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Loading content12 Delphini is a hypergiant in the constellation Delphinus (Delphini), lying about 123.78 light-years from Earth.
Class A. White stars with strong hydrogen lines. Many of the brightest stars in the sky are class A. Such stars have surface temperatures around 7,500–10,000 K and appear white to the eye.
| Spectral type | A2Ia+... |
| Luminosity class | Ia+ |
| Apparent magnitude | 5.15 |
| Absolute magnitude | 2.25 |
| Luminosity (Sun = 1) | 10.924 |
| Colour index (B−V) | 0.495 |
| Distance | 123.78 ly (37.95 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
A hypergiant is an exceptionally massive and luminous star, losing mass at a tremendous rate. Hypergiants are extraordinarily rare and short-lived.
Facts on this topic will be cited from these primary and reference sources.
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
High-precision parallax, magnitude, and position for ~118,000 stars.