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Circinus Constellation

Circinus (Pronounciation:Sir-sin-us, Abbrev:Cir, Latin:Circini) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Circinus takes up 93.353 sq. degrees of the night sky which equates to 0.23% of the night sky. The constellation gets its name as it name means The Compasses . 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.

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

The brightest star in Circinus is Alpha Circini. There are 3 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site.

Circinus Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Circinus is 457. The number of stars that are of magnitude 6.0 or lower in the constellation is 21. The number of stars in the constellation that make up the outline is 3.

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 Alpha Circini which is roughly about 54.05 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 134060 which is about 78.94 Light Years. The furthest star that can be located in the constellation is HIP 72967 which is located about 326163 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 Circinus with the naked eye is HD 121932. The dim star has an apparent magnitude of 5.96. 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.

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

Circinus Facts

Is a Zodiac Sign No
Brightest StarAlpha Circini
Area93.353 sq. deg.
Percentage of Night Sky0.23%
Size Position85th
Hemisphere Southern
Site Exoplanet Count3
Meteor Shower Count1
Nearest StarAlpha Circini
Nearest Star with Exoplanet(s)HD 134060
Dimmest StarHD 121932
Furthest StarHIP 72967
Bright Star Count21
Hipparcos Star Count457
Main Star Count3
Messier Deep Space Object Count0
*Non-Messier Deep Space Object Count0
Bordering / Neighbouring / Surrounding ConstellationsLupus
Triangulum Australe

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

Circinus Constellation Map

Circinus Constellation Star Map

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

List of Stars with Exoplanets in Circinus

StarDistance (Lt. Yrs.)Exoplanet CountDeclinationRight Ascension
HD 129445213.741-68d 45` 45.414h 46m 03.38
HD 13406078.942-61d 25` 20.315h 10m 44.97

List of Named Stars in Circinus 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.)Declination Right Ascension
Alpha Circini54.05-64d 58` 28.514h 42m 30.69
AX Circini1647.29-63d 48` 35.314h 52m 35.27
Beta Circini99.65-58d 48` 03.215h 17m 30.96
BP Circini-61d 27` 43.014h 46m 41.99
BU Circini1148.46-55d 36` 05.814h 45m 10.97
CO Circini1405.88-66d 35` 36.714h 48m 44.56
Delta Circini3664.76-60d 57` 26.115h 16m 56.90
Epsilon Circini407.70-63d 36` 37.815h 17m 38.89
Eta Circini275.94-64d 01` 52.915h 04m 48.05
Gamma Circini448.64-59d 19` 14.515h 23m 22.66
Theta Circini1510.02-62d 46` 51.614h 56m 44.00
WR 66644.59-59d 50` 30.215h 14m 57.72
WR 70551.88+62d 56` 58.016h 18m 07.00
Zeta Circini1274.08-65d 59` 27.814h 54m 42.59

Circinus Constellation's Star Breakdown

Type Breakdown

BBlue-White 10,500 - 30,000k127
KLight Orange Star 3,700 - 5,200k92
FYellow-White 6,000 - 7,500k79
AWhite 7,500 - 10,000k65
GYellow 5,200 - 6,000k59
MRed Dwarf Star <3,700k11
OBlue Star >33,000k3

Size Breakdown

IIINormal Giant151
VMain Sequence140
IIBright Giant32
IbLess Luminous Supergiant13
WWolf-Rayet Star3
IaLuminous Supergiant2
IabIntermediate Luminous Supergiant1

Breakdown of Carbon Stars by Type

CC-Type Carbon Star1

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