List of Triangulum's suspected satellite galaxies

The Triangulum subgroup is made up of the Triangulum Galaxy (M33) and its satellites. Although the Triangulum Galaxy does not have any proven satellite galaxies, a number of galaxies are suspected of being in the system.

Triangulum Galaxy.

Andromeda XXII

Andromeda XXII is located much closer in projection to M33 than M31 (42 kiloparsecs (140 kly) vs. 224 kiloparsecs (730 kly)). This fact suggests that it might be the first Triangulum (M33) satellite ever discovered. However, it is currently catalogued as a satellite of Andromeda (M31).[1]

Pisces Dwarf

Pisces Dwarf is an irregular dwarf galaxy that is part of the Local Group. The galaxy is also suspected of being a satellite galaxy of the Triangulum Galaxy.[2]

Andromeda II

Andromeda II is a dwarf spheroidal galaxy about 2.22 Mly away in the constellation Andromeda. It is part of the Local group of galaxies and is a satellite galaxy of the Andromeda Galaxy (M31) but it is also situated closely to the Triangulum Galaxy (M33), it is not quite clear if it is a satellite of the one or the other galaxy.

Pisces VII

Pisces VII, also known as Triangulum III, is a candidate ultra-faint dwarf galaxy in the constellation of Pisces. Its distance has been preliminarily found to be 3.3 Mly, meaning it could be associated with the Triangulum Galaxy.[3]

Data
Name Type Distance from Sun
(million ly)		 Magnitude Year
discovered
Triangulum Galaxy Spiral Sc 2.88 +6.27 1654?
Triangulum I (Andromeda XXII) 2009
Pisces Dwarf Elliptical E3 2.51 1976
Andromeda II Elliptical E3 2.13 +13 1970
Pisces VII (Triangulum III) Dwarf UFD 3.3 2021

References
  1. Nicolas F. Martin, Alan W. McConnachie, Mike Irwin, Lawrence M. Widrow, Annette M. N. Ferguson, Rodrigo A. Ibata, John Dubinski, Arif Babul, Scott Chapman, Mark Fardal, Geraint F. Lewis, Julio Navarro, R. Michael Rich; "PAndAS' cubs: discovery of two new dwarf galaxies in the surroundings of the Andromeda and Triangulum galaxies"; The Astrophysical Journal, Volume 705, Issue 1, pp. 758-765 (2009); doi:10.1088/0004-637X/705/1/758; Bibcode:2009ApJ...705..758M; arXiv:0909.0399;
  2. McConnachie, A. W.; Irwin, M. J.; Ferguson, A. M. N.; Ibata, R. A.; Lewis, G. F.; Tanvir, N. (2005). "Distances and metallicities for 17 Local Group galaxies". Monthly Notices of the Royal Astronomical Society. 356 (4): 979–997. arXiv:astro-ph/0410489. Bibcode:2005MNRAS.356..979M. doi:10.1111/j.1365-2966.2004.08514.x.
  3. Martínez-Delgado, David; Karim, Noushin; Charles, Emily J E.; Boschin, Walter; Monelli, Matteo; Collins, Michelle L M.; Donatiello, Giuseppe; Alfaro, Emilio J. (2022). "Pisces VII: Discovery of a possible satellite of Messier 33 in the DESI legacy imaging surveys". Monthly Notices of the Royal Astronomical Society. 509 (1): 16–24. arXiv:2104.03859. Bibcode:2022MNRAS.509...16M. doi:10.1093/mnras/stab2797.
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