I really find it odd, and disturbing that we can take a picture of a black hole 55 light years away, yet don't know wether we have an extra planet or a grapefruit black hole in our solar system!!! Using 400 AU distance from Earth, a BH 8.9 cm in diameter, the diameter can be resolved optical light near 3E-10 arcsec resolution :) This report also raises questions about primordial BH in the universe, just how many formed in the BB model, say within one second period after the BB?,, Scientists propose plan to determine if Planet Nine is a primordial black hole Postulated distance for Planet Nine is 400 - 800 AU in the report from the Sun. A BH 5 earth masses, Schwarzschild radius about 4.3 cm or so. The paper uses a BH mass ~ 5 earth masses and LSST efforts to find DM too in the outer solar system near the Oort cloud. We also find that LSST could rule out or confirm the existence of trapped planet-mass black holes out to the edge of the Oort cloud, indirectly probing the dark matter fraction in subsolar mass black holes and potentially improving upon current limits by orders of magnitude." We investigate the accretion flares that would result from impacts of small Oort cloud objects, and find that the upcoming LSST observing program will be able to either rule out or confirm Planet Nine as a black hole within a year. "Planet Nine has been proposed to potentially be a black hole in the outer solar system. 'Searching for Black Holes in the Outer Solar System with LSST', "Because black holes are intrinsically dark, the radiation that matter emits on its way to the mouth of the black hole is our only way to illuminate this dark environment," co-author Avi Loeb, the chair of Harvard's astronomy department, said in the same statement. Such accretion causes radiation emission, flashes that briefly shine light on dark and mysterious objects.
"Once they melt, the small bodies are subject to tidal disruption by the black hole, followed by accretion from the tidally disrupted body onto the black hole." "In the vicinity of a black hole, small bodies that approach it will melt as a result of heating from the background accretion of gas from the interstellar medium onto the black hole," study lead author Amir Siraj, an undergraduate astronomy student at Harvard University, said in a statement. The LSST observing program will also be able to spot a potential black-hole signature, the new study reports - "accretion flares" that result when black holes gobble up comets or other small objects.
For example, LSST data will allow astronomers to probe the nature of mysterious dark energy and dark matter, find and track large numbers of potentially hazardous asteroids and study our Milky Way galaxy's formation and evolution, among other things. The Rubin Observatory will be incredibly sensitive and scan large swaths of sky repeatedly, a combination that will provide an unprecedented wealth of data, scientists have said. Rubin Observatory, a big telescope under construction in the Chilean Andes, is scheduled to begin a wide-ranging, decade-long survey of the southern sky called the Legacy Survey of Space and Time (LSST) in late 2022.
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