RA 1h 34m · Dec +30° 41′

5′

The third-largest member of the Local Group and the most distant object regularly visible to the naked eye under exceptional conditions. Low surface brightness makes it challenging; long exposures reveal the HII regions NGC 604 — one of the largest emission nebulae known — dotted through the spiral arms.

Galaxy

Triangulum Galaxy

M 33 · Triangulum

These photons are ~2.73 million years old

UV/IRUV/IR-cut. Blocks ultraviolet and infrared so refractor optics stay in focus across the visible band.

ZWO Seestar S50ZWO Seestar S50Aperture 50mm · Focal length 250mm · f/5 · Apo triplet with ED element · Sony IMX462 colour CMOS sensor (1920 x 1080, 2.1MP)…View equipment →LPBroadband light-pollution filter. Suppresses the sodium and mercury glow of streetlights while passing the main nebula emission lines and natural star colours.

ZWO Seestar S50ZWO Seestar S50Aperture 50mm · Focal length 250mm · f/5 · Apo triplet with ED element · Sony IMX462 colour CMOS sensor (1920 x 1080, 2.1MP)…View equipment →

⧉ 17 versions of this capture — pick one to see its image and log

↻ Revisited — built over 3 nights, eight nights later

1 17/09/2025 0m (1 × 20s) + 0m (1 x 20s) + 45m (130 x 10s + 1 x 20s + 68 x 20s) ZWO Seestar S50, ZWO Seestar S50 Camera
2 18/09/2025 23m (68 x 20s) ZWO Seestar S50, ZWO Seestar S50 Camera
3 25/09/2025 22m (130 x 10s) ZWO Seestar S50, ZWO Seestar S50 Camera

17/09/2025 25/09/2025 Eight nights later

Date: 17/09/2025
Location: 36.3859° N, 28.0411° E
Integration: 0m (1 × 20s)
Software: ZWO Seestar app
Notes: ·
Total effort: 6h over 3 nights
Moon: 🌘Waning crescent, 26% lit
Plate solve
Centre RA: 1h 33m 33.2s
Centre Dec: +30° 41′ 05″
Field: 42.7′ × 76.0′
Pixel scale: 2.37″/px
Orientation: 108.2° E of N
Hemisphere: Northern

Also in this frame

NGC 595M33NGC 592IC 131IC 142IC 139IC 143IC 137IC 135NGC 588IC 136IC 133IC 134NGC 604IC 132NGC 603

Catalogued objects inside the plate-solved field, nearest the centre first. Highlighted names have their own photo here.

TelescopeZWO Seestar S50

CameraZWO Seestar S50 Camera

RigFamily Holiday Rig

Where to find it

Finder chart

Star field and catalogued objects inside the plate-solved field, oriented to the solve. Fully offline, from the bundled star and deep-sky catalogues.

Interactive sky chart centred on 1 33 33.2 +30 41 05. Drag to pan, scroll to zoom, click a star or object to identify it. Zoom in to the plate-solved field for the DSS survey photo; zoom out for constellation figures and neighbouring catalogue objects. Fully self-hosted: the star and deep-sky catalogues and the survey image are all served from this site, so nothing external loads. Imagery: DSS2 colour (STScI / POSS-II). Constellation figures © Dominic Ford (GPLv3).

Captured from · Ρόδος (Rhodes)

36.3859° N, 28.0411° E · view on OpenStreetMap ↗ · Place data © GeoNames (CC BY)

Frequently asked questions

What kind of object is M 33?

M 33 is a galaxy.

Which constellation is M 33 in?

M 33 lies in the constellation Triangulum.

How far away is M 33?

The light in this image left M 33 roughly ~2.73 million years ago, so that is how far back in time you are seeing it.

What are the coordinates of M 33?

M 33 sits at right ascension 01h 33m 33s and declination +30° 41′ 05″ (J2000).

When is the best time to photograph M 33?

M 33 rides highest in the evening sky around October, reaching about 84° above the horizon from around 36°N.

What else is in this frame?

The plate-solved field also contains NGC 595, NGC 592, IC 131, IC 142, IC 139, IC 143, IC 137, and IC 135, among others.

What equipment was used to photograph M 33?

This image of M 33 was captured with ZWO Seestar S50 and ZWO Seestar S50 Camera.

How much exposure time went into this image?

This image of M 33 represents 0m (1 × 20s) + 22m (130 x 10s) + 0m (1 x 20s) + 23m (68 x 20s) + 45m (130 x 10s + 1 x 20s + 68 x 20s) of total integration time.

Triangulum Galaxy

Where to find it

Frequently asked questions

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