Deep Sky Object in Summer
M28 (Globular Cluster in Sagittarius)


Date & Time: May 11 2007, from 25:04 to 25:19 JST(+0900)
Composed 4 shots with 4 minutes exposed
Optical: TAKAHASHI 12.5cm(4.9") fluorite refractor (f=1000mm, F8.0)
Auto-guided with VIXEN ATLUX Equatorial & Meade Pictor 201XT
Digital Camera: Fujifilm FinePix S2 Pro
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto




M28 (NGC6626) / Globular Cluster, type IV
R.A.18h 24m 30.0s (2000.0)
Dec.-24° 52' 00" (2000.0)
Apparent Size4.7'
Real Size75 light yrs.
Magnitude7.3
Distance15,000 light yrs.
M28 is a tiny and dense globular cluster positioned just 1 degree WNW of lambda Sgr. Another striking globular of M22 can also be found about 2.5 north of same star. Both clusters can be recognized as nebula like images only with small binoculars, and you will be able to catch those in your field of view easily. M28 has an apparent size of about 5 arc minutes, less than one third of that of M22. It might be difficult to resolve member stars with small telescopes. The distance is estimated about 15 thousand light years, 1.5 times farther than M22.




M22

M54, M69, M70


Copyright(c) 2007 by Naoyuki Kurita, All rights reserved.
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