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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 11 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. The current largest star so far identified in the constellation of Gemini is TV Geminorum.

Gemini Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Gemini is 1446. The number of stars that are of magnitude 6.0 or lower in the constellation is 74. The number of stars in the constellation that make up the outline is 16.

There are 1 deep space objects that were identified by Charles Messier in this constellation. There are 1 non-Messier deep space objects that are covered on this site and the list is below.

Stars of Interest

The nearest star to Earth is Gliese 251 which is roughly about 18.22 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 50554 which is about 97.57 Light Years. The furthest star that can be located in the constellation is HD 52961 which is located about 163081.7 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 Gemini with the naked eye is 44 Geminorum. The dim star has an apparent magnitude of 6. 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.

Constellation Legend

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.

Geminids Meteor Shower

The Geminids are one of the more spectacular meteor showers of the year. They occur at the end of the year, peaking about the 13/14th December. What makes them interesting is that they are multi-coloured rather than all just one colour.

The radiant point for the meteorites is near Castor, the Alpha star in the constellation but not the brightest. The star signifies the right head of the twins. Castor is a multiple star system that when you view closely, you will see it is not just one but a couple of stars.

Whilst meteor showers are associated with comets, this one is associated with an asteroid which was once believed to be a comet but lost all its dust and ice. The asteroid Phaethon orbits closest to the Sun than any other asteroid and has an orbit of roughly 524 days.

Other 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

Gemini Facts

Is a Zodiac Sign Yes
Largest StarTV Geminorum
Brightest StarPollux
Area513.761 sq. deg.
Percentage of Night Sky1.25%
Size Position30th
Hemisphere Equatorial
Site Exoplanet Count11
Meteor Shower Count11
Nearest StarGliese 251
Nearest Star with Exoplanet(s)HD 50554
Dimmest Star44 Geminorum
Furthest StarHD 52961
Bright Star Count74
Hipparcos Star Count1446
Main Star Count16
Messier Deep Space Object Count1
*Non-Messier Deep Space Object Count1
Bordering / Neighbouring / Surrounding ConstellationsAuriga
Canis Minor

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

Gemini Constellation Map

Gemini Constellation Star Map

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

List of Stars with Exoplanets in Gemini

StarDistance (Lt. Yrs.)Exoplanet CountDeclinationRight Ascension
2M 0746+20120d 00` 32.0007h 46m 43.00
HAT-P-20124d 20` 11.0007h 27m 40.00
HAT-P-24114d 15` 44.0007h 15m 18.00
HAT-P-33133d 50` 06.0007h 32m 44.00
HAT-P-39117d 49` 48.0007h 35m 01.99
HAT-P-50128d 08` 22.0007h 52m 15.00
HAT-P-54125d 28` 57.1006h 39m 35.53
HAT-P-56127d 15` 08.0006h 45m 24.00
HD 5055497.571+24d 14` 44.906h 54m 42.85
HD 67087268.452+31d 33` 05.108h 07m 39.77

