M-110 (NGC 205)
A 60 minute exposure with an SBIG STL-1301E
camera thru Kopernik's 20-inch RC Cassegrain working at F/5.3. The field
of view is about 20x25 arc minutes with North at the top.
Messier: (in "Observations Astronomiques,
1770-1774"; Connaissance des Tems, Paris, 1798):
'On August 10, 1773, I examined,
under a very good sky, the beautiful nebula of the girdle of Andromeda
[M31], with my achromatic refractor, which I had made to magnify 68 times,
for creating a drawing like the one of that in Orion [M42] (Mém.
de l'acad. 1771, pag. 460). I saw that nebula which C. [Citizen] Legentil
discovered on October 29, 1749 [M32]. I also saw a new, fainter one, placed
north of the great nebula, which was distant from it about 35' in right
ascension and 24' in declination. It appeared to me amazing that this faint
nebula has escaped discovery by the astronomers and myself, since the discovery
of the great nebula by Simon Marius in 1612, because when observing the
great nebula, this small one is located in the same field [of view] of
the telescope...... '
Sage, & Mitchell: (in "The
Puzzling Features of the Interstellar Medium in NGC 205"; Astrophysical
'It has long been suggested that
NGC 205 has interacted with M31 in the past.... The recent (burst of star
formation) could have been triggered by the interaction, and the blast
waves from ensuing supernovae would then have removed most of the remaining
gas. Sufficient time has passed since these events for planetary nebulae
to have contributed most of the gas we see in this galaxy.....'
NGC 205 (M110) is a dwarf
Elliptical Galaxy and is one of two companions of M-31
(the Andromeda Galaxy; also see M-32).
The well-defined nucleus contains a young stellar population, and as the
image above shows, the galaxy contains two dust patches. All of these features
are rather odd for an elliptical galaxy and probably result from a past
interaction with M-31. The galaxy has a rather low surface brightness and
can be easily missed when observing M-31 with a small backyard telescope.
M-110 & the Messier Catalog:
This object was discovered by Messier on August 10, 1773, but he never
included it in his published catalog which ended at M-102. The object was
independently discovered by Caroline Herschel in 1783. Messier did discuss
this object in an article published in 1798, and also included it in his
published sketch of M-31. However these references were forgotten until
1960 when, in his book on the Messier Objects and an article in "Sky
& Telescope", Kenneth Glyn Jones suggested that NGC 205 be included
in modern listings of the Messier Catalog as M-110 in recognition of Messier's
- M-110, NGC 205
- Magnitude: 8.9
- Constellation: Andromeda
- RA: 00h 40m 22.5s
- Dec: +41° 41' 11"
- Size (mins) 21.9' x 10.8'
- Classification: E5 pec,
Elliptical Galaxy, peculiar
George Normandin, KAS
November 25th, 2008