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EntityQ660849· pop 38· linked from 349 articles

Q660849

galaxy in the constellation Pegasus

Key facts

Constellation: Pegasus
Right ascension: 22 35 51.8674
Declination: +33 ° 56 ′ 41.765 ″
Heliocentric radial velocity: 6599 ± 26 km/s
Distance: 301.7 ± 21.2 Mly (92.51 ± 6.51 Mpc )
Type: E4
Size: ~107,700 ly (33.03 kpc ) (estimated)
Apparent size v: 0.4′ x 0.4′

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Wikidata facts

Instance of: elliptical galaxy
Constellation: Pegasus
Distance from Earth: 90.59
Image: NGC 7317.jpg

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catalog code: Gaia DR2 1901636838056530176
Commons category: NGC 7317
discoverer or inventor: Édouard Stephan
time of discovery or invention: 1876-09-23
galaxy morphological type: E4
apparent magnitude: 16.74
right ascension: 338.96611739839340
declination: 33.94493298971950
redshift: 0.022012
radial velocity: 6646
epoch: J2000.0

Sources (1)

wikidata.org

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Encyclopedic overview

NGC 7317 is an elliptical galaxy that is a member of Stephan's Quintet in the constellation Pegasus. Its velocity with respect to the cosmic microwave background is 6272 ± 35 km/s, which corresponds to a Hubble distance of 301.7 ± 21.2 Mly (92.51 ± 6.51 Mpc). In addition, four non-redshift measurements give a distance of 294.27 ± 34.22 Mly (90.225 ± 10.491 Mpc). It was discovered on 27 September 1873 by French astronomer Édouard Stephan.

The SIMBAD database lists NGC 7317 as a Seyfert II Galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

Excerpted from Wikipedia’s “Q660849” article, available under the CC BY-SA 4.0 licence.

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