List of Named Stars in Gemini 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
1 Geminorum155.09+23d 15` 49.106h 04m 07.22
10 Geminorum883.91+23d 36` 11.906h 18m 54.43
11 Geminorum3229.34+23d 28` 09.906h 19m 19.30
12 Geminorum2528.40+23d 16` 28.206h 19m 22.52
141 Tauri785.94+22d 24` 03.806h 01m 41.63
15 Geminorum561.38+20d 47` 22.606h 27m 46.58
16 Geminorum464.62+20d 29` 46.606h 27m 56.69
19 Geminorum440.17+15d 54` 12.706h 31m 37.44
2 Geminorum689.56+23d 38` 19.006h 06m 48.66
20 Geminorum261.77+17d 47` 03.406h 32m 18.52
23 Geminorum256.42+16d 47` 49.506h 36m 02.12
25 Geminorum2064.32+28d 11` 47.906h 41m 20.90
26 Geminorum142.31+17d 38` 43.906h 42m 24.32
28 Geminorum476.15+28d 58` 15.606h 44m 45.46
3 Geminorum14181.01+23d 06` 48.506h 09m 43.99
30 Geminorum288.90+13d 13` 41.306h 43m 59.29
32 Geminorum2861.08+12d 41` 36.806h 45m 54.20
33 Geminorum858.32+16d 12` 10.506h 49m 49.85
35 Geminorum1763.05+13d 24` 47.506h 50m 25.50
36 Geminorum491.21+21d 45` 40.406h 51m 33.05
37 Geminorum56.24+25d 22` 32.306h 55m 18.69
38 Geminorum83.59+13d 10` 40.906h 54m 38.59
39 Geminorum155.46+26d 04` 51.106h 58m 47.52
4 Geminorum851.60+22d 59` 52.406h 10m 29.94
40 Geminorum1194.74+25d 54` 51.106h 59m 27.94
41 Geminorum4348.84+16d 04` 44.407h 00m 15.82
44 Geminorum401.18+22d 38` 14.907h 05m 18.37
45 Geminorum322.61+15d 55` 51.307h 08m 22.04
47 Geminorum388.75+26d 51` 24.007h 11m 23.08
48 Geminorum358.03+24d 07` 43.307h 12m 26.39
49 Geminorum985.39+25d 44` 55.307h 12m 49.38
5 Geminorum568.23+24d 25` 13.406h 11m 32.31
50 Geminorum138.56+27d 13` 30.207h 12m 49.08
51 Geminorum540.90+16d 09` 32.607h 13m 22.27
52 Geminorum300.33+24d 53` 06.707h 14m 41.94
53 Geminorum769.25 +27d 53` 50.707h 15m 57.18
56 Geminorum443.16+20d 26` 37.407h 21m 56.90
57 Geminorum158.95+25d 03` 02.207h 23m 28.55
58 Geminorum285.86+22d 56` 43.607h 23m 28.15
59 Geminorum187.23+27d 38` 16.107h 24m 33.44
6 Geminorum+22d 54` 30.706h 12m 19.10
61 Geminorum446.80+20d 15` 27.307h 26m 56.33
63 Geminorum104.44+21d 26` 44.007h 27m 44.39
64 Geminorum176.21+28d 07` 06.307h 29m 20.46
65 Geminorum483.92+27d 54` 58.307h 29m 48.78
68 Geminorum423.59+15d 49` 36.107h 33m 36.50
70 Geminorum371.91+35d 02` 54.507h 38m 32.84
74 Geminorum525.22+17d 40` 28.307h 39m 28.59
76 Geminorum634.56+25d 47` 03.207h 44m 06.92
79 Geminorum516.90+20d 18` 57.807h 45m 09.34
8 Geminorum446.80+23d 58` 12.206h 16m 19.05
81 Geminorum339.40+18d 30` 36.607h 46m 07.49
82 Geminorum787.83+23d 08` 27.507h 48m 33.65
85 Geminorum374.47+19d 53` 02.607h 55m 39.90
9 Geminorum+23d 44` 27.306h 16m 58.71
AD Geminorum+20 d 56` 20.806h 43m 07.51
Alhena109.30+16d 23` 57.906h 37m 42.70
Alzirr58.70+12d 53` 45.806h 45m 17.43
BM Geminorum2588.60+24d 59` 58.207h 20m 59.01
Castor50.87+31d 53` 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+27d 47` 39.908h 03m 31.10
Geminga+17d 46` 12.906h 33m 54.5
Gliese 25118.22+33d 16` 08.906h 54m 49.47
Iota Geminorum120.36+27d 47` 53.807h 25m 43.68
IS Geminorum416.02+32d 36` 24.806h 49m 41.34
Jishui166.33+34d 35` 04.707h 39m 09.96
Kappa Geminorum141.38+24d 23` 53.307h 44m 26.87
Lambda Geminorum100.89+16d 32` 25.707h 18m 05.61
Mebsuta844.98+25d 07` 52.206h 43m 55.93
Mekbuda1376.22+20d 34` 13.107h 04m 06.54
NP Geminorum805.34+17d 45` 19.607h 02m 25.52
Nu Geminorum544.51+20d 12` 43.806h 28m 57.79
NZ Geminorum1294.30+14d 12` 30.707h 42m 03.22
Omega Geminorum1489.33+24d 12` 55.607h 02m 24.78
OT Geminorum3166.63+15d 31` 01.907h 24m 27.65
OU Geminorum48.04+18d 45` 26.306h 26m 10.32
Phi Geminorum222.49+26d 45` 57.107h 53m 29.84
Pi Geminorum661.59+33d 24` 56.807h 47m 30.34
Pollux33.79+28d 01` 34.707h 45m 19.36
Propus384.63+22d 30` 24.606h 14m 52.70
R Geminorum+22d 42` 12.707h 07m 21.28
Rho Geminorum58.86+31d 47` 02.707h 29m 06.61
RW Geminorum437.80+23d 08` 27.506h 01m 28.06
RX Geminorum1524.13+33d 14` 20.806h 50m 11.55
RY Geminorum1331.28+15d 39` 34.807h 27m 24.17
Sigma Geminorum125.06+28d 53` 02.707h 43m 18.69
Tau Geminorum321.03+30d 14` 43.007h 11m 08.39
Tejat231.65+22d 30` 49.906h 22m 57.59
Theta Geminorum189.08+33d 57` 40.906h 52m 47.34
TV Geminorum3106.32+21d 52` 05.706h 11m 51.41
Upsilon Geminorum270.90+26d 53` 45.607h 35m 55.37
V345 Geminorum527.77+33d 42` 41.307h 38m 30.25
W Geminorum+15d 19` 49.706h 34m 57.45
Wasat60.47+21d 58` 56.407h 20m 07.39
WY Geminorum27180.28+23d 12` 25.406h 11m 56.25

List of Deep Space Objects (Galaxies, Nebulas, Supernovas, etc) in Gemini

NameTypeDistanceDeclinationRight Ascension
Jellyfish NebulaSupernova Remnant500022:31:0506h 17h 13
M35 Open ClusterOpen Cluster2800+24:2006h 08m 9

Gemini Constellation's Star Breakdown

Type Breakdown

KLight Orange Star 3,700 - 5,200k341
FYellow-White 6,000 - 7,500k298
AWhite 7,500 - 10,000k294
GYellow 5,200 - 6,000k268
BBlue-White 10,500 - 30,000k122
MRed Dwarf Star <3,700k54
OBlue Star >33,000k6

Size Breakdown

IIINormal Giant119
VMain Sequence101
IIBright Giant16
IbLess Luminous Supergiant8
IaLuminous Supergiant3
IabIntermediate Luminous Supergiant2

Breakdown of Dwarf Stars by Type

sdsd Type SubDwarf Star3

Breakdown of Carbon Stars by Type

SS-Type Carbon Star4
NN-Type Carbon Star3
CC-Type Carbon Star3
RR-Type Carbon Star2

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