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Tau Geminorum
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Gemini
Right ascension 07h 11m 08.3707s
Declination +30º 14' 42.5873″
Apparent magnitude (V) +4.398
Absolute magnitude (V) −0.433
Distance 301.7 ly
(92.5 pc)
Spectral type K2III
Other designations
46 Gem, BD+30 1439, HD 54719, HIP 34693, HR 2697, SAO 59858
Giant star Tau Geminorum and its brown dwarf companion.

Tau Geminorum is a star in Gemini constellation. It has the spectral type K2III or orange giant, meaning the star is probably fusing carbon and oxygen in its core to form iron and nickel. It has the apparent magnitude of 4.40, which can be visible to the naked eye with moderate difficulty. The absolute magnitude is −0.43, which is extremely easy to see as this star is located 10 pc from Earth. The stellar distance from our Solar System is 301.7 ly or 92.5 pc or 2.854 Em.

This star has a brown dwarf companion Tau Geminorum b with mass of 18.1 Jupiter mass discovered in 2004 by Mitchell et al., who also discovered Nu Ophiuchi b at the same time. This brown dwarf takes 305 days or 0.84 years or 26.4 megaseconds to revolve around Tau Gem[1].

The Tau Geminorum system[1]
(in order from star)
Mass Semimajor axis
Orbital period
b ≥18.1 MJ ≥0.88 305  ?




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