Astronomy:NGC 5189

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Short description: Planetary nebula in the constellation Musca
NGC 5189
Emission nebula
Planetary nebula
NGC 5189.png
NGC 5189 image taken with the Hubble Space Telescope on July 6, 2012
Observation data: J2000.0 epoch
Right ascension 13h 33m 32.97s
Declination−65° 58′ 26.7″
Distance3000 ly
Apparent magnitude (V)8.2, 8.5p
Apparent dimensions (V)90 × 62 arcsec
ConstellationMusca
Physical characteristics
Radius~1 ly
Absolute magnitude (V)-
Notable featuresA peculiar PN with a binary in the center
DesignationsSpiral Planetary Nebula, Gum 47, IC 4274, He2-94, Sa2-95, PK 307-3.1
See also: Lists of nebulae

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.[1] 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-symmetric knots in the nebula, have for a long time hinted to astronomers that a binary central star is present.[2] 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,[3] 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 type central star of NGC 5189.[4] NGC 5189 is estimated to be 546 parsecs[5] or 1,780 light years away from Earth. Other measurements have yielded results up to 900 parsecs (~3000 light-years).[6]

References

  1. Classic Deep-Sky and Double Stars : NGC 5189 (Mus) [1] Southern Astronomical Delights
  2. Phillips J. P.; Reay N. K. (1983). "Ansae and the precession of central stars in planetary nebulae - The cases of NGC 5189 and NGC 6826". Astronomy and Astrophysics 117: 33–37. Bibcode1983A&A...117...33P. 
  3. Danehkar, A.; Karovska, M.; Maksym, W.P.; Montez Jr., R. (2018). "Mapping Excitation in the Inner Regions of the Planetary Nebula NGC 5189 using HST WFC3 Imaging". Astrophys. J. 852 (2): 87. doi:10.3847/1538-4357/aa9e8c. Bibcode2018ApJ...852...87D. 
  4. Manick R.; Miszalski B.; McBride V. (2015). "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". Monthly Notices of the Royal Astronomical Society 448 (2): 1789–1806. doi:10.1093/mnras/stv074. Bibcode2015MNRAS.448.1789M. 
  5. "NGC 5189". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5189. 
  6. SABIN L.; VAZQUEZ R.; LOPEZ J.A.; GARCIA-DIAZ M.T. et al. (2012). "The filamentary multi-polar planetary nebula NGC 5189". Rev. Mex. Astron. Astrofís. 48: 165–76. Bibcode2012RMxAA..48..165S. http://www.astroscu.unam.mx/rmaa/RMxAA..48-2/PDF/RMxAA..48-2_lsabin.pdf. 

External links

Coordinates: Sky map 13h 33m 32.97s, −65° 58′ 26.7″