Aquarius III (galaxy)

Aquarius lll
Aquarius lll
	Artistic illustration of the halo of the Milky Way galaxy which Aquarius lll is located in
Observation data
Constellation	Aquarius
Distance	277,232 ly
Characteristics
Type	Dwarf galaxy
Notable features	Metal poor stars

Last updated August 07, 2025

Aquarius lll is an ultra-faint satellite dwarf galaxy located in the outer halo around 85 kiloparsecs from the Milky Way galaxy in the constellation of Aquarius. The stars within Aquarius lll are extremely metal poor.^[1] It could have at least one RR Lyrae star.^[2]

The galaxy is possibly on its first in fall to the galaxy. Notably, unlike other satellite galaxies orbiting the Milky Way galaxy, it had not experienced significant tidal disruption from the galactic disk.^[1]

References

1 2 Cerny, W.; Chiti, A.; Geha, M.; Mutlu-Pakdil, B.; Drlica-Wagner, A.; Tan, C. Y.; Adamów, M.; Pace, A. B.; Simon, J. D. (1 October 2024), "Discovery and Spectroscopic Confirmation of Aquarius III: A Low-Mass Milky Way Satellite Galaxy", The Astrophysical Journal, 979 (2): 164, arXiv: 2410.00981 , Bibcode:2025ApJ...979..164C, doi: 10.3847/1538-4357/ad8eba
↑ Ngeow, Chow-Choong; Bhardwaj, Anupam (March 2025). "Candidate RR Lyrae Associated with the Ultrafaint Dwarf Galaxy Aquarius III". The Astronomical Journal. 169 (3): 156. Bibcode:2025AJ....169..156N. doi: 10.3847/1538-3881/adadf1 . ISSN 0004-6256.

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[:0-1] 1 2 Cerny, W.; Chiti, A.; Geha, M.; Mutlu-Pakdil, B.; Drlica-Wagner, A.; Tan, C. Y.; Adamów, M.; Pace, A. B.; Simon, J. D. (1 October 2024), "Discovery and Spectroscopic Confirmation of Aquarius III: A Low-Mass Milky Way Satellite Galaxy", The Astrophysical Journal, 979 (2): 164, arXiv: 2410.00981 , Bibcode:2025ApJ...979..164C, doi: 10.3847/1538-4357/ad8eba

[2] Ngeow, Chow-Choong; Bhardwaj, Anupam (March 2025). "Candidate RR Lyrae Associated with the Ultrafaint Dwarf Galaxy Aquarius III". The Astronomical Journal. 169 (3): 156. Bibcode:2025AJ....169..156N. doi: 10.3847/1538-3881/adadf1 . ISSN 0004-6256.

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