| Emission nebula | |
|---|---|
| Planetary nebula | |
 As seen from Mount Lemmon Observatory | |
| Observation data: J2000 epoch | |
| Right ascension | 20h 31m 33.2s |
| Declination | −07° 05′ 17″ |
| Constellation | Aquila |
| Notable features | A background galaxy gives it a "diamond ring" effect |
| Designations | PK 038-25.1, PN G038.1-25.4 |
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
[edit]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
[edit]| PMN J2033-0656 | |
|---|---|
| Observation data (J2000 epoch) | |
| Right ascension | 20h 31m 33.1s[4] |
| Declination | −07° 05′ 01″[4] |
| Distance | 253 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
[edit]References
[edit]- ^ a b c "Anne's Image of the Day: Planetary Nebula Abell 70". Anne's Astronomy News. 30 November 2013. Retrieved 17 February 2014.
- ^ Gottlieb, Steve (16 August 2001). "Best Abell Planetaries: Summer". Astronomy-Mall. Retrieved 27 October 2018.
- ^ a b 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.
- ^ a b c "Results for 2MASX J20313312-0705014". NASA/IPAC Extragalactic Database. Retrieved 25 October 2018.
- ^ "Astronomical Image Catalog: PNABELL70". ManTrapSkies.com. Retrieved 4 October 2019.
- ^ "PGC 187663". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 October 2018.
External links
[edit]
Media related to Abell 70 at Wikimedia Commons
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