Astronomy:NGC 6820 and NGC 6823

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NGC 6820 and NGC 6823
Emission nebula
NGC 6820/NGC 6823
Credit: Jeff Johnson
Observation data: J2000.0 epoch
Right ascension 19h 42m 27.92s[1]
Declination+23° 05′ 14.7″[1]
Distance6,000[2] ly
Apparent magnitude (V)7.1[3]
Apparent dimensions (V)40 arcmins
ConstellationVulpecula
DesignationsNGC 6820, Sh 2-86, GC 5945, Marth #401
NGC 6823, GC 4512, JH 2049, WH VII
See also: Lists of nebulae

NGC 6820 is an emission nebula that surrounds the much smaller open cluster NGC 6823 in Vulpecula.[4]

Messier 27 is found three degrees to the east, and α Vulpeculae three degrees to the west.

NGC 6820

The emission nebula NGC 6820 was discovered by Albert Marth on August 7, 1864.[5] The nebula is being pushed out and away by the radiation from the stars of NGC 6823, creating huge 'pillars' of gas and dust, similar to the pillars of creation.[4]

NGC 6823

NGC 6823 was discovered by William Herschel on July 17, 1785.[6] It is about 50 light-years across and lies about 6,000 light-years away. The center of the cluster formed about two million years ago and is dominated in brightness by a host of bright young blue stars. Outer parts of the cluster contain even younger stars.[2] It forms the core of the Vulpecula OB1 stellar association.[7]

  • NGC 6820 imaged by the Gemini North Telescope
    NGC 6820 imaged by the Gemini North Telescope
  • NGC 6820/NGC 6823 – Courtesy: Hunter Wilson
    NGC 6820/NGC 6823 – Courtesy: Hunter Wilson
  • NGC 6823
    NGC 6823

References

  1. ↑ 1.0 1.1 "NGC 6820". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6820. 
  2. ↑ 2.0 2.1 Nemiroff, R.; Bonnell, J., eds (4 October 2004). "NGC 6823: Cloud Sculpting Star Cluster". Astronomy Picture of the Day. NASA. https://apod.nasa.gov/apod/ap041004.html. 
  3. ↑ "NGC 6823 - Star Cluster + Nebula in Vulpecula". The Sky Live. https://theskylive.com/sky/deepsky/ngc6823-object. 
  4. ↑ 4.0 4.1 Greif, John (July 19, 2020). "NGC 6820 and NGC 6823". https://skyandtelescope.org/online-gallery/ngc-6820-and-ngc-6823/. 
  5. ↑ Segilman, Courtney. "Celestial Atlas". https://cseligman.com/text/atlas/ngc68.htm#6820. 
  6. ↑ Segilman, Courtney. "Celestial Atlas". https://cseligman.com/text/atlas/ngc68.htm#6823. 
  7. ↑ Billot, N.; Noriega-Crespo, A.; Carey, S.; Guieu, S.; Shenoy, S.; Paladini, R.; Latter, W. (2010). "Young Stellar Objects and Triggered Star Formation in the Vulpecula Ob Association". The Astrophysical Journal 712 (2): 797. doi:10.1088/0004-637X/712/2/797. Bibcode: 2010ApJ...712..797B. 



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