NGC 6826

{{Short description| Planetary nebula in the constellation Cygnus }}

__NOTOC__

{{Infobox nebula

| image = 250px

|caption = Hubble Space Telescope (HST) image of NGC 6826
Credit: HST/NASA/ESA.

| name = NGC 6826

| type = Planetary

| epoch = J2000

| ra = {{RA|19|44|48.2}}{{cite simbad

| title=NGC 6826

| access-date=2007-04-17}}

| dec = {{DEC|+50|31|30.3}}

| dist_ly = ~2000

| appmag_v = 8.8

| size_v = 27{{pprime}} × 24{{pprime}}{{cite web

| work=Stellar Scenes Image Collection

| title=NGC 6826

| url=http://www.ne.jp/asahi/stellar/scenes/object_e/ngc6826.htm

| access-date=2007-10-05

| archive-date=2016-03-03

| archive-url=https://web.archive.org/web/20160303202504/http://www.ne.jp/asahi/stellar/scenes/object_e/ngc6826.htm

| url-status=dead

}}

| constellation = Cygnus

| radius_ly = 0.22 x 0.20

| absmag_v =

| notes =

| names = HD 186924, SAO 31951, Caldwell 15

}}

File:NGC_6826_"Blinking_Eye".jpg

NGC 6826 (also known as Caldwell 15) is a planetary nebula located in the constellation Cygnus. It is commonly referred to as the "Blinking Planetary", although many other nebulae exhibit such "blinking". When viewed through a small telescope, the brightness of the central star overwhelms the eye when viewed directly, obscuring the surrounding nebula. However, it can be viewed well using averted vision, which causes it to "blink" in and out of view as the observer's eye wanders.

A distinctive feature of this nebula are the two bright patches on either side, which are known as Fast Low-Ionization Emission Regions, or FLIERS. They appear to be relatively young, moving outwards at supersonic speeds.{{cite web

| website=astroimages.org

| title=NGC 6826 : The Blinking Nebula

| url=http://www.astroimages.org/ccd/ngc6826.html

| access-date=2007-10-05}}

HD 186924 is the central star of the planetary nebula. It is an O-type star with a spectral type of O6fp.

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