Fig. 4: Overview of the pointings of HST and of satellite observations in HST individual images. | Nature Astronomy

Fig. 4: Overview of the pointings of HST and of satellite observations in HST individual images.

From: The impact of satellite trails on Hubble Space Telescope observations

Fig. 4: Overview of the pointings of HST and of satellite observations in HST individual images.

a,b, Normalized frequency distributions of HST pointings (declination δ (a) and right ascension α (b) of the centre of FoV) containing satellite trails (yellow) and of all HST observations (blue). The uncertainty ufreq was calculated using equation (3). c, HEALPix map of the HST pointings, showing the average fraction of HST individual images crossed by satellite trails in each pixel, in Mollweide projection. The sky is split into 48 equal areas (controlled by the resolution parameter Nside = 2, chosen to ensure at least 100 images per pixel).

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