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Gemini Constellation

Gemini (Pronounciation:Gem-in-eye, Abbrev:Gem, Latin:Geminorum) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Gemini takes up 513.761 sq. degrees of the night sky which equates to 1.25% of the night sky. The constellation gets its name as it name means The Twins . The constellation is one of the original constellations that was devised by the Ancient Greco-Egyptian astronomer Ptolemy who lived between 90 A.D. and 168 A.D.

Gemini is a member constellation of the Zodiac grouping, a group of 12 star signs that astrologers use to predict someones future based on their date of birth and which constellation appeared when the Sun set. The Zodiac year may be divided up equally between the twelve signs but when they appear in the night sky no longer conforms to the Zodiac calendar. Gemini is an equatorial constellation that can be seen by countries nearest the Equator. The brightest star in Gemini is Pollux. There are 6 Extrasolar Planets (Exoplanets) detailed on this site.

Legend of the Constellation

Zeus seduced Leda, the wife of Tyndareus whilst as a swan. Helen and Pollux were born from eggs. At the same time, Castor and Clytaemnestra were born, children of Tyndareus. Pollux was the son of a god and an immortal, he could not die. They grew up as brothers, competing against one another in competitions and Olympics. During competition between them and their cousins, Idas and Lynceus, Castor died. Pollux asked Zeus to allow him to die so that he could be with his brother which Zeus allowed.

Meteor Showers

There are 11 Meteor Showers that occur during the year within this constellation based on information gathered from Adam Mickiewicz University (Poland). The ones listed as the ones I've been able to find a date range for. For others if you have the time, you can visit the AMU site, obtains the SL value then use IMO tables to calculate the date. A lot of the Meteor Showers are weak and you need to do a lot of stargazing to spot them.

NameActivityPeak ActivityClosest Star
Rho Geminids28-Dec - 28 Jan8/9 JanRho Geminorum
Epsilon GeminidsOct 14 - Oct 27 Oct 18Mebsuta
GeminidsDecember 6-19Dec. 13/14Castor

Gemini Facts

Is a Zodiac Sign Yes
Brightest StarPollux
Area513.761 sq. deg.
Percentage of Night Sky1.25%
Size Position30th
Hemisphere Equatorial
Site Exoplanet Count6
Meteor Shower Count11
Bordering / Neighbouring / Surrounding ConstellationsAuriga
Canis Minor

Gemini Constellation Map

Gemini Constellation Star Map

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

List of Named Stars in Gemini

StarDistanceDeclinationRight Ascension
AD Geminorum+20 d 56`20.806h 43m 07.51
Alhena109.30+16d23`57.906h 37m 42.70
Alzirr58.70+12d53`45.806h 45m 17.43
BM Geminorum2588.60+24d59`58.207h 20m 59.01
Castor50.87+31d53`19.107h 34m 36.00
Castor B+31 d 53 ` 18.5707h 34m 36.10
Castor C+31 d 53 ' 17.8107h 34m 37.584
Chi Geminorum256.22+27d47`39.908h 03m 31.10
Gliese 25118.22+33d16`08.906h 54m 49.47
Iota Geminorum120.36+27d47`53.807h 25m 43.68
IS Geminorum416.02+32d36`24.806h 49m 41.34
Kappa Geminorum141.38+24d23`53.307h 44m 26.87
Lambda Geminorum100.89+16d32`25.707h 18m 05.61
Mebsuta844.98+25d07`52.206h 43m 55.93
Mekbuda1376.22+20d34`13.107h 04m 06.54
NP Geminorum805.34+17d45`19.607h 02m 25.52
Nu Geminorum544.51+20d12`43.806h 28m 57.79
NZ Geminorum1294.30+14d12`30.707h 42m 03.22
Omega Geminorum1489.33+24d12`55.607h 02m 24.78
Omicron Geminorum166.33+34d35`04.707h 39m 09.96
OT Geminorum3166.63 +15d31`01.907h 24m 27.65
OU Geminorum48.04+18d45`26.306h 26m 10.32
Phi Geminorum222.49+26d45`57.107h 53m 29.84
Pi Geminorum661.59+33d24`56.807h 47m 30.34
Pollux33.79+28d01`34.707h 45m 19.36
R Geminorum+22d42`12.707h 07m 21.28
Rho Geminorum58.86+31d47`02.707h 29m 06.61
RW Geminorum437.80+23d08`27.506h 01m 28.06
RX Geminorum1524.13+33d14`20.806h 50m 11.55
RY Geminorum1331.28+15d39`34.807h 27m 24.17
Sigma Geminorum125.06+28d53`02.707h 43m 18.69
Tau Geminorum321.03+30d14`43.007h 11m 08.39
Tejat Posterior231.65+22d30`49.906h 22m 57.59
Tejat Prior384.63+22d30`24.606h 14m 52.70
Theta Geminorum189.08+33d57`40.906h 52m 47.34
TV Geminorum3106.32+21d52`05.706h 11m 51.41
Upsilon Geminorum270.90+26d53`45.607h 35m 55.37
V345 Geminorum527.77+33d42`41.307h 38m 30.25
W Geminorum+15d19`49.706h 34m 57.45
Wasat60.47+21d58`56.407h 20m 07.39
WY Geminorum27180.28+23d12`25.406h 11m 56.25

Objects of Interest (Galaxies, Nebulas, Supernovas, etc) in Gemini

NameTypeDistanceDeclinationRight Ascension
M35 Open ClusterOpen Cluster2.8+24:2006h 08m 9

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