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Octans Constellation

Octans (Pronounciation:Oct-ans, Abbrev:Oct, Latin:Octantis) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Octans takes up 291.045 sq. degrees of the night sky which equates to 0.71% of the night sky. The constellation gets its name as it name means The Octant . It was not one of the original constellations that had been devised by Ptolemy, instead it was created by Abbé Nicolas Louis de Lacaille years later.

Octans is not a member of the Zodiac group of twelve constellations that appear when the Sun sets. Octans is a southern hemispheric constellation which means it can't be seen easily or at all from the northern hemisphere.

The brightest star in Octans is Nu Octantis. There are 2 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site.

Octans Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Octans is 794. The number of stars that are of magnitude 6.0 or lower in the constellation is 35. The number of stars in the constellation that make up the outline is 5.

There are no deep space objects that were identified by Charles Messier in this constellation. There are no non-Messier deep space objects in this constellation that are covered at present on this site.

Stars of Interest

The nearest star to Earth is HIP 113229 which is roughly about 28.1 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 142022 which is about 111.97 Light Years. The furthest star that can be located in the constellation is HIP 86836 which is located about 326163.3 Light Years away from the Sun. The furthest figure is derived from either the 1997 or 2007 Hipparcos star catalogue parallax figure and it has been known to produce distances that are wrong.

The dimmest star that can be seen in Octans with the naked eye is Mu1 Octantis. The dim star has an apparent magnitude of 5.99. The dimmest star that a person is able to see with their naked eye is 6.0 magnitude based on the table in the reference. Ref: University of Michigan

The caveat of these stars are that they are catalogued on this site. If you know of a star that is nearer or further then do let me know in the comments and I'll add it to the site. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status.

There is no Greek Legend behind this constellation. It was created by Abbé Nicolas Louis de Lacaille to fill in the voids in the astronomical charts.

Items of Interest

Octans is the southern most constellation and covers the south pole area when you look directly up. Unlike Polaris which is directly overhead in the North Pole, there is not an equivalent. The star closest to the South Pole in terms of overhead has the name Polaris Australis.

There are no major meteor showers that radiate from within this constellation.

Octans Facts

Is a Zodiac Sign No
Brightest StarNu Octantis
Area291.045 sq. deg.
Percentage of Night Sky0.71%
Size Position50th
Hemisphere Southern
Site Exoplanet Count2
Meteor Shower Count1
Nearest StarHIP 113229
Nearest Star with Exoplanet(s)HD 142022
Dimmest StarMu1 Octantis
Furthest StarHIP 86836
Bright Star Count35
Hipparcos Star Count794
Main Star Count5
Messier Deep Space Object Count0
*Non-Messier Deep Space Object Count0
Bordering / Neighbouring / Surrounding ConstellationsIndus

*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.

Octans Constellation Map

Octans Constellation Star Map

The map was generated using Night Vision, an awesome free application by Brian Simpson.

List of Stars with Exoplanets in Octans

StarDistance (Lt. Yrs.)Exoplanet CountDeclinationRight Ascension
HD 142022111.971-84d 13` 53.516h 10m 16.98
HD 212301179.211-77d 43` 03.722h 27m 30.71

List of Named Stars in Octans without Extrasolar Planets

As there's so many stars in the cosmos, not all the stars are listed here. The site has lots of stars not listed so if your star isn't listed and you know the Henry Draper or Hipparcos ID, type https://www.universeguide.com/star/ then followed by the HIPNNNNNN or HDNNNN where NNNNN is the number part of the name. The stars that I do list have either a traditional name, a bayer or other classification name.

StarDistance (Lt. Yrs.)DeclinationRight Ascension
Alpha Octantis142.00-77d 01` 22.321h 04m 43.03
B Octantis335.21-88d 49` 05.522h 45m 29.59
Beta Octantis149.27-81d 22` 53.822h 46m 03.72
BP Octantis212.21-88d 07` 58.115h 28m 20.68
BQ Oct1591.04-89d 46` 18.114h 35m 30.80
CF Octantis683.78-80d 08` 01.120h 49m 37.26
Chi Octantis256.82-87d 36` 19.918h 54m 47.65
CW Octantis627.24-86d 21` 51.517h 00m 58.44
Delta Octantis298.96-83d 40` 04.314h 26m 55.74
Epsilon Octantis290.70-80d 26` 22.722h 20m 01.48
Eta Octantis344.05-84d 35` 37.910h 59m 14.16
Gamma1 Octantis265.17-82d 01` 07.623h 52m 06.69
Gamma2 Octantis305.11-82d 10` 11.123h 57m 32.99
Gamma3 Octantis254.62-82d 13` 26.400h 10m 02.27
Iota Octantis351.85-85d 07` 24.312h 54m 58.35
Kappa Octantis273.17-85d 47` 09.613h 40m 56.18
Lambda Octantis409.24-82d 43` 07.821h 50m 54.25
Mu1 Octantis329.79-76d 10` 50.020h 42m 02.52
Mu2 Octantis144.38-75d 21` 01.520h 41m 43.74
Nu Octantis69.15-77d 23` 22.121h 41m 28.47
Omega Octantis316.97-84d 47` 16.215h 11m 08.79
Omicron Octantis1792.11-88d 21` 46.400h 12m 33.67
Phi Octantis194.03-75d 02` 39.618h 23m 36.44
Pi1 Octantis393.92-83d 13` 40.015h 01m 50.70
Pi2 Octantis1953.07-83d 02` 17.815h 04m 46.96
Polaris Australis280.93-88d 57` 23.421h 08m 46.01
Psi Octantis125.54-77d 30` 41.722h 17m 50.70
R Octantis1964.84-86d 23` 18.005h 26m 06.18
Rho Octantis215.72-84d 27` 55.815h 43m 16.10
Tau Octantis486.09-87d 28` 56.123h 28m 03.57
Theta Octantis217.15-77d 03` 55.100h 01m 35.85
Upsilon Octantis324.22-85d 58` 02.622h 31m 37.83
UV Octantis1336.74-83d 54` 09.416h 32m 25.85
X Oct997.44-84d 20` 54.110h 26m 14.33
Xi Octantis492.69-80d 07` 25.722h 50m 22.75
Zeta Octantis162.27-85d 39` 47.608h 56m 41.88

Octans Constellation's Star Breakdown

Type Breakdown

FYellow-White 6,000 - 7,500k216
KLight Orange Star 3,700 - 5,200k207
GYellow 5,200 - 6,000k175
AWhite 7,500 - 10,000k96
MRed Dwarf Star <3,700k42
BBlue-White 10,500 - 30,000k33

Size Breakdown

IIINormal Giant291
VMain Sequence283
IIBright Giant8
IbLess Luminous Supergiant3
IabIntermediate Luminous Supergiant1

Breakdown of Carbon Stars by Type

RR-Type Carbon Star2

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tonberry kingWednesday, 4th October 2017 12:35:57 AM