Cetus III (dwarf galaxy)

Cetus lll
Cetus lll
Observation data
Constellation	Cetus
Distance	818,652 ly
Group or cluster	Milky Way subgroup
Characteristics
Type	Ultra-faint dwarf
Half-light radius (physical)	90

Last updated July 29, 2025

Cetus lll is an ultra-faint dwarf galaxy (UFD) that is a satellite galaxy to the Milky Way. It is located at a distance of 251 kiloparsecs in the constellation of Cetus. It has a half-light radius of 90 parsecs.^[1]

It was identified as a statistically significant overdensity of stars by the Subaru/Hyper Suprime-Cam Survey. It’s small size made it invisible to the Sloan digital sky survey.^[1]

References

1 2 Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako; Komiyama, Yutaka; Tanaka, Masayuki; Tanaka, Mikito; Ishigaki, Miho N.; Hayashi, Kohei; Arimoto, Nobuo; Garmilla, José A.; Lupton, Robert H.; Strauss, Michael A.; Miyazaki, Satoshi; Wang, Shiang-Yu; Murayama, Hitoshi (January 2018). "Searches for new Milky Way satellites from the first two years of data of the Subaru/Hyper Suprime-Cam survey: Discovery of Cetus III". Publications of the Astronomical Society of Japan. 70: S18. doi:10.1093/pasj/psx050. ISSN 0004-6264.

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[:0-1] 1 2 Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako; Komiyama, Yutaka; Tanaka, Masayuki; Tanaka, Mikito; Ishigaki, Miho N.; Hayashi, Kohei; Arimoto, Nobuo; Garmilla, José A.; Lupton, Robert H.; Strauss, Michael A.; Miyazaki, Satoshi; Wang, Shiang-Yu; Murayama, Hitoshi (January 2018). "Searches for new Milky Way satellites from the first two years of data of the Subaru/Hyper Suprime-Cam survey: Discovery of Cetus III". Publications of the Astronomical Society of Japan. 70: S18. doi:10.1093/pasj/psx050. ISSN 0004-6264.

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