HD 42818

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Template:Short description

HD 42818
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +4.76[1]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A0 Vn[4]
B−V Template:Engvar Script error: No such module "val".
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: +0.686[2] mas/yr
Dec.: −108.270[2] mas/yr
Parallax (π)18.64±0.23 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.11[1]
Details
HD 42818 A
Mass2.49[7] Template:Solar mass
Radius2.7[8] Template:Solar radius
Luminosity33.83[1] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[7] cgs
TemperatureScript error: No such module "val".[7] K
Metallicity [Fe/H]0.3[9] dex
Rotational velocity (v sin i)255[7] km/s
Age99[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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HD 42818 is a suspected astrometric binary[11] star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye with an apparent visual magnitude of +4.76.[1] Based upon an annual parallax shift of Script error: No such module "val". as seen from Earth's orbit,[6] it is located some 175 light years away. The system appears to be moving closer with a heliocentric radial velocity of Script error: No such module "val"..[5] As of 2012, it is estimated that the system will make its closest approach to the Sun in Script error: No such module "val". at a distance of around Script error: No such module "convert"..[1]

The visible member, designated component A, is an A-type main-sequence star with a stellar classification of A0 Vn,[4] where the 'n' indicates "nebulous" absorption lines due to rotation. It is spinning rapidly with a projected rotational velocity of Script error: No such module "val".[7] (van Belle (2012) lists Script error: No such module "val".), giving the star a pronounced equatorial bulge.[12] Although spectral type A stars are not expected to emit X-rays, the coordinates of this star is a source of X-ray emission with a luminosity of Script error: No such module "val".. This may be coming from a cooler, unseen companion.[13]

The primary has an estimated 2.49 times the mass of the Sun[7] and about 2.7 times the Sun's radius.[8] It is a relatively young star, about 99 million years old. The star is radiating 34 times the Sun's luminosity from its photosphere at an effective temperature of Script error: No such module "val"..[7]

References

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  1. ↑ a b c d e f Template:Cite XHIP
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "Citation/CS1".
  4. ↑ a b 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 c d e f g h Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Template:Cite simbad
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Camelopardalis

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