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Pismis 24 open cluster

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#1 Daniel Mounsey

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Posted 21 November 2012 - 10:11 PM

Please share your visual observations of this object and what telescope you used.

#2 David Knisely

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Posted 21 November 2012 - 10:41 PM

Please share your visual observations of this object and what telescope you used.


Well, that cluster is just a small angular group of 10 to 15 stars that sits in the more extended nebula NGC 6537 in Scorpius (kind of hard to view this time of year). My log entry from 5/4/2000 reads:

NGC 6357, 5/4/2000, at 0730 UTC: 10 inch f/5.6 Newtonian, 70x.
Larger faint roughly oval haze north of a N-S line of stars. Very patchy. UHC and OIII show brighter patch around a tiny tight group of stars. Outer edges very irregular. Cluster Pismis 24 near center, with 7-10 stars.


From my filter survey:

NGC 6357 (diffuse nebula in Scorpius)
(10 inch f/5.6, 52x).
DEEP-SKY: (2) not easy to see without a filter, as Deep-Sky just barely brings it out.
UHC: (3) Noticeable boost in contrast, showing some irregularity and a brighter portion around a tiny group of stars.
OIII: (4) More contrast than UHC, with the patch around the tiny star group greatly enhanced.
H-BETA: (1) almost kills the nebulosity.
RECOMMENDATION FOR NGC 6537: OIII/UHC (H-Beta *not* recommended).

Clear skies to you.

#3 blb

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Posted 22 November 2012 - 09:34 AM

From a dark site this is just a small knot of four or five stars in my 4-inch TV102 refractor. This is only a small group of about ten stars in a rich field with the four brighter members in a curve. It is shown here on this DSS image of NGC 6357 a little below and left of center in this 15'x15' image.

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#4 Daniel Mounsey

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Posted 05 December 2012 - 11:24 PM

Thanks for the info guys. :)

#5 LivingNDixie

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Posted 06 December 2012 - 04:28 PM

What do you see Daniel?

#6 timokarhula

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Posted 06 December 2012 - 05:04 PM

I observed the open star cluster Pismis 24 in Scorpius with my 18x50 Canon IS binoculars from Geraldton on May 14, 2004. I saw the main double star with the magnitudes 10.43 and 10.66 (HJ4946) plus an additional N-S glow from stars fainter than mag 11.3, diameter about 1'.5. One should note that the original coordinates of the cluster were 15' wrong in Uranometria 1st edition, Sky Catalogue 2000.0 and Night Sky Observer's Guide and the correct position (equinox 2000.0) is 17h24m43s, -34ยบ12'23". Pismis 24 has the correct position in the van den Bergh-Hagen catalog as the entry number 227.

/Timo Karhula

#7 Daniel Mounsey

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Posted 07 December 2012 - 12:46 AM

What do you see Daniel?


Hi Preston,

Somehow I didn't document Pismis 24, so I was curious about some of the others description of it. I like obscure and peculiar objects. With that said, Buddy and several others gave me some ideas.

#8 EJN

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Posted 07 December 2012 - 07:36 PM

Pismis sounds like an unfortunate incident in the bathroom...

#9 Daniel Mounsey

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Posted 08 December 2012 - 10:41 AM

Pismis sounds like an unfortunate incident in the bathroom...


:funny:






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