Visibility IV / V
12 Victoria (A850 RA) The asteroid at the inner edge of the main zone was photographed on the Friday weekend of June 2021, from a clear summer sky. The asteroid of the Clio family was discovered by English astronomer John Russell Hind on September 13, 1850 at George Bishop's Observatory in London. Hind is also known for his discoveries of changing stars and especially for his observations of R Leporis also called the Carmine Red Star of Hind, he has found 10 asteroids visually. Source Wikipedia https://en.wikipedia.org/wiki/John_Russell_Hind .
The naming of the asteroid caused a stir because the name could not be given to the surviving one (Queen Victoria). The name was given according to Roman mythology in the name of the goddess of victory Victoria. Victoria was the daughter of the goddesses Pallas and Styx. Source Wikipedia
There is a 3-D image of the asteroid https://3d-asteroids.space/asteroids/12-Victoria .The large asteroid has a size of 115.08km and a rotation speed of 8.6599h / r. Spectrum class spec_T => S, spec_B => L. When photographed, the asteroid was at a distance of 0.970au and the closest on July 29, 2021 to 0.826au. Shooting took place against a clear summer sky, with L filter 3s exposures for 20 image stacks and a small Interval when other subjects were photographed. JPL Horizon comparison, stack by medieval! We normally use image start times!
1Picture. first image stack of images 1-20 measured, 2021-06-18T 22: 18: 36UT 2459384.42958JDUT 20h42m18.25s -04d58'20.1 "9.56mag Std Dev 18783.555 SNR206.779 FWHM6.460", JPL Horizon 22: 18: 36UT 20h42m18. 27s -04d58'20.7 "9.53mag.
2Picture. middle image 21-40 stack of images measured, 2021-06-18UT 22: 25: 22UT 2459384.43428JDUT 20h42m18.29s -04d58'16.9 "9.603mag Std Dev 17503.598 SNR229.476 FWHM6.320", JPL Horizon 22: 25: 22UT 20h42m18. 28s -04d58'17.9 "9.557mag.
3Picture. last image 41-60 stack of images measured, 2021-06-18UT 22: 34: 30UT 2459384.44062JDUT 20h42m18.29s -04d58'13.7 "9.943mag Std Dev 11734.966 SNR107.595 FWHM8.454", JPL Horizon 22: 34: 30UT 20h42m18. 30s -04d58'14.0 "9.556mg.
No other asteroids below 20.9mag. TYC 5185-186-1 v.11.379mag stars used to calibrate brightness measurement.