| Designation |
IC 5146
The Cocoon Nebula (Sh2-125) & Bernard 168
|
| Type | Emission & Reflection Nebula with Open Star Cluster and Dark Nebula (B-168) |
| Constellation | Cygnus |
| Coordinates | Telescope centered at RA '21 53 21' Dec '+47 16 20' |
| Magnitude | 7.2 |
| Size | |
| Distance | 3000 light years |
| Dimensions | 10 x 10 arcminutes (B 168 - 10 x 100 arcminutes) |
| Image Field | 90.6 x 131.3 arcminutes |
|
Notes:
|
The newly developed open star cluster is surrounded by nebulosity comprised primarily of hdrogen gas. It is located at the end of the long sark nebula (dust cloud) lableled B 168, which obscures the rich Milky Way star field behind it. |
| The central star of the nebula may be the original source of the gas cloud and primary emitter of radiation that flouresces it. | |
|
|
| Telescope | Takahashi FS60C f/5.9 on Losmandy G-11 with Gemini L3 |
| Focal Length | 264 mm @ f/4.4 with Takahashi focal reducer |
| Guiding | Starlight Xpress SXV guidehead through 10" SCT @ f/3.3 |
| Telescope Control | Maxim DL (V3) |
| CCD Camera |
Starlight Xpress SXV-H9 - USB 2 ExView progressive
scan
1392 x 1040 (6.45 uM) pixel array (8.98 x 6.71 active area)
|
| Image Scale | 5.23 arcsec/pixel |
| Filters |
1.25" Astronomik Type II Dichroic
IR blocking filters in Astronomik filter drawer - Clear, Red, Green,
Blue, Ha
|
| Exposures |
Total exposure time: 185 minutes -Lum: 13 x
5 (65) Ha: 12 x 5 (60) minutes unbinned, red &
green each 6 x 3 minutes binned 2x, blue 8 x 3 (24) binned 2x. Sigma
combined.
|
| Calibration | None |
| Processing Software | Maxim DL, Photoshop CS (8.0) |
| Location | Chiefland Astronomy Village, FL - 29.393 N , - 82.863 W |
| Date/Time | 09/18/04 / '01:02' - '04:38' UT' |
