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Contact information

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

Ursa Astronomical Association

Solar system - 4.9.2021 at 03.01 - 4.9.2021 at 03.22 Orimattila, Artjärvi, Tähtikallio Observation number 101087

Visibility II / V


(21601) 1998 XO89 (1998 XO89,2000 AK195) The Trojan asteroid of Jupiter was photographed on the first night of the September 2021 troops. The L4 Athenian group of asteroids were discovered by the LINEAR Socorro exploration program, (704 Lincoln Laboratory ETS, New Mexico) on December 15, 1998. The size of the asteroid is 54.90km and the rotational speed is 12.65h / r. Estimated spectral class dark C. When photographed, the asteroid was at a distance of 5,096au and the closest on December 6, 2021 to 4,108au.
1Picture. first image in the series1 L120s measured, 2021-09-04UT 00: 01: 15UT 2459461.50086JDUT 04h58m15.91s + 29d09'31.3 "18.166mag Std Dev 92359 SNR10.832 FWHM3.445", JPL Horizon 00: 01: 15UT 04h58m15.92s + 29d09'30.7 "17.888 mag.
2Picture. last image in the series11 L120s measured, 2021-09-04UT 00: 22: 11UT 2459461.51540JDUT 04h58m16.32s + 29d09'31.5 "18.123mag Std Dev 111.195 SNR10.921 FWHM3.165", JPL Horizon 00: 22: 11UT 04h58m16.30s + 29d09'30.9 "17.888 mag.
3Picture sum view of L120s 1-11 stack of images, motion is displayed. Asteroid (39212) 2000 XC38 19.266mag, motion not shown. Asteroid (82483) 2001 OH34 19.825mag, motion visible dim. (34083) Feretova 19.557mag, movement is dim. Asteroid (44468) 1998 VH34 very scarce outdoors.
No other asteroids under 19.9mag are shown. TYC 1844-1278-1 v.12.08mag stars used to calibrate the brightness measurement.


Additional information
  • Observation target
    • Asteroid
  • Seeing
    • Good
  • Name of the observation target
    • (21601) 1998 XO89
Technical information

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

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