Space Time
Also known as IC 1805, Sharpless 2-190, Sh2-190, W4.
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.
Heart Nebula image-field center is placed at J2000 RA 2.6 h, Dec 61.6° in Cassiopeia, at an adopted distance of 6,000 light-years.
Heart Nebula (star-forming emission nebula; central source Heart Nebula, embedded stellar population): projected footprint at the adopted distance 62.7 × 63.2 light-years; outer radius used for arrival 31.6 light-years.
This source covers only the central nursery, not the Heart’s entire outline. The adopted distance is approximate; the surrounding complex has differing published estimates. 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.