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Contact information

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

Ursa Astronomical Association

54598 Bienor - 27.3.2022 at 01.01 - 27.3.2022 at 01.06 Orimattila, Artjärvi, Tähtikallio Observation number 106279

Visibility I / V


54598 Bienor (2000 QC243) The centaur asteroid was photographed on the second night of the March 2022 work. (Taxonomy Gray BR) Centaur discovered by Deep Ecliptic Survey (DES) Centaur Search Program (807) Cerro Tololo Observatory on Mount La Serena on August 27, 2000. The DES search program had focused on the search for asteroids in the Kuiper belt, with Robert L. Millis as principal investigator. The search program has found a total of 9 asteroids. Source Wikipedia https://en.wikipedia.org/wiki/Deep_Ecliptic_Survey . The asteroid is named after the Greek mythology Centaur Bienor. Bienor and the other centaurs tried to steal women from the wedding of King Pirithous and Hippodamia (ruler of the horses). In the ensuing skirmish, Bienor died. The lapiths, led by the hero Theseus, won the battle and rescued the women and young boys from the hooves of the Centaurs. Source Wikipedia https://en.wikipedia.org/wiki/Bienor_(mythology) . The size of the asteroid is 187.5km and the rotation speed is 9.14h / r. The asteroid will enter Perihel in January 2028 13.2au. When photographed, the asteroid was 14,1010au away. The comets 29P / Schwassmann-Wachmann and 39P / Oterma, which we have often described, resemble centaurs to whom they have also been called. source Wikipedia https://en.wikipedia.org/wiki/Centaur_(small_Solar_System_body) . The measurement was challenging, because of the close star.

Picture. 3x120s sum of images measured, 2022-03-26T 22: 03: 42UT 2459665.41923JDUT 05h15m15.37s + 42d37'57.9 "19.05mag Std Dev 104.256 SNR2.126 FWHM-", JPL Horizon 22: 03: 42UT 05h15m15.30s + 42d37 ' 57.7 "19.277 mag. No other asteroids below 21.4 mag.

TYC 2904-1544-1 v.11.91mag stars used to calibrate brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 54598 Bienor
  • Seeing
    • Good
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 3 x 120s

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