Welcome to the Daily Telescope. There is a little too much darkness in this world and not enough light, a little too much pseudoscience and not enough science. We’ll let other publications offer you a daily horoscope. At Ars Technica, we’re going to take a different route, finding inspiration from very real images of a universe that is filled with stars and wonder.<\/p>\n
Good morning. It\u2019s November 10, and today\u2019s photo reveals a faint supernova.<\/p>\n
It has the formal name CTB-1, and after its discovery in the 1950s, it was thought to be a planetary nebula. (Regular readers will recall that planetary nebulae turned out to not have anything to do with planets.) CTB, in case you were wondering, stands for \u201cCal Tech Observatory catalog B.\u201d<\/p>\n
The object has since been recognized as the remnant of a supernova that is about 10,000 years old and is known colloquially as the \u201cGarlic Nebula.\u201d The reason should be fairly obvious. It also happens to be a difficult astronomical object to photograph, which is why I think today\u2019s submission from Ken Bates is so great.<\/p>\n
\u201cIt is an extremely faint object, and without narrowband filters, it\u2019s almost impossible to photograph,\u201d Bates told me. Narrowband filters capture specific wavelengths of light. \u201cNarrowband images quite often result in magenta stars, and since I don\u2019t really care for how that looks, I took additional exposures for about 2.5 hours in wide band using RGB filters. I removed the stars from the narrowband image, then extracted the stars from the RGB image, color-calibrated them using data from the GAIA satellite database, and then merged the color-calibrated stars into the narrowband image to give this result.\u201d<\/p>\n
The image itself consists of about 51.5 hours of total exposure time taken over a two-week period in late September and early October. Bates shot the Garlic nebula from his driveway in the Black Forest north of Colorado Springs.<\/p>\n
Source: Ken Bates.<\/p>\n
Do you want to submit a photo for the Daily Telescope? Reach out and say hello.<\/p>\n","protected":false},"excerpt":{"rendered":"
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