Space Time
Also known as NGC 7023, Caldwell 4.
One record per aspect. The origin says what kind of thing each value is; the source says where it came from; the limit says what it cannot tell you.
Iris Nebula image-field center is placed at J2000 RA 21.1 h, Dec 68.1° in Cepheus, at an adopted distance of 1,400 light-years.
Iris Nebula (reflection nebula; central source Iris Nebula, illuminating stellar system): projected footprint at the adopted distance 9.8 × 9 light-years; outer radius used for arrival 4.9 light-years.
Broadband optical and hydrogen-alpha composite. The source field includes foreground stars; dust depth is illustrative. Projected structure follows the credited observation at its published angular scale and an approximate adopted distance. Shallow depth is illustrative, not measured tomography. The source palette is preserved; brightness is adjusted for the navigable view.