WDJ181058.67+311940.94
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 10m 58.67s |
| Declination | +31° 19′ 40.94″ |
| Characteristics | |
| Evolutionary stage | White dwarf + White dwarf |
| Astrometry | |
| Distance | 160 ly (49 pc) |
| Orbit | |
| Period (P) | 14.23557 ± 0.00002 h |
| Semi-major axis (a) | 0.01601 ± 0.00015 AU |
| Semi-amplitude (K1) (primary) | 93.9 ± 2.0 km/s |
| Semi-amplitude (K2) (secondary) | 95.7 ± 2.1 km/s |
| Details[1] | |
| A | |
| Mass | 0.834±0.039 M☉ |
| Radius | 0.0101+0.0005 −0.0002 [a] R☉ |
| Luminosity | 0.0082+0.0013 −0.00170.0195+0.0008 −0.0009[b] L☉ |
| Surface gravity (log g) | 8.350+0.066 −0.052 cgs |
| Temperature | 17260+1380 −880 K |
| B | |
| Mass | 0.721 ± 0.020 M☉ |
| Radius | 0.0116±0.0002 R☉ |
| Luminosity | 0.0195+0.0008 −0.0009 L☉ |
| Surface gravity (log g) | 8.164+0.027 −0.030 cgs |
| Temperature | 20000+400 −2000 K |
| Other designations | |
| WDJ181058.67+311940.94 | |
| Database references | |
WDJ181058.67+311940.94 is a white dwarf binary system around 160 light-years (49 pc) away.[1] The total mass of the system is about 1.555 solar masses, above the Chandrasekhar mass.[1] The larger star is around 0.843 solar masses and the smaller star is around 0.721 solar masses.[1] The stars have an orbital period of 14 hours.[2] The two white dwarfs are 1⁄60 astronomical unit (2,500,000 km) from each other.[2] They are approaching each other and will collide in around 22.6 billion years, resulting in a Type Ia supernova.[1] The resulting supernova will have an apparent magnitude of −16.[1]
See also
Notes
References
- ^ a b c d e f Munday, James; Pakmor, Ruediger; Pelisoli, Ingrid; Jones, David; Sahu, Snehalata; Tremblay, Pier-Emmanuel; Rajamuthukumar, Abinaya Swaruba; Nelemans, Gijs; Magee, Mark; Toonen, Silvia; Bédard, Antoine; Cunningham, Tim (2025). "A super-Chandrasekhar mass type Ia supernova progenitor at 49 pc set to detonate in 23 Gyr". Nature Astronomy. 9 (6): 872. arXiv:2504.04522. Bibcode:2025NatAs...9..872M. doi:10.1038/s41550-025-02528-4.
- ^ a b Bassi, Margherita. "Astronomers Discover a Rare White Dwarf Pair Doomed to Explode in a Brilliant Supernova". Smithsonian Magazine. Retrieved 3 February 2026.