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Contact information

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

Ursa Astronomical Association

(100006)1987 DA7 - 25.3.2022 at 23.02 - 25.3.2022 at 23.23 Orimattila, Artjärvi, Tähtikallio Observation number 106007

Visibility III / V


(100006) 1987 DA7 (1987 DA7.2000 VJ39) The asteroid Mars-Crosser was photographed on the first night of the March 2022 work. The asteroid was discovered by the Belgian astronomer Henri Debehogne on 28 February 1987 at the Eson La Silla Observatory (809 European Southern Observatory, La Silla). Henri Debehogne has found a total of 741 asteroids. Source Wikipedia https://en.wikipedia.org/wiki/Henri_Debehogne . The total estimate for the asteroid is 2km and the rotation speed is 3.9422h / r. When photographed, the asteroid was 0.45580au away, the closest it was 0.44897au on March 16, 2022. This Mars crosser only comes a little inside the orbit of Mars, so it doesn’t come very close.

1Picture. stacked 1-11 images L120s sum of the stars, motion is shown. Asteroid (6067) 1990 QR11 16.277mag, motion shown. Asteroid (139678) 2001 QG205 18.741mag, motion shown. No asteroids less than 20.4 mag in the picture.

2Picture. first measured 43.8 "15.522 mag.

3Picture. last image measured, 2022-03-25UT 20: 23: 16UT 2459664.34949JDUT 11h57m05.60s -11d43'44.2 "15.782mag Std Dev 238.022 SNR49.805 FWHM5.577", JPL Horizon 20: 23: 16UT 11h57m05.61s -11d43 ' 44.0 "15.522mag. TYC 5521-631-1 11.266mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (100006)1987 DA7
  • Seeing
    • Average
Technical information

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

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