July 16

Leap Leap+1 Leap+2 Leap+3
1950 75Sigma GEM 75Sigma GEM 75Sigma GEM
77Kappa GEM 77Kappa GEM 77Kappa GEM 77Kappa GEM
78Beta GEM 78Beta GEM 78Beta GEM
2000 75Sigma GEM 75Sigma GEM 75Sigma GEM 75Sigma GEM
77Kappa GEM 77Kappa GEM 77Kappa GEM
78Beta GEM 78Beta GEM

In a few cases you have a choice and you can consult the descriptions to see which one you like better.
Remember that a smaller magnitude number is a brighter star, if that is your preference.

78 Beta is Pollux, a bright and well-known star and a great choice. Even for L+2 and L+3 in the 2000 era, where it is not the technical choice, it will be pretty close.

75Sigma GEM
Birthday from Jack’s initial research: July 16
Magnitude: 4.3, variable
Spectrum/Star type: Orange Giant
Distance in Light Years: 120
Diameter compared to Sun: 15
Luminosity compared to Sun: 80
Date best observed: Mar 2
Additional information: Spectroscopic Binary. Sigma is just above Pollux.

77Kappa GEM
Birthday from Jack’s initial research: July 16
Magnitude: 3.6
Spectrum/Star type: Yellow Giant
Distance in Light Years: 145
Diameter compared to Sun: 11
Luminosity compared to Sun: 60
Date best observed: Mar 2
Additional information: Probably a Binary

Name: 78Beta GEM Pollux
Birthday from Jack’s initial research: July 16
Magnitude: 1.1, 17th brightest
Spectrum/Star type: Orange Giant
Distance in Light Years: 34, close to us
Diameter compared to Sun: 10
Luminosity compared to Sun: 45
Date best observed: Mar 3
Additional information: Brightest star with a planet. A Boxer, the immortal one of the
Twins. Pollux is a Navigational Star and is the
left one of The Twins-it has 2 “l”s in its name! Notice here, the brighter star is the “Beta” one.

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