List of stars in Lacerta
|Right ascension||22.5 h|
|Area||201 sq. deg. (68th)|
|Stars with planets||12|
|Stars brighter than 3.00m||0|
|Stars within 10.00 pc (32.62 ly)||1|
|Brightest star||α Lac (3.76m)|
|Nearest star||EV Lacertae
(16.47 ly, 5.05 pc)
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 created in 1687 by the astronomer Johannes Hevelius. Its brightest stars form a "W" shape similar to that of Cassiopeia, and it is thus sometimes referred to as 'Little Cassiopeia'. It is located between Cygnus, Cassiopeia and Andromeda on the northern celestial sphere. The northern part lies on the Milky Way.
Notable features 
Lacerta is typical of Milky Way constellations: no bright galaxies, nor globular clusters, but instead open clusters, for example NGC 7243, the faint planetary nebula IC 5271 and quite a few double stars. It also contains the prototypic blazar BL Lacertae. Lacerta contains no Messier objects.
Alpha Lacertae is a blue-white hued main-sequence star of magnitude 3.8, 102 light-years from Earth. It has a spectral type of A1 V and is an optical double star. Beta Lacertae is far dimmer, a yellow giant of magnitude 4.4, 170 light-years from Earth.
Roe 47 is a multiple star consisting of five components (magnitudes 5.8, 9.8, 10.1, 9.4, 9.8).
ADS 16402 is a binary star system in Lacerta, around which a planet orbits with some unusual properties. The Jupiter-sized planet exhibits an unexpectedly low density, about the same as cork. This planet is dubbed HAT P-1.
Deep-sky objects 
BL Lacertae is the prototype of the BL Lacertae objects, which appear to be dim variable stars but are actually the variable nuclei of elliptical galaxies; they are similar to quasars. It lent its name to a whole type of celestial objects, the BL Lacertae objects (a subtype of blazar). The object varies irregularly between magnitudes 14 and 17 over a few days.
Centred on a region of the sky without apparently bright stars, Lacerta was not regarded as a constellation by ancient astronomers. Johannes Hevelius created the constellation in 1687, though Augustin Royer created Sceptrum (the Hand of Justice and Sceptre) to honor Louis XIV in 1670 and Johann Elert Bode created Frederici Honores (Frederick's Glory) to honor Frederick the Great in 1787. Both Sceptrum and Frederici Honores are now obsolete, while Lacerta still survives.
- Ridpath, Ian; Tirion, Wil (2001), Stars and Planets Guide, Princeton University Press, ISBN 0-691-08913-2
- Ian Ridpath and Wil Tirion (2007). Stars and Planets Guide, Collins, London. ISBN 978-0-00-725120-9. Princeton University Press, Princeton. ISBN 978-0-691-13556-4.
|Wikimedia Commons has media related to: Lacerta (constellation)|
- The Deep Photographic Guide to the Constellations: Lacerta
- Star Tales – Lacerta
- Weasner's Mighty ETX Site, GO TO LACERTA (a constellation guide for amateur astronomers)