Tag Archives: NGC 7023

The Iris Nebula, (NGC 7023, Caldwell 4)

5.1.15

The Iris Nebula, also NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus, (The Caldwell Catalogue is an astronomical catalog of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier Catalogue). NGC 7023 is actually the cluster within the nebula, LBN 487, and the nebula is lit by amagnitude +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.

This is a crowd image, made by combining 156 Creative Commons images. Integration time is based on an average of 50 random samples.

Author: Morten Balling

NGC 7023

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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.

Imaging telescopes or lenses: TPO 8″ Ritchey–Chrétien
Imaging cameras: SBIG ST-8300M
Mounts: Orion Atlas EQ-G
Guiding cameras: SBIG ST-i Planetary and Guide Camera Mono
Focal reducers: CCDT67
Filters: Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil
Accessories: SBIG OAG-8300
Dates: Aug. 26, 2014
Frames:
Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil: 12×600″ -10C bin 1×1
Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil: 18×600″ -10C bin 2×2
Integration: 5.0 hours

Author: Mike Carroll
AstroPhotography of the day by SPONLI 05 Sep 2014 

NGC 7023: The Iris Nebula 

NGC7023Walker
Image Credit & Copyright: Jimmy Walker

 These clouds of interstellar dust and gas have blossomed 1,300 light-years away in the fertile star fields of the constellation Cepheus. Sometimes called the Iris Nebula, NGC 7023 is not the only nebula in the sky to evoke the imagery of flowers, though. Still, this deep telescopic view shows off the Iris Nebula’s range of colors and symmetries in impressive detail. Within the Iris, dusty nebular material surrounds a hot, young star. The dominant color of the brighter reflection nebula is blue, characteristic of dust grains reflecting starlight. Central filaments of the dusty clouds glow with a faint reddish photoluminesence as some dust grains effectively convert the star’s invisible ultraviolet radiation to visible red light. Infrared observations indicate that this nebula may contain complex carbon molecules known as PAHs. The pretty blue petals of the Iris Nebula span about six light-years.

APOD NASA 02-Aug-2014

NGC 7023 Iris Nebula

bb5d0523683b1db08fe977ef5c71d702.1824x0_q100_watermark
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.

Imaging telescopes or lenses: Ian King Ikharos 8″ RC
Imaging cameras: Atik 460 EX
Mounts: Software Bisque Paramount MX
Guiding telescopes or lenses: Ian King Ikharos 8″ RC
Guiding cameras: Atik 314L+
Software: PixInsight, Software Bisque CCDSoft 5, Software Bisque TheSkyX, iLanga AstroPlanner, Matt Thomas’s CCDCommander
Filters: Baader Luminance 36mm, Baader Red, Green, Blue 36mm
Accessories: Atik EFW2, Innovations Foresight On-axis guider
Dates: June 28, 2014
Frames: 93×600″
Integration: 15.5 hours

Author: Colin McGill

AstroPhotography of the day by SPONLI 01 July 2014

The Iris Nebula in a Field of Dust 

irisdust_martinez_3310
Image Credit & Copyright: Mikel Martínez

 What flowers in this field of dark star dust? The Iris Nebula. The striking blue color of the Iris Nebula is created by light from the bright star SAO 19158 reflecting off of a dense patch of normally dark dust. Not only is the star itself mostly blue, but blue light from the star is preferentially reflected by the dust — the same affect that makes Earth’s sky blue. The brown tint of the pervasive dust comes partly fromphotoluminescence — dust converting ultraviolet radiation to red light. Cataloged as NGC 7023, the Iris Nebula is studied frequently because of the unusual prevalence there of Polycyclic Aromatic Hydrocarbons (PAHs), complex molecules that are also released on Earth during the incomplete combustion of wood fires. The bright blue portion of the Iris Nebula spans about six light years. The Iris Nebula, pictured above, lies about 1300 light years distant and can be found with a small telescope toward the constellation of Cepheus.

APOD NASA 24-Jun-14

The Iris Nebula

a62b3fc731e5a96eb1ca8d72f6e42e67.1824x0_q100_watermark_watermark_opacity-10_watermark_position-6_watermark_text-Samuli VuorinenThe 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 theMira-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.

Imaging telescopes or lenses: Boren-Simon PowerNewt 8
Imaging cameras: Atik 460EX
Mounts: Sky-Watcher EQ-6 Pro
Guiding telescopes or lenses: Teleskop-Service Finderscope
Guiding cameras: QHYCCD QHY5
Focal reducers: ASA 2″ x 0,73 Corrector/Reducer 2KORRR
Software: PixInsight, Maxim DL, AstroTortilla
Filters: Astronomik G, Astronomik B, Astronomik R, Astronomik L
Accessories: Lunatico Astronomia Seletek Armadillo
Dates: Sept. 6, 2013
Frames:
Astronomik B: 6×600″ -10C bin 1×1
Astronomik G: 6×600″ -10C bin 1×1
Astronomik L: 8×600″ -10C bin 1×1
Astronomik R: 6×600″ -10C bin 1×1
Integration: 4.3 hours
Flats: ~20
Bias: ~500

Author: Samuli Vuorinen

AstroPhotography of the day by SPONLI
3 Abril 2014