def desi_dr8_url(ra, dec):
    """
    Construct URL for public DESI DR8 cutout.

    from SkyPortal
    """
    return (
        f"http://legacysurvey.org/viewer/jpeg-cutout?ra={ra}"
        f"&dec={dec}&size=200&layer=dr8&pixscale=0.262&bands=grz"
    )