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We propose a co-ordinated multi-observatory survey at the North EclipticPole. This field is the natural extragalactic deep field location for mostspace observatories (e.g. containing the deepest Planck, WISE and eROSITAdata), is in the continuous viewing zones for e.g. Herschel, HST, JWST, and isa natural high-visibility field for the L2 halo orbit of SPICA with deep andwide-field legacy surveys already planned. The field is also a likely deepsurvey location for the forthcoming Euclid mission. It is already amulti-wavelength legacy field in its own right (e.g. AKARI, LOFAR, SCUBA-2):the outstanding and unparalleled continuous mid-IR photometric coverage in thisfield and nowhere else enables a wide range of galaxy evolution diagnosticsunachievable in any other survey field, by spanning the wavelengths ofredshifted PAH and silicate features and the peak energy output of AGN hotdust. We argue from the science needs of Euclid and JWST, and from thecomparative multiwavelength depths, that the logical approach is (1) a deep(H-UDF) UV/optical tile in the NEP over ~10 square arcminutes, and (2) anoverlapping wide-field UV/optical HST survey tier covering >100 squarearcminutes, with co-ordinated submm SPIRE mapping up to or beyond the submmpoint source confusion limit over a wider area and PACS data over the shallowerHST tier.

A new HST/Herschel deep field at the North Ecliptic Pole: preparing the way for JWST, SPICA and Euclid