Visibility II / V
(21116) 1992 SO (1992 SO, 1998 FZ105) The asteroid on the inner edge of the main zone was photographed on the Sunday of the September 2017 DS weekend. When photographing Finland 100 asteroids 1699 Honkasalo this came according to the picture. The Vesta family of asteroids was discovered by Japanese amateur astronomer Atsushi Sugie on September 26, 1992 at the Dynic Astronomical Observatory (402). Atsushi Sugie has found a total of 122 asteroids, source Wikipedia
https://en.wikipedia.org/wiki/Atsushi_Sugie . The total estimate is 3.0km. Rotation speed 69.3549h / r. The spectral class of the family, according to the red stone, corresponds to HED meteorites, source Wikipedia https://en.wikipedia.org/wiki/V-type_asteroid . When photographed, the asteroid was 1,688au at a distance and closest on November 22, 2017 to 1,348au.
1Picture. first picture measured, 2017-09-25T 01: 08: 30UT 2458021.54756JDUT 04h47m02.24s + 24d30'28.1 "17.208mag Std Dev 126.539 SNR13.687 FWHM5.026", JPL Horizon 01: 08: 30UT 04h47m02.23s + 24d30 ' 28.2 "18.473 mag.
2Picture. last image measured, 2017-09-25UT 01: 27: 24UT 2458021.56069JDUT 04h47m02.76s + 24d30'28.1 "17.260mag Std Dev 152.288 SNR9.890 FWHM6.193", JPL Horizon 01: 27: 24UUT 04h47m02.68s + 24d30 ' 27.9 "18.473 mag.
3Picture. Summary image of a stack, movement is visible. Asteroid 1699 Honkasalo 16.2mag, motion visible. Asteroid (83969) 2001 YW127 19.7mag, motion creeps.
Asteroid (29998) 2000 AG137 19.7mag, motion shown. Asteroid (442473) 2011 US305 20.8mag maybe visible? No other asteroids below 20.9mag.
USNO-A 04d48m47s + 24d24'56 "r.13.6mag stars used to calibrate brightness measurement.