NGC 6302

Short description: Bipolar planetary nebula in the constellation Scorpius

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NGC 6302Emission nebula

Planetary nebula
File:240px

NGC 6302, as taken by Hubble Space Telescope

Observation data: J2000 epoch
Right ascension|  17h 13m 44.211s[1]
Declination| −37° 06′ 15.94″[1]
Distance| 3400 ± 500[2] ly (1040 ± 160[2] pc)
Apparent magnitude (V)| 7.1B[1]
Apparent dimensions (V)| >3′.0[2]
Constellation| Scorpius
Physical characteristics
Radius| >1.5 ± 0.2 ly[3] ly
Absolute magnitude (V)| -3.0B +0.4−0.3[4]
Notable features| Dual chemistry, hot central star
Designations| Bipolar Nebula,[1] Bug Nebula,[1]
PK 349+01 1,[1] Butterfly Nebula,[5][6] Sharpless 6, RCW 124, Gum 60, Caldwell 69
See also: Lists of nebulae

NGC 6302 (also known as the Bug Nebula, Butterfly Nebula, or Caldwell 69) is a bipolar type planetary nebula in the constellation Scorpius. The structure in this planetary nebula is among the most complex ever seen in any planetary nebulae. The spectrum of Butterfly Nebula shows that its central star is one of the hottest stars known, with a surface temperature in excess of 250,000 degrees Celsius. This implies that the star from which it formed must have been very large in order to become this hot.

The central star, a white dwarf, was identified in 2009, using the upgraded Wide Field Camera 3 on board the Hubble Space Telescope.[7] The star has a current mass of around 0.64 solar masses. The star is surrounded by a dense equatorial disc composed of gas and dust. This dense disc is postulated to have caused the star's outflows to form the bipolar structure seen in the Nebula.[8] similar to an hourglass. This bipolar structure shows features such as ionization walls, knots and sharp edges to the lobes.

## Contents

* 1 Observation history
* 2 Characteristics
* 3 Central star
* 4 Dust chemistry
* 5 See also
* 6 Notes
* 7 References
* 8 External links

## Observation history

Position of NGC 6302

As it is included in the New General Catalogue, this object has been known since at least 1888.[9] The earliest-known study of NGC 6302 is by Edward Emerson Barnard, who drew and described it in 1907.[2]

The nebula featured in some of the first images released after the final servicing mission of the Hubble Space Telescope in September 2009.[10]

## Characteristics

Error creating thumbnail: NGC 6302 imaged by the Gemini South telescope in hydrogen-alpha (red) and [O III] (blue) filters, showing the bipolar lobes and dark equatorial lane.

NGC 6302 has a complex structure, which may be approximated as bipolar with two primary lobes, though there is evidence for a second pair of lobes that may have belonged to a previous phase of mass loss. A dark lane runs through the waist of the nebula obscuring the central star at all wavelengths.[11]

The nebula contains a prominent northwest lobe which extends up to 3.0′ away from the central star and is estimated to have formed from an eruptive event around 1,900 years ago. It has a circular part whose walls are expanding such that each part has a speed proportional to its distance from the central star. At an angular distance of 1.71′ from the central star, the flow velocity of this lobe is measured to be 263 km/s. At the extreme periphery of the lobe, the outward velocity exceeds 600 km/s. The western edge of the lobe displays characteristics suggestive of a collision with pre-existing globules of gas which modified the outflow in that region.[2]

## Central star

The central star, among the hottest stars known, had escaped detection because of a combination of its high temperature (meaning that it radiates mainly in the ultraviolet), the dusty torus (which absorbs a large fraction of the light from the central regions, especially in the ultraviolet) and the bright background from the star. It was not seen in the first Hubble Space Telescope images;[6] the improved resolution and sensitivity of the new Wide Field Camera 3 of the same telescope later revealed the faint star at the centre.[12] A temperature of 200,000 Kelvin is indicated, and a mass of 0.64 solar masses. The original mass of the star was around five solar masses and would have been a B type main sequence star on the main sequence, likely a B5-9V, but most of its mass was ejected in the event which created the planetary nebula. The luminosity and temperature of the star indicate it has ceased nuclear burning and is on its way to becoming a white dwarf, fading at a predicted rate of 1% per year.

