Caldwell 103 — Emission Nebula in Dorado
NGC 2070
About Tarantula Nebula
Description
The Tarantula Nebula (NGC 2070) is the largest and most luminous HII region in the Local Group, located in the Large Magellanic Cloud about 160,000 light-years away in Dorado. Spanning 40 arcminutes (200 light-years), it would cover 30 degrees of sky if placed at the Orion Nebula's distance.
Observing Tips
Visible to the naked eye as a bright knot in the LMC. Binoculars reveal its extent and the central star cluster R136. A telescope shows intricate loops, arcs, and filaments of nebulosity. An OIII filter enhances the detail. Best from southern latitudes year-round when the LMC is visible.
History
First noted by Nicolas Louis de Lacaille in 1751. The massive star cluster R136 at its heart was initially thought to be a single supermassive star of 1,000+ solar masses until resolved into individual stars. Supernova 1987A exploded on the nebula's outskirts.
Fun Facts
R136a1, the most massive star in the central cluster, has about 196 solar masses and is over 6 million times as luminous as the Sun. If the Tarantula Nebula were at the distance of the Orion Nebula, it would be bright enough to cast shadows on Earth.
Observe
1Properties
Position & Identifiers
2How easy to spot?
| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Medium+ | Medium+ | Medium+ |
| 150 mm Newton 150mm Newt. | Medium+ | Medium+ | Medium+ |
| Celestron C8 (203 mm SCT) C8 203mm | Medium+ | Medium+ | Medium+ |
Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs
With O-III filter
| Telescope | Bortle 3 | Bortle 4 | Bortle 5 |
|---|---|---|---|
| 80 mm refractor 80mm refr. | Easy | Easy | Easy |
| 150 mm Newton 150mm Newt. | Easy | Easy | Easy |
| Celestron C8 (203 mm SCT) C8 203mm | Easy | Easy | Easy |
3Visibility
Set a location in User Settings to see visibility data.
4
Filter Response Guide
5
Eyepiece View
Tarantula Nebula · 16.0′×16.0′ · N up, E left
Explore
6
Surface Brightness
Discover
7
Light Travel Time Machine
8
Relativistic Travel
Community Photos (1)
Credit: NASA, ESA, CSA, STScI, Webb ERO Production Team. License: Public domain. (Wikimedia Commons)
Skybred Mar 2, 2026
Nearby in the Sky
Other targets within a few degrees — pan your scope a little and keep exploring.
Visibility scores assume a 150 mm Newton at Bortle 4.
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