Abell 70

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]

Abell 70

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
See also: Lists of nebulae

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 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

• Abell 7
• Abell 33