The Andromeda Galaxy family

The Andromeda Galaxy family

Credit: CFHT LS-PAndAS, DESI LIS, SDSS, Giuseppe Donatiello

 

The complete family of M31, with all the small satellites known so far. This poster includes Pegasus V (Andromeda XXXIV) and Pisces VII (Triangulum III) discovered by me in 2020/21.

Andromeda VIII is missing because it does not exist, And XXXI and XXXII because they are not covered by the surveys used.

For convenience, the names "Andromeda"of the galaxies is indicated as "A" with the Arabic numeral instead of the Roman one.

 

This inverted version is in full resolution. Color version g'r'(z',i') can be provided upon reasonable request.

Last update: July 7, 2024

 

 

All 42 satellite galaxies of Andromeda (M31), including M33. The list is updated to 15 December 2025.

 

Andromeda – M31 (905 o 964, Abd al-Rahmān al-Sūfi)

Triangulum – M33 (1654, G.B. Hodierna)

M32 – NGC 221 - PGC 2555 (1742, G. Le Gentil)

NGC 205 – M110 – PGC 2429 (1773, C. Messier/ 1783, C. Herschel)

NGC 185 – (1787, W. Herschel)

NGC 147 – PGC 2004 (1829, J. Herschel)

Andromeda I – PGC 4666 (1970, S. V. den Bergh)

Andromeda II - PGC 4601 (1970, S. V. den Bergh)

Andromeda III – PGC 2121 (1971, S. V. den Bergh)

 

Andromeda V - PGC 3097824 (1998, T.E. Armandroff, J.E. Davies, G.H. Jacoby)

Andromeda VI - Pegasus dwarf (1998, T.E. Armandroff et al. / Karachentsev and Karachentseva)

Andromeda VII - Cassiopeia dwarf - PGC 2807155 (1998, Karachentsev and Karachentseva)

Andromeda VIII (2003, inesistente)

Andromeda IX - PGC 4689222 (2004, D.B. Zucker, A.Y. Kniazev, E.F. Bell, D.Martinez-Delgado)

Andromeda X – (2005, D.B. Zucker, D.Martinez-Delgado, E. F. Bell)

Andromeda XI - PGC 5056923 (2006, N.F. Martin et al.)

Andromeda XII – (2006, N.F. Martin et al.)

Andromeda XIII - Pisces III (2006, N.F. Martin et al.)

Andromeda XIV – Pisces IV (2007, S. R. Majewski et al.) isolated

Andromeda XV – (2007, R. Ibata et al.)

Andromeda XVI – Pisces V (2007, R. Ibata et al.)

Andromeda XVII – (2008, M. Irwin et al.)

Andromeda XVIII – (2008, A. W. McConnachie et al.) è considerata isolata

Andromeda XIX - (2008, A. W. McConnachie et al.)

Andromeda XX - (2008, A. W. McConnachie et al.)

Andromeda XXI – (2009, N.F. Martin et al. PAndAS)

Andromeda XXII – Pisces VI/Triangulum I ((2009, N.F. Martin et al. PAndAS)

Andromeda XXIII – (2011, J.C. Richardson et al. PAndAS)

Andromeda XXIV – (2011, J.C. Richardson et al. PAndAS)

Andromeda XXV – (2011, J.C. Richardson et al. PAndAS)

Andromeda XXVI – (2011, J.C. Richardson et al. PAndAS)

Andromeda XXVII – (2011, J.C. Richardson et al. PAndAS)

Andromeda XXVIII – (2011, C.T. Slater, E.F. Bell, N.F. Martin, Sdss)

Andromeda XXIX – (2011, E.F. Bell, C.T. Slater, N.F. Martin, Sdss)

Andromeda XXX – Cassiopeia II (2013, L.L. Watkins, N.W. Evans, G. Van de Ven)

Andromeda XXXI – Lacerta I (2013, N.F. Martin et al. Pan-STARRS)

Andromeda XXXII – Cassiopeia III (2013, N.F. Martin et al. Pan-STARRS)

Andromeda XXXIII – Perseus I (2013, N.F. Martin et al.)

 

Pisces VII – Triangulum III (2020, G. Donatiello et al. DESI LIS) satellite of M33

Andromeda XXXIV / Pegasus V (2021, G. Donatiello et al. DESI LIS)

Triangulum IV (I. Ogami et al. 2024) awaiting confirmation as a possible UDG satellite of M33.

Andromeda XXXV (J. M. Arias et al. 2025).

Pegasus VII (Simon E. T. Smith et al. 2025)

 

 

 

Done