Nifwl Helics

Nifwl planedol mawr a leolir yng nghytser y Dyfrwr yw Nifwl Helics (a elwir hefyd yn NGC 7293 neu Caldwell 63). Daranfuwyd gan Karl Ludwig Harding cyn 1824, ac hwn yw un o'r nifylau planedol llachar sy'n agosaf i'r Ddaear,^[1] tua 215 parsec neu 700 blwyddyn golau i ffwrdd. Mae'n debyg ei olwg i Nifwl y Fodrwy.^[2] Oherwydd ei olwg, mae'r Helics wedi ennill y llysenw Llygad Duw.^[3]

Cyfeiriadau golygu

↑ Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode 2006ApJ...652..426H. doi:10.1086/507944.
↑ O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal 123 (6): 3329–3347. Bibcode 2002AJ....123.3329O. doi:10.1086/340726. https://archive.org/details/sim_astronomical-journal_2002-06_123_6/page/3329.
↑ "Urban Legends Reference Pages". The Eye of God. Cyrchwyd 2007-07-16.

Eginyn erthygl sydd uchod am nifwl. Gallwch helpu Wicipedia drwy ychwanegu ato.

[Horaetal2006-1] Hora, Joseph L.; Latter, William B.; Smith, Howard A.; Marengo, Massimo (2006). "Infrared Observations of the Helix Planetary Nebula". The Astrophysical Journal 652 (1): 426–441. arXiv:astro-ph/0607541. Bibcode 2006ApJ...652..426H. doi:10.1086/507944.

[ODelletal2002-2] O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal 123 (6): 3329–3347. Bibcode 2002AJ....123.3329O. doi:10.1086/340726. https://archive.org/details/sim_astronomical-journal_2002-06_123_6/page/3329.

[3] "Urban Legends Reference Pages". The Eye of God. Cyrchwyd 2007-07-16.

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