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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

(38181) 1999 JG124 - 14.3.2020 at 23.26 - 14.3.2020 at 23.37 Orimattila, Artjärvi, Tähtikallio Observation number 89572

Visibility III / V

(38181) 1999 JG124 (1999 JG124,1992 KN) The Mars-crossing asteroid was photographed on the second night of the March work. The phocae family asteroid was discovered by the LINEAR Socorro exploration program on May 15, 1999. The total estimate is 3.6km. No information on spectrum and rotation. The orbit of the asteroid comes scarcely inside the orbit of the planet Mars. When photographing the asteroid at a distance of 0.768au, the closest it was 0.756au on March 27, 2020. When photographing the target, the asteroid went over a bright star in the last images. 1Picture. first image measured, 2020-03-14 21: 26: 22UT 2458923.39331JDUT 13h35m44.3s + 24d14'43.4 "16.3mag Std Dev 383.031, JPL Horizon 21: 26: 22UT 13h35m43.91s + 24d14'40.8" 16.16mag.
2Picture. last measurable 6-image measured, 21: 36: 49UT 2458923.40056JDUT 13h35m44.15s + 24d14'57.7 "16.2mag. Std Dev 495.166, JPL Horizon 21: 36: 496UT 13h35m44.03s + 24d14'54.4" 16.16mag.
3Picture. sum view of the stack, fast movement is visible. No others under 20.9mag in the picture. TYC 1998-371-1 v.12.52mag stars used to calibrate brightness measurement.

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (38181) 1999 JG124
    • Keskitaso
  • Seeing
    • Good
Technical information

Alluna RC16, C415 / 3320, SBIG 1001E, filter L, 9 x 120s

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