Trumpler 16

16
Trumpler 16 (Tr 16) is a massive open cluster that is home to some of the most luminous stars in the Milky Way galaxy.wikipedia
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Eta Carinae

η Carinaeη CarEta Carinae A
The cluster has one star visible to the naked eye from the tropics southward, Eta Carinae.
It is a member of the Trumpler 16 open cluster within the much larger Carina Nebula.

Open cluster

open star clusterstar clusteropen clusters
Trumpler 16 (Tr 16) is a massive open cluster that is home to some of the most luminous stars in the Milky Way galaxy.

Milky Way

Milky Way Galaxygalaxyour galaxy
Trumpler 16 (Tr 16) is a massive open cluster that is home to some of the most luminous stars in the Milky Way galaxy.

Carina Nebula

Eta Carinae NebulaNGC 3372Keyhole Nebula
It is situated within the Carina Nebula complex in the Carina–Sagittarius Arm, located approximately 2842 pc from Earth.

Tropics

tropicaltropictropical zone
The cluster has one star visible to the naked eye from the tropics southward, Eta Carinae.

Luminosity

luminousbolometric luminosityluminosities
Its most luminous members are Eta Carinae and WR 25, with both having luminosities several million times that of the Sun, and there are three other extreme stars with O3 spectral classes.

Stellar classification

spectral typeK-typeG-type
Its most luminous members are Eta Carinae and WR 25, with both having luminosities several million times that of the Sun, and there are three other extreme stars with O3 spectral classes.

Binary star

spectroscopic binaryeclipsing binarybinary
Both Eta Carinae and WR 25 are binaries, with the primary stars contributing most of the luminosity, but with companions which are themselves more massive and luminous than most stars.

Absolute magnitude

Hbolometric magnitudeabsolute magnitude (H)
Totalling all wavelengths, WR 25 is estimated to be the more luminous of the two, 6,300,000 times the Sun's luminosity (absolute bolometric magnitude -12.25) compared to Eta Carinae at 5,000,000 times the Sun's luminosity (absolute bolometric magnitude -12.0).

Ultraviolet

UVultraviolet lightultraviolet radiation
WR 25 is very hot and emits most of its radiation at ultraviolet wavelengths.

Carina–Sagittarius Arm

Sagittarius ArmSagittariusCarina-Sagittarius arm
It is situated within the Carina Nebula complex in the Carina–Sagittarius Arm, located approximately 2842 pc from Earth.

Dust lane

Dust lanesdustylanes
Another cluster within Carina OB1, Collinder 228, is thought to be an extension of Trumpler 16 appearing visually separated only because of an intervening dust lane.

Pleiades

Pleiades star clusterThe PleiadesPleiades cluster
Because of the extreme luminosity of the stars formed, their stellar winds push away the clouds of dust, similar to the Pleiades.

Supernova

supernovaecore-collapse supernovasupernovas
In a few million years, after the brightest stars have exploded as supernovae, the cluster will slowly die away.

Gaia (spacecraft)

GaiaGaia Data Release 2Gaia spacecraft
Gaia Data Release 2 provides parallaxes for many stars considered to be members of Trumpler 16.

Trumpler 14

HD 93128
Together with the nearby Trumpler 16, they are the main clusters of the Carina OB1 stellar association, which is the largest association in the Carina Nebula, although Trumpler 14 is not as massive or as large as Trumpler 16.

WR 25

It contains a Wolf-Rayet star and a hot luminous companion, and is a member of the Trumpler 16 cluster.

HD 93250

It is only 7.5 arc-minutes from the famous Eta Carinae and HD 93250 is considered to be a member of the same loose open cluster Trumpler 16, although it appears closer to the more compact Trumpler 14.

WR 24

226 G. Car
WR 24 is thought to be a member of the open cluster Collinder 228, sometimes considered to be just an extension of the rich cluster Trumpler 16.

Carina OB1

CarinaCarina OB1-D
It includes the young star clusters Collinder 228, NGC 3293, NGC 3324, IC 2581, Trumpler 14, Trumpler 15 and Trumpler 16, the last being the home of Eta Carinae.

HD 93129

HD 93129AHD 93129 AHD 93129 B
HD 93128, yet another O3.5 main sequence star, is only 24' away within Trumpler 14, and HD 93250 and HD 93205 are two more O3.5 stars in the larger Trumpler 16 cluster around η Carinae.