Astronomy: May 2016 Archives

Asteroid thermal modeling in the presence of reflected sunlight with an application to WISE/NEOWISE observational data, (Revised version)

"As a result, the new analysis finds asteroid diameter and other physical properties that have large differences from published NEOWISE results, with greatly increased error estimates. NEOWISE results have a claimed ±10% accuracy for diameter estimates, but this is unsupported by any calculations and undermined by irregularities in the NEOWISE results."

NASA Response to Recent Paper on NEOWISE Asteroid Size Results, NASA

"Examination of the paper by members of the science community studying near-Earth objects has found several fundamental errors in Myhrvold's approach and analysis- mistakes that an independent peer review process is designed to catch. The errors in the paper lead to results that are easily refuted, such as sizes for well-known asteroids that are significantly larger or smaller than their already-verified sizes. While critique and re-examination of published results are essential to the scientific process, it is important that any paper undergo peer review by an independent journal before it can be seriously considered. This completes a necessary step to ensure science results are independently validated, reproducible, and of value to the science community."

Billionaire technologist accuses NASA asteroid mission of bad statistics, Science

"Myhrvold retorts that he is fixing the errors, which he says are cosmetic and do not alter the thrust of his criticism. He says the NEOWISE scientists are defensive because many are involved in a proposal for a future asteroid-hunting telescope called NEOCam, one of five finalists in NASA's Discovery program. "They're up for this NEOCam thing and they're afraid it looks bad. And it does look bad," he says."

Repurposed NEOWISE Spacecraft Observes and Discovers Asteroids, earlier post

Notice of Intent To Prepare an Environmental Impact Statement and Initiate Section 106 Consultation for Proposed Changes to Arecibo Observatory Operations, Arecibo, Puerto Rico and Notice of Public Scoping Meetings and Comment Period, NSF

"Through a series of academic community-based reviews, NSF has identified the need to divest several facilities from its portfolio in order to retain the balance of capabilities needed to deliver the best performance on the key science of the present decade and beyond. In 2012, NSF's Division of Astronomical Sciences' (AST's) portfolio review committee recommended that ``continued AST involvement in Arecibo . . . be re-evaluated later in the decade in light of the science opportunities and budget forecasts at that time.'' In 2016, NSF's Division of Atmospheric and Geospace Sciences' (AGS') portfolio review committee recommended significantly decreasing funding for the Space and Atmospheric Sciences portion of the Arecibo mission. In response to these evolving recommendations, in 2016, NSF completed a feasibility study to inform and define options for the observatory's future disposition that would involve significantly decreasing or eliminating NSF funding of Arecibo."

World's largest radio telescope nears completion

"China's gigantic Five hundred meter Aperture Spherical Telescope (FAST) is nearing completion in China's southwestern Guizhou Province and will soon begin searching the skies for phenomena including signs of extraterrestrial life. Construction of 500m diameter, 1.2 billion yuan (US$185mln) radio telescope began in 2011 and is on course to come online in September, when it will become the world's largest and most sensitive radio telescope."

Gregg Popovich reminds us that a lost game is nothing compared to NASA finding 1,200 habitable planets, USA Today

"On Thursday night, the Spurs lost to the Thunder in Game 6 and were knocked out of the postseason. On Tuesday, NASA announced that it found 1,284 new planets - the biggest group of planets ever discovered. ... Popovich says: "NASA discovered all those habitable planets the other day. Do you guys know about that? (a reporter says there were 1,200 planets found) 1,200 habitable planets. And then last night somebody lost a basketball game (reporters begin chuckling) Come on. Get over yourself."

NASA's Kepler Mission Announces Largest Collection of Planets Ever Discovered, NASA

"In the newly-validated batch of planets, nearly 550 could be rocky planets like Earth, based on their size. Nine of these orbit in their sun's habitable zone, which is the distance from a star where orbiting planets can have surface temperatures that allow liquid water to pool. With the addition of these nine, 21 exoplanets now are known to be members of this exclusive group."

Keith's note: Perhaps Seth Statler should have read the story he linked to a little more closely - before tweeting it. That said, it is certainly nice that news of Kepler's discovery of planets circling other stars has expanded beyond the usual space and astronomy fans to a much broader portion of the general population. More importantly, its good that the true scope and significance of such discoveries is made known by prominent figures in public venues to audiences who'd usually not hear mention of astronomy news. Alas, NASA staff (like Statler), some news media, and the general public now need to get a briefing as to what terminology such as "inhabited" vs "habitable", "earth-sized" vs "earthlike" means. Again, to be clear, it is very good news that Kepler's discoveries showed up where no NASA press release has surfaced before. NASA now needs to be building up on this - and do so strategically.

Keith's note: Just in case you missed this post last Wednesday.

NASA to Announce Latest Kepler Discoveries During Media Teleconference

"NASA will host a news teleconference at 1 p.m. EDT Tuesday, May 10 to announce the latest discoveries made by its planet-hunting mission, the Kepler Space Telescope. The briefing participants are: ... Timothy Morton, associate research scholar at Princeton University in New Jersey ..."

False Positive Probabilities for all Keper Objects of Interest: 1,284 Newly Validated Planets and 428 Likely False Positives

"We present astrophysical false positive probability calculations for every Kepler Object of Interest (KOI)the first large-scale demonstration of a fully automated transiting planet validation procedure. Out of 7056 KOIs, we determine that 1935 have probabilities <1% to be astrophysical false positives, and thus may be considered validated planets. 1284 of these have not yet been validated or confirmed by other methods. In addition, we identify 428 KOIs likely to be false positives that have not yet been identified as such, though some of these may be a result of unidentified transit timing variations. A side product of these calculations is full stellar property posterior samplings for every host star, modeled as single, binary, and triple systems. These calculations use vespa, a publicly available Python package able to be easily applied to any transiting exoplanet candidate."



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This page is an archive of entries in the Astronomy category from May 2016.

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