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Encyclopedia > Lacerta
Lacerta

click for larger image This is a celestial map of the constellation of Lacerta, the Lizard. ...

Abbreviation Lac
Genitive Lacertae
Symbology the Lizard
Right ascension 22.5 h
Declination 45°
Area 201 sq. deg.
Ranked 68th
Number of stars
(magnitude < 3)
0
Brightest star α Lacertae
(App. magnitude 3.8)
Meteor showers
Bordering
constellations
Visible at latitudes between +90° and −35°
Best visible at 21:00 (9 p.m.) during the month of October

Lacerta, being Latin for Lizard, is one of the 88 official constellations acknowledged by the International Astronomical Union. It is not among Ptolemy's 48 ancient constellations. Instead it was created ca. 1687 by the astronomer Johannes Hevelius. It doesn't contain any really bright stars, no Messier object, no galaxy brighter than 14.5m, no globular clusters and not a single named star. Correspondingly it is rather difficult to find. The northern part lies on the Milky Way. Lacerta is located between Cygnus, Cassiopeia and Andromeda on the northern celestial sphere. The genitive case is a grammatical case that indicates a relationship, primarily one of possession, between the noun in the genitive case and another noun. ... This page is about Lizards, the order of reptile. ... Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... Here is a list of the 88 modern constellations by their area in the sky, measured in square degrees. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... Categories: Planetology | Astronomy stubs ... Andromeda is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in greek mythology. ... Cassiopeia is a northern constellation which greek mythology considered to represent a vain queen. ... Cepheus is a northern constellation named after a character in Greek mythology, and is considered to representing a king. ... Cygnus (Latin for swan) is a northern constellation. ... Pegasus is a northern constellation, named after the mythological Pegasus. ... October is the tenth month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days. ... Latin is the language originally spoken in the region around Rome called Latium. ... This page is about Lizards, the order of reptile. ... Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... The International Astronomical Union (IAU) unites national astronomical societies from around the world. ... Claudius Ptolemaeus, given contemporary German styling, in a 16th century engraved book frontispiece Claudius Ptolemaeus (Greek: Κλαύδιος Πτολεμαῖος; c. ... Johannes Hevelius Johannes Hevelius or Johann Hewelke or Johannes Hewel (German) (January 28, 1611–January 28, 1687) was a germanastronomer; called the founder of lunar topography. ... Charles Messier Charles Messier (June 26, 1730 – (April 12, ]) was a French astronomer who in 1774 published a catalogue of 45 deep sky objects such as nebulae and star clusters. ... This article is about a celestial body. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. ... The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Galaxia Kuklos) is the galaxy in which the Earth is found. ... Cygnus (Latin for swan) is a northern constellation. ... Cassiopeia is a northern constellation which greek mythology considered to represent a vain queen. ... Andromeda is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in greek mythology. ... In astronomy and navigation, the celestial sphere is an imaginary rotating sphere of gigantic radius, concentric with the Earth. ...

Contents


Notable features

  • α Lac: this main sequence star of spectral type A1 V has an apparent magnitude of merely 3.77m. There are no other stars brighter than fourth magnitude. α Lac is an optical double star.
  • Roe 47: a multiple star consisting of five components (magnitudes 5.8, 9.8, 10.1, 9.4, 9.8).

Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequenly refined in terms of other characteristics. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... Double Star is a science fiction novel by Robert A. Heinlein. ...

Notable deep sky objects

  • NGC 7243: an open star cluster of approximately 6.4m.
  • BL Lacertae: it was discovered quite early and first thought to be a star and therefore given a variable star designation. However, in reality it is represents the core of a galaxy. 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.

An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still gravitationally bound to each other. ... BL Lacertae is a highly variable, extragalactic AGN (Active Galactic Nuclei or Active galaxy) originally thought to be an irregular variable star in our own galaxy and so was given a variable star designation. ... Variable stars are named using a variation on the Bayer designation format of Identifier <genitive of constellation>. In previous centuries few variable stars were known, so it seemed reasonable to use the letters of the Roman alphabet, starting from the letter R so as to avoid confusion with letter spectral... A BL Lac object or BL Lacertae object or BL Lac is a type of galaxy with an active galactic nucleus (AGN), making it a type of active galaxy. ... A blazar is a galaxy with a very compact and highly variable energy source at the center of the host galaxy. ...

Mythology

Before Johannes Hevelius adopted the name Lacerta several other names had proposed for this part of the sky, among them Sceptrum (= Sceptre) and Frederick's Glory. Being a modern constellation there is no real mythology surrounding Lacerta. Sceptrum et Manus Iustitiae (Latin for scepter and hand of justice) was a constellation created by Augustin Royer in 1679 to honor king Louis XIV of France. ... Frederici Honores or Honores Friderici or Gloria Frederici (Latin for Glory of Frederick) was a constellation created by Johann Bode in 1787 to honor Frederick the Great, the king of Prussia who had died in the previous year. ...


Table of leading stars

This table lists all stars in Lacerta with either a Bayer designation or Flamsteed designation, or that are of magnitude 4.50 or brighter. Many of the brighter stars are given names which are known as Bayer designations. ... Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek letters. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ...

