HD 90089

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Template:Short description

HD 90089
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) Script error: No such module "val".[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type F4 V kF2 mF2[5]
U−B Template:Engvar −0.05[6]
B−V Template:Engvar +0.37[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[7] km/s
Proper motion (μ) RA: −86.133[2] mas/yr
Dec.: +19.832[2] mas/yr
Parallax (π)43.4367±0.5983 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)3.60[8]
Details
Mass1.29[9] Template:Solar mass
RadiusScript error: No such module "val".[10] Template:Solar radius
LuminosityScript error: No such module "val".[10] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
TemperatureScript error: No such module "val".[10] K
Metallicity [Fe/H]−0.26[3] dex
Rotational velocity (v sin i)56.2[3] km/s
Age1.074[9] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBADdata

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HD 90089 (HR 4084; Gliese 392.1) is a star located in the northern circumpolar constellation Camelopardalis. With an apparent magnitude of 5.25,[3] it is faintly visible to the naked eye under ideal conditions. This star is located relatively close at a distance of 75 light years,[10] but is drifting away at a rate of almost 8 km/s.[7]

HD 90089 is an F4 main-sequence star with the calcium K-line and metallic lines of an F2 star.[5] Although the spectral type is of a form that would indicate an Am star, it is not listed in any of the major catalogues of chemically peculiar stars.[11] At present it has 1.29 times the mass of the Sun[9] and 1.4 times its radius. It radiates at 3.36 times the luminosity of the Sun from its photosphere at an effective temperature of Script error: No such module "val".,[10] which gives it a yellowish-white hue.

HD 90089's exact age depends on the method, with its X-ray luminosity giving it a young age of only 300 million years.[3] David et al. gave it an age of 1.1 billion years,[9] significantly older than the previous solution; it spins rapidly with a projected rotational velocity of 56.2 km/s,[3] and has an M0 companion separated 13" away[12] and at approximately the same distance.[13]

An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 145 AU. The temperature of this dust is 30 K.[3]

References

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  1. ↑ Template:Cite constellation
  2. ↑ a b c d e Template:Cite Gaia DR3
  3. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  4. ↑ Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b c d e Script error: No such module "Citation/CS1".
  10. ↑ a b c d e Template:Cite Gaia DR2
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Template:Cite Gaia DR3

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External links

Template:Stars of Camelopardalis

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