# Triangulum Galaxy / M33

#### **Messier 33**

[![IMG_0095.png](https://astro.afonsomuralha.com/uploads/images/gallery/2025-08/scaled-1680-/img-0095.png)](https://astro.afonsomuralha.com/uploads/images/gallery/2025-08/scaled-1680-/img-0095.png)

> **My best photo of the Triangulum galaxy -** [Full resolution picture available on Telescopius](https://telescopius.com/pictures/view/201674/deep_sky/triangulum-galaxy/m-33/by-afonso_muralha?gallery_order=is_featured&gallery_page=1&gallery_user_id=39078#annotated=off)  
> **Details**:  
> <span style="white-space: pre-wrap;"> - </span>**Date**: 31/Aug/2024  
> <span style="white-space: pre-wrap;"> - </span>**Exposures**: 63x1min Lights, 10x60min Darks  
> <span style="white-space: pre-wrap;"> - </span>**ISO**: 800  
> **Equipment**:  
> <span style="white-space: pre-wrap;"> - </span>**Camera**: Canon 6D  
> <span style="white-space: pre-wrap;"> - </span>**Telescope**: Svbony Apochromatic 80/448 mm SV503 80ED Doublet (0.8x reducer/flattener)  
> <span style="white-space: pre-wrap;"> - </span>**Mount**<span style="white-space: pre-wrap;">: EQ5 modified with Onstep </span>

### **Description**

The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598. With the D25 isophotal diameter of 18.74 kiloparsecs (61,100 light-years), the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way.

<p class="callout info">[Find more information about the Triangulum Galaxy on Wikipedia](https://en.wikipedia.org/wiki/Triangulum_Galaxy)</p>

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### **Personal Stats**

#### **First observation**

<table class="align-center" id="bkmrk-%F0%9F%93%86-12%2F01%2F2013-%F0%9F%93%8D-los-a" style="border-collapse: collapse; width: 50%; border-width: 1px; height: 58px;"><colgroup><col style="width: 21.2346%;"></col><col style="width: 78.5185%;"></col></colgroup><tbody><tr style="height: 29px;"><td class="align-center" style="border-width: 1px; height: 29px;">📆

</td><td class="align-center" style="border-width: 1px; height: 29px;">31/8/2024

</td></tr><tr style="height: 29px;"><td style="border-width: 1px; height: 29px; vertical-align: middle;">📍

</td><td class="align-center" style="border-width: 1px; height: 29px;">Canadelo, Portugal

</td></tr></tbody></table>

#### **Imaging sessions**

<table class="align-center" id="bkmrk-%C2%A0datebortle-classtot" style="border-collapse: collapse; width: 80%; height: 87.5px; border-width: 1px;"><colgroup><col style="width: 86px;"></col><col style="width: 244px;"></col><col style="width: 298px;"></col></colgroup><tbody><tr style="height: 29.5px;"><td class="align-center" style="background-color: rgb(255, 255, 255); border-style: none; height: 29.5px; border-width: 1px;"><span style="white-space: pre-wrap;"> Date</span>

</td><td class="align-center" style="height: 29.5px; border-width: 1px;">Bortle Class

</td><td class="align-center" style="height: 29.5px; border-width: 1px;">Total Exposure Time

</td></tr><tr style="height: 29px;"><td class="align-center" style="vertical-align: middle; height: 29px; border-width: 1px;">31/8/2024

</td><td class="align-center" style="vertical-align: middle; height: 29px; border-width: 1px;"><span style="white-space: pre-wrap;"> Class 3</span>

</td><td class="align-center" style="vertical-align: middle; height: 29px; border-width: 1px;"><span style="white-space: pre-wrap;"> 1h03min (63x1min)</span>

</td></tr></tbody></table>

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**Captured media**

#### **Photographs**

[![IMG_0095.png](https://astro.afonsomuralha.com/uploads/images/gallery/2025-08/scaled-1680-/img-0095.png)](https://astro.afonsomuralha.com/uploads/images/gallery/2025-08/scaled-1680-/img-0095.png)

> **My best photo of the Triangulum galaxy -** [Full resolution picture available on Telescopius](https://telescopius.com/pictures/view/201674/deep_sky/triangulum-galaxy/m-33/by-afonso_muralha?gallery_order=is_featured&gallery_page=1&gallery_user_id=39078#annotated=off)  
> **Details**:  
> <span style="white-space: pre-wrap;"> - </span>**Date**: 31/Aug/2024  
> <span style="white-space: pre-wrap;"> - </span>**Exposures**: 63x1min Lights, 10x60min Darks  
> <span style="white-space: pre-wrap;"> - </span>**ISO**: 800  
> **Equipment**:  
> <span style="white-space: pre-wrap;"> - </span>**Camera**: Canon 6D  
> <span style="white-space: pre-wrap;"> - </span>**Telescope**: Svbony Apochromatic 80/448 mm SV503 80ED Doublet (0.8x reducer/flattener)  
> <span style="white-space: pre-wrap;"> - </span>**Mount**<span style="white-space: pre-wrap;">: EQ5 modified with Onstep </span>