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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

(137170)1999 HF1 - 25.3.2022 at 22.31 - 25.3.2022 at 22.52 Orimattila, Artjärvi, Tähtikallio Observation number 106018

Visibility III / V

(137170) 1999 HF1 (1999 HF1) The Aten NEO / PHA Earth-Venus crosser asteroid was photographed on the first night of the March 2022 work. The dual asteroid was discovered by the Lowell Anderson Mesa Observatory's LONEOS exploration program on April 20, 1999. Venus and Earth are playing celestial ping-pong with this duplicate. 1999 The asteroid HF1 is the second largest asteroid of ATEN, with a size of 3.73km and a moon of about 800m. Rotation time 2.3192h, spectrum class SMASSII spec_B => X. We have photographed this subject in the past 2019. When imaging the asteroid was 0.21130au away, the closest it was 0.182au on March 16, 2022. The imaging time 120s was too long for this object, I compensated for it by moving the measurement object in the imaging wire, the location is marked. Also the comparison time of the last picture added by 1 minute.

1Picture. stacked 1-11 images L120s summary image according to the stars, very fast motion is shown. No other asteroids below 24.0 mag are shown.

2Picture. first picture measured, 2022-03-25T 19: 31: 00UT 2459664.31319JDUT 23h41m30.30s + 71d34'01.6 "14.704mag Std Dev 1353.609 SNR21.645 FWHM5.809", JPL Horizon 19: 31: 00UT 23h41m30.37s + 71d33 ' 56.3 "14.594 mag.

3Picture. last image measured, 2022-03-25UT 19: 52: 54UT 2459664.32840JDUT 23h41m30.93s + 71d36'13.1 "14.614mag Std Dev 1351.065 SNR46.614 FWHM7.242", JPL Horizon 19: 52: 54UT 23h41m30.93s + 71d36 ' 10.6 "14.594mag. TYC 4487-30-1 used to calibrate the brightness measurement 11.82mag stars.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (137170)1999 HF1
  • Seeing
    • Average
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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