Gliese 105

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Template:Short description Template:Sky

Gliese 105
File:Gliese 105.gif
Gliese 105 A (left) and C (right).
Observation data
Epoch J2000      Equinox J2000
Constellation Cetus
Gliese 105 A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.83[2]
Gliese 105 B
Right ascension Template:RA[3]
Declination Template:DEC[3]
Apparent magnitude (V) 11.670[4]
Gliese 105 C
Right ascension Template:RA[5]
Declination Template:DEC[5]
Apparent magnitude (V) 16.77[5]
Characteristics
Gliese 105 AC
Spectral type K3 V[2] + M7 V[6]
U−B Template:Engvar +0.800[7]
B−V Template:Engvar +0.972[7]
Gliese 105 B
Spectral type M3.5 V[8]
U−B Template:Engvar +1.10[9]
B−V Template:Engvar +1.61[9]
Variable type BY Dra
Astrometry
Gliese 105 A
Radial velocity (Rv)25.8 ± 0.1[10] 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)138.3400±0.3177 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)6.50[11]
Gliese 105 B
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[3]
Dec.: Script error: No such module "val". mas/yr[3]
Parallax (π)138.4371±0.0420 mas[3]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[8]
Period (P)Script error: No such module "val". yr
Semi-major axis (a)Script error: No such module "val"."
(17.0 ± 0.7 au[12])
Eccentricity (e)Script error: No such module "val".
Inclination (i)Script error: No such module "val".°
Longitude of the node (Ω)Script error: No such module "val".°
Periastron epoch (T)Script error: No such module "val".
Argument of periastron (ω)
(primary)		Script error: No such module "val".°
Semi-amplitude (K1)
(primary)		Script error: No such module "val". km/s
Details[8]
Gliese 105 A
MassScript error: No such module "val". Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
Luminosity (bolometric)Script error: No such module "val". Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val". cgs
TemperatureScript error: No such module "val". K
Metallicity [Fe/H]Script error: No such module "val". dex
AgeScript error: No such module "val". Gyr
Gliese 105 C
MassScript error: No such module "val". Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
Luminosity (bolometric)Script error: No such module "val". Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val". cgs
TemperatureScript error: No such module "val". K
Metallicity [Fe/H]Script error: No such module "val". dex
AgeScript error: No such module "val". Gyr
Gliese 105 B
MassScript error: No such module "val". Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
Luminosity (bolometric)Script error: No such module "val". Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val". cgs
TemperatureScript error: No such module "val". K
Metallicity [Fe/H]Script error: No such module "val". dex
AgeScript error: No such module "val". Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
268 G. Cet,[13] Template:Odlist
Gliese 105 AC: Template:Odlist[14]
Gliese 105 B: Template:Odlist[15]
Database references
SIMBADGl 105
Gl 105 A
Gl 105 B
Gl 105 C
Script error: No such module "Location map".

Script error: No such module "Check for unknown parameters".

Gliese 105 (also known as 268 G. Ceti) is a triple star system in the constellation of Cetus. It is located relatively near the Sun at a distance of 23.6 light-years (7.2 parsecs).[1][3] Despite this, even the brightest component is barely visible with the unaided eye (see Bortle scale). No planets have yet been detected around any of the stars in this system.

This is a triple system with three stars that are all less massive than the Sun. The brightest component is designated HD 16160, and is known as Gliese 105 A. It is a K-type main-sequence star,[2] about 70% the mass of the Sun.[16] This star is unusual because its eruptions appear to not conform to the Waldmeier effect—i.e., the strongest eruptions of HD 16160 are not the ones characterized by the fast eruption onset.[17]

A nearby star has a similar proper motion to Gliese 105 A, so it is assumed to be physically associated with the primary, and is known as Gliese 105 B. The two have an estimated separation of 1,200 astronomical units (au). In 1994, Edward W. Weis announced that component B is a variable star.[18] In 1997 it was given its variable star designation, BX Ceti.[19] It is a BY Draconis variable star whose brightness varies between 11.64 and 11.68 magnitudes.[20]

A third companion, known as Gliese 105 C, lies much closer to A, currently at a distance of approximately 24 au.[6] The pair A-C have an estimated orbital period of about 70 years.[12] While detected directly, Gliese 105 C has also been observed to perturb Gliese 105 A from its usual position;[6] from that, its orbit is estimated to have a high eccentricity of around 0.64 and a semimajor axis of 17 au.[12] Gliese 105 C is an extremely faint red dwarf.[6] It is roughly 8 to 9 percent the mass of the Sun, and it is about 20,000 times fainter than its parent star in visible light—at a distance of 1 au (the distance from the Earth to the Sun) it would only be four times brighter than the full moon.[21]

See also

References

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  1. ↑ a b c d e Template:Cite Gaia EDR3
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  3. ↑ a b c d e f Template:Cite Gaia EDR3
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  5. ↑ a b c Template:Cite simbad
  6. ↑ a b c d Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b c Script error: No such module "Citation/CS1".
  9. ↑ a b Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ a b c Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".
  14. ↑ Template:Cite simbad
  15. ↑ Template:Cite simbad
  16. ↑ Script error: No such module "Citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "Citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Cetus

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