NGC 747 is a spiral galaxy located in the constellation Cetus.[1] Its speed relative to the cosmic microwave background is 5,100 ± 19 km/s, which corresponds to a Hubble distance of 75.2 ± 5.3 Mpc (~245 million ly).[2] NGC 747 was discovered by American astronomer Francis Leavenworth in 1886.[3] The luminosity class of NGC 747 is II and it has a broad HI line.[4] To date, four non-redshift measurements yield a distance of 83.900 ± 4.166 Mpc (~274 million ly), which is within the Hubble distance range.[5] Note, however, that it is with the average value of independent measurements, when they exist, that the NASA/IPAC database calculates the diameter of a galaxy and that consequently the diameter of NGC 747 could be approximately 23 .9 kpc (~78,000 ly).[6] In the same area of the sky there are, among other things: the galaxies NGC 713, NGC 731, NGC 755 and NGC 767.

NGC 747
Observation data (J2000 epoch)
ConstellationCetus
Right ascension01h 57m 29s
Declination-09° 27 45″
Redshift0.0179
Apparent magnitude (B)14
Surface brightness23.05 mag/arcsec2
Other designations
PGC 7366, 2MASX J01573044-0927444, MCG -02-06-007, SDSS J015730.45-092744.5

See also

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References

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  1. ^ "NGC 747 - Spiral Galaxy in Cetus | TheSkyLive.com". theskylive.com. Retrieved 2024-04-16.
  2. ^ Astronomy, Go. "NGC 747 | galaxy in Cetus | NGC List | GO ASTRONOMY". Go-Astronomy.com. Retrieved 2024-04-16.
  3. ^ "New General Catalog Objects: NGC 700 - 749". cseligman.com. Retrieved 2024-04-25.
  4. ^ "NGC 747". simbad.cds.unistra.fr. Retrieved 2024-04-16.
  5. ^ "NGC 747". spider.seds.org. Retrieved 2024-04-16.
  6. ^ Ford, Dominic. "NGC747 (Galaxy)". In-The-Sky.org. Retrieved 2024-04-16.
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