Web site: NGC 5777 - Spiral Galaxy in Draco TheSkyLive.com . 2024-04-16 . theskylive.com.
  2. News: NGC 5777 Galaxy Facts (UGC 9568) & Distance . April 16, 2024 . Universe Guide . 2 July 2022 . en-us . Guide . Universe .
  3. Web site: Salvatore . Iovene . NGC 5777 . 2024-04-16 . AstroBin . en.
  4. Hurst . G. M. . Armstrong . M. . Meikle . P. . Bramich . D. . Corradi . R. . Erwin . P. . Boles . T. . Irwin . M. . Fassia . A. . 2001-07-01 . Supernova 2001dc in NGC 5777 . International Astronomical Union Circular . 7662 . 1 . 2001IAUC.7662....1H . 0081-0304.
  5. Web site: Low-luminosity Type II supernovae: spectroscopic and photometric evolution . 2024-04-16 . academic.oup.com.