## Dust chemistry

The prominent dark lane that runs through the centre of the nebula has been shown to have an unusual composition, showing evidence for multiple crystalline silicates, crystalline water ice and quartz, with other features which have been interpreted as the first extra-solar detection of carbonates.[13] This detection has been disputed, due to the difficulties in forming carbonates in a non-aqueous environment.[14] The dispute remains unresolved.

One of the characteristics of the dust detected in NGC 6302 is the existence of both oxygen-bearing silicate molecules and carbon-bearing polycyclic aromatic hydrocarbons (PAHs).[13] Stars are usually either oxygen-rich or carbon-rich, the change from the former to the latter occurring late in the evolution of the star due to nuclear and chemical changes in the star's atmosphere. NGC 6302 belongs to a group of objects where hydrocarbon molecules formed in an oxygen-rich environment.[15]

## See also

* List of largest nebulae
* Lists of nebulae

## Notes

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 (SIMBAD 2007)
2. ↑ 2.0 2.1 2.2 2.3 2.4 (Meaburn López)
3. ↑ Radius = distance × sin(angular size / 2) = 3.4 ± 0.5 kly * sin(>3′.0 / 2) = >1.5 ± 0.2 ly
4. ↑ 7.1B apparent magnitude - 5 * (log10(1040 ± 160 pc distance) - 1) = -3.0B +0.4−0.3 absolute magnitude
5. ↑ (Nemiroff Bonnell)
6. ↑ 6.0 6.1 (Nemiroff Bonnell)
7. ↑ (Szyszka Walsh)
8. ↑ (Gurzadyan 1997)
9. ↑ Many sources credit its discovery to James Dunlop in 1826. E.g. (1) Wolfgang Steinicke, Nebel und Sternhaufen: Geschichte ihrer Entdeckung, Beobachtung und Katalogisierung- von Herschel bis Dreyers, 2009, p. 429. (2) Universe Today; (3) Stephen James O'Meara, The Caldwell objects. Cambridge University Press, 2002, p.274..
(O'Meara argues that Barnard credited it to Dunlop—but may have been mistaken.)
10. ↑ News Release Number: STScI-2009-25: Hubble Opens New Eyes on the Universe [1]
11. ↑ (Matsuura Zijlstra)
12. ↑ (Szyszka Walsh)
13. ↑ 13.0 13.1 (Kemper Molster)
14. ↑ (Ferrarotti Gail)
15. ↑ (Matsuura Zijlstra).

## References

* Nemiroff, R.; Bonnell, J., eds (June 2, 1998). "NGC 6302: The Butterfly Nebula". Astronomy Picture of the Day. NASA. https://apod.nasa.gov/apod/ap980602.html.
* Nemiroff, R.; Bonnell, J., eds (May 5, 2004). "NGC 6302: Big, Bright, Bug Nebula". Astronomy Picture of the Day. NASA. https://apod.nasa.gov/apod/ap040505.html.
* Szyszka, C.; Walsh, J. R; Zijlstra, A. A.; Tsamis, Y.G. (2009), "Detection of the Central Star of the Planetary Nebula NGC 6302", Astrophysical Journal Letters 707 (1): L32–L36, doi:10.1088/0004-637x/707/1/l32, Bibcode: 2009ApJ...707L..32S
* Gurzadyan, Grigor A. (1997), The Physics and Dynamics of Planetary Nebulae, Germany: Springer, pp. 3, ISBN 978-3-540-60965-0
* Meaburn, J.; López, J. A.; Steffen, W.; Graham, M. F. et al. (2005), "The Hubble-Type Outflows from the High-Excitation, Polypolar Planetary Nebula NGC 6302", The Astronomical Journal 130 (5): 2303–2311, doi:10.1086/496978, Bibcode: 2005AJ....130.2303M, http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005AJ....130.2303M
* Results for NGC 6302, SIMBAD, Centre de Données Astronomiques de Strasbourg, January 11, 2007, http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=NGC+6302
* Kemper, F.; Molster, F. J.; Jaeger, C.; Waters, L.B.F.M. (2002), "The mineral composition and spatial distribution of the dust ejecta of NGC 6302", Astronomy and Astrophysics 394 (2): 679–690, doi:10.1051/0004-6361:20021119, Bibcode: 2002A&A...394..679K
* Ferrarotti, A. S.; Gail, H.-P. (2005), "Mineral formation in stellar winds. V. Formation of calcium carbonate", Astronomy and Astrophysics 430 (3): 959–965, doi:10.1051/0004-6361:20041856, Bibcode: 2005A&A...430..959F
* Matsuura, M.; Zijlstra, A. A.; Molster, F.J.; Waters, L. B. F. M. et al. (2005), "The dark lane of the planetary nebula NGC 6302", Monthly Notices of the Royal Astronomical Society 359 (1): 383–400, doi:10.1111/j.1365-2966.2005.08903.x, Bibcode: 2005MNRAS.359..383M

