In 1917, Heber Curtis had observed a nova S Andromedae within the " Great Andromeda Nebula " ( as the Andromeda Galaxy, Messier object M31, was known ).

A summary of the astrophysics of each Messier object can be found in the Concise Catalog of Deep-sky Objects.

* Messier object

In astronomy, the Pleiades ( or ) or Seven Sisters ( Messier object 45 or M45 ), is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus.

* Messier object

* Messier object

Except for the plane of our own galaxy, the brightest far-infrared object in the sky is central region of a galaxy called Messier 82.

# REDIRECT Messier object

* the Crab Nebula, also known as Messier object M1

The Dumbbell Nebula ( M27 ), is a large, bright planetary nebula which was discovered by the French astronomer Charles Messier in 1764 as the very first object of its kind.

* Messier object

* Messier object

# REDIRECT Messier object

* Messier object M33, a magnitude 7. 0 galaxy in the constellation Triangulum, also known as the Triangulum Galaxy.

* Messier object M45, a magnitude 1. 4 open cluster in the constellation Taurus, also known as the Pleiades

* Messier 102, an object listed in the Messier Catalogue that remains unidentified

# REDIRECT Messier object

This object was the first planetary nebula to be discovered ; by Charles Messier in 1764.

* Messier object M30, a magnitude 8. 5 globular cluster in the constellation Capricornus

* Messier object M40, a magnitude 9. 0 double star in the constellation Ursa Major

* Messier object M70, a magnitude 9. 0 globular cluster in the constellation Sagittarius

* Messier object M26, a magnitude 9. 5 open cluster in the constellation Scutum

* Messier object M28, a magnitude 8. 5 globular cluster in the constellation Sagittarius.

* The Messier object M27, a magnitude 7. 5 planetary nebula in the constellation Vulpecula, also known as the Dumbbell Nebula.

The Black Eye Galaxy ( also called Sleeping Beauty Galaxy ; designated Messier 64, M64, or NGC 4826 ) was discovered by Edward Pigott in March 1779, and independently by Johann Elert Bode in April of the same year, as well as by Charles Messier in 1780.

Of these, the brightest is Messier 77 ( NGC 1068 ), a 9th magnitude spiral galaxy near Delta Ceti.

Lengths with order of magnitude 1e17m: yellow Vernal Point arrow traces hundred light year radius circle with smaller ten light year circle at right ; globular cluster Messier 5 in background ; 12 light year radius Orion Nebula middle right ; 50 light year wide view of the Carina Nebula bottom left ; Pleiades cluster and Bubble nebula with similar diameters each around 10 light years bottom right ; grey arrows show distances from Sun to stars Aldebaran ( 65 light years ) and Vega ( 25 light years ).

Lengths with order of magnitude 1e18m: thousand light year radius circle with yellow arrow and 100 light year circle at right with globular cluster Messier 5 within and Carina Nebula in front ; globular cluster Omega Centauri to left of both ; part of the 1400 light year wide Tarantula Nebula fills the background.

Many of the brighter astronomical objects, such as the star clusters, nebulae and galaxies listed in the Messier Catalog, and other objects of eighth magnitude and brighter are readily viewed in hand-held binoculars in the 35 to 40 mm range, such as are found in many households for birding, hunting, and viewing sports events.

The following year, a supernova within Messier 87 reached a peak photographic magnitude of 21. 5, although this event was not reported until photographic plates were examined by the Russian astronomer Innokentii A. Balanowski in 1922.

* Messier object M88, a magnitude 11. 0 spiral galaxy in the constellation Coma Berenices

* The Messier object M69 is a magnitude 9. 0 globular cluster in the constellation Sagittarius.

* Messier object M72, a magnitude 10. 0 globular cluster in the constellation Aquarius.

* Messier object M35, a magnitude 5. 5 open cluster in the constellation Gemini

* Messier object M81, a magnitude 8. 5 spiral galaxy in the constellation Ursa Major, also known as Bode's Galaxy, and the first of what is known as the M81 Group of galaxies

* Messier object M84, a magnitude 11. 0 lenticular galaxy in the constellation Virgo

* Messier object M85 is a magnitude 10. 5 lenticular galaxy in the constellation Coma Berenices

* Messier object 79 ( M79 ), a magnitude 8. 5 globular cluster in the constellation Lepus

: Messier object M71, a magnitude 8. 5 globular cluster in the constellation Sagitta

: Messier object M73, a magnitude 9. 0 apparent open cluster in the constellation Aquarius

: Messier object M74, a magnitude 10. 5 spiral galaxy in the constellation Pisces.

* Messier 32, a magnitude 9. 0 galaxy in the constellation Andromeda which is a companion to M31.