# Sun in hydrogen alpha: Mercury transit 3

Sun in hydrogen alpha: Mercury transit 3. Photograph of the sun by Giancarlo Erra. Prints and merchandise available.

- **Category:** Solar
- **Equipment:** Skywatcher HEQ5 – Skywatcher Esprit 100 F/5.5 Triplet Super APO (550mm) – Daystar Quark Chromosphere HA – ASI174MM-COOL
- **Published:** 2026-08-21

![Sun in hydrogen alpha: Mercury transit 3](https://astro.observer/images/sun-in-hydrogen-alpha-mercury-transit-3/sun-in-hydrogen-alpha-mercury-transit-3-2400.jpg?v=b89cf2b7fb)

Prints and merchandise: https://www.redbubble.com/i/photographic-print/Mercury-Sun-transit-3-by-giancarloerra/21842109/zltf

Copyright Giancarlo Erra, all rights reserved. Licence: https://astro.observer/licence/

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