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Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

654 Zelinda - 17.7.2021 at 00.13 - 17.7.2021 at 01.24 Orimattila, Artjärvi, Tähtikallio Observation number 99975

Visibility III / V


654 Zelinda (A908 AM, 1908 BM, 1965 QG) The asteroid on the inner edge of the main zone was photographed on the Friday weekend of July 2021, at a time of enjoyable twilight. The asteroid was discovered by the German astronomer August Kopff on January 4, 1908 at the Heidelberg-Königstuhl Observatory (024). The name asteroid is given to Zelinda Dini, the sister of the Italian mathematician Ulisse Dini (1845-1918), Dini were again friends of the astronomer Elia Millosevich. The size of the large asteroid is 160.73km and the rotational speed is 31.735h / r. Spectral class spec_T => C, spec_B => Ch. When photographed, the asteroid was at a distance of 2,053au and the closest on August 31, 2021 to 1,803au.
1Picture. image of the first series1 R30s measured, 2021-07-16UT 21: 12: 48UT 2459412.38797JDUT 22h30m21.02s + 11d03'15.2 "13.608mag Std Dev 581.215 SNR17.650 FWHM4.175", JPL Horizon 21: 12: 48UT 22h30m21.05s + 11d03'15.1 "13.366 mag.
2Picture. picture of the last series11 L20s measured, 2021-07-16UT 22: 24: 16UT 2459412.43351JDUT 22h30m19.61s + 11d03'35.4 "13.528mag Std Dev 1103.561 SNR43.318 FWHM4.141", JPL Horizon 22: 31: 29UT 22h30m19.64s + 11d03'34.9 "13.365 mag.
3Picture sum view of L20s 1-11 image stack, no motion detected. No other asteroids under 18.8mag are shown. TYC 1154-1767-1 v.12.14mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 654 Zelinda
    • Keskitaso
  • Seeing
    • Average
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, bin3, R11 x30s, 11xL20s

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