NGC 7243 (also known as Caldwell 16) is an

open cluster An open cluster is a type of star cluster made of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have been discovered within the Milky Way galaxy, and ...

and Caldwell object in the constellation

Lacerta Lacerta is one of the 88 modern constellations defined by the International Astronomical Union. Its name is Latin for lizard. A small, faint constellation, it was defined in 1687 by the astronomer Johannes Hevelius. Its brightest stars form a "W" ...

. It shines at magnitude +6.4. Its celestial coordinates are RA , dec . It is located near the naked-eye stars

Alpha Lacertae Alpha Lacertae, Latinised from α Lacertae, is a single white-hued star in the constellation of Lacerta, located 103 light-years from the Sun. It is the brightest star in Lacerta with an apparent visual magnitude of 3.76. ...

, 4 Lacertae, an A-class double star, and planetary nebula IC 5217. It lies approximately 2,800 light-years away, and is thought to be just over 100 million years old, consisting mainly of white and blue stars. NGC7243map

Notes

References

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External links

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SEDS – NGC 7243
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VizieR – NGC 7243

NED – NGC 7243
* {{DEFAULTSORT:NGC 7243 Open clusters 7243 016b Lacerta (constellation)