Large-scale environment of LDN 1642 shown by dust emission and optical scattered light. Left panel: Planck 857 GHz surface brightness, the white arrow indicating the direction towards the Galactic Plane. Centre panel: optical scattered light from DSS red channel. The white box shows the location of the LDN 1642 cloud and covers an area of 0.7° × 0.7°. Right panel: a close-up of the area marked with the white box in the centre panel, showing the extended R-band surface brightness. The black stars indicate the locations of the embedded sources B1, B2, and B3, and the red contours show the N(H₂) column density. The lowest contour is at 15 % of the peak column density of 5.14 × 10²¹ cm⁻², with the contour levels increasing in 15 % intervals.