Tau Geminorum
Template:Location mark Location of τ Geminorum (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Gemini |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.42[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| U−B Template:Engvar | +1.41[2] |
| B−V Template:Engvar | +1.261[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 8.3261±0.1591 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[3] |
| Details | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Radius | Script error: No such module "val".[4] Template:Solar radius |
| Luminosity | Script error: No such module "val".[4] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[3] cgs |
| Temperature | Script error: No such module "val".[4] K |
| Metallicity [Fe/H] | Script error: No such module "val".[3] dex |
| Rotational velocity (v sin i) | 5.8[5] km/s |
| Age | Script error: No such module "val".[3] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | data |
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Tau Geminorum, Latinized from τ Geminorum, is a star in the northern zodiac constellation of Gemini. It has the apparent visual magnitude of +4.42,[2] making it visible to the naked eye under suitably good seeing conditions. This star is close enough to the Earth that its distance can be measured using the parallax technique, which yields a value of roughly Script error: No such module "convert"..[1]
It is an evolved giant star of the spectral type K2 III. It has double[6] the mass of the Sun and has expanded to 30 times the Sun's radius. Tau Geminorum is radiating 364[4] times as much radiation as the Sun from its expanded outer atmosphere at an effective temperature of 4,583 K,[4] giving it the characteristic orange-hued glow of a K-type star. It appears to be rotating slowly with a projected rotational velocity of Script error: No such module "val"..[5]
Substellar companion
This star has a brown dwarf companion designated Tau Geminorum b, whose mass is at least 20.6 Jupiter masses.[3] It was discovered in 2004 by Mitchell and colleagues, who also discovered Nu Ophiuchi b at the same time.[7] This brown dwarf takes Script error: No such module "convert". to revolve around Tau Gem. It may also have a stellar companion; a magnitude 11, K0 dwarf at a projected separation of about Script error: No such module "val"..[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | Script error: No such module "val". | 1.17 | Script error: No such module "val". | Script error: No such module "val". | – | – |
References
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- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b c Script error: No such module "citation/CS1".
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