Melnick 34
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 5h 38m 44.26s |
| Declination | −69° 06′ 05.88″ |
| Apparent magnitude (V) | 13.09 |
| Characteristics | |
| Evolutionary stage | Wolf–Rayet star |
| Spectral type | WN5h + WN5h |
| B−V color index | +0.25 |
| Astrometry | |
| Radial velocity (Rv) | 287±5 km/s |
| Proper motion (μ) | RA: 1.848 mas/yr Dec.: 0.490 mas/yr |
| Distance | 163,000 ly (49,970 pc) |
| Absolute magnitude (MV) | −7.42 |
| Orbit | |
| Period (P) | 154.55±0.05 d |
| Eccentricity (e) | 0.68±0.02 |
| Inclination (i) | ~50° |
| Periastron epoch (T) | 57671.2±0.9 JD |
| Argument of periastron (ω) (secondary) | 20.9±3.8° |
| Semi-amplitude (K1) (primary) | 130±7 km/s |
| Semi-amplitude (K2) (secondary) | 141±6 km/s |
| Details | |
| A | |
| Mass | 148 M☉ |
| Radius | 19.3±2.8 R☉ |
| Luminosity | 2,042,000 L☉ |
| Temperature | 53,000±1,200 K |
| Age | 0.5±0.3 Myr |
| B | |
| Mass | 135 M☉ |
| Radius | 18.2±2.7 R☉ |
| Luminosity | 1,585,000 L☉ |
| Temperature | 53,000±1,200 K |
| Age | 0.6±0.3 Myr |
| Other designations | |
| BAT99-116, Melnick 34, 2MASS J05384424-6906058, Brey 84 | |
| Database references | |
| SIMBAD | data |
Melnick 34 (abbreviated to Mk34), also called BAT99-116, is a binary Wolf–Rayet star near R136 in the 30 Doradus complex (also known as the Tarantula Nebula) in the Large Magellanic Cloud. Both components are amongst the most massive and most luminous stars known, and the system is the most massive known binary system.