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

Ursa Astronomical Association

(163899) 2003 SD220 - 4.12.2021 at 16.59 - 4.12.2021 at 17.21 Orimattila, Artjärvi, Tähtikallio Observation number 103097

Visibility IV / V


(163899) 2003 SD220 (2003 SD220,2000 AD229) The asteroid NEO NEO / PHA was photographed on the second night of the December work. The Slow Group of Asteroids was discovered by the Loneos exploration program at the Lowel Observatory at Anderson Mesa Station (699) on September 29, 2003. The size of the asteroid is 0.791km and the rotation time is 285h / r. According to NEOWISE observations, the spectral class estimate of Sr. This asteroid of Aten orbits the Earth every 0.75 (275 days) every year. There are radar series on the asteroid, source Wikipedia https://en.wikipedia.org/wiki/(163899)_2003_SD220 . When photographed, the asteroid was 0.05484au away and the nearest 17.12.2021 0.03628au. The description time was too long for this object, I had to measure it from an elongated image, maybe for this reason the measurement values also differed unusually much from the predictions? The orbit of the asteroid goes inside the orbit of Venus every turn, but stays inside the orbit of Earth, so both planets have a strong effect on the orbit, can this explain the difference? This asteroid is also the most easily accessible destination for space travel and possible up to 178 days of travel time. Source Spacereference https://www.spacereference.org/asteroid/163899-2003-sd220 .

1Picture. first image in the series1 L120s measured, 2021-12-04UT 14: 59: 26UT 2459553.12460JDUT 18h01m14.25s + 75d50'58.0 "13.828mag Std Dev 1402.216 SNR175.057 FWHM5.350", JPL Horizon 14: 59: 26UT 18h01m13.42s + 75d50'58.0 "13,971 mag.

2Picture. last image in the series11 L120s measured, 2021-12-04UT 15: 20: 22UT 2459553.13914JDUT 18h01m43.71s + 75d49'58.7 "13.747mag Std Dev 2636.960 SNR485.276 FWHM6.074", JPL Horizon 15: 20: 22UT 18h01m41.63s + 75d50'03.5 "13,971 mag.

3Picture summary image of the L120s 1-11 stack of images, fast motion is displayed. No other asteroids below 24.0 mag are shown. Close-up bright stars HD 166655-B 9.9mag and HD 166655 7.08mag in the picture. TYC 4569-2177-1 v. 12.0mag stars used to calibrate brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • (163899) 2003 SD220
  • Seeing
    • Average
Technical information

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

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