Visibility III / V
(99248) 2001 KY66 (2001 KY66) The asteroid Apollo / PHA was photographed on the second night of the Stormbonger incident and extraordinary work. This potentially dangerous Apollo asteroid was discovered by the NEAT exploration program at the Palomar Observatory on May 29, 2001. When we photographed, the asteroid was 0.198au away, the closest it was on 13/09/2019 to 0.185au. The size of the asteroid is 1.11km and the rotation speed is 19.7h / r. Spectrum class probably S, source ESO http://www.euronear.org/publications/Popescu_NEA_INT_spec.pdf . When we photographed, the asteroid hit the star in front of the last images, so the last measurable series 8 image was measured. 1Picture first image measured, 2019-09-28T 18: 06: 48UT 2458755.25472JDUT 12h55m49.38s + 65d30'31.0 "16.3mag Std Dev 468.250, JPL Horizon 18: 06: 48UT 12h55m49.68s + 65d30'28.4" 16.44mag.
2Picture. Figure 8 measured, 18: 21: 24UT 2458755.26486JDUT 12h55m43.73s + 65d31'02.2 "16.1mag Std Dev 528.478, JPL Horizon 18: 21: 24UT 12h55m44.06s + 65d30'59.5" 16.44mag.
3Picture. sum view of stack, fast movement is visible. The bright star in the picture 8 Dragonis v. 5,225 mag. No asteroids less than 24.0 mag in the picture. TYC 4168-811-1 v.11.98mag stars used to calibrate brightness measurement.