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Encyclopedia > Norma (constellation)
Norma
Norma
Click for larger image
Abbreviation: Nor
Genitive: Normae
Symbology: the Normal
Right ascension: 16.05 h
Declination: −52.01°
Area: 165 sq. deg. (74th)
Main stars: 2
Bayer/Flamsteed stars: 13
Stars with known planets: 0
Bright stars: 0
Nearby stars: 0
Brightest star: γ2 Nor (4.0m)
Nearest star: HD 139211 (101 ly)
Messier objects: 0
Meteor showers: Gamma Normids
Bordering constellations: Scorpius
Lupus
Circinus
Triangulum Australe
Ara
Visible at latitudes between +30° and −90°
Best visible at 21:00 (9 p.m.) during the month of July

Norma (IPA: /ˈnɔːmə/, Latin: normal, as in right angle), is a small and inconspicuous [penis] that lies in the southern hemisphere between Scorpius and Centaurus. The Milky Way passes through it. In English the constellation is variously known as The Rule, The Carpenter's Square, The Set Square and The Level. It was formally known as Norma et Regula, a Latin translation of Lacaille's original French name for the constellation, L'Équerre et La Règle, meaning "The Set Square and The Ruler". This is a celestial map of the constellation Norma, the Level. ... 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. ... A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. ... Equatorial Coordinates Right ascension (abbrev. ... In astronomy, declination (abbrev. ... Here is a list of the 88 modern constellations by their area in the sky, measured in square degrees. ... 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. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance light travels in vacuum in one Julian year. ... The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... Leonid Meteor Shower A meteor shower, also known as a meteor storm, is a celestial event where a large number of meteors are seen within a very short period. ... Scorpius (Latin for scorpion, symbol , Unicode ♏) is one of the constellations of the zodiac. ... Lupus (Latin for Wolf) is a southern constellation. ... Circinus, Latin for Compass, is one of the small southern (declination −50 to −60 degrees) constellations. ... Triangulum Australe is a small southern constellation whose three brightest stars, of second and third magnitude, form an approximately equilateral triangle. ... Ara (Latin for Altar) is a faint southerly constellation between the constellations Centaurus and Lupus. ... For information on how to read IPA transcriptions of English words see here. ... Latin was the language originally spoken in the region around Rome called Latium. ... A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. ... A surface normal, or just normal to a flat surface is a three-dimensional vector which is perpendicular to that surface. ... Scorpius (Latin for scorpion, symbol , Unicode ♏) is one of the constellations of the zodiac. ... Centaurus (Latin for centaur) was one of the 48 constellations listed by Ptolemy, and counts also among the 88 modern constellations. ... It has been suggested that Andromeda-Milky Way collision be merged into this article or section. ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Abbé Nicolas Louis de Lacaille (March 15, 1713 – March 21, 1762) was a French astronomer. ... triangle, set square In American English, a set square is an alternative name for a T-square. ... A ruler is an instrument used in geometry and technical drawing to measure short distances and/or to rule straight lines. ...

Contents

Notable features

Norma has no α or β star; its brightest star, γ2 Normae, is only of magnitude 4.0. Among the constellation's principal stars are the following: // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ...

  • γ1 Nor and γ2 Nor comprise an easy optical double. γ2 Nor is itself a close optical double (HJ 4841).
  • ε Nor: a relatively fixed binary star (HJ 4853). The two components are of magnitude 4.54 and 6.68; the separation is 22" in PA 335°. The fainter component is itself a spectroscopic binary (mag 6.68 and 7.12).
  • ι1 Nor: a multiple star. The AB (mag 5.6 and 5.8) pair comprise a rapid binary with a period of 26.9 years; in 2000 the separation was 0.5" in PA 285°. Component C, of magnitude 8.75, is 11" away in PA 242°; it is not a physical member of the system, being only 55 light-years away, while the AB pair lie at a distance of more than 140 ly.
  • μ Nor is suspected of being an Alpha Cygni variable, with a range of 4.87–4.98. It is of spectral type O9.7 Iab.
  • R Normae is a Mira variable. Its visual range is 6.5–13.9 and its average period is 507.5 days.
  • S Normae is a well-known Cepheid variable with a range of 6.12–6.77 and a period of 9.75411 days. It is located at the centre of the open cluster NGC 6087.

When two stars are so nearly in the same direction as seen from Earth that they appear to be a single star to the naked eye but may be separated by the use of telescopes, they are referred to as a double star. ... This article is about the astronomical phenomenon. ... Alpha Cygni variables are variable stars which exhibit non-radial pulsations. ... Mira variables, named after the star Mira (IPA [ˈmai. ... Cepheid in the Spiral Galaxy M100 A Cepheid variable or Cepheid is a member of a particular class of variable stars, notable for a fairly tight correlation between their period of variability and absolute luminosity. ... The Pleiades is one of the most famous open clusters. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ...

