Gaia18ajz

Gaia 18ajz

Object type	Black hole
Other designations	AT2018uh
Observation data (Epoch J2000)
Constellation	Scutum
Right ascension	277.56025 -8.22021
Declination	18:30:14.46 -08:13:12.76
Distance	1.14-1.31 kpc
Apparent magnitude	14.23 ±0.05, 12.81 ±0.1, 12.31 ±0.04, 17.52 ±0.16
Mass	4.9-11.1 solar masses

Gaia18ajz is a candidate black hole that was discovered through a microlensing event. Its mass and distance is not exactly known but it can either be located 1.14 kiloparsecs from earth with a mass of 4.9 solar masses or located at a distance of 1.31 kiloparsecs from earth with a mass of 11.1 solar masses. ^[1]

It was discovered in 2018 by the Gaia Science Alerts system through gravitational microlensing. ^{[1] [2]}

References

1. Howil, K.; Wyrzykowski, Ł; Kruszyńska, K.; Zieliński, P.; Bachelet, E.; Gromadzki, M.; Mikołajczyk, P. J.; Kotysz, K.; Jabłońska, M. (2024-10-11), Uncovering the Invisible: A Study of Gaia18ajz, a Candidate Black Hole Revealed by Microlensing, arXiv, doi:10.48550/arXiv.2403.09006, arXiv:2403.09006, retrieved 2025-07-30
2. "Gaia18ajz". gsaweb.ast.cam.ac.uk. Retrieved 2025-07-30.