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Astronomical Observatory: Cool Images

Astr111 Photography Projects, Spring 2007

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M5, Amanda Meyer

Although M5 was first seen on May 5, 1702, it was not named until Charles Messier found and desribed it on May 23, 1764 as a "round nebula which doesn't contain any stars" (Messier). However, in 1791, William Herschel found that M5 did indeed contain stars, they were just hard to see because the "middle was so compressed" (Messier). With this information, it is safe to say that M5 is a globular star cluster with millions of surrounding stars. (Messier). Estimated at about 13 billion years, it is one of the oldest globular clusters known to man (Messier). This is calculated by the color of the cluster, which is a bright yellow.

M5 is streched out at location angle 50 degrees and is at a distance of 24,500 light years (Messier). It has about 23 minutes of arc, although it appears smaller (around 10 or 12 minutes of arc) (Messier). Sometimes, M5 is visable with good binoculars and can be seen as a "fuzzy patch" or a "round nebula" (Messier). With a large telescope, however, M5 can be seen clearly with tousands of stars and the halo reaching 15' in diameter (Messier). Brightest in the center, the stars make curved patterns suggesting the look of a spider's leg extending downward (according to John Mallas). M5 is easily seen near double star 5 Serpentis. Its linear size is 3.7 kly (Messier).



"Messier 5."

Ondra, Leos, "Messier 5 and its Variables."

Right Ascension (J2000) 15:18:36
Declination (J2000) +02:05:00
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 5x60 seconds
Date observed

March 3, 2007




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