Tau Geminorum
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
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 | |
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 if 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].
[edit] References
- NSV 3437 -- Variable Star. SIMBAD.
- ^ Mitchell et al. (2004). "Four Substellar Companions Found Around K Giant Stars". AAS.
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