HD 225218

HD 225218
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
HD 225218 A
Right ascension 00h 04m 36.58441s[1]
Declination +42° 05′ 33.0865″[1]
Apparent magnitude (V) 6.16[2]
HD 225218 B
Right ascension 00h 04m 36.67195s[3]
Declination +42° 05′ 27.8497″[3]
Apparent magnitude (V) 9.65[2]
Characteristics
Spectral type B9III[4] + F0V:
U−B color index 0.14
B−V color index 0.15
Astrometry
HD 225218 A
Radial velocity (Rv)−8.0[5] km/s
Proper motion (μ) RA: −10.367±0.266[1] mas/yr
Dec.: −14.491±0.222[1] mas/yr
Parallax (π)3.0041 ± 0.3539 mas[1]
Distanceapprox. 1,100 ly
(approx. 330 pc)
HD 225218 B
Proper motion (μ) RA: −12.314±0.015[3] mas/yr
Dec.: −16.129±0.015[3] mas/yr
Parallax (π)4.4324 ± 0.0208 mas[3]
Distance736 ± 3 ly
(226 ± 1 pc)
Orbit[6]
Period (P)70.12 yr
Semi-major axis (a)0.165″
Eccentricity (e)0.515
Details
Luminosity394[7] L☉
Temperature7,611[7] K
Rotation25[8]
Other designations
BD+41 4933, HD 225218, HIP 365, HR 9105, NSV 15012, SAO 36037, WDS J00046+4206.
Database references
SIMBADdata
Database references
SIMBADdata

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,[4] an apparent magnitude of 6.16,[2] and is a candidate Lambda Boötis star.[9] It has a fainter, magnitude 9.65 companion, HD 225218 B, at an angular separation of 5.2″ along a position angle of 171°.[2] 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.[6] Component B is likewise a spectroscopic binary.[9]

  1. ^ a b c d e Cite error: The named reference Gaia EDR3 for A was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference WDSC2001 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Gaia EDR3 for B was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcrv1953 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference aa546_A69_5 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Mcdonald_et_al_2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference apj573_1_359 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference aa349_521 was invoked but never defined (see the help page).