Messier 28
From DeepSkyPedia
| M 27 << Messier 28 >> M 29 | |
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| Position (epoch J2000) [1] | |
| Constellation | Sagittarius |
| Position | Ra 18:24:32.8 Dec -24:52:12 |
| DSS images | |
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Appearance [1] | |
| Apparent mag. | 6.9 |
| Size | 11' |
| Class | 4 |
| Dreyer's description | ! GC vB L R geCM rrr st 14...16 |
| Other | |
| Other designations | M 28, NGC 6626, ESO 522-SC023 and GCL 94 |
| Notes | |
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Messier 28 is a globular cluster in Sagittarius.
[edit] How to find it
It is 1° NW of 2.8-mag star Lambda Sagittarii (Kaus Borealis).
[edit] Appearance
[edit] Telescopes up to 70mm, binoculars up to 50 mm, and finders
Messier 28 is visible in 10x50 binoculars as a small hazy spot.[2]
Under less dark skies (LM 4.0 to 4.5), M 28 might be hard to spot, looking like out-of-focus star, sometimes even requiring averted vision![3][4][5]
[edit] Telescopes 71mm - 100mm (2.8" - 3.9"), binoculars 51mm - 70mm
Under low sky conditions (LM 4.0 to 4.5), power od 20x (20x70 binos) will show nothing more than small fuzzy ball.[3]
Darker skies (LM=5.8) might, even at lower power (12x60 binos), bring out some details like stellar-like central region[6] that becomes less defined at higher power (31x).[7]
[edit] Telescopes 101mm - 141mm (4" - 5.5"), binoculars 71mm - 100mm
Using telescope in aperture range 102 to 120mm, at low power (28x), this globular looks like round nebulosity, 5' in diameter, with large core that slowly fades towards the edge. No granularity or individual stars can be detected.[8]
At 40x granularity might begun to appear[9].
Individual stars may require from 50x[10] to over 100x[9], depending on sky conditions.
Raising power to 120x or 150x might help. This higher power will make granularity much more obvious, and few extremely faint individual stars might, depending on LM and other parameters, become visible with averted vision[11][12]. Some observers noticed abrupt drop in brightness between core and halo and slightly elongated shape in E-W direction.[12]
More reports:
-
Messier 28 observation and sketch by Rony De Laet with Meade ETX 105 [include this report]
- M 28 with 25x100 binoculars by Ante Perković (SEEN, May 06 2005, no details) [include this report]
[edit] Telescopes 141mm - 177mm (5.6" - 6.9")
- Messier 28 observation by Jeff Burton (x.astrogeek.org) with Orion SkyView Pro 6LT 150mm Reflector [include this report]
[edit] Telescopes 178mm - 234mm (7" - 9.2")
- M 28 with 8" (203mm) f/5 dobson (Orion Skywatcher) by Ante Perković (SEEN, Aug 22 2009) [include this report]
- (IAAC) Obj: M28 (NGC6626) - Inst: 8" f/10 SCT fork mount [include this report]
- Messier 28 observation by Jeff Burton (x.astrogeek.org) with Meade LX200GPS 203mm SCT [include this report]
- Messier 28 observation by Jeff Burton (x.astrogeek.org) with Meade LX200GPS 203mm SCT [include this report]
- Messier 28 observation and sketch by Jere Kahanpää with Newton 205/1000 [include this report]
[edit] Telescopes 235mm - 305mm (9.25" - 12")
- Messier 28 observation by David Erzeel @ deepskylog.be (with Sky-Watcher 10" dobson (250 mm)) [include this report]
[edit] Telescopes 306mm - 381mm (12.1" - 15")
- Sagittarius by Steve Coe - Messier 28 with 13.1" f/5.6 [include this report]
- Messier 28 observation by Tom Polakis with 13" and 20" [include this report]
- Messier 28 observation by Jeff Burton (x.astrogeek.org) with AstroSystems TeleKit 14.5" Reflector [include this report]
- Messier 28 observation by Jeff Burton (x.astrogeek.org) with AstroSystems TeleKit 14.5" Reflector [include this report]
[edit] Telescopes above 15"
[edit] Notes
[edit] References
- ↑ 1.0 1.1 Historic NGC and IC by Wolfgang Steinicke (version Nov. 20, 2006.)
- ↑ (IAAC) M22, M28 , Lew Gramer , Simmons binoculars 7x50 , 1997-07-4/5 , Savoy, MA, USA , LM: 7.2 (zenith) , seeing: 5/10
- ↑ 3.0 3.1 x.astrogeek.org , Jeff Burton , Bushnell GlassesOn 10x50 Binoculars, Orion Little Giant II 20x70mm Binoculars , May 25, 2001 , Paducah, KY, USA , LM: 4.5 – 5 , seeing: Antoniadi: II/III
- ↑ x.astrogeek.org , Jeff Burton , Bushnell GlassesOn 10x50 Binoculars , August 22, 2002 , Paducah, KY, USA , LM: 4.0 , seeing: 6/10
- ↑ (IAAC) A Short Tour of Southern Milky Way Objects (M8, M20, M24, M18, M16, M17, M22, M28, M25, M11) , Erhan Ozturk , binoculars 10x55 , July 6th 1999 , Ankara, Turkey , LM: 4 , seeing: 3/10 (1 best)
- ↑ x.astrogeek.org , Jeff Burton , Bushnell GlassesOn 10x50 Binoculars, Orion Little Giant II 20x70mm Binoculars , July 7, 2007 , Rest Area, Camp Grove, IL, USA , LM: 5.82 , seeing: Antoniadi: II/III
- ↑ x.astrogeek.org , Jeff Burton , Celestron Wide View 80mm Refractor , 31x , October 25, 2003 , Pennyrile State Park, KY, USA , LM: 5.8 , seeing: Antoniadi: II/III
- ↑ M 28 with 120mm f/8.33 refractor, eq. mount (Konus, Lukrica) by Ante Perković (SEEN, Jul 17 2004) [include this report]
- ↑ 9.0 9.1 (IAAC) M 28 , Natko Bajić , KONUS refractor eq. mount , d=120mm , f=1000mm , 40x & 100x , July 9th 2001 , Vinišće, near Split, Croatia (Lat 43.5, Elev 10m) , LM: 5.0
- ↑ (IAAC) M 28 , Bill Becker , Vixen on GP mount , d=102mm , f=918mm , 51x , 6/7/2000 , Casper, Wyoming
- ↑
Messier 28 , Iiro Sairanen , Newton , d=110mm , f=805mm , 127x , 18/19.4.2004 , Base del Teide, Tenerife, Spain , LM: 6.9
- ↑ 12.0 12.1 (IAAC) M 28 , Brent Reary , Newtonian , d=4,5" , f=18" , 150x , 07/31/06 , Rolla, MO, USA , LM: 5.0 , seeing: 5/10
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