NGC 7009 (Chinese Wikipedia)
Analysis of information sources in references of the Wikipedia article "NGC 7009" in Chinese language version.
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arxiv.org
- Steffen, W.; Espíndola, M.; Martínez, S.; Koning, N. The 3D velocity structure of the planetary nebula NGC 7009. Revista Mexicana de Astronomía y Astrofísica. October 2009, 45: 143–54. Bibcode:2009RMxAA..45..143S. arXiv:0905.2148
. NGC 7009 is a planetary nebula with several morphological and kinematical sub-systems with multiple shells, a halo, jet-like streams, ansae and small-scale filaments and knots.
eso.org
- The Strange Structures of the Saturn Nebula. www.eso.org. [27 September 2017]. （原始内容存档于2018-12-17）.
harvard.edu
ui.adsabs.harvard.edu
- Steffen, W.; Espíndola, M.; Martínez, S.; Koning, N. The 3D velocity structure of the planetary nebula NGC 7009. Revista Mexicana de Astronomía y Astrofísica. October 2009, 45: 143–54. Bibcode:2009RMxAA..45..143S. arXiv:0905.2148 .
NGC 7009 is a planetary nebula with several morphological and kinematical sub-systems with multiple shells, a halo, jet-like streams, ansae and small-scale filaments and knots.
seds.org
messier.seds.org
- Messier Online Astronomical Database. Saturn Nebula. [2012-08-28]. （原始内容存档于2016-03-04）.
- SAC 110 best NGC object list. [2018-12-17]. （原始内容存档于2018-12-26）.
- RASC's Finest N.G.C. Objects Objects. [2018-12-17]. （原始内容存档于2018-12-17）.
- The Caldwell Catalog （页面存档备份，存于互联网档案馆） (#55)
web.archive.org
- The Strange Structures of the Saturn Nebula. www.eso.org. [27 September 2017]. （原始内容存档于2018-12-17）.
- Messier Online Astronomical Database. Saturn Nebula. [2012-08-28]. （原始内容存档于2016-03-04）.
- SAC 110 best NGC object list. [2018-12-17]. （原始内容存档于2018-12-26）.
- RASC's Finest N.G.C. Objects Objects. [2018-12-17]. （原始内容存档于2018-12-17）.
- The Caldwell Catalog （页面存档备份，存于互联网档案馆） (#55)