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Skywarden,
Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

279 Thule - 7.8.2021 at 02.08 - 7.8.2021 at 02.19 Orimattila, Artjärvi, Tähtikallio Observation number 100625

Visibility I / V


273 Thule (A888 UA, 1927 EC, 1954 FF, A920 GA, A923 RA) The asteroid on the outer edge of the main zone was imaged on the first night of the August 2021 work. The Asteroid of the dynamic Thule group in the 4: 3 resonance of the Jupiter orbit was discovered by Johann Palisa at the Wine Observatory on October 25, 1888. Source Wikipedia #Thule_asteroids "> https://en.wikipedia.org/wiki/279_Thule #Thule_asteroids The name asteroid comes from a mysterious northern place
Thulesta. Thule is often connected to northern Norway and also to Iceland, Greenland and elsewhere. Source Wikipedia
https://en.wikipedia.org/wiki/Thule . The size of the asteroid is 126.5km and the rotation speed is 23.896h / r. Spectrum class spec_T => D, spec_B => X. When photographed, the asteroid was 3,841au at a distance and the nearest 18 October 2021 3,215au.
1Picture. first image in the series1 L60s measured, 2021-08-06UT 23: 08: 16UT 2459433.46407JDUT 01h48m15.99s + 08d51'08.8 "14.832mag Std Dev 231.840 SNR30.720 FWHM4.552", JPL Horizon 23: 08: 16UT 01h48m15.96s + 08d51'08.2 "15.361mag.
2Picture. last image in the series11 L60s measured, 2021-08-06UT 23: 19: 10UT 2459433.47164JDUT 01h48m16.11s + 08d51'09.5 "14.983mag Std Dev 240.368 SNR29.776 FWHM4.793", JPL Horizon 23: 19: 10UT 01h48m16.05s + 08d51'08.2 "15.361mag.
3Picture sum view of L60s 1-11 stack of images, motion not displayed. No other asteroids under 19.6mag are shown. TYC 622-409-1 v.12.67mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 279 Thule
  • Seeing
    • Average
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 60s

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