The Heart Nebula, also known as IC 1805, emits light across a range of wavelengths, including visible and infrared light. Specifically, the emission from the Heart Nebula is prominent in the H-alpha spectral line, which is a specific wavelength of red light.
The H-alpha line corresponds to the emission of light at a wavelength of approximately 656.28 nanometers (nm). This spectral line is associated with hydrogen gas that is excited and ionized within the nebula, and it is commonly used in astrophotography to capture the distinct red glow of emission nebulae like the Heart Nebula.
It's important to note that the Heart Nebula emits light at other wavelengths as well, but the H-alpha line is particularly prominent and visually striking. Observing the nebula in this specific wavelength allows astronomers and astrophotographers to capture its characteristic features and showcase the emission from ionized hydrogen within the region.