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NGC 7318
NGC 7318 imaged by the Hubble Space Telescope. 8-micrometre infrared light = red, H-alpha = green, visible red light = blue. NGC 7318b is the upper galaxy, NGC 7318a is the lower galaxy.
Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	22 35 56.7 / 22 35 58.4
Declination	+33° 57′ 56″ / +33° 57′ 57″
Redshift	6630 ± 23 / 5774 ± 24 km/s
Distance	85 Mpc
Apparent magnitude (V)	14.4 / 13.9
Characteristics
Type	E2 pec / SB(s)bc pec
Apparent size (V)	0.9′ × 0.9′ / 1.9′ × 1.2′
Notable features	Colliding galaxies
Other designations
NGC 7318A / 7318B UGC 12099 / 12100 Arp 319 PGC 69260 / 69263 HCG 92D / 92B
References:

NGC 7318 (also known as UGC 12099/UGC 12100 or HCG 92d/b) is a pair of colliding galaxies about 280 million light-years from Earth. They appear in the Constellation Pegasus and are members of Stephan's Quintet. They were discovered on 27 September 1873 by French astronomer Édouard Stephan.

The Spitzer Space Telescope revealed the presence of a large intergalactic shock wave, shown by an arc produced by NGC 7318b colliding with the group at ≥ 900 km/sec.

As NGC 7318b collides with NGC 7318a, atoms of hydrogen in the cluster's gas are heated by the shock wave, producing the green glow. The molecular hydrogen visible in the collision is one of the most turbulent forms known. This phenomenon was discovered by an international team of scientists of the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg. This collision can help provide a view into what happened in the early universe, around ten billion years ago.

See also

• List of NGC objects (7001–7840)

References

1. ^ Duc, Pierre-Alain; Cuillandre, Jean-Charles; Renaud, Florent (March 2018). "Revisiting Stephan's Quintet with deep optical images". Monthly Notices of the Royal Astronomical Society: Letters. 475 (1): L40–L44. arXiv:1712.07145. Bibcode:2018MNRAS.475L..40D. doi:10.1093/mnrasl/sly004.
2. "NASA/IPAC Extragalactic Database". Results for NGC 7318a / 7318b. Retrieved 2006-10-23.
3. Arp, Halton (July 1973). "Stephan's Quintet of Interacting Galaxies". Astrophysical Journal. 183: 411–440. Bibcode:1973ApJ...183..411A. doi:10.1086/152236. Retrieved 9 February 2021.
4. Seligman, Courtney. "New General Catalogue Objects: NGC 7318". Celestial Atlas. Retrieved 28 August 2024.
5. Xu, C. K.; Appleton, P. N.; Dopita, M.; Gao, Y.; Lu, N. Y.; Popescu, C.; Reach, W. T.; Sulentic, J.; Tuffs, R.; Yun, M. (March 2008). "Spitzer Observations of Stephan's Quintet -- IGM Dust and Gas in a Multi-galaxy Collision". The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series. 381: 88. Bibcode:2008ASPC..381...88X. Retrieved 9 February 2021.

External links

• Media related to NGC 7318 at Wikimedia Commons
• Hickson 92 in Pegasus
• SIMBAD: VV 288 -- Interacting Galaxies
• SIMBAD: UGC 12100—Interacting Galaxies

v t e Constellation of Pegasus
Pegasus in Chinese astronomy List of stars in Pegasus
Stars	Bayer α (Markab) β (Scheat) γ (Algenib) δ (Alpheratz) ε (Enif) ζ (Homam) η (Matar) θ (Biham) ι κ λ μ (Sadalbari) ν ξ ο π π ρ σ τ (Salm) υ (Alkarab) φ χ ψ Flamsteed 1 2 3 4 5 7 9 11 12 13 14 15 16 17 18 19 20 21 23 25 28 30 31 32 33 34 35 36 37 38 39 40 41 45 51 (Helvetios) 52 55 56 57 58 59 60 61 63 64 65 66 67 69 70 71 72 73 74 75 76 77 78 79 80 82 83 85 86 87 23 Psc 34 Vul Variable R S U W Z RU RV RZ SV TW TY AG AQ AT AU AV AW BB BH BK BO BP BX BY DH DI DY EE EF EQ EZ GT GX HN HO HP HR HX II IK IM IP KT KU LL LO LS MS MT NV NZ OY PT V342 V343 V354 V363 V372 V376 V391 HR 19 49 8116 8219 8221 8231 8250 8257 8258 8274 8292 8325 8341 8348 8358 8359 8364 8372 8391 8397 8412 8415 8435 8441 8455 8456 8458 8460 8461 8466 8475 8482 8491 8503 8514 8543 8555 8564 8587 8604 8605 8608 8631 8638 8642 8737 8784 8788 8792 8824 8831 8833 8838 8839 8873 8922 8942 8953 8970 9039 9055 9078 9109 HD 434 204603 205011 205422 205603 206689 206793 208897 209709 210890 211076 213025 215549 215733 219196 219828 220288 220773 221170 221493 225292 Other BD+14 4559 (Solaris) BD +17 4708 BD +28 4211 GD 246 Gl 829 Gl 880 HAT-P-8 NGC 8 NGC 18 NGC 30 PG 2131+066 PG 2303+243 PSR B2127+11C PSR B2303+30 Q2343-BX418 WASP-10 WASP-21 (Tangra) WASP-52 (Anadolu) WASP-59 WASP-60 (Morava) X2127+119 3C 454.3
Exoplanets 51 Pegasi b (Dimidium) WASP-10b BD+14 4559 b (Pirx) TOI-5678 b HD 209458 b HR 8799 b c d e
Star clusters	Other Balbinot 1 Messier 15
Nebulae	Other Pease 1
Galaxies	NGC 1 2 9 14 15 16 22 23 26 41 42 52 7033 7034 7042 7043 7053 7056 7066 7068 7074 7085 7190 7217 7236 7237 7303 7312 7315 7317 7318 7319 7320 7320c 7331 7332 7427 7448 7454 7457 7466 7469 7479 7610 7619 7625 7673 7674 7678 7720 7726 7735 7741 7742 NGC 7752 NGC 7753 7767 7769 7773 7800 7814 Other BX442 CTA-102 Einstein Cross Huchra's lens IC 5145 IC 5337 Markarian 335 Pegasus Dwarf Irregular Galaxy Pegasus Dwarf Spheroidal Galaxy Q2343-BX418
Galaxy clusters Abell 2390 NGC 7331 Group Stephan's Quintet
Astronomical events SN 1990U SN 2008ha SN 2013fs
Category

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• Barred spiral galaxies
• Interacting galaxies
• Elliptical galaxies
• Peculiar galaxies
• Stephan's Quintet
• Pegasus (constellation)
• NGC objects
• UGC objects
• Principal Galaxies Catalogue objects
• Arp objects
• Discoveries by Édouard Stephan
• Astronomical objects discovered in 1873
• Galaxy mergers
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