Florence, the 4.4 km asteroid with an estimated diameter has increased to 7 million km from the Earth, about 18 times the Earth-Moon distance: it was 14.06 Italian time on 1 September.
The relatively close passage (in astronomical terms) was the occasion to study this kind of celestial objects.
At the Astronomical Park of Isnello (Palermo) astronomers and amateur astronomers set out to hunt Florence and took the pictures below (and the one at the opening).
3122 Florence has a rotation period of 2.35 hours during which its brightness varies by 0.2 magnitudes.
The GAL Hassin Foundation of Isnello, with the RILA telescope with a diameter of 420 mm F / 3.8, observed and monitored the asteroid during the night of August 31, 2017 from 9:30 pm to 11:30 pm, obtaining a sequence of images.
The animation reproduced is the sum of 154 individual images obtained in sequence. 30 second exposures, in binning 3, with CCD camera cooled to -10 °.
Florence ranks fourth among the Near Earth asteroids, after 53319 1999 JM8 (about 7 kilometers in diameter), 4183 Cuno (5.6 kilometers) and 3200 Phaethon (5.1 kilometers).
Discovered in March 1981, the asteroid was named in honor of Florence Nightingale, the founder of modern nursing.