R Geminorum
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Gemini |
| Right ascension | 07h 07m 21.27095s[1] |
| Declination | +22° 42′ 12.7077″[1] |
| Spectral type | S3.5-6.5/6e |
R Geminorium (R Gem) is a Mira variable and technetium star in the constellation Gemini. When at maximum light its apparent visual magnitude usually is between 6 and 7, while at minimum light it is typically near magnitude 14.[2] It is located approximately 575 parsecs (1,880 ly) away.[1]
It is one of the brightest known examples of an S-type star, a type that is similar to M-type star, but whose spectra shows zirconium oxide, yttrium oxide and technetium.[3] These exotic elements are formed in the star's core. Technetium has a half-life of just 4.2 million years, so it must have been brought up from the core relatively recently. R Gem has an unusual amount of it, even for an S-type star.[3]
References
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