Notable deep-sky objects

Due to its location on the Milky Way, this constellation contains many deep sky objects, the most notable of which is NGC 6087. Deep sky object (DSO) is a term used often in amateur astronomy to denote objects in the night sky other than solar system objects (such as planets, comets and asteroids), single stars and multiple star systems. ...

  • NGC 6067 is an open cluster, which lies less than 1° north of Kappa Normae. It contains about 100 stars of the tenth magnitude and has an integrated magnitude of 5.6m.
  • NGC 6087 is the brightest of the open clusters in Norma; it lies in the southeastern corner of the constellation between α Centauri and ζ Arae. It is about 3500 light-years away and contains about 40 stars of the seventh to the eleventh magnitude. Its brightest member is the Cepheid variable S Normae. It is of magnitude +5.4.
  • Sp 1 (or PK 329+02.1) is a planetary nebula better known as the Fine-Ring Nebula. It lies about five degrees west-northwest of γ1 Nor, though its actual distance has been variously estimated at 1000–4700 ly. Its integrated magnitude is 13.6 and its mean surface brightness is 13.9. The central star is a white dwarf of mag 14.03.

The Pleiades is one of the most famous open clusters. ... The Pleiades is one of the most famous open clusters. ... Alpha Centauri (α Cen / α Centauri) is the brightest star system in the southern constellation of Centaurus. ... Zeta Arae (ζ Ara / ζ Arae) is a star in the constellation Ara. ... Cepheid in the Spiral Galaxy M100 A Cepheid variable or Cepheid is a member of a particular class of variable stars, notable for a fairly tight correlation between their period of variability and absolute luminosity. ... NGC 6543, the Cats Eye Nebula A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. ... Surface brightness is a concept used in astronomy when describing extended astronomical objects such as galaxies and nebulae. ... This article or section does not adequately cite its references or sources. ...

History

This constellation was named by Nicolas Louis de Lacaille during his stay at the Cape of Good Hope from 1751 to 1752. He originally called it Norma et Regula (the Normal (a Set Square) and the Ruler (a Level) ), referring to the carpenter's tools. The constellation had previously been called the Southern Triangle (no relation to Triangulum Australe) and Quadrans Euclidis (Euclid's square). Since it lies in the south, and was created in the 17th century, this constellation has no early or classical mythology associated with it. Abbé Nicolas Louis de Lacaille (March 15, 1713 – March 21, 1762) was a French astronomer. ... The Cape of Good Hope; looking towards the west, from the coastal cliffs above Cape Point. ... A surface normal, or just normal to a flat surface is a three-dimensional vector which is perpendicular to that surface. ... triangle, set square In American English, a set square is an alternative name for a T-square. ... A ruler is an instrument used in geometry and technical drawing to measure short distances and/or to rule straight lines. ... A straightedge is a tool similar to a ruler, but without markings. ... Carpenters in an Indian village. ... Triangulum Australe is a small southern constellation whose three brightest stars, of second and third magnitude, form an approximately equilateral triangle. ... Euclid(Greek: ), also known as Euclid of Alexandria, was a Greek mathematician who flourished in Alexandria, Egypt, almost certainly during the reign of Ptolemy I (323–283 BC). ...


Changes in the boundaries of the constellations since Lacaille’s time have resulted in the removal of a number of bright stars from Norma. In particular, the stars that Lacaille designated α and β have been transferred to Scorpius and are now known as N Scorpii and H Scorpii respectively. Scorpius (Latin for scorpion, symbol , Unicode ♏) is one of the constellations of the zodiac. ...


See also

This is the list of notable stars in the constellation Norma, sorted by decreasing brightness. ...

References

  • Burnham, Robert Jr. (1966, 1978). Burnham's Celestial Handbook: An Observer's Guide to the Universe Beyond the Solar System, v.2. General Publishing Company, Ltd., Toronto. ISBN 0-486-23568-8. 

External links

Wikimedia Commons has media related to:
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:
 
Norma Constellation (0 words)
The small constellation of Norma lying in the central regions of the Milky Way, and in fact giving its name to one of our Galaxy's minor spiral arms.
R Normae is a Mira-type variable: 6.5-13.9, with a period of 507.5 days.
S Normae is a well-known cepheid with a range from 6.1 to 6.8 magnitude, every 9.75 days.
Star Tales – Norma (351 words)
On the 1763 edition of the planisphere the name of the constellation was Latinized and shortened to Norma, meaning set square, although others continued to call it Norma et Regula, as did Bode on his atlas of 1801.
Allen seemingly misread the French map and transferred the name to the wrong constellation, in a reprise of the way in which star names were misapplied through misreadings of maps down the ages.
Incidentally, Norma shares this distinction with Puppis and Vela, both of which lack stars labelled Alpha and Beta because they were once part of the much larger constellation Argo Navis; when Argo was split into three by Lacaille, the stars Alpha and Beta ended up in the third subdivision, Carina.
  More results at FactBites »

 
 

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