Fig. 8: Search for potential activity.
a Raster plot in ecliptic coordinates (longitude λ, latitude β) showing the spin-axis orientation search space. Contour lines represent the χ2 values of the model fit to optical and radar astrometry, relative to the minimum. The global minimum is located at (λ, β) = (215°, + 60°), with an antipodal solution at (35°, − 60°). Black dots indicate grid points where the derived dynamical parameter C0 is non-physical (C0 < 0) and should be excluded. Crosses mark the four spin-axis solutions obtained from lightcurve inversion using the SAGE modeling technique. b Profile of 1998 KY26 extracted from the superstack image obtained with Gemini observations on 31 May 2024. Small dots represent individual pixels; black line and circles, the average profile; the red line is the scaled average profile of several field stars. The fluxes are in detector units. Vertical error bars represent the 1σ uncertainties in the measured flux, in analogue-to-digital units (ADU). The profile emphasizes the high signal-to-noise region (0-1 arcsec) and includes a portion of the lower signal-to-noise regime (1–2 arcsec) for context.