## External links

* NASA News Release
* Discovery of the star
* ESA/Hubble News Release
* SIMBAD Query Result
*   * NGC 6302 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
* Butterfly Nebula at Constellation Guide
* NASA Astronomy Picture of the Day: The Butterfly Nebula from Hubble (1 October 2014)

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Sharpless catalog

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* See also: Gum catalog
* Nebula
* RCW Catalogue
* Stewart Sharpless

* v
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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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* e

Gum Catalog

Colin Stanley Gum

* Gum 1
* Gum 2
* Gum 3
* Gum 4
* Gum 5
* Gum 6
* Gum 7
* Gum 8
* Gum 9
* Gum 10
* Gum 12
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* Gum 76
* Gum 77
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* Gum 79
* Gum 80
* Gum 81
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* Gum 83
* Gum 84
* Gum 85

See also: Gum Nebula

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Astronomical catalogs

NGC|

* Astronomy:NGC 6297
* Astronomy:NGC 6298
* Astronomy:NGC 6299
* Astronomy:NGC 6300
* Astronomy:NGC 6301
* NGC 6302
* Astronomy:NGC 6303
* Astronomy:NGC 6304
* Astronomy:NGC 6305
* Astronomy:NGC 6306
* Astronomy:NGC 6307

Caldwell|

* C60
* C61
* C62
* C63
* C64
* C65
* C66
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* C70
* C71
* C72
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* C78

* v
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Caldwell catalogue

List|

* C1
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* C11
* C12
* C13
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* C79
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* C85
* C86
* C87
* C88
* C89
* C90
* C91
* C92
* C93
* C94
* C95
* C96
* C97
* C98
* C99
* C100
* C101
* C102
* C103
* C104
* C105
* C106
* C107
* C108
* C109

See also|

* Messier Catalogue
* Catalogue of Nebulae and Clusters of Stars
* New General Catalogue
* Index Catalogue
* Revised New General Catalogue
* Herschel 400 Catalogue

* Caldwell catalogue
* Category:Caldwell objects Astronomy
* Commons:Caldwell objects

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New General Catalogue 6000 to 6499

* 6000
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* 6360
* 6361
* 6362
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* 6364
* 6365
* 6366
* 6367
* 6368
* 6369
* 6370
* 6371
* 6372
* 6373
* 6374
* 6375
* 6376
* 6377
* 6378
* 6379
* 6380
* 6381
* 6382
* 6383
* 6384
* 6385
* 6386
* 6387
* 6388
* 6389
* 6390
* 6391
* 6392
* 6393
* 6394
* 6395
* 6396
* 6397
* 6398
* 6399
* 6400
* 6401
* 6402
* 6403
* 6404
* 6405
* 6406
* 6407
* 6408
* 6409
* 6410
* 6411
* 6412
* 6413
* 6414
* 6415
* 6416
* 6417
* 6418
* 6419
* 6420
* 6421
* 6422
* 6423
* 6424
* 6425
* 6426
* 6427
* 6428
* 6429
* 6430
* 6431
* 6432
* 6433
* 6434
* 6435
* 6436
* 6437
* 6438
* 6439
* 6440
* 6441
* 6442
* 6443
* 6444
* 6445
* 6446
* 6447
* 6448
* 6449
* 6450
* 6451
* 6452
* 6453
* 6454
* 6455
* 6456
* 6457
* 6458
* 6459
* 6460
* 6461
* 6462
* 6463
* 6464
* 6465
* 6466
* 6467
* 6468
* 6469
* 6470
* 6471
* 6472
* 6473
* 6474
* 6475
* 6476
* 6477
* 6478
* 6479
* 6480
* 6481
* 6482
* 6483
* 6484
* 6485
* 6486
* 6487
* 6488
* 6489
* 6490
* 6491
* 6492
* 6493
* 6494
* 6495
* 6496
* 6497
* 6498
* 6499

* Astronomical catalog
* List of NGC objects

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Original source: https://en.wikipedia.org/wiki/NGC 6302. Read more

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