|Magnitude 4.16||Constellation Gemini|
|People also search for 3 Geminorum, Rho Geminorum|
1 Geminorum (1 Gem) is a star in the constellation Gemini. Its apparent magnitude is 4.15. 1 Geminorum is considered to be on the west side boundary of the constellation of the Gemini figure. This was found in the 19th century by John Flamsteed in a study measuring telescopic positions and they were numbered west to east with their parent.