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NGC 6621 is the larger of the two, and is a very disturbed spiral galaxy. The encounter has pulled a long tail out of NGC 6621 that has now wrapped at the north behind its body. The collision has also triggered extensive star formation between the two galaxies. The most intense star formation takes place in the region between the two nuclei, where a large population of luminous clusters, also known as super star clusters, has been observed. At this region is observed the most tidal stress. Many large clusters are also observed in the tail and the nucleus of NGC 6621. The brightest and bluest clusters are less than 100 million years old, with the youngest being less than 10 million years old. The side of the galaxy further from the companion features noticeably less star formation activity.
NGC 6621 is characterised as a luminous infrared galaxy, with its infrared luminosity being 10 L☉. NGC 6621 contributes nearly all of the radio and far infrared flux of the pair. When observed in H-alpha, the centre of the galaxy has two bright sources separated by 3 arcseconds, with the southwest being brighter while the northeastern one coincides with the nucleus of NGC 6621.
Two supernovae have been detected in NGC 6621. The first, SN 2010hi (type unknown, mag. 18), was discovered on 1 September 2010, lying 30" east and 4" north of the center of the galaxy. The second, SN 2019hsx (type Ic-BL, mag. 18.6), was discovered on 2 June 2019.
Hattori, T.; Yoshida, M.; Ohtani, H.; Sugai, H.; Ishigaki, T.; Sasaki, M.; Hayashi, T.; Ozaki, S.; Ishii, M.; Kawai, A. (February 2004). "A Study of the Distribution of Star-forming Regions in Luminous Infrared Galaxies by Means of H Imaging Observations". The Astronomical Journal. 127 (2): 736–757. arXiv:astro-ph/0311179. Bibcode:2004AJ....127..736H. doi:10.1086/381060. S2CID18181421.
"SUPERNOVA 2010hi IN NGC 6621". Central Bureau for Astronomical Telegrams. International Astronomical Union. 3 September 2010.
"SN 2019hsx". Transient Name Server. IAU. Retrieved 6 September 2024.
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Hubble Space Telescope image of NGC 6621 (center) and NGC 6622 (left)
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