(422787) 2001 WS1, Orimattila, Artjärvi, Tähtikallio

(422787) 2001 WS1 (2001 WS1) The Apollo NEO/PHA asteroid was imaged on the first night of the 2022 November talcos. The asteroid was discovered by the Linear Socorro Discovery Program (704 – Lincoln Laboratory ETS, New Mexico) on November 17, 2001. The entire estimate for the asteroid is 1.6km. The asteroid is one of the Earth-threatening asteroids (PHA), but not within the next 200 years. The destruction forecast for this over 1km site is at least continent-wide destruction! At the time of imaging, the asteroid was at a distance of 0.2492au and at its closest on October 17, 2022 at 0.11095au. The beginning of the captured image series remained on the brighter star and the first measurable image was 13 of the series. The series was saved by the very fast movement of the asteroid!

1Fig. photo of series 13. first measurable image L15s measured, 2022-11-18T 19:03:37UT 2459902.29417JDUT 00h04m48.62s +68d23'05.7" 16.268mag Std Dev 182.345 SNR30.341 FWHM-" ,JPL Horizon 19:03:37m48.62s +68d23'05.7" 68d23'05.7" 16.138mag.

2Fig. last image of series L15s measured, 2022-11-18T 19:05:49UT 2459902.29570JDUT 00h04m49.87s +68d23'06.0" 17.038mag Std Dev 43.640 SNR10.104 FWHM3.970" , JPL Horizon 19:05:49m49.87s +68d23'06.0" 68d23'05.5" 16.138mag.

3Fig. sum picture L15s 1-20 from a stack of pictures, movement is visible. No other asteroids below 20.7mag.

TYC 4294-663-1 v.12.46mag star used for brightness measurement calibration.

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(422787) 2001 WS1 - 18.11.2022 at 21.00 - 18.11.2022 at 21.06 Orimattila, Artjärvi, Tähtikallio Observation number 111308