HD 225218

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Template:Short description

HD 225218
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda[1]
HD 225218 A
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.16[3]
HD 225218 B
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 9.65[3]
Characteristics
Spectral type B9III[5] + F0V:
U−B Template:Engvar 0.14
B−V Template:Engvar 0.15
Astrometry
HD 225218 A
Radial velocity (Rv)−8.0[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)3.0041±0.3539 mas[2]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
HD 225218 B
Proper motion (μ) RA: Script error: No such module "val".[4] mas/yr
Dec.: Script error: No such module "val".[4] mas/yr
Parallax (π)4.4324±0.0208 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[7]
Period (P)70.12 yr
Semi-major axis (a)0.165″
Eccentricity (e)0.515
Details
Luminosity394[8] Template:Solar luminosity
Temperature7,611[8] K
Rotation25[9]
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
BD+41 4933, HD 225218, HIP 365, HR 9105, NSV 15012, SAO 36037, WDS J00046+4206
Database references
SIMBADA
B

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HD 225218 is a quadruple star system in the northern constellation of Andromeda. The primary component, HD 225218 A, is a giant star with a stellar classification of B9III,[5] an apparent magnitude of 6.16,[3] and is a candidate Lambda Boötis star.[10] It has a fainter, magnitude 9.65 companion, HD 225218 B, at an angular separation of 5.2″ along a position angle of 171°.[3] The primary itself has been identified as a binary star system through interferometry, with the two components separated by 0.165″. The pair, HD 225218 Aa and Ab, orbit each other with a period of about 70 years and an eccentricity of 0.515.[7] Component B is likewise a spectroscopic binary.[10]

References

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  1. ↑ Template:Cite constellation
  2. ↑ a b c d e Template:Cite Gaia EDR3
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ a b c d e Template:Cite Gaia EDR3
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ a b 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. ↑ a b Script error: No such module "citation/CS1".

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External links

Template:Stars of Andromeda

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