HD 16955

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Template:Short description

HD 16955
Observation data
Epoch J2000      Equinox J2000
Constellation Aries[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.376[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A3 V[5]
B−V Template:Engvar Script error: No such module "val".[1]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: Script error: No such module "val".[2] mas/yr
Dec.: Script error: No such module "val".[2] mas/yr
Parallax (π)9.59±0.76 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val".[3]
Details
HD 16955 A
MassScript error: No such module "val".[7] Template:Solar mass
Radius2.4[8] Template:Solar radius
LuminosityScript error: No such module "val".[3] Template:Solar luminosity
Surface gravity (log g)3.97[9] cgs
TemperatureScript error: No such module "val".[3] K
Rotational velocity (v sin i)175[10] km/s
Age1.6[9] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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HD 16955, also known as HR 803, is a double or multiple star. With an apparent visual magnitude of 6.376,[3] is lies at or below the nominal limit for visibility with a typical naked eye. The measured annual parallax shift is 9.59 milliarcseconds, which yields an estimated distance of around 340 light years. The star is moving closer to the Sun with a heliocentric radial velocity of around -10 km/s.[6]

This is an A-type main-sequence star with a stellar classification of A3 V.[5] Hauck et al. (1995) identified this as a Lambda Boötis star with a circumstellar shell,[12] but this now appears to be unlikely.[3] It has 2.25[7] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 175 km/s.[10] The star is radiating about 27[3] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,450 K.[3]

HD 16955 has a magnitude 10.36 companion, component B, which is located, as of 2015, at an angular separation of 3.0 arcseconds along a position angle of 19°.[13] This is the likely source for the detected X-ray emission with a luminosity of Script error: No such module "val". coming from these coordinates, since A-type stars are not expected to emit X-rays.[14] Component C is a more distant magnitude 12.94 companion located at a separation of 51.10 arcseconds along a position angle of 92°, as of 2015.[13]

References

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

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Template:Stars of Aries

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