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Messier 70

Globular cluster in the constellation Sagittarius

Field	Value
name	Messier 70
image	[[Image:Messier70-HST-Potw1215a.jpg	300px]]
caption	Globular cluster Messier 70 by Hubble Space Telescope; 3.3 view
epoch	J2000
class	V
constellation	Sagittarius
ra
dec
dist_ly	29.4 kly
appmag_v	7.9
size_v
mass_msol
radius_ly	34 ly
radius_tidal_arcminsec
metal_fe	–1.35
age	12.80 Gyr
names	GCl 101, M70, NGC 6681

Messier 70 or M70, also known as NGC 6681, is a globular cluster of stars to be found in the south of Sagittarius. It was discovered by Charles Messier in 1780. The famous comet Hale–Bopp was discovered near this cluster in 1995.

It is about 29,400 light years away from Earth and around 2 kpc from the Galactic Center. It is roughly the same size and luminosity as its neighbour in space, M69. M70 has a very small core radius of 0.068 pc and a half-light radius of 55.80 pc. This cluster has undergone core collapse, leaving it centrally concentrated with the luminosity distribution following a power law.

There are two distinct stellar populations in the cluster, with each displaying unique abundances. These likely represent different generations of stars. Five known variable stars lie within its broadest radius, the tidal radius, all of which are RR Lyrae variables. The cluster may have two blue stragglers near the core.

Gallery

File:Messier 70 Hubble WikiSky.jpg|Image by Hubble Space Telescope File:M70map.png|Map showing M70, against a conventional (southern) horizon

References and footnotes

| access-date=2018-12-04 | postscript=. }}

| editor1-first=S. G. | editor1-last=Djorgovski | editor2-first=G. | editor2-last=Meylan

| display-authors=1 | postscript=.

| display-authors=1

| display-authors=1 | journal=The Astronomical Journal

| access-date=2006-11-17 }}

| display-authors=1 | journal=The Astrophysical Journal

References

"Messier 70".
distance × sin( diameter_angle / 2 ) = 34 ly. radius

Info: Wikipedia Source

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globular-clusters sagittarius-(constellation) messier-objects ngc-objects astronomical-objects-discovered-in-1780 discoveries-by-charles-messier

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