Engraved Hourglass Nebula

"Hourglass Nebula" redirects here. For the Hourglass Nebula in Sagittarius, see Lagoon Nebula. For other uses of hourglass, see Hourglass (disambiguation).

Short description: Planetary nebula in the constellation Musca

Hourglass NebulaEmission nebula

Planetary nebula
File:200px

1996 Hubble Space Telescope image of the Hourglass Nebula

Observation data: J2000 epoch
Right ascension|  13h 39m 35.116s[1]
Declination| −67° 22′ 51.45″[1]
Distance| 8,000 ly
Apparent magnitude (V)| 13.0[1]
Constellation| Musca
Physical characteristics
Radius| 0.29 ly
Notable features| Resembles a human eye
Designations| ESO 97-1,[1]

Engraved Hourglass Nebula,[1]
Etched Hourglass Nebula,[1]

PN MyCn 18[1], RCW 77
See also: Lists of nebulae

The Engraved Hourglass Nebula (also known as MyCn 18[2]) is a young planetary nebula in the southern constellation Musca. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924). At the time, it was designated simply as a small faint planetary nebula. Much improved telescopes and imaging techniques allowed the hourglass shape of the nebula to be discovered by Romano Coradi and Hugo Schwarz in images taken during 1991–1992 at the European Southern Observatory.[3] It is conjectured that MyCn 18's hourglass shape is produced by the expansion of a fast stellar wind within a slowly expanding cloud which is denser near its equator than its poles. The vivid colours given off by the nebula are the result of different 'shells' of elements being expelled from the dying star, in this case helium, nitrogen, oxygen and carbon. The central star of the nebula has a strong magnetic field[4].

The Hourglass Nebula was photographed by the Wide Field and Planetary Camera 2 of the Hubble Space Telescope.

A less-famous "Hourglass Nebula" is located inside the Lagoon Nebula.

## Videos

File:Engraved Hourglass Nebula.ogg

A 3D model of the Engraved Hourglass Nebula from the Galaxy Map app (iOS/Android)

## See also

* List of largest nebulae
* Lists of nebulae

## References

* "Hubble Finds an Hourglass Nebula around a Dying Star". January 16, 1996. http://hubblesite.org/newscenter/newsdesk/archive/releases/1996/07/.

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "PN MyCn 18". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=PN+MyCn+18.
2. ↑ MyCn stands for Margaret Walton Mayall (My) and Annie Jump Cannon (Cn), their 39-object catalogue was published in 1940 as New Peculiar Spectra in the Harvard College Observatory Bulletin, no. 913; Mayall has a later 139-object catalogue to her name, designated My: New Peculiar Spectra, Harvard College Observatory Bulletin, no. 920.
3. ↑ Corradi, Romano L. M.; Schwarz, Hugo E. (1993). "Bipolar nebulae and binary stars : the family of crabs He 2-104, BI Crucis and MyCn 18.". Astronomy and Astrophysics 268: 714. Bibcode: 1993A&A...268..714C.
4. ↑ The European Space Agency (16 July 2003). "The Hourglass Nebula (MyCn-18)". https://www.esa.int/Science_Exploration/Space_Science/The_Hourglass_Nebula_MyCn-18.

Coordinates:  13h 39m 35.12s, −67° 22′ 51.45″

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RCW Catalogue

* RCW 1 \- RCW 182

* See also: Emission nebula
* H I region
* H II region

* v
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Musca constellation

Stars (list)|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ1
* ζ2
* η
* θ
* ι1
* ι2
* λ
* μ
* λ Cha

|

Variable|

* R
* S
* T
* Y
* RT
* SY
* TU
* TV
* UU
* BO
* EZ
* FH
* GQ
* GR
* GS
* GT
* KY
* KZ
* LS
* MP
* V357

HR|

* 4387
* 4389
* 4401
* 4406
* 4425
* 4448
* 4485
* 4538
* 4549
* 4596
* 4597
* 4601
* 4604
* 4611
* 4614
* 4615
* 4664
* 4669
* 4692
* 4710
* 4720
* 4769
* 4804
* 4841
* 4862
* 4907
* 4966
* 4977
* 4994
* 5000
* 5002
* 5012
* 5030
* 5049
* 5069
* 5093
* 5119

HD|

* 98671
* 100546
* 101805
* 103482
* 105822
* 111232
* 112410
* 113919

Other|

* GRS 1124-683
* LP 145-141
* PSR J1141-6545
* 2S 1254-690

Star clusters|

| Open|

* NGC 4463
* NGC 4815

|

Globular|

* NGC 4372
* NGC 4833

Nebulae|

| Dark|

* BHR 71
* Dark Doodad Nebula

|

Planetary|

* Engraved Hourglass Nebula
* NGC 5189

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