Gamma Ophiuchi
Template:Location mark Location of γ Ophiuchi (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.753[2] |
| Characteristics | |
| Spectral type | A0 V[3] or A1VnkA0mA0[4] |
| U−B Template:Engvar | +0.040[2] |
| B−V Template:Engvar | +0.033[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −24.64[1] mas/yr Dec.: −74.42[1] mas/yr |
| Parallax (π) | 31.73±0.21 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +1.26[5] |
| Details | |
| Mass | 2.9[3] Template:Solar mass |
| Radius | 1.91[6] Template:Solar radius |
| Luminosity | 29[3] Template:Solar luminosity |
| Surface gravity (log g) | 4.03[4] cgs |
| Temperature | Script error: No such module "val".[3] K |
| Rotational velocity (v sin i) | 220[7] km/s |
| Age | Script error: No such module "val".[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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Gamma Ophiuchi, Latinized from γ Ophiuchi, also named Bake-eo,[9] is a fourth-magnitude star in the constellation Ophiuchus. Together with Beta Ophiuchi, it forms the serpent-holder's right shoulder.[10] The star is visible to the naked eye with an apparent visual magnitude of +3.75.[2] Based upon an annual parallax shift of Script error: No such module "val". as seen from Earth, it is located 103 light-years from the Sun. It is moving closer to the Sun with a radial velocity of −7.6 km/s.[5]
Nomenclature
This star is known also as Muliphen,[11][12] although at least two more stars are known with this name: Gamma Canis Majoris (often spelled as Muliphein) and Gamma Centauri (often spelled as Muhlifain).[12] Muliphein is the IAU-approved name of Gamma Canis Majoris.[9]
This star has the Marshallese name Bake-eo (or Bake Eo, pronounced "bakey-yew"), which refers to the spondylus mussel. The IAU Working Group on Star Names approved the name Bake-eo for this star on 20 August 2024 and it is now so entered in the IAU Catalog of Star Names.[9]
Description
Template:CSS image crop This is an A-type main sequence star with a stellar classification of A0 V.[3] Gray et al. (2003) lists a classification of A1VnkA0mA0,[4] indicating it is of type A1 V with the calcium K-line and metallic lines of an A0 star. It is approximately 184[7] million years old and is spinning rapidly with a projected rotational velocity of 220 km/s.[7] Gamma Ophiuchi has nearly three times the mass of the Sun and 1.8 times the Sun's radius.[13] The star shines with 29[3] times the luminosity of the Sun, which is being emitted from its outer atmosphere at an effective temperature of Script error: No such module "val"..[3] It is radiating an excess emission of infrared, suggesting the presence of a circumstellar disk of dust at an orbital radius of 64 AU from the host star.[3] The disk was imaged in 2025.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|
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References
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