Visibility I / V
1264 The asteroid on the outer edge of the main zone of Letaba (1930 WC, 1933 HG, 1954 YB, 1962 HB, 1964 VB) was photographed on a Saturday weekend in June 2021, from a clear summer sky. The asteroid was discovered by the South African astronomer Cyril V. Jackson (1903-1988) at the Union Observatory (078) in Johannesburg on 21 April 1933. Cyril Jackson has found a total of 72 asteroids and comets 47P / Ashbrook-Jackson, 58P / Jackson- Neujmin. Source Wikipedia https://en.wikipedia.org/wiki/Cyril_Jackson_(astronomer) . The asteroid is named after Letaba from South Africa
from the river (Letaba, Lehlaba or Ritavi). Letaba flows into the Olifants River in Kryger National Park, the Olifans River is also called the Elephant River in Mozambique, which it flows into Lake Massingir. Source Wikipedia https://en.wikipedia.org/wiki/Letaba_River . The size of the asteroid is 66.04km and the rotation speed is 32.74h / r. Spectrum type spec_B => C. At the time of filming, the asteroid was 1,977au apart and the closest on July 13, 2021 to 1,728au. Shooting took place against a clear summer sky, with an R filter with 8s of exposures in stacks of 20 images and a small Interval during which other subjects were photographed. Measurement stacks were taken from 5 images in the series without calibration.
1Picture. first image stack of 1-5 images measured, 2021-06-19UT 21: 46: 26UT 2459385.40724JDUT 21h38m23.40s + 19d28'20.0 "15.308mag Std Dev 352.402 SNR1.932 FWHM6.050", JPL Horizon 21: 46: 26UT 21h38m23. 35s + 19d28'17.0 "14.246mag.
2Picture. last image 36-40 stack of images measured, 2021-06-19UT 22: 28: 44UT 2459385.43662JDUT 21h38m23.40s + 19d28'41.5 "14.610mag Std Dev 355.618 SNR7.975 FWHM7.065", JPL Horizon 21: 38: 44UT 20h36m23. 44s + 19d28'40.2 "14.246mag.
No other asteroids below 21.6mag. TYC 1673-699-1 v.12.43mag stars used to calibrate brightness measurement.