Contact information

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

Ursa Astronomical Association

306 Unitas - 10.4.2021 at 21.56 - 10.4.2021 at 22.07 Orimattila, Artjärvi, Tähtikallio Observation number 97889

Visibility III / V


306 Unitas (A891 EA) The asteroid at the inner edge of the main zone was photographed on the second night of the April 2021 work. The asteroid was discovered by an Italian
astronomer Elia Filippo Francesco Giuseppe Maria Millosevich at the Roman Observatory (Collegio Romano) on March 1, 1891. Professor Elia Millosevich specializes in orbiting asteroids and comets and has found 2 asteroids, source Wikipedia
https://en.wikipedia.org/wiki/Elia_Millosevich .
The asteroid is named after the Jesuit astronomer Angelo Secchi from the book "L'Unita Della Forze Fisiche Saggio Di Filosofia Naturale".
Astronomer physicist Jesuit Angelo Secchi is the first to officially testify to the sun as a star and developed a spectroscope
use of astrophysics. He has found 3 comets. Source Wikipedia https://en.wikipedia.org/wiki/Angelo_Secchi . The size of the asteroid is 47.20km and the rotation speed is 8.736h / r. Spectral class spec_T => S and spec_B => S. When photographed, the asteroid was at a distance of 2,353au and the closest on January 27, 2021 to 1,729au.
1Picture. First image measured, 2021-04-10T 18: 55: 56UT 2459315.28884JDUT 08h09m30.52s + 20d04'37.9 "13.865mag Std Dev 2119.186 SNR161.432 FWHM4.526", JPL Horizon 18: 55: 56UT 08h09m30.44s + 20d04 ' 37.4 "13.884 mag.
2Picture. Last image measured, 2021-04-10T 19: 06: 48UT 2459315.29638JDUT 08h09m30.79s + 20d04'37.4 "13.906mag Std Dev 1903.751 SNR206.594 FWHM4.736", JPL Horizon 19: 06: 48T 08h09m30.71s + 20d04 ' 37.4 "13.884 mag.
3Picture. Summary image of the stack, motion not visible. Asteroid 12050 Humecronyh 18,722mag, motion shown. Asteroid (53010) 1998 VW8 19.683mag, motion shown. Asteroid (78738) 2002 TT267 20.080mag, motion shown. No other detectable asteroids below 20.4mag. TYC 1385-484-1 v.12.41mag stars used to calibrate brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 306 Unitas
    • Keskitaso
  • Seeing
    • Excellent
Technical information

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

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