Hubble and Webb identified a stellar-mass black hole in Omega Centauri
Astronomers combined more than 20 years of Hubble astrometry with Webb measurements to find a visible star orbiting an unseen object in Omega Centauri. The object's inferred mass is about 4.46 solar masses, and the binary's orbital period is 94 years. This is the first stellar-mass black hole identified in the cluster; the measurements do not yet reveal the full population predicted by models.
The record ends here. Everything below this line is invented.
What if the only way to find a black hole were to watch one star for a lifetime?
Part one
The Ninety-Four-Year Orbit
Every year on the same date, Arin added one position to the star's path. Her mother had started the record; Arin had inherited the telescope archive and the 94-year orbit it was trying to complete. The star moved a fraction of a pixel, too little for an impatient observer and enough for a patient one.
The black hole's mass had been measured from the visible companion's motion, not from light around the dark object. The archive had gathered more than twenty years of positions before Arin took over. Her daughter had just entered the training program and wanted to replace the old telescope with a faster survey. The observatory could fund one more decade of precision work, but not both.
Arin had until midnight to choose the next target schedule. If she gave the telescope to the survey, the orbit would remain unfinished for years. If she kept the long baseline, another cluster would wait without a search. She looked at the path her mother had traced in pencil and added the latest point. The star's curve bent inward, toward a place the model had marked empty. Arin handed the pencil to her daughter.
What’s real
- The black hole mass is about 4.46 solar masses.
- Its visible companion has a 94-year orbital period.
- The discovery used more than 20 years of Hubble data.
What’s invented
- Arin, her mother, and the telescope archive are fictional.
- The daughter and telescope allocation decision are invented.
- The source does not complete the 94-year orbit.
Part two: The Next Point
Part two isn’t on sale yet. Check back soon.