Trumpler 20 Clusters of the Southern Cross (Wes Smith)

Celestial hemisphere: Southern · Constellation: Crux (Cru)

Trumpler 20 Clusters of the Southern Cross, Wes Smith

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Trumpler 20 Clusters of the Southern Cross

Acquisition type: Lucky imaging

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Trumpler 20 Clusters of the Southern Cross

Acquisition type: Lucky imaging

A somewhat rare clear night it seems of late . Here is a lesser imaged Open Cluster in the Deep South nestled in a dense star field.Many wide field photos of the Southern Cross will have this gem within them however at the image scale I believe this is n Astrobin debut.
Extract published
Monthly Notices of the Royal Astronomical Society, Volume 391, Issue 3, December 2008, Pages 1482–1488,
We show that the open cluster Trumpler 20, contrary to the earlier findings, is actually an old Galactic open cluster. New CCD photometry and high-resolution spectroscopy are used to derive the main parameters of this cluster. At [Fe/H]=−0.11 for a single red giant star, the metallicity is slightly subsolar. The best fit to the colour–magnitude diagrams is achieved using a 1.3-Gyr isochrone with convective overshoot. The cluster appears to have a significant reddening at E(B−V) = 0.46 (for B0 spectral type), although for red giants this high reddening yields the colour temperature exceeding the spectroscopic Teff by about 200 K. Trumpler 20 is a very rich open cluster, containing at least 700 members brighter than MV=+4. It may extend over the field of view available in our study at 20 × 20 arcmin2.

Rarely Imaged Small DSOs
Astrophotography with Dobson
Short exposures DSO

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Trumpler 20 Clusters of the Southern Cross

Trumpler 20 Clusters of the Southern Cross

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