30 Dor Cluster

NEBULAH II region

ILLUSTRATION FROM H II REGION · MAJOR AXIS 16′

[

OVERVIEW

] NEBULA

30 Dor Cluster is an in the constellation Dorado, shining at apparent magnitude 7.25 (). It is catalogued as C 103, Tarantula Nebula and NGC 2070.

WHAT IT IS: H II region
HOW BIG ON THE SKY: 16.0
HOW BRIGHT (V)
WHERE TO LOOK: Dorado

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OBSERVING

] FROM WHERE YOU ARE

What it takes to see 30 Dor Cluster for yourself. Everything in this part of the page is worked out for a real horizon, a real night and the equipment you say you have.

TONIGHT

Say where you are, and this line says when 30 Dor Cluster is worth going out for.

VIEW IN SKY MAP

[

THROUGH AN EYEPIECE

] 150 MM TELESCOPE · 25 MM EYEPIECE

FIELD 1.08°

Too faint for your eyes alone. Binoculars reach it. 30 Dor Cluster covers 16.0′ of sky against a of 1.08°, so at 48× it is comfortably framed.

: 48×
: 1.08
: 1.25
: 13.0
SIZE ON THE SKY: 16.0
FILLS OF THE FIELD: 25% of the width
APPARENT MAGNITUDE (): 7.25 · within reach

30 Dor Cluster is not a point of light, so the limit above is the wrong one to hold it against: the same brightness spread over 16.0′ of sky is harder than a star of it, and goes first. Catalogued sizes are measured to a photographic contour, and the part an eye sees is usually smaller.

FIND IT ON THE SKY MAP ↗

[

APPARENT PLACE

] EQUINOX J2026.7

Where a telescope has to be pointed today, which is not quite where the catalogue records the object: the coordinate grid itself has turned since the year 2000 the catalogue is referred to.

RIGHT ASCENSION
DECLINATION
GRID TURNED SINCE: 1.4
PROPER MOTION SINCE: none published

Computed for 2026-08-27 00:00 UT. No proper motion is published for 30 Dor Cluster, so nothing here moves the object; what separates this from the catalogued position above is the coordinate grid turning under it — about fifty arcseconds a year of precession since 2000, and the small nodding of the Earth’s axis on top of that. Aberration and refraction are not included, and neither is parallax; each is under an arcminute, which is also about as well as the catalogued position is known. The same figure for any date.

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CATALOG DATA

] 10 FIELDS

The raw catalogue values, as the source published them, with the error bars where one was published — sorted by what each set of figures is about rather than by the order they happened to be stored in.

HOW BRIGHT IT IS

What the light adds up to, measured through one filter at a time. A magnitude is a brightness on a backwards scale — the smaller the number, the brighter the object.

Apparent magnitude ()
Apparent magnitude ()

WHERE IT IS AND HOW IT MOVES

Position, motion across the sky and the size it covers on it. These are measurements of the object as seen from here, so every one of them depends on where here is.

Radial velocity: 251
Redshift (z)
Major axis: 16
Minor axis: 16

OTHER NAMES AND NUMBERS

The identifiers other catalogues file this object under, for anyone joining this data to theirs.

Also known as: Mazurka in B-flat major 'Wołowska'
OpenNGC type code: HII
Wikidata item: Q23306973
Wikipedia article: NGC 2070

[

ALSO KNOWN AS

] 4 DESIGNATIONS

Caldwell C 103
Common name 30 Dor Cluster
Common name Tarantula Nebula
NGC NGC 2070

[

LOOK IT UP ELSEWHERE

] 3 SERVICES

Each link carries the identifier printed beside it. Nothing on this page is a measurement of our own, so a number that disagrees with one of these is worth reporting — and a service that has never catalogued this object under this name will say so plainly.

SIMBADNGC 2070
Cross-identifications, measured values and the reference behind each of them.
ADSobject:"NGC 2070"
Papers indexed against this object rather than against the string, newest first.
VizieR480″ around 84.6765 -69.1009
Every published table with a row at this position, searched by coordinates rather than by name.

[

CITE THIS PAGE

] DR1

This page is live and its numbers move when an upstream refreshes, so the citation names the release the rows belong to rather than the day you read them. The release itself is frozen, republished as a bundle, and is what a data-availability statement should point at.

PLAIN TEXT

SpaceCatalog. 30 Dor Cluster [catalogue entry]. Data release DR1 (2026-08-21). https://spacecatalog.org/object/ngc-2070

BIBTEX

@misc{spacecatalog_ngc-2070,
  author       = {{SpaceCatalog}},
  title        = {{30 Dor Cluster}},
  howpublished = {SpaceCatalog, data release DR1 (2026-08-21)},
  year         = {2026},
  url          = {https://spacecatalog.org/object/ngc-2070},
  note         = {Catalogue entry, data release DR1 (2026-08-21). Values from OpenNGC.}
}

The values above were taken from OpenNGC — CC-BY-SA-4.0. Citing this page does not replace citing that catalogue, and its licence is share-alike: the terms reach whatever you build from these rows.

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