Shapley 1 ( Shapley 1 , Sp 1 , PLN 329 + 2.1 ) [4] - an annular planetary nebula in the constellation of the Nagon ; has a apparent magnitude of +12.6. [5] When observed from Earth, it has the shape of a torus, which is possibly caused by the perpendicularity of the observer’s line of sight and the orbit of the central binary. [2]
| Shapley 1 | |
|---|---|
| planetary nebula | |
 | |
| Research history | |
| Discoverer | Harlow Shapley |
| opening date | 1936 |
| Designations | Sp 1, PLN 329 + 2.1, PK 329 + 02.1, Hen 2-137, IRAS 15479-5122, ESO 225-2 |
| Observational data ( Age J2000.0 ) | |
| Right ascension | |
| Declination | |
| Distance | 4900 [2] / 1000 [3] St. years old |
| Visible magnitude (V) | 12.6 |
| Visible Dimensions (V) | 1.1 '× 1.1' |
| Constellation | The rectangle |
The nebula was discovered in 1936 by Harlow Shapley . [4] [5] The distance to the nebula is about 4900 light years (according to other sources, the distance is about 1000 light years [3] ), the age is estimated at 8700 years. [2] The angular dimensions of the nebula are 1.1 angular minutes, [5] which corresponds to the diameter of the nebula equal to one third of the light year. In the center of the nebula is a double star with a circulation period of about 2.9 days.
Notes
- ↑ PN Sp 1 - Planetary Nebula . SIMBAD Date of treatment May 20, 2017.
- ↑ 1 2 3 Jones, D .; Mitchell, DL; Lloyd, M .; Pollacco, D .; O'Brien, TJ; Meaburn, J .; Vaytet, NMH The morphology and kinematics of the Fine Ring Nebula, planetary nebula Sp 1, and the shaping influence of its binary central star (Eng.) // Monthly Notices of the Royal Astronomical Society : journal. - Oxford University Press , 2012 .-- Vol. 420 , no. 3 . - P. 2271-2279 . - DOI : 10.1111 / j.1365-2966.2011.201192.x . - . - arXiv : 1111.2860 .
- ↑ 1 2 Shapley 1 . Space Images . Northwestern University. Date of treatment October 21, 2009.
- ↑ 1 2 Shapley1 . Astrosurf. Date of treatment October 12, 2009.
- ↑ 1 2 3 Darling, David. Shapley 1 . David Darling Encyclopedia . Date of treatment October 21, 2009.