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Hi! This is from last night. Taken at Taurus Hill Observatory, Finland. Florence is still quite bright but relative speed to background stars has slowed down alot as the asteroid moves away from Earth. Perioid seems to be approx. 2,4 hours. In the second image I stacked 1 hour of 60s sub-exposures to show movement of the asteroid.
NEO Asteroid 3122 Florence should become visible in binoculars next week. It will pass at 18.4 LD (0.047 AU, 7 million km) at 12:06 UT on 2017 September 01. The magnitude predictions are uncertain, but although it may be near the limit of visibility for smaller binoculars, it should be relatively easy in 70mm or larger apertures at least until the Moon begins to interfere at the beginning of September.
The asteroid, which has a diameter somewhere between 4 and 9 km (we should know this more precisely after this pass) is named for Florence Nightingale and will not pass this close again for another 50 years. Although it is classified as a PHA (potentially hazardous asteroid) it will not become an impact threat at least for the next few centuries.
Chart generated with Guide v9.1.