Pleiades M45 Seven Sisters NGC1432 (John Bradshaw)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: 19 Tau) · 25 Tau) · Barnard's Merope Nebula · IC 349 · Maia Nebula · Merope Nebula · NGC 1432 · NGC 1435 · Sterope I (21 Tau) · The star Alcyone (η Tau · The star Asterope · The star Celaeno (16 Tau) · The star Electra (17 Tau) · The star Merope (23 Tau) · The star Sterope II (22 Tau) · The star Taygeta (q Tau

Pleiades M45 Seven Sisters NGC1432, John Bradshaw

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Pleiades M45 Seven Sisters NGC1432

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Pleiades M45 Seven Sisters NGC1432

Pleiades M45 Seven Sisters NGC1432
20x60s120x-5dBin2 each for RGB 28x120s0x-5dBin2 Lum (1 hour 56 min total)
Quattro 200mm /SW coma corrector/ ZWOASI294MMPro/EFW ZWO LRGB 1.25" / OAG 27/12/2022

Looking for an easy target between clouds! Does't get any easier than this!

Big and visible to the naked eye and known since posterity, the open cluster is said to have over 1000 members including the usual distribution, so, as this shows, not just blue stars.

14 potentially naked-eye-visible stars they tell me, 1 fuzz to me! Even at my best 6 stars, like the original Japanese name "Mutsuraboshi" ("six stars") suggests. (Even my Subaru only had 6).

There seems to be an argument between Hipparcos (120+/-0.2parsecs) and everyone else (134-136parsecs) over its distance with Hipparcos team not giving in as at 2009. This mattered in the past as it was important as a cosmic ruler for using the distribution of star types (Hertzsprung-Russel diagram) which was then assumed normal and used to compare with more distant clusters to get their distance. (Once they got other clusters analysed eg the Hyades the uncertainty over the distance didn't matter any more.)

75-150 Million years old, another 250 Million to disperse they predict.

All the stars are B or lower. There are no O stars: the blue is reflection from dust.The texture in the nebulosity is thought to have some contribution from light pressure and bow shock from the cluster moving (relatively slowly) through the locally thicker insterstellar medium/dust cloud. This isn't the cloud the cluster was formed in.

Pretty in binoculars. Makes for a beautiful photo!

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Astrometry.net job	7068708
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Pleiades M45 Seven Sisters NGC1432

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