Octans
Octans
Constellation
Octans
List of stars in Octans
Abbreviation Oct
Genitive Octantis
Pronunciation /ˈɒktænz/, genitive /ɒkˈtæntɨs/
Symbolism the Octant
Right ascension 22 h
Declination −90°
Quadrant SQ4
Area 291 sq. deg. (50th)
Main stars 3
Bayer/Flamsteed
stars
27
Stars with planets 2
Stars brighter than 3.00m 0
Stars within 10.00 pc (32.62 ly) 1
Brightest star ν Oct (3.73m)
Nearest star LHS 531
(28.11 ly, 8.62 pc)
Messier objects none
Meteor showers none
Bordering
constellations
Tucana
Indus
Pavo
Apus
Chamaeleon
Mensa
Hydrus
Visible at latitudes between +0° and −90°.
Best visible at 21:00 (9 p.m.) during the month of October.
Circumpolar.

Octans is a faint constellation the southern sky. Its name is Latin for the eighth part of a circle, but it is named after the octant, a navigational instrument. The constellation was devised by Nicolas Louis de Lacaille in the eighteenth century.

Octans is notable as the location of the south celestial pole. Unlike the north pole, it has no bright pole star: Sigma Octantis (σ Oct) is a naked-eye star very close to the pole, but it is so faint (mag. 5.6) that it is practically useless for navigation purposes. Conviently for navigators, the constellation Crux, the Southern Cross, points toward the pole.

The constellation is circumpolar to the south celestial pole, so it can be seen in Southern Hemisphere skies during the evening in any month of the year. The Right Ascension and month of best visibility given are for the three brightest stars, which are at their highest in the sky during the evening in November.

Octans as the name

USS Octans (AF-26) was once a United States Navy ship.

References

External links


Coordinates: Sky map 22h 00m 00s, −90° 00′ 00″


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Look at other dictionaries:

  • Octans — Nombre Latino Octants Abreviatura Oct …   Wikipedia Español

  • Octans — [äk′tanz] n. [ModL: see OCTANT] a S constellation containing the celestial pole …   English World dictionary

  • Octans — Daten des Sternbildes Oktant Deutscher Name Oktant Lateinischer Name Octans Lateinischer Genitiv Octantis Lateinische Abkürzung Oct Rektaszension 0h bis 24h Deklination …   Deutsch Wikipedia

  • Octans — /ˈɒktænz/ (say oktanz) noun (genitive Octantis /ɒkˈtæntəs/ (say ok tantuhs)) a faint, southern constellation; south celestial pole is situated here. {New Latin Octans (Hadleianus) (Hadley s) octant; coined by N de La Caille, 1713–62, in… …   Australian English dictionary

  • Octans — /ok tanz/, n., gen. Octantis /ok tan tis/. Astron. the Octant, a southern constellation that contains the south celestial pole. [ < LL: eighth part of a circle, equiv. to oct OCT + ans, as in quadrans QUADRANT] * * * …   Universalium

  • Octans — noun A small circumpolar constellation of the southern sky, said to resemble an octant. It lies closest to the southern celestial pole of any constellation …   Wiktionary

  • Octans — Ọctans   [lateinisch], wissenschaftliche Bezeichnung für das Sternbild Oktant …   Universal-Lexikon

  • Octans — noun the constellation that includes the southern celestial pole • Instance Hypernyms: ↑constellation …   Useful english dictionary

  • Octans (Chinese astronomy) — The modern constellation Octans is not included in the Three Enclosures and Twenty Eight Mansions system of traditional Chinese uranography because its stars are too far south for observers in China to know about them prior to the introduction of …   Wikipedia

  • USS Octans (AF-26) — was an Octans class cargo ship acquired by the U.S. Navy for service in World War II. She was responsible for delivering necessary goods and equipment to ships and stations in the war zone. Octans (AF–26) was built as SS Ulua in 1917 by Workman… …   Wikipedia

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