# Sun in hydrogen alpha: Mercury transit, first contact

Sun in hydrogen alpha: Mercury transit, first contact. 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, first contact](https://astro.observer/images/sun-in-hydrogen-alpha-mercury-transit-1st-contact-bottom-lef/sun-in-hydrogen-alpha-mercury-transit-1st-contact-bottom-lef-2400.jpg?v=229d2e1b13)

Prints and merchandise: https://www.redbubble.com/i/photographic-print/Mercury-Sun-transit-1st-contact-by-giancarloerra/21842054/zltf

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

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