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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

54598 Bienor - 22.4.2022 at 23.03 - 23.4.2022 at 00.41 Orimattila, Artjärvi, Tähtikallio Observation number 106748

Visibility I / V

54598 Bienor (2000 QC243) The centaur was filmed on the first night of the April 2022 campaigns. The DES search program discovered the asteroid on August 27, 2000 at the Cerro Tololo Inter-American Observatory in Chile. 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 photographing the asteroid was 14,465au away. We have photographed this object earlier in the March 2022 work. Now we photographed with the method of two observations where the interval between exposures was about 2h. This distant object required it to make the movement properly visible. The description consisted of 3 120s of exposure. There are about 10 detectable Kuiperoids in our equipment, a brightness of less than 20 magnitudes is required for the measurement.

Figure 1. 3x120s image sum measured, 2022-04-22T 20: 02: 37UT 2459692.33515JDUT 05h22m42.50s + 42d08'40.1 "19.650mag Std Dev 168.050 SNR1.375 FWHM3.775", JPL Horizon 20: 02: 37UT 05h22m42.97s + 42d '36 .6 "19.289mag.

Figure 2. 3x120s sum image measured, 2022-04-22T 21: 41: 17UT 2459692.40366JDUT 05h22m44.31s + 42d08'32.7 "19.454mag Std Dev 129.230 SNR1.041 FWHM-", JPL Horizon 21: 41: 17UT 05h22m44.31s + 42d0 33.0 "19.289 mag.

Figure 3. A snapshot of all images showing each separate observation. The motion is described by a short vertical line between the alignment lines. No other asteroids less than 22.8mag in the image.

TYC 2917-2262-1 v.12.03mag star 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, 3 x 120s

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