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Shapley 1/Sp 1
Emission nebula
Planetary nebula
Fine Ring Nebula — captured here by the ESO Faint Object Spectrograph and Camera mounted on the New Technology Telescope at the La Silla Observatory in Chile.^[1] Credit ESO.
Observation data: J2000 epoch
Right ascension	15^h 51^m 42.75^s
Declination	−51° 31′ 30.5″
Distance	~4900^[2] ly
Apparent magnitude (V)	12.6
Apparent dimensions (V)	1.1'
Constellation	Norma
Physical characteristics
Radius	0.8 ly

Notable features	Central star is a white dwarf with a magnitude of 14.
Designations	PLN 329+2.1
See also: Lists of nebulae

Shapley 1 (Sp 1 or PLN 329+2.1)^[3] is an annular planetary nebula in the constellation of Norma with a magnitude of +12.6.^[4] As viewed from Earth, it is peculiar in that it seems to be a non-bipolar, torus-shaped planetary nebula. However, it is thought that this is due to the viewpoint of looking directly down on a binary system whose orbit is perpendicular to Earth.^[2]

Discovered in 1936 by Harlow Shapley,^[3]^[4] it is approximately 4900 light years from Earth, and is around 8700 years old.^[2] At the center of the nebula is a magnitude 14 white dwarf star. It has an angular diameter of 1.1 arc minutes,^[5] which makes it about one-third (.32) of a light year across.

References

^ "Smoke Signals in Space". Picture of the Week. ESO. Retrieved 1 August 2011.
^ ^a ^b ^c Jones, D.; Mitchell, D. L.; Lloyd, M.; Pollacco, D.; O'Brien, T. J.; Meaburn, J.; Vaytet, N. M. H. (2012). "The morphology and kinematics of the Fine Ring Nebula, planetary nebula Sp 1, and the shaping influence of its binary central star". Monthly Notices of the Royal Astronomical Society. 420 (3): 2271–79. arXiv:1111.2860. Bibcode:2012MNRAS.420.2271J. doi:10.1111/j.1365-2966.2011.20192.x. S2CID 119164201.
^ ^a ^b "Shapley1". Astrosurf. Retrieved 2009-10-12.
^ ^a ^b Darling, David. "Shapley 1". David Darling Encyclopedia. Retrieved 2009-10-21.
^ "Shapley 1". David Darling. Retrieved 10 February 2013.

Constellation of Norma

List of stars in Norma

Stars

Bayer	γ¹ γ² δ ε ζ η θ ι¹ ι² κ λ μ
Variable	R S T RT RZ IM QU QV QX V378
HD	142415 143183 143361 148156 148937 330075
Other	1E 161348-5055 2M1540 2XMM J160050.7–514245 (Apep) SCR J1546−5534 SGR J1550−5418 XTE J1550–564

Exoplanets	HD 142415 b HD 143361 b HD 148156 b HD 330075 b

Star clusters	NGC 5925 NGC 5999 NGC 6005 NGC 6031 NGC 6067 NGC 6087 NGC 6115 NGC 6134 NGC 6152 NGC 6167 NGC 6169

Nebulae	Mz 1 Mz 3 RCW 103 SDC 335.579-0.292 Shapley 1

Galaxy clusters	Norma Cluster