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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

(137170) 1999 HF1 - 22.4.2022 at 23.10 - 22.4.2022 at 23.32 Orimattila, Artjärvi, Tähtikallio Observation number 106688

Visibility III / V

(137170) 1999 HF1 (1999 HF1) Aten's NEO asteroid was photographed on the first night of the April 2022 work. An audible group of asteroids was discovered by the Loneos exploration program at the Lowel Observatory at Anderson Mesa Station (699) on April 20, 1999. The asteroid 1999 HF1 is the second largest ATEN asteroid, with a size of 3.73km and its moon of about 800m. The rotation time is 2.3192h, the spectral class is SMASSII spec_B => X. We have photographed this subject in the past in connection with the 2019 device days.

1Picture. first image measured, 2022-04-22T 20: 10: 40UT 2459692.34074JDUT 11h41m11.97s + 71d40'27.5 "15.818mag Std Dev 1353.477 SNR211.059 FWHM4.717, JPL Horizon 20: 10: 40UT 11h41m11.90s + 71d40'28.4 "15.224 mag.

2Picture. last image measured, 2022-04-22T 20: 31: 36UT 2459692.35527JDUT 11h41m12.14s + 71d39'49.2 "15.256mag Std Dev 2205.690, JPL Horizon 20: 31: 36UT 11h41m12.16s + 71d39'50.6" 15.224mag.

3Picture. sum view of stack, fast movement is visible. No other asteroids under 24 mag are shown.

TYC 4395-535-1 v.12.33mag stars used to calibrate brightness measurement.

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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