59 Andromedae
Binary star system in the constellation Andromeda
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59 Andromedae, abbreviated 59 And, is a binary star system in the northern constellation of Andromeda with a combined apparent magnitude of 5.64. 59 Andromedae is the Flamsteed designation. As of 2017, the pair had an angular separation of 16.60″ along a position angle (PA) of 36°. Compare this to a separation of 15.3″ along a PA of 35°, as measured in 1783.[12] The two stars have an estimated physical separation of 1,370 AU.[13]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| 59 And A | |
| Right ascension | 02h 10m 52.82448s[2] |
| Declination | +39° 02′ 22.3538″[2] |
| Apparent magnitude (V) | 6.09[1] |
| 59 And B | |
| Right ascension | 02h 10m 53.65660s[3] |
| Declination | +39° 02′ 35.9142″[3] |
| Apparent magnitude (V) | 6.82[1] |
| Characteristics | |
| 59 And A | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B9 V[4] |
| B−V color index | −0.054±0.006[1] |
| 59 And B | |
| Evolutionary stage | main sequence[3][5] |
| Spectral type | A1 Vn[4] |
| B−V color index | +0.081±0.005[1] |
| Astrometry | |
| 59 And A | |
| Radial velocity (Rv) | −1.00±3.4[6] km/s |
| Proper motion (μ) | RA: −13.492[2] mas/yr Dec.: −14.607[2] mas/yr |
| Parallax (π) | 7.4763±0.0499 mas[2] |
| Distance | 436 ± 3 ly (133.8 ± 0.9 pc) |
| 59 And B | |
| Radial velocity (Rv) | 6.0±4.6[6] km/s |
| Proper motion (μ) | RA: −8.983[3] mas/yr Dec.: −17.071[3] mas/yr |
| Parallax (π) | 7.4108±0.0359 mas[3] |
| Distance | 440 ± 2 ly (134.9 ± 0.7 pc) |
| Details | |
| 59 And A | |
| Mass | 2.87[7] M☉ |
| Radius | 2.62[7] R☉ |
| Luminosity | 91[7] L☉ |
| Surface gravity (log g) | 4.06[7] cgs |
| Temperature | 11,002[7] K |
| Rotational velocity (v sin i) | 176[4] km/s |
| Age | 218[8] Myr |
| 59 And B | |
| Mass | 2.34[7] M☉ |
| Radius | 2.23[7] R☉ |
| Luminosity | 32[7] L☉ |
| Surface gravity (log g) | 4.11[7] cgs |
| Temperature | 9,226[7] K |
| Rotational velocity (v sin i) | 233[4] km/s |
| Age | 298[3] Myr |
| Other designations | |
| 59 And, BD+38°425, ADS 1683, WDS J02109+3902[9] | |
| 59 And A: GC 2600, HD 13294, HIP 10176, HR 628, SAO 55330, PPM 67045[10] | |
| 59 And B: GC 2602, HD 13295, HIP 10180, HR 629, SAO 55331, PPM 67046[11] | |
| Database references | |
| SIMBAD | A |
| B | |
The magnitude 6.09[1] primary component is a B-type main-sequence star with a stellar classification of B9 V.[4] It has 2.62 times the Sun's radius and is radiating 91 times the Sun's luminosity from its photosphere at an effective temperature of 11,002 K.[7] It is spinning with a projected rotational velocity of 176 km/s.[4]
The secondary is a magnitude 6.82[1] A-type main-sequence star with a class of A1 Vn,[4] where the 'n' suffix indicates "nebulous" lines due to rapid rotation. It is spinning with a high projected rotational velocity of 233 km/s.[4] The star has 2.34 times the Sun's mass and 2.23 times the Sun's radius. It is radiating 32 times the luminosity of the Sun and has an effective temperature of 9,226 K.[7]