Emission Nebula · Dorado

C103 Tarantula Nebula

Magnitude
8
Season
Winter
Difficulty
Easy
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Imaging reference
Tarantula Nebula (C103) Emission Nebula

Observer's guide

About Tarantula Nebula

Tarantula Nebula (C103) is catalogued as an emission nebula in Dorado. Its J2000 position is RA 05:38:42, Dec -69:06:03, corresponding to 84.675 degrees RA and -69.1 degrees Dec. The local catalogue places it about 170,000 light-years away. Its referenced angular extent is approximately 3.5 by 3.5 arcminutes.

Observing tips

StarWatchr rates this as an easy target at magnitude 8. It is associated with winter observing, with midnight placement typically strongest around December. From 52 degrees north its theoretical meridian altitude is about 0 degrees; local horizons and the live altitude chart determine the practical window.

A small telescope under reasonably dark skies is a good starting point; use the live altitude chart to choose its highest point.

What to expect

The SIMBAD classification for the matched source is Cl*. A published radial velocity value is 251 km/s. The SIMBAD record currently connects it to 408 bibliographic references.

At roughly 3.5 arcminutes across, it benefits from a narrower field and adequate image scale. Use the listed 3.5 by 3.5 arcminute extent to check framing, and treat catalogue magnitude as integrated brightness rather than a direct measure of visual contrast.

Sourced catalogue data

Scientific record

Measurements for C103 are kept separate from practical observing guidance.

Coordinates (J2000/ICRS)
RA 84.6750° · Dec -69.1000°
SIMBAD classification
Cl*
Angular extent
3.5′ × 3.5′
Surface brightness
19.35 mag/arcsec²
Radial velocity
251 km/s
Redshift
0.0008376
Linked bibliography
408 references
Best midnight placement
December
Observable latitude range
-90° to 20.9°

Source: SIMBAD astronomical database (CDS, Strasbourg) (ODbL; checked 2026-08-09). Catalogue values may change when new measurements are published.

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