Bayer designation Flamsteed designation Variable designation Other designations Right ascension Declination Magnitude
ADS 15758 22h 13m 52.7s +39° 42′ 52″ 4.49
1 22h 15m 58.2s +37° 44′ 56″ 4.13
2 ADS 15862 22h 21m 01.6s +46° 32′ 12″ 4.57
β 3 22h 23m 33.6s +52° 13′ 45″ 4.43
4 22h 24m 31.0s +49° 28′ 35″ 4.57
5 22h 29m 31.8s +47° 42′ 25″ 4.36
6 22h 30m 29.3s +43° 07′ 24″ 4.51
α 7 ADS 16021 22h 31m 17.5s +50° 16′ 57″ 3.77
8 ADS 16095 22h 35m 52.3s +39° 38′ 03″ 5.73
9 22h 37m 22.4s +51° 32′ 43″ 4.63
10 ADS 16148 22h 39m 15.7s +39° 03′ 01″ 4.88
11 22h 40m 30.9s +44° 16′ 35″ 4.46
12 DD 22h 41m 28.6s +40° 13′ 32″ 5.25v
13 ADS 16227 22h 44m 05.5s +41° 49′ 09″ 5.08
14 V360 22h 50m 21.8s +41° 57′ 13″ 5.92v
15 ADS 16325 22h 52m 02.0s +43° 18′ 45″ 4.94
16 EN ADS 16381 22h 56m 23.6s +41° 36′ 14″ 5.59v

Source: The Bright Star Catalogue, 5th Revised Ed. Right ascension (RA; symbol α: Greek letter alpha) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ...


Lacerta in fiction

In the Science Fiction novel Diaspora by Greg Egan, the constellation Lacerta was the origin of a massive shock wave, caused by the collision of two neutron stars, which caused the extinction of most life on Earth. Science fiction is a form of speculative fiction principally dealing with the impact of imagined science and technology, or both, upon society and persons as individuals. ... Diaspora is a 1997 science fiction novel by Australian writer Greg Egan. ... Greg Egan (born August 20, 1961) is an Australian (Perth-based) computer programmer and science fiction author. ... Cross section of a neutron star A neutron star is a type of degenerate star composed mostly of densely packed neutrons, generally about 20 km in diameter and as massive as an average star. ...


Stars

Stars with Bayer designations:
7/α Lac 3.76; 3/β Lac 4.42
Stars with Flamsteed designations:
1 Lac 4.14; 2 Lac 4.55; 4 Lac 4.55; 5 Lac 4.34; 6 Lac 4.52; 8 Lac – double 5.73, 6.60; 9 Lac 4.64; 10 Lac 4.89; 11 Lac 4.50; 12 Lac 5.25; 13 Lac 5.11; 14 Lac 5.91; 15 Lac 4.95; 16 Lac 5.60

External links

Commons
Wikimedia Commons has more media related to:
Lacerta
  • The Deep Photographic Guide to the Constellations: Lacerta
  • Weasner's Mighty ETX Site, GO TO LACERTA (a constellation guide for amateur astronomers)


Wikipedia does not have an article with this exact name. ... The Wikimedia Commons (also called Commons or Wikicommons) is a repository of free content images, sound and other multimedia files. ...

Constellations introduced by Johannes Hevelius in the 1690 text Firmamentum Sobiescianum Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long). ... Johannes Hevelius Johannes Hevelius or Johann Hewelke or Johannes Hewel (German) (January 28, 1611–January 28, 1687) was a germanastronomer; called the founder of lunar topography. ... Events Giovanni Domenico Cassini observes differential rotation within Jupiters atmosphere. ...

Canes Venatici | Lacerta | Leo Minor | Lynx | Scutum | Sextans | Vulpecula


Canes Venatici (Latin for hunting dogs) is a small northern constellation that was introduced by Johannes Hevelius in the 17th century. ... Leo Minor (Latin for Small Lion) is a rather dim constellation that can - barely - be recognized as a triangle and lies between the easily discerned constellations Ursa Major and Leo. ... Lynx is a constellation of the northern hemisphere, introduced in the 17th century by Johannes Hevelius. ... Scutum (Latin for shield) is a small constellation. ... For the Ancient Roman coin denomination, see sextans (coin). ... Vulpecula, being Latin for Fox, is a faint northern constellation located in the middle of the Summer Triangle, an asterism consisting of the bright stars Deneb, Vega and Altair. ...

The 88 modern Constellations
Andromeda | Antlia | Apus | Aquarius | Aquila | Ara | Aries | Auriga | Boötes | Caelum | Camelopardalis | Cancer | Canes Venatici | Canis Major | Canis Minor | Capricornus | Carina | Cassiopeia | Centaurus | Cepheus | Cetus | Chamaeleon | Circinus | Columba | Coma Berenices | Corona Australis | Corona Borealis | Corvus | Crater | Crux | Cygnus | Delphinus | Dorado | Draco | Equuleus | Eridanus | Fornax | Gemini | Grus | Hercules | Horologium | Hydra | Hydrus | Indus | Lacerta | Leo | Leo Minor | Lepus | Libra | Lupus | Lynx | Lyra | Mensa | Microscopium | Monoceros | Musca | Norma | Octans | Ophiuchus | Orion | Pavo | Pegasus | Perseus | Phoenix | Pictor | Pisces | Piscis Austrinus | Puppis | Pyxis | Reticulum | Sagitta | Sagittarius | Scorpius | Sculptor | Scutum | Serpens | Sextans | Taurus | Telescopium | Triangulum | Triangulum Australe | Tucana | Ursa Major | Ursa Minor | Vela | Virgo | Volans | Vulpecula

  Results from FactBites:
 
Lacerta homepage (641 words)
Lacerta is een Nederlandse vereniging die zich bezighoudt met reptielen en amfibieën.
Lacerta 65-3 is nu bij de drukker en verschijnt naar verwachting in de laatste week van september.
Een voorproefje van Lacerta (uitgave 63/3) is beschikbaar voor mensen die het blad nog niet kennen.
Lacerta (393 words)
Lacerta, is one of seven constellations introduced by Johannes Hevelius.
His stellar observations were the most accurate to his time, and for that reason the celestial atlas was a remarkable achievement.
The binary is 1.5 degrees SE of 2 Lacerta, along a line between 2 Lac and 6 Lac.
  More results at FactBites »

 
 

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