Abell 70

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Wikipedia

Abell 70
Emission nebula
Planetary nebula
As seen from Mount Lemmon Observatory
Observation data: J2000 epoch
Right ascension20h 31m 33.2s
Declination−07° 05′ 17″
ConstellationAquila
Notable featuresA background galaxy gives it a "diamond ring" effect
DesignationsPK 038-25.1, PN G038.1-25.4
See also: Lists of nebulae

Abell 70 is a slightly elongated planetary nebula located 13,500-17,500 light years away in the constellation of Aquila. It is approaching the earth at 79 kilometers per second and expanding 38 kilometers per second. There is a galaxy named PMN J2033-0656 behind Abell 70, giving it a "diamond ring" effect.[1]

Composition

The faint OIII ring structure can be seen through a telescope.[2] The central star of Abell 70 is a binary star system consisting of a hot white dwarf and a G-type subgiant star.[3] The subgiant star is a barium star[1] that rotates rapidly (with a period of about 2 days) and is variable due to starspots.[3]

Background galaxy

PMN J2033-0656
Observation data (J2000 epoch)
Right ascension20h 31m 33.1s[4]
Declination−07° 05′ 01″[4]
Distance253 Mly (78 Mpc)[5]
Characteristics
Apparent size (V)1.1' × 0.3'[4]
Other designations
2MASX J20313312-0705014, 6dFGS gJ203133.1-070502, PGC 187663, LEDA 187663, NVSS J203133-070522[6]

PMN J2033-0656 is an edge-on radio galaxy. Its position gives Abell 70 a diamond ring effect at its northern edge.[1]

See also

References

  1. 1 2 3 "Anne's Image of the Day: Planetary Nebula Abell 70". Anne's Astronomy News. 30 November 2013. Archived from the original on 23 February 2014. Retrieved 17 February 2014.
  2. ↑ Gottlieb, Steve (16 August 2001). "Best Abell Planetaries: Summer". Astronomy-Mall. Retrieved 27 October 2018.
  3. 1 2 Jones, David; Boffin, Henri M J.; Brown, Alex J.; Zak, Jiri; Hume, George; Munday, James; Miszalski, Brent (2022). "A detailed study of the barium central star of the planetary nebula Abell 70". Monthly Notices of the Royal Astronomical Society. 516 (4): 4833–4843. arXiv:2208.14778. Bibcode:2022MNRAS.516.4833J. doi:10.1093/mnras/stac2501.
  4. 1 2 3 "Results for 2MASX J20313312-0705014". NASA/IPAC Extragalactic Database. Retrieved 25 October 2018.
  5. ↑ "Astronomical Image Catalog: PNABELL70". ManTrapSkies.com. Retrieved 4 October 2019.
  6. ↑ "PGC 187663". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 October 2018.
  • Media related to Abell 70 at Wikimedia Commons