PSR B1620−26
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius (M4) |
| Right ascension | 16h 23m 38.2218s |
| Declination | −26° 31′ 53.769″ |
| Apparent magnitude (V) | 21.30 |
| Characteristics | |
| Spectral type | Pulsar / DB |
| Variable type | none |
| Astrometry | |
| Distance | 12,400 ly (3,800 pc) |
| Details | |
| PSR B1620-26 | |
| Mass | 1.35 M☉ |
| Radius | 0.00003 R☉ |
| Radius | 20.85 km |
| Temperature | ≤ 30,000 K |
| Age | 12.2 Gyr |
| WD B1620-26 | |
| Mass | 0.34 M☉ |
| Radius | 0.01 R☉ |
| Radius | 6,950 km |
| Temperature | ≤ 25,200 K |
| Age | 12.2 Gyr |
| Other designations | |
| PSR J1623−2631 | |
| Database references | |
| SIMBAD | data |
PSR B1620−26 is a binary star system located at a distance of 3,800 parsecs (12,400 light-years) in the globular cluster of Messier 4 (M4, NGC 6121) in the constellation of Scorpius. The system is composed of a pulsar (PSR B1620−26 A) and a white dwarf star (WD B1620−26, or PSR B1620−26 B). As of 2000, the system is also confirmed to have an exoplanet orbiting the two stars.