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Timing accuracy

The accuracy of the timing given in the FITS header of ALFOSC data has been measured during two timing assessment campaigns organized by the International Asteroid Warning Network (IAWN) consisting of observing near-Earth asteroids at close fly-by.

The result from both campaigns gives that the ALFOSC timings are delayed by 0.4 seconds.
This is believed to be due to the ALFOSC shutter.

During 2021 November 9-11 2019 XS was observed with ALFOSC, as well as other 66 observatories, at a maximum differential tracking rate of 3.8" per second.
The final results are published in Farnocchia et al. 2022, and the specific ALFOSC/NOT results are Z23_IAWN_2019XS_results.

During 2022 November 23-24 2005 LW3 was measured when approaching Earth at 2.97 lunar distances at a maximum differential tracking rate of 2.4" per second.
Final analysis and a publication is pending.

Thanks to Mikael Granvik and Marco Micheli for initiating our participation and for analysing and submitting the data to IAWN in the ADES format.

Back to top Last modified: April 19 2023