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NGC7023 / The Iris Nebula
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| Classification: |
Reflection nebula NGC7023, Caldwell 4 |
| Constellation: |
Cepheus (Cep) |
| Object Location: |
Ra 21h 01m 49s Dec +68° 14’04° (current) |
| Size & Distance: |
18 x 18 Apx 1,300 light-years. |
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| Date & Location: |
08-02-2008 Palomar Mountain, CA |
| Exposure: |
LRGB, L= 20 @ 3min, RGB=15ea. @ 4min. All (bin 1x1) |
| Optics: |
Takahashi Epsilon-180 f2.8 504mm. |
| Mount: |
Astro-Physics 900 GTO / ATS 10x36 pier |
| Camera: |
SBIG-ST10XME @-10c |
| Filters: |
Astrodon G1 RGB |
| Software: |
MaxImDL 4.56, Photoshop CS |
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| Notes: |
Sky conditions: Good seeing, Calm wind, Temp 66°
Image Field of view is 68 x 101 arcmin.
This image was an Astronomy Magazine Picture Of The Day, Sept 2009
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The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by a magnitude +7 star, SAO 19158. It shines at magnitude +6.8. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alphirk). It lies 1,300 light-years away and is six light-years across.
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