NGC 7243 (also known as Caldwell 16) is an open cluster and Caldwell object in the constellation Lacerta. It shines at magnitude +6.4. Its celestial coordinates are RA 22^h 15.3^m , dec +49° 53′. It is located near the naked-eye stars Alpha Lacertae, 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.[1]

NGC 7243
NGC 7243
Observation data (2000.0 epoch)
Constellation	Lacerta
Right ascension	22h 15m 08.6s
Declination	+49° 53′ 51″
Distance	2800 (860)
Apparent magnitude (V)	+6.4
Apparent dimensions (V)	21′
Physical characteristics
Other designations	Caldwell 16, Cr 448
See also: Open cluster, List of open clusters

Notes

References

• Pasachoff, Jay M. (2000). "Atlas of the Sky". Stars and Planets. New York, NY: Peterson Field Guides. p. 578. ISBN 978-0-395-93432-6.
• Caldwell-Moore, Sir Patrick (2003). Firefly Atlas of the Universe. Firefly Books Limited. ISBN 978-1-55297-819-1.

External links

• Media related to NGC 7243 at Wikimedia Commons
• SEDS – NGC 7243
• "NGC 7243". SIMBAD. Centre de données astronomiques de Strasbourg.
• VizieR – NGC 7243
• NED – NGC 7243
• NGC 7243 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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