Astrophysics (Index)About

Andromeda

(M31, Messier 31, NGC 224)
(spiral galaxy in the Local Group)

Andromeda (M31 or Messier 31, NGC 224) is a spiral galaxy about two and a half million light-years away. It is within the Local Group and is the nearest galaxy to the Milky Way that is similar: the Local Group contains one more somewhat similar spiral galaxy that is substantially smaller, and numerous smaller dwarf satellite galaxies. Andromeda is somewhat larger than the Milky Way, with on the order of a trillion stars. Andromeda was observed before the current concept of a galaxy was established, at the time, known as the Great Andromeda Nebula. Characteristics:

Some of the satellite galaxies of Andromeda are known as Andromeda I (or And I), Andromeda II, etc.


(galaxy,Local Group,spiral)
Further reading:
https://en.wikipedia.org/wiki/Andromeda_Galaxy
https://astronomy.swin.edu.au/cosmos/A/Andromeda+galaxy
http://www.messier.seds.org/m/m031.html
http://simbad.cds.unistra.fr/simbad/sim-basic?Ident=M31
https://www.messier-objects.com/messier-31-andromeda-galaxy/
http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/andromeda.html#c1
RedshiftParsecs
/Distance
Lightyears
/Lookback Years
  
.0002800kpc2.50MlyAndromeda
Coordinates:M31
J004244.3+414209
PrefixExample  
AndAnd IM31 satellites
AndromedaAndromeda IM31 satellites

Referenced by pages:
astronomical quantities
astronomical unit (AU)
Bologna Catalog of Globular Clusters (Bol)
Chandra X-ray Observatory (CXO)
constellation
galaxy classification
galaxy main sequence
galaxy merger
galaxy subgroup
Giant Stellar Stream (GSS)
globular cluster (GC)
HBK
hierarchical assembly of galaxies
hypergalaxy
Large Magellanic Cloud (LMC)
LEDA
Local Group (LG)
Local Group Galaxy Survey (LGGS)
luminous blue variable (LBV)
Messier Catalog (M)
Milkomeda
Milky Way (MW)
Morgan classification
nebula
nova (N)
PAndAS
PHAT
POINT-AGAPE
Population I (Pop I)
Population II (Pop II)
Population III (Pop III)
Principal Galaxies Catalog (PGC)
rare designator prefixes
satellite galaxy
satellite plane problem
shell galaxy
SKHB
spiral galaxy
SPLASH
stellar population
Triangulum Galaxy (M33)

Index