HD 195019

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Template:Short description

HD 195019
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Delphinus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 6.97 + 10.60[2]
Characteristics
Spectral type G1V[3] + K3:[4]
B−V Template:Engvar 0.662±0.007[5]
Astrometry
Radial velocity (Rv)−91.290±0.0039[6] 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)26.6465±0.0225 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.01[5]
Details
HD 195019 A
Mass1.08±0.01[7] Template:Solar mass
Radius1.47±0.04[7] Template:Solar radius
Luminosity2.23±0.02[7] Template:Solar luminosity
Surface gravity (log g)4.13±0.02[7] cgs
Temperature5,825±56[7] K
Metallicity [Fe/H]0.068±0.030[8] dex
Rotational velocity (v sin i)2.47±0.50[8] km/s
Age7.7±0.7[7] Gyr
HD 195019 B
Mass0.7[9] Template:Solar mass
Surface gravity (log g)4.46[10] cgs
Temperature4,652[10] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)1.71[10] km/s
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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HD 195019 is a binary star system in the northern constellation of Delphinus. The brighter star has a close orbiting exoplanet companion. This system is located at a distance of 122 light years from the Sun based on parallax measurements,[1] but it is drifting closer with a radial velocity of −91.3 km/s.[6] Although it has an absolute magnitude of 4.01,[5] at that distance the system is considered too faint to be viewed with the naked eye, having a combined apparent visual magnitude of 6.87.[5] However, it should be readily visible with a pair of binoculars or a small telescope.[12]

The spectrum of the primary member, designated component A, presents as a G-type main-sequence star with a stellar classification of G1V.[3] An older stellar classification of G3 V/IV[13] suggested it may be near the end of its main sequence lifespan and is evolving into a subgiant star.[12] This is an older star with an estimated age of nearly 8[7] billion years and a low level of magnetic activity in its chromosphere.[7] The abundance of iron is near solar.[8] The star has a mass similar to the Sun but a larger radius. It is radiating 2.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,825 K.[7]

The co-moving companion, component B, was first reported by G. W. Hough in 1881. As of 2016, it is located at an angular separation of Script error: No such module "val". along a position angle of 334° relative to the primary.[2] This corresponds to a projected separation of Script error: No such module "val".. This is a K-type star with 70% of the mass of the Sun[9] and is magnitude 10.60.[2]

Planetary system

In 1998, a planet was discovered at Lick Observatory utilizing a radial velocity method, orbiting around Star HD 195019 A.[13] A search of astrometric observations from Hipparcos suggested this may be a stellar object in a near polar orbit.[14][15][12] However, interferometric observations ruled out a stellar companion in this orbit with high likelihood.[16]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet

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See also

References

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  1. ↑ a b c d e Template:Cite Gaia DR3
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  3. ↑ a b Script error: No such module "Citation/CS1".
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  5. ↑ a b c d Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b c d e f g h i 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. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ a b c Script error: No such module "citation/CS1".
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".

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Template:Sky Template:Stars of Delphinus

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