LN Andromedae
LN Andromedae (LN And), also known as HD 217811, HR 8768, is a formerly suspected variable star in the constellation Andromeda. Located approximately 458 parsecs (1,490 ly) away from Earth, it shines with an apparent visual magnitude 6.41, thus it can be seen by the naked eye under very favourable conditions. Its spectral classification is B2V, meaning that it's a hot main sequence star, emitting light approximately with a blackbody spectrum at an effective temperature of 18,090 K.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Andromeda |
| LN Andromedae A | |
| Right ascension | 23h 02m 45.14786s |
| Declination | +44° 03′ 31.4984″ |
| Apparent magnitude (V) | 6.37 |
| LN Andromedae B | |
| Right ascension | 23h 02m 45.60328s |
| Declination | +44° 03′ 37.2673″ |
| Apparent magnitude (V) | 9.88 |
| Characteristics | |
| A | |
| Spectral type | B2V |
| Apparent magnitude (U) | 5.8 |
| Apparent magnitude (B) | 6.377 |
| Apparent magnitude (J) | 6.368 |
| Apparent magnitude (H) | 6.482 |
| Apparent magnitude (K) | 6.496 |
| Variable type | SPB? |
| B | |
| Spectral type | A1V |
| Astrometry | |
| LN Andromedae A | |
| Radial velocity (Rv) | −11.30±0.1 km/s |
| Proper motion (μ) | RA: 0.441±0.019 mas/yr Dec.: −5.799±0.027 mas/yr |
| Parallax (π) | 2.1847 ± 0.0280 mas |
| Distance | 1,490 ± 20 ly (458 ± 6 pc) |
| Absolute magnitude (MV) | −1.66 |
| LN Andromedae B | |
| Proper motion (μ) | RA: 0.238±0.012 mas/yr Dec.: −5.813±0.016 mas/yr |
| Parallax (π) | 2.2005 ± 0.0182 mas |
| Distance | 1,480 ± 10 ly (454 ± 4 pc) |
| Details | |
| A | |
| Mass | 6.5 M☉ |
| Radius | 3.1 R☉ |
| Luminosity | 608 L☉ |
| Surface gravity (log g) | 3.94±0.13 cgs |
| Temperature | 18090±730 K |
| Metallicity [Fe/H] | −0.23 dex |
| Rotational velocity (v sin i) | 8±4 km/s |
| Age | 9.5±4.8 Myr |
| B | |
| Mass | 2.1 M☉ |
| Radius | 2.0 R☉ |
| Luminosity | 13 L☉ |
| Surface gravity (log g) | 4.1 cgs |
| Temperature | 9,843 K |
| Metallicity [Fe/H] | −0.33 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
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