88 Tauri
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| 88 Tau A | |
| Right ascension | 04h 35m 39.25910s |
| Declination | +10° 09′ 38.8396″ |
| Apparent magnitude (V) | 4.250 |
| 88 Tau B | |
| Right ascension | 04h 35m 35.1775s |
| Declination | +10° 10′ 13.572″ |
| Apparent magnitude (V) | 7.84 |
| Characteristics | |
| 88 Tau A | |
| Spectral type | A6m / F5 / G2-3: / G2-3: |
| U−B color index | +0.08 |
| B−V color index | +0.19 |
| 88 Tau B | |
| Spectral type | F8V / M? |
| U−B color index | +0.04 |
| B−V color index | +0.54 |
| Astrometry | |
| 88 Tau A | |
| Radial velocity (Rv) | 23.97 km/s |
| Proper motion (μ) | RA: +43.13 mas/yr Dec.: −52.71 mas/yr |
| Parallax (π) | 20.88±0.94 mas |
| Distance | 156 ± 7 ly (48 ± 2 pc) |
| 88 Tau B | |
| Radial velocity (Rv) | 23.97 km/s |
| Proper motion (μ) | RA: +51.8 mas/yr Dec.: −49.4 mas/yr |
| Orbit | |
| Primary | 88 Tau Aa |
| Companion | 88 Tau Ab |
| Period (P) | 6,585±12 d |
| Semi-major axis (a) | 240.1±5.3 mas 12.17±0.17 AU |
| Eccentricity (e) | 0.0715±0.0026 |
| Inclination (i) | 69.923±0.048° |
| Longitude of the node (Ω) | 146.734±0.067° |
| Periastron epoch (T) | 2,455,261±22 |
| Argument of periastron (ω) (secondary) | 205.7±1.2° |
| Orbit | |
| Primary | 88 Tau Aa1 |
| Companion | 88 Tau Aa2 |
| Period (P) | 3.571096±0.000003 d |
| Semi-major axis (a) | 1.359±0.034 mas 0.0689±0.0012 AU |
| Eccentricity (e) | 0 |
| Inclination (i) | 110.6±2.7° |
| Longitude of the node (Ω) | 287.5±1.8° |
| Argument of periastron (ω) (secondary) | 0° |
| Orbit | |
| Primary | 88 Tau Ab1 |
| Companion | 88 Tau Ab2 |
| Period (P) | 7.886969 ± 0.000066 d |
| Semi-major axis (a) | 1.967±0.054 mas 0.0997±0.0021 AU |
| Eccentricity (e) | 0 |
| Inclination (i) | 27.23±0.72° |
| Longitude of the node (Ω) | 34.0±8.2° |
| Periastron epoch (T) | 2,452,507.31±0.02 |
| Argument of periastron (ω) (secondary) | 0° |
| Orbit | |
| Primary | 88 Tau Ba |
| Companion | 88 Tau Bb |
| Period (P) | 1,350±35 d |
| Semi-major axis (a) | 0.057″ |
| Eccentricity (e) | 0.663±0.075 |
| Periastron epoch (T) | 2,450,498±34 |
| Argument of periastron (ω) (secondary) | 223±9° |
| Semi-amplitude (K1) (primary) | 3.24±0.44 km/s |
| Details | |
| 88 Tau Aa1 | |
| Mass | 2.06±0.11 M☉ |
| Rotational velocity (v sin i) | 37±2 km/s |
| 88 Tau Aa2 | |
| Mass | 1.361±0.073 M☉ |
| Rotational velocity (v sin i) | 17±2 km/s |
| 88 Tau Ab1 | |
| Mass | 1.069±0.069 M☉ |
| Rotational velocity (v sin i) | 5±3 km/s |
| 88 Tau Ab2 | |
| Mass | 1.057±0.068 M☉ |
| Rotational velocity (v sin i) | 5±3 km/s |
| 88 Tau Ba | |
| Mass | 1.2 M☉ |
| 88 Tau Bb | |
| Mass | >0.15 M☉ |
| Other designations | |
| ADS 3317, CCDM J04356+1010, WDS J04357+1010AB | |
| 88 Tau A: d Tau, 88 Tau, BD+09°607, HD 29140, HIP 21402, SAO 94026, HR 1458, GC 5599 | |
| 88 Tau B: BD+09°606, HD 286909, SAO 94024, GC 5596, TYC 673-1487-1 | |
| Database references | |
| SIMBAD | 88 Tau |
| 88 Tau A | |
| 88 Tau B | |
88 Tauri, also known as d Tauri, is a multiple star system in the constellation Taurus. It has an apparent magnitude of about 4.25, meaning that it is visible to the naked eye. Based upon parallax measurements made by the Hipparcos spacecraft, the star system is some 156 light-years (48 parsecs) from the Sun.
88 Tauri is a sextuple star system, meaning that it contains six stars in a hierarchical orbit. The brighter component, 88 Tauri A, is a quadruple system consisting of two spectroscopic binaries orbiting each other with an orbital period of 18 years. The fainter component, 88 Tauri B, is also a spectroscopic binary, and is about 69 arcseconds away, bringing up the total to six stars.