View source for NGC 5189

{{short description|Planetary nebula in the constellation Musca}}
{{Use dmy dates|date=April 2014}}
{{Planetary nebula |
| name = NGC 5189
| image = [[File:NGC 5189.png|300px]]
| caption = NGC 5189 image taken with the [[Hubble Space Telescope]] on July 6, 2012
| type = Planetary
| epoch = J2000.0
| ra = {{RA|13|33|32.97}}
| dec = {{DEC|-65|58|26.7}}
| dist_ly = 3000
| appmag_v = 8.2, 8.5p
| size_v = 90 × 62 [[Minute and second of arc|arcsec]]
| constellation = [[Musca]]
| radius_ly = ~1
| absmag_v = -
| notes = A peculiar PN with a binary in the center
| names = Spiral Planetary Nebula, [[Gum catalog|Gum]] 47, IC 4274, He2-94, Sa2-95, PK 307-3.1
}}

'''NGC 5189''' ('''Gum 47''', '''IC 4274''', nicknamed '''Spiral Planetary Nebula''') is a [[planetary nebula]] in the [[constellation]] [[Musca]]. It was discovered by [[James Dunlop]] on 1 July 1826, who catalogued it as Δ252.<ref>{{Cite web |title=NGC 5189 (Mus) |url=https://www.southastrodel.com/NGC5189.htm |url-status=dead |archive-url=https://web.archive.org/web/20140114135738/https://www.southastrodel.com/NGC5189.htm |archive-date=2014-01-14 |website=Southern Astronomical Delights}}</ref> For many years, well into the 1960s, it was thought to be a bright emission nebula. It was  [[Karl Gordon Henize]] in 1967 who first described NGC 5189 as quasi-planetary based on its spectral emissions.

Seen through the telescope it seems to have an ''S'' shape, reminiscent of a [[barred spiral galaxy]]. The ''S'' shape, together with [[Point reflection|point-symmetric]] knots in the nebula, have for a long time hinted to astronomers that a [[Binary star|binary]] central star is present.<ref>{{Cite journal |last=Phillips |first=J. P. |last2=Reay |first2=N. K. |date=1983 |title=Ansae and the precession of central stars in planetary nebulae - The cases of NGC 5189 and NGC 6826 |journal=Astronomy and Astrophysics |volume=117 |pages=33–37 |bibcode=1983A&A...117...33P}}</ref> 
The Hubble Space Telescope imaging analysis showed that this ''S'' shape structure is indeed two dense low-ionization regions: one moving toward the north-east and another one moving toward the south-west of the nebula,<ref name="Danehkar2018">{{Cite journal |last=Danehkar |first=Ashkbiz |last2=Karovska |first2=Margarita |last3=Maksym |first3=W. Peter |last4=Montez |first4=Rodolfo |date=January 2018 |title=Mapping Excitation in the Inner Regions of the Planetary Nebula NGC 5189 Using HST WFC3 Imaging |journal=The Astrophysical Journal |volume=852 |issue=2 |pages=87 |arxiv=1711.11111 |bibcode=2018ApJ...852...87D |doi=10.3847/1538-4357/aa9e8c |issn=0004-637X |s2cid=119365610 |doi-access=free}}</ref> which could be a result of a recent outburst from the central star. Observations with the [[Southern African Large Telescope]] have finally found a [[white dwarf]] companion in a 4.04 day orbit around the rare low-mass [[Wolf–Rayet star|Wolf-Rayet]] type central star of NGC 5189.<ref>{{Cite journal |last=Manick |first=Rajeev |last2=Miszalski |first2=Brent |last3=McBride |first3=Vanessa |date=2015-04-01 |title=A radial velocity survey for post-common-envelope Wolf–Rayet central stars of planetary nebulae: first results and discovery of the close binary nucleus of NGC 5189★ |journal=Monthly Notices of the Royal Astronomical Society |language=en |volume=448 |issue=2 |pages=1789–1806 |arxiv=1501.03373 |bibcode=2015MNRAS.448.1789M |doi=10.1093/mnras/stv074 |issn=1365-2966 |s2cid=118600965 |doi-access=free}}</ref> NGC 5189 is estimated to be 546 [[parsec]]s<ref name="simbad">{{cite simbad
  | title=NGC 5189
  | access-date=2012-12-21}}</ref> or 1,780 [[light year]]s away from [[Earth]]. Other measurements have yielded results up to 900 parsecs (~3000 light-years).<ref>{{Cite journal |last=Sabin |first=L. |last2=Vázquez |first2=R. |last3=López |first3=J. A. |last4=García-Díaz |first4=Ma. T. |last5=Ramos-Larios |first5=G. |display-authors=4 |date=2012 |title=The filamentary Multi-Polar Planetary Nebula NGC 5189 |url=http://www.astroscu.unam.mx/rmaa/RMxAA..48-2/PDF/RMxAA..48-2_lsabin.pdf |journal=Revista Mexicana de Astronomía y Astrofísica |volume=48 |pages=165–76 |arxiv=1203.1297 |bibcode=2012RMxAA..48..165S}}</ref>

==References==
{{reflist}}

==External links==
*{{commonscat-inline}}
*{{WikiSky}}
*{{APOD |date=11 December 1995 |title=NGC 5189: A Strange Planetary Nebula}}
*{{APOD |date=19 December 2012 |title=NGC 5189: An Unusually Complex Planetary Nebula}}
*[http://www.nasa.gov/mission_pages/hubble/science/ngc5189.html A Cosmic Holiday Ornament, Hubble-Style]
*[http://www.salt.ac.za/news/elusive-binary-system/ Southern African Large Telescope: Elusive Binary System]
{{Musca}}
{{Gum catalogue}}
{{Ngc55}}
{{Sky|13|33|32.97|-|65|58|26.7|3000}}

{{DEFAULTSORT:NGC 5189}}
[[Category:Musca]]
[[Category:NGC objects|5189]]
[[Category:Planetary nebulae]]
[[Category:Astronomical objects discovered in 1826|18260701]]
[[Category:IC objects]]
[[Category:Discoveries by James Dunlop]]