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Contact information

Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Solar system - 4.9.2021 at 01.58 - 4.9.2021 at 02.20 Orimattila, Artjärvi, Tähtikallio Observation number 101188

Visibility III / V


2920 Automedon (1981 JR) The Trojan asteroid of Jupiter was photographed on the first night of the September 2021 work. The L4 Athenian group of asteroids was discovered by American astronomer Edward LG "Ted" Bowell Loneos in a search program at the Lowel Observatory at Anderson Mesa Station (688-Lowell Observatory, Anderson Mesa Station) on May 3, 1981. Ted Bowel has found a total of 571 asteroids and comets 140P / (Bowell-Skiff) and C / 1980 E1 (Bowell). The asteroid is named after a Greek mythology soldier from Automedo. In the Trojan War, when Patroclus was killed while leading a battle in the armor of Achilles and his horses, Automedon continues to fight his
in his armor and horses, and in retaliation to kill the Trojan Aretus. source Wikipedia https://en.wikipedia.org/wiki/Automedon .
The narrative is ambiguous and unclear, this was my interpretation. The size of the large asteroid is 88.57km and the rotation speed is 88.57h / r. Spectrum class spec_B => D dark, also assumption C possible. When photographed, the asteroid was at a distance of 4,498au and the closest on November 5, 2021 to 4,108au.
1Picture. first image in the series1 L120s measured, 2021-09-03UT 22: 58: 26UT 2459461.45724JDUT 02h52m47.86s + 22d47'22.2 "16.779mag Std Dev 527.006 SNR83.140 FWHM3.655", JPL Horizon 22: 58: 26UT 02h52m47.89s + 22d47'21.3 "16.339 mag.
2Picture. last image in the series11 L120s measured, 2021-09-03UT 23: 19: 20UT 2459461.47175JDUT 02h52m47.88s + 22d47'21.7 "16.919mag Std Dev 257.534 SNR51.556 FWHM4.979", JPL Horizon 23: 19: 20UT 02h52m47.91s + 22d47'20.6 "16.339 mag.
3Picture sum view of L120s 1-11 image stack, motion not displayed. Asteroid (61644) 2000 QE109 19.848mag, motion is dimmed. No other asteroids below 19.9mag are shown. TYC 1781-1018-1 v.12.49mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Seeing
    • Good
  • Name of the observation target
    • 2920 Automedon
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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