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kruno
professor emeritus
Reged: 11/10/05
Posts: 669
Loc: Croatia
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Some day ago i looked M5 on 50X i saw granulation and hint of many stars on the edge (conditions was not so good),
did i suppose to see individual stars with this scope?
However i saw one brighter star on the edge clearly,about 10m8...is such star exist or this was some brighter fragment of granulation ?(sad but i did not draw position-i will do next time)
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Kruno
1x7 eyes
TS1021 102mm f/10 Achro
Olympus 10x50 DPS I
http://free-kr.t-com.hr/raptor/ (croatian only)
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David Knisely
Postmaster
Reged: 04/19/04
Posts: 6777
Loc: Beatrice, Nebraska
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Quote:
Some day ago i looked M5 on 50X i saw granulation and hint of many stars on the edge (conditions was not so good),
did i suppose to see individual stars with this scope?
However i saw one brighter star on the edge clearly,about 10m8...is such star exist or this was some brighter fragment of granulation ?(sad but i did not draw position-i will do next time)
Try kicking the power up to something over 110x and use averted vision. Then, if you are properly dark adapted enough, you should see some of M5's brightest component stars on the edges. Its brightest stars are around magnitude 12.2, so a 102mm aperture should be able to reveal at least some of them. There is one 11th magnitude star on the southeast edge of the cluster, but it may be just a foreground star. Clear skies to you.
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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info
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kruno
professor emeritus
Reged: 11/10/05
Posts: 669
Loc: Croatia
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Thanks on answer.....it must be foreground 11m then....
Clear Sky (skies) to You too !
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Kruno
1x7 eyes
TS1021 102mm f/10 Achro
Olympus 10x50 DPS I
http://free-kr.t-com.hr/raptor/ (croatian only)
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F.Meiresonne
Carpal Tunnel
Reged: 12/22/03
Posts: 2956
Loc: Eeklo,Belgium
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Individul stars can be seen from my backyard only on the best nights. (5 a year?) It is very difficult with my 6 inch but possible. I have rather poor skies 4.5. So probably in Croation with better skies you could see it even a 4 incher refractor...
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Freddy Meiresonne
Obsession 18 inch #1638
Orion Optics 8 inch F/4.5 -1/8 wave optics -Vixen GP-E
20x80 Helios Stellar Binos
10x60 Helios Quantum 4(= Obie Mariner)
10x50 Helios Nature sport plus
8x40 Helios Nature sport plus
Eyepieces in use :Pan 35,24,19, N13T6, Pentax 10 XW, N9T6, Ultrascopic 7.5, TV2, baader ortho 12.5 and 9 mm
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rodelaet
Carpal Tunnel
Reged: 04/28/06
Posts: 2642
Loc: 50°56' N - 4°58' E (Belgium)
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Hi Kruno,
This is my view of M5 with a 105mm Mak.
http://www.cloudynights.com/photopost/showphoto.php?photo=6509&password=&sort=7&thecat=500
Clear skies,
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Rony
My Astronomy Sketches
My Binocular Sketches
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Alvin Huey
Carpal Tunnel
Reged: 10/18/05
Posts: 1533
Loc: NorCal
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Rony,
Nice sketch! What magnification were you using?
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Clear Skies,
Alvin #26
22" f/4.1 reflector, Takahashi TOA-130S on AP1200GTO (just sold), 30" f/4.3 StarMaster and Antares 6" f/6.5 on Orion SVP
FaintFuzzies | TAC | TAC-Sac
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rodelaet
Carpal Tunnel
Reged: 04/28/06
Posts: 2642
Loc: 50°56' N - 4°58' E (Belgium)
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Thank you, Alvin.
For that observation, I used between 100x and 150x.
Clear skies.
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Rony
My Astronomy Sketches
My Binocular Sketches
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Mark K
scholastic sledgehammer
Reged: 12/16/04
Posts: 860
Loc: Bury, Lancashire, UK
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I have seen dozens of individual stars in M5, using 170x power, on better nights from home, with a 5.2 - 5.3 mag sky. This suggests that the brightest stars in the culster are about 11.5 to 12.0 mag.
On a 4.6 mag night, I could only see the 10.8 mag star clearly with direct vision, but some of the brighter ones made tentative appearances in averted.
M5 is definitely a worthy rival to M13, with M92 and M3 not far behind.
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Mark K.
Meade ETX-125
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Achernar
Post Laureate
Reged: 02/25/06
Posts: 3720
Loc: Alabama, USA
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M-5 is a very bright globular, and you were starting to resolve it's individual stars. Try higher magnification next time and if the sky is dark and clear, you'll see some of it's one million stars through your refractor. 100 to 150X will offer you a fine view when the sky conditons are right.
Taras
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10-inch F/4.5 Discovery Dob
6-inch F/8 Homebuilt Dob
4 1/4-inch F/4 Homebuilt reflector
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Jeff Young
Post Laureate
Reged: 08/04/05
Posts: 3164
Loc: Ireland
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Kruno --
Magnification can be your friend with globulars, even if the seeing's not very good.
Last night, I had Pickering 3 with a light wind. (Pickering called this "Poor to Very Poor"; I call it "God Awful". Jupiter was mushy even at 160x.)
Yet on M3, I used 350x to tease out more stars. They weren't sharp, but far more of them were resolved than at 160x.
-- Jeff.
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Nikon 18x70s / UA Millennium Colorado:
Solarscope SF70 / TV Pronto / AP400QMD Coronado SolarMax40 DS / Bogen 055+3130
APM MC1610 / Tak FC-100 / AP1200GTO Tak Mewlon 250 / AP600EGTO
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