Deep Sky Object in Winter
NGC1788 & its vicinity (Reflection Nebula in Orion)
Click on image to enlarge
| Date & Time: | Nov 22 2025, from 23:52 to 25:04 JST(+0900) |
| Composed 10 shots with 8 minutes exposed |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with IDAS LPS-D1 light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial+SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -20°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording format...16bit FITS, converted to 16bit TIFF(6248×4176) |
| Device Size...23.5×15.7mm, Gain...100 |
Objects around NGC1788 |
The reflection nebula about 5 arcminutes across at the top of the frame is NGC1788, located in the western part of Orion near the boundary with Eridanus.
It lies roughly 2 degrees north of β Eridani. NGC1788 shines by reflecting the light from foreground stars situated in front of the large dark nebula complex that spreads throughout this region.
At the center of the nebula is a rather intricate structure where the dark nebula LDN 1616 is interwoven.
Extending westward from this point is the molecular cloud LDN 1615, which also has a dark]nebula designation, and farther to the south, more molecular clouds of complex shape spread out.
About 0.5 degrees south of NGC1788, a clump of molecular clouds extends eastward; this area is designated LBN 923.
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| NGC1788 / Reflection Nebula, type 1 R |
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| R.A. | 05h 06m 55.0s (2000.0) |
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| Dec. | -03° 20' 15" (2000.0) |
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| Apparent Size | 5.5×3.0' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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| Other IDs | LBN 916 |
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|
| LDN 1615 / Dark Nebula |
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| R.A. | 05h 05m 30.0s (2000.0) |
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| Dec. | -03°26' 00" (2000.0) |
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| Apparent Size | 17.0×17.0' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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|
| LBN 923 / Molecular Cloud, type 5 R |
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| R.A. | 05h 06m 20.0s (2000.0) |
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| Dec. | -03°56' 00" (2000.0) |
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| Apparent Size | 120×60' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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|
Click on image to enlarge
Close-up of NGC1788
| Date & Time: | Dec 10 2020, from 20:41 to 21:48 JST(+0900) |
| Composed 12 shots with 6 minutes exposed |
| Optical: | Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3) |
| with BaaderPlanetarium Moon&Skyglow filter |
| Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN |
| Digital Camera: | Nikon D810A |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080) |
| Device Size...20×20mm |
| Sensitivity...ISO4000, White Balance...Daylight |
| NGC1788 / Reflection Nebula, type 1 R |
|---|
| R.A. | 05h 06m 55.0s (2000.0) |
|---|
| Dec. | -03° 20' 15" (2000.0) |
|---|
| Apparent Size | 5.5×3.0' |
|---|
| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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| Other IDs | LBN 916 |
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|
| LDN 1616 / Dark Nebula |
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| R.A. | 05h 07m 00.0s (2000.0) |
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| Dec. | -03°21' 06" (2000.0) |
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| Apparent Size | 5.0' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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This is a close-up image of NGC1788. You can clearly see the complex structure where the dark nebula LDN 1616 is intertwined with it.
The reflection nebula is illuminated by a 10th-magnitude star located in the northwest part of the nebula.
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