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Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

(434431) 2005 NC7 - 4.9.2021 at 02.28 - 4.9.2021 at 02.51 Orimattila, Artjärvi, Tähtikallio Observation number 101233

Visibility III / V


(434431) 2005 NC7 (2005 NC7) The asteroid Mars Crossing was photographed on the first night of the September 2021 work. An unusual asteroid was discovered by Spacewatch (code 691) at the Kitt Peak National Observatory on July 5, 2005. Unusual asteroids are those with unusual orbital properties such as comet-like large eccentricities and orbital slopes, source Wikipedia
https://en.wikinew.wiki/wiki/Unusual_minor_planet . Total estimate 3.4km. When photographed, the asteroid was 0.496au at a distance and 0.475au at its nearest September 19, 2021.
1Picture. first image in the series1 L120s measured, 2021-09-03UT 23: 28: 11UT 2459461.47790JDUT 23h28m38.64s -03d41'00.2 "16.006mag Std Dev 390.418 SNR74.726 FWHM4.839", JPL Horizon 23: 28: 11UT 23h28m38.61s - 03d40'59.6 "16.193mag.
2Picture. last image in the series11 L120s measured, 2021-09-03UT 23: 50: 51UT 2459461.49364JDUT 23h28m39.26s -03d41'24.9 "16.021mag Std Dev 371.138 SNR98.798 FWHM5.912", JPL Horizon 23: 50: 51UT 23h28m39.21s - 03d41'24.8 "16.193mag.
3Picture sum view of L120s 1-11 stack of images, motion is displayed. Asteroid (21012) 1988 RU9 17.554mag, motion shown. Asteroid (40136) 1998 QS56 18.404mag, motion shown. Asteroid (248088) 2004 RL13 18.948mag, motion shown. Asteroid (115942) 2003 WR29 18,850mag, motion shown. Asteroid (157802) 1995 SV40 19.429mag, motion shown. No other asteroids under 19.9mag are shown. The picture also shows a star marked "Variable", the last one in the 4-star sequence, according to the DSS image as dim as the others in the sequence, can it be an IR star? In our picture at least 2mag brighter.
Measured star 23h28m21.7s -03d43'59.7 "15.677mag! TYC 5247-241-1 v. 11.811mag stars used to calibrate brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Seeing
    • Good
  • Name of the observation target
    • (434431) 2005 NC7
Technical information

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

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