HD 225218
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 04m 36.58707s[1] |
| Declination | +42° 05′ 33.1118″[1] |
| Apparent magnitude (V) | 6.133 (6.16 + 9.65)[2] |
| Characteristics | |
| Spectral type | B9III[3] + F0V: |
| U−B color index | 0.14 |
| B−V color index | 0.15 |
| Astrometry | |
| Radial velocity (Rv) | −8.0[4] km/s |
| Proper motion (μ) | RA: −11.35±0.42[1] mas/yr Dec.: −12.64±0.36[1] mas/yr |
| Parallax (π) | 2.59 ± 0.56[1] mas |
| Distance | approx. 1,300 ly (approx. 390 pc) |
| Orbit[5] | |
| Period (P) | 70.12 yr |
| Semi-major axis (a) | 0.165" |
| Eccentricity (e) | 0.515 |
| Details | |
| Luminosity | 394[6] L☉ |
| Temperature | 7,611[6] K |
| Rotation | 25[7] |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
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,[3] an apparent magnitude of 6.16,[2] and is a candidate Lambda Boötis star.[8] 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.[5] Component B is likewise a spectroscopic binary.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.Vizier catalog entry
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
External links
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