Iris Nebula

Iris Nebula
Reflection nebula

Iris Nebula (NGC 7023 and LBN487)
Observation data: J2000.0 epoch
Right ascension 21h 01m 35.60s
Declination +68° 10 10.0"
Distance 1,300 ly
Apparent magnitude (V) 6.8
Apparent dimensions (V) 18' x 18'
Constellation Cepheus
Physical characteristics
Radius 3 ly
Designations NGC 7023 and LBN487, Caldwell 4

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.[1] 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.[2]

Notes

  1. Perkins, Philip (2005). "NGC 7023". astrocruise.com. Retrieved 2008-08-06.
  2. Nemiroff, Robert; Bonnell, Jerry (2004-11-04). "APOD: 2004 November 4 - NGC 7023: The Iris Nebula". APOD (NASA). Retrieved 2008-08-06.

References

External links

Wikimedia Commons has media related to NGC 7023.
Map showing location of NGC 7023 (Roberto Mura)

Coordinates: 21h 01m 36s, +68° 09′ 48″

This article is issued from Wikipedia - version of the Sunday, April 03, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.