ask-astro-web-extra-why-is-the-fourth-known-planet-in-an-extrasolar-system-labeled-with-an-e-shouldnt-that-be-the-fifth-known-planet-or-is-the-star-always-ahttps://www.astronomy.com/science/ask-astro-web-extra-why-is-the-fourth-known-planet-in-an-extrasolar-system-labeled-with-an-e-shouldnt-that-be-the-fifth-known-planet-or-is-the-star-always-a/Ask Astro web extra: Why is the fourth known planet in an extrasolar system labeled with an "e"? Shouldn't that be the fifth known planet? Or is the star always "a"? | Astronomy.comcategories:Science | tags:Ask Astro, MagazineInStockUSD1.001.00sciencearticleASY2023-05-182010-01-2546529
Ask Astro web extra: Why is the fourth known planet in an extrasolar system labeled with an “e”? Shouldn’t that be the fifth known planet? Or is the star always “a”?
Associate Editor Liz Kruesi
By Astronomy Staff |
Published: January 25, 2010 | Last updated on May 18, 2023
