Deep Sky Object in Summer
Around IC4628, H12 (Diffused Nebula & Open Cluster in Scorpius)
Click on image to enlarge
| Date & Time: | May 4 2016, from 26:09 to 26:39 JST(+0900) |
| Mosaic of 2 flames of 4min.×4shots |
| Optical: | BORG 60ED with a conversion lens (f=245mm, F4.1) |
| with IDAS LPS-P1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI EM-200 Equatorial |
| Digital Camera: | Canon EOS 6D (Remodeled) |
| Location: | Furudono town, Fukushima pref. |
| Camera Settings: | Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648) |
| Device Size...35×24mm, Sensitivity...ISO1600 |
Objects around IC4628, H12
Italics denote the open clusters |
Around between mu and zeta Scorpii, there are various tiny clusters and diffused nebulae lying scattered.
They're positioned near the Milky Way of the Galaxy's central region.
A redish diffused nebula in central part is catalogued as IC4628, actually it's vast one being pushed out of the field of the photo.
And a very scattered large cluster occupies in just lower part of IC4628 is called H (Herschel's Catalogue) 12,
mainly consists of stars with magnitude 6th or 7th.
Finally you'll be able to identify a bright open cluster of NGC6231 in lower part of the picture.
This cluster is certainly worthy of being a Messier, while noticeable to the naked eye. Portable binoculars resolve its members.
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| IC4628 / Diffused Nebula, type E |
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| R.A. | 16h 57m 08.0s (2000.0) |
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| Dec. | -40° 18' 00" (2000.0) |
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| Apparent Size | 52.0×33.0' |
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| Real Size | - |
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| Magnitude | - |
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| Distance | N/A |
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| Other IDs | Gum 56, RCW 116 |
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|
| H12 (Cr316) / Open Cluster, type c, I 2 m |
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| R.A. | 16h 56m 6.0s (2000.0) |
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| Dec. | -40° 43' 00" (2000.0) |
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| Apparent Size | 40' |
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| Real Size | 14 light yrs. |
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| # of Stars | - |
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| Magnitude | 8.5 |
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| Distance | 1230 light yrs. |
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|
| NGC6231 / Open Cluster, type f, I 3 p |
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| R.A. | 16h 54m 0.0s (2000.0) |
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| Dec. | -41°48' 00" (2000.0) |
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| Apparent Size | 15.0' |
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| Real Size | N/A |
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| # of Stars | 93 |
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| Magnitude | 2.6 |
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| Distance | N/A |
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