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Ursa Astronomical Association

105 Artemis - 19.6.2021 at 00.19 - 19.6.2021 at 00.36 Orimattila, Artjärvi, Tähtikallio Observation number 99058

Visibility IV / V


105 Artemis (A868 SA) 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 was discovered by American-Canadian astronomer James Craig Watson on September 16, 1868 at the Ann Arbor Observatory in Detroit, Michigan. Professor JC Watson believed he had discovered the hypothetical planet Vulkanus during the 1878 solar eclipse, he has found visually
22 asteroids in total, source Wikipedia https://en.wikipedia.org/wiki/James_Craig_Watson . Detroit Observatory in Ann Arbor
was the first scientific institution at the University of Michigan and one of the oldest observatories in the country. Source Wikipedia
https://en.wikipedia.org/wiki/Detroit_Observatory . The name asteroid is derived from Greek mythology hunting for God Artemis. Artemis is a patron of young girls and their helper. Artemis is the daughter of Zeus and the titaness Leto and the twin sister of Apollo, she was the most revered goddess. Source Wikipedia https://en.wikipedia.org/wiki/Artemis . The size of the asteroid is 94.86km and the rotation speed is 37,150h / r. Spectral class spec_T => C and spec_B => Ch. When photographed, the asteroid was at a distance of 1.09959au and the closest on June 17, 2021 to 1.09942au. The shooting took place against a clear summer sky, with a red filter 5s exposures stacks of 20 images and a small Interval when other subjects were photographed. JPL Horizon comparison, according to the medieval stack! Normally we use image start times!
1Picture. first image 1-20 stack of images measured, 2021-06-18T 21: 21: 09UT 2459384.38969JDUT 18h10m28.64s + 17d21'08.4 "12.044mag Std Dev 6933.784 SNR18.954 FWHM4.726", JPL Horizon 21: 21: 09UT 18h10m28. 64s + 17d21'08.1 "11.506mag.
2Picture. last image 21-40 stack of images measured, 2021-06-18UT 21: 34: 27UT 2459384.39892JDUT 18h10m28.19s + 17d21'10.6 "12.275mag Std Dev 7377.857 SNR28.354 FWHM4.507", JPL Horizon 21: 34: 27UT 18h10m28. 17s + 17d21'09.8 "11.506mag.
No other asteroids below 20.9mag. TYC 1571-2253-1 v.12.24mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 105 Artemis
    • Näyttävä
  • Seeing
    • Mediocre
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter r, bin3 20x5s, 20x5s

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