Features:
- the Andromeda Galaxy
because of it's low surface brightness never looks
like this in visual astronomy,
except when using a 2-meter plus telescope or a device to integrate the
radiant flux
as one observes.
The Andromeda Galaxy just looks like a
nebula in usual
visual astronomy.
- The Andromeda Galaxy and
the Moon
are never juxtaposed like this since Andromeda Galaxy is
NOT sufficiently near the ecliptic: it's at
declination (Dec or δ) +41°42'44.3''.
- Recall the Moon's angular diameter is about 0.5°
and the longest dimension of
the Andromeda Galaxy is about 3°.
- The Andromeda Galaxy at 778(17) kpc is the closest
spiral: its
de Vaucouleurs type
is SA(s)b.
- Remarkably the Andromeda Galaxy was missed by
Ptolemy (c. 90--c. 168 CE)
as a cloudy star in his
catalog of 1022 stars in 48 constellations.
He labeled 5 stars as cloudy or as
nebulae (in the historical sense)
plus one other
nebula (in the historical sense)
NOT associated with a star
(see Nebula: Observational history;
No-113,402).
- The Andromeda Galaxy
was recorded by al-Sufi (903--986)
in his Book of the Fixed Stars (circa 964)
(No-188,402),
but Tycho Brahe (1546--1601) missed it his star catalog
(No-299,308,402).
Simon Marius (1573--1624) observed it telescopically in
1612 and finally put it permanently on
historical record
(No-402).