| 词条 | NGC 6881 |
| 释义 |
| image = | caption = The butterfly-like planetary nebula NGC 6881 is visible here in an image taken by the NASA/ESA Hubble Space Telescope | name = NGC 6881 | type = Planetary | epoch = J2000 | ra = {{RA|20|10|52.45}}[1] | dec = {{DEC|+37|24|42.4}}[1] | dist_ly = 5200 ± 1600 | dist_pc = 1600 ± 500[2] | appmag_v = 13.700 B [1] | size_v = | constellation = Cygnus | radius_ly = | absmag_v = | notes = | names = GSC2 N033220122825, 2MASS J20105244+3724424, PN VV 250, CSI+37-20091, Hen 2-456, PK 074+02 1, PN ARO 108, GCRV 12543, IRAS 20090+3715, PN G074.5+02.1, PN VV' 526 }} NGC 6881 is a planetary nebula, located in the constellation of Cygnus. It is formed of an inner nebula, estimated to be about one fifth of a light-year across, and symmetrical structure that spread out about one light-year from one tip to the other. The symmetry could be due to a binary star at the nebula's centre. References1. ^1 2 {{cite simbad|title=NGC 6881|accessdate=12 March 2012}} {{Catalogs|NGC=6881}}{{nebula-stub}}2. ^{{cite journal|doi=10.1111/j.1365-2966.2011.18609.x|title=A distance estimate based on angular expansion for the planetary nebula NGC 6881|journal=Monthly Notices of the Royal Astronomical Society|volume=414|issue=4|pages=3129|year=2011|last1=Guzmán-Ramírez|first1=Lizette|last2=Gómez|first2=Yolanda|last3=Loinard|first3=Laurent|last4=Tafoya|first4=Daniel|arxiv = 1103.0231 |bibcode = 2011MNRAS.414.3129G }} 3 : Cygnus (constellation)|Planetary nebulae|NGC objects |
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