HD 136118
File:Star HD136118.jpg Telescope image of HD 136118 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Serpens[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 6.93[1] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | F7V[4] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[2] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 19.8116±0.0341 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 3.60[5] |
| Details | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | Script error: No such module "val".[7] Template:Solar luminosity |
| Surface gravity (log g) | 4.08[5] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | Script error: No such module "val".[1] dex |
| Rotational velocity (v sin i) | 8.5[5] km/s |
| Age | Script error: No such module "val".[1] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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HD 136118 is a star in the Serpens Caput section of the Serpens constellation. The star is too dim to be readily visible to the naked eye, having an apparent visual magnitude of 6.93.[1] It is located at a distance of 165 light years from the Sun based on parallax,[2] and is drifting closer with a radial velocity of −3 km/s.[1]
This object is an F-type main-sequence star with a stellar classification of F7V.[4] The absolute visual magnitude of this star suggests that it has begun to evolve away from the main sequence.[3] The abundances of the stellar atmosphere are similar to the Sun, and it has only a modest level of chromospheric activity.[9] HD 136118 has 84% more mass compared to the Sun,[6] and is 70%[7] larger in radius. The star is an estimated 3.5[1] billion years old and is spinning with a projected rotational velocity of 8.5 km/s.[5]
Brown dwarf companion
The astronomer Debra Fischer discovered a substellar companion, originally thought to be a very massive exoplanet, which was announced on February 7, 2002.[3] Designated HD 136118 b, it is orbiting the host star with a period of Script error: No such module "convert"..[9] This object has a minimum mass of Template:Jupiter mass.[3] On November 25, 2009, its inclination was calculated to be 163.1° and its true mass Template:Jupiter mass, classifying it as a brown dwarf.[9] Later studies in 2022 and 2023 found true masses of about Template:Jupiter mass, closer to the minimum mass, but still classifying the companion as a brown dwarf by most definitions.[10][11]
Due to its high mass the object is likely to be very hot and possibly glowing faintly. The orbit of the object has a semimajor axis of 1.45 astronomical units from the parent star, taking Script error: No such module "convert". to complete one eccentric orbit.
Template:OrbitboxPlanet begin Template:OrbitboxPlanet
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See also
References
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- ↑ a b c d Template:Cite Gaia DR2
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External links
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