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By NASA
SpaceX A SpaceX Falcon Heavy rocket with the National Oceanic and Atmospheric Administration’s GOES-U (Geostationary Operational Environmental Satellite) satellite lifts off from NASA’s Kennedy Space Center in Florida on June 25, 2024. GOES-U is the fourth and final satellite in the current series of advanced weather satellites; it will provide continuous coverage of weather and hazardous environmental conditions across much of the Western Hemisphere.
In addition to its critical role in predicting weather on Earth, the GOES series of satellites helps forecasters predict space weather near Earth that can interfere with satellite electronics, GPS, and radio communications. The GOES-U satellite has a new space weather instrument, the Compact Coronograph-1, which blocks the Sun’s bright light so scientists can observe the relatively fainter solar atmosphere.
GOES-U will take about two weeks to reach geostationary orbit. Once there, the satellite will be renamed GOES-19. Follow GOES-U’s journey.
Image Credit: SpaceX
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By NASA
Crews transport NOAA’s (National Oceanic and Atmospheric Administration) Geostationary Operational Environmental Satellite (GOES-U) from the Astrotech Space Operations facility to the SpaceX hangar at Launch Complex 39A at NASA’s Kennedy Space Center in Florida beginning on Friday, June 14, 2024, with the operation finishing early Saturday, June 15, 2024. NASA/Ben Smegelsky NASA invites the public to participate in virtual activities and events leading up to the launch of the NOAA (National Oceanic and Atmospheric Administration) GOES-U (Geostationary Operational Environmental Satellite-U) mission.
NASA is targeting a two-hour window opening at 5:16 p.m. EDT Tuesday, June 25, for the launch of the weather satellite aboard a SpaceX Falcon Heavy rocket from Launch Complex 39A at the agency’s Kennedy Space Center in Florida.
Live launch coverage will begin at 4:15 p.m. and will air on NASA+, the agency’s website, and other digital channels. Learn how to stream NASA TV through a variety of platforms.
As the fourth and final satellite in NOAA’s GOES-R Series, GOES-U will enhance meteorologists’ ability to provide advanced weather forecasting and warning capabilities. GOES-U also will improve the detection and monitoring of space weather hazards using a new compact coronagraph instrument.
Members of the public can register to attend the launch virtually. As a virtual guest, you will have access to curated resources, schedule changes, and mission-specific information delivered straight to your inbox. Following each activity, virtual guests will receive a commemorative stamp for their virtual guest passport.
Stay updated on the mission by following NASA’s GOES blog:
https://blogs.nasa.gov/goes/
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By NASA
Artist’s concept of a previously proposed possible planet, HD 26965 b – often compared to the fictional “Vulcan” in the Star Trek universe. Credit: JPL-Caltech The discovery
A planet thought to orbit the star 40 Eridani A – host to Mr. Spock’s fictional home planet, Vulcan, in the “Star Trek” universe – is really a kind of astronomical illusion caused by the pulses and jitters of the star itself, a new study shows.
Key facts
The possible detection of a planet orbiting a star that Star Trek made famous drew excitement and plenty of attention when it was announced in 2018. Only five years later, the planet appeared to be on shaky ground when other researchers questioned whether it was there at all. Now, precision measurements using a NASA-NSF instrument, installed a few years ago atop Kitt Peak in Arizona, seem to have returned the planet Vulcan even more definitively to the realm of science fiction.
Details
Two methods for detecting exoplanets – planets orbiting other stars – dominate all others in the continuing search for strange new worlds. The transit method, watching for the tiny dip in starlight as a planet crosses the face of its star, is responsible for the vast majority of detections. But the “radial velocity” method also has racked up a healthy share of exoplanet discoveries. This method is especially important for systems with planets that don’t, from Earth’s point of view, cross the faces of their stars. By tracking subtle shifts in starlight, scientists can measure “wobbles” in the star itself, as the gravity of an orbiting planet tugs it one way, then another. For very large planets, the radial velocity signal mostly leads to unambiguous planet detections. But not-so-large planets can be problematic.
Even the scientists who made the original, possible detection of planet HD 26965 b – almost immediately compared to the fictional Vulcan – cautioned that it could turn out to be messy stellar jitters masquerading as a planet. They reported evidence of a “super-Earth” – larger than Earth, smaller than Neptune – in a 42-day orbit around a Sun-like star about 16 light-years away. The new analysis, using high-precision radial velocity measurements not yet available in 2018, confirms that caution about the possible discovery was justified.
The bad news for Star Trek fans comes from an instrument known as NEID, a recent addition to the complex of telescopes at Kitt Peak National Observatory. NEID, like other radial velocity instruments, relies on the “Doppler” effect: shifts in the light spectrum of a star that reveal its wobbling motions. In this case, parsing out the supposed planet signal at various wavelengths of light, emitted from different levels of the star’s outer shell, or photosphere, revealed significant differences between individual wavelength measurements – their Doppler shifts – and the total signal when they were all combined. That means, in all likelihood, the planet signal is really the flickering of something on the star’s surface that coincides with a 42-day rotation – perhaps the roiling of hotter and cooler layers beneath the star’s surface, called convection, combined with stellar surface features such as spots and “plages,” which are bright, active regions. Both can alter a star’s radial velocity signals.
While the new finding, at least for now, robs star 40 Eridani A of its possible planet Vulcan, the news isn’t all bad. The demonstration of such finely tuned radial velocity measurements holds out the promise of making sharper observational distinctions between actual planets and the shakes and rattles on surfaces of distant stars.
Fun facts
Even the destruction of Vulcan has been anticipated in the Star Trek universe. Vulcan was first identified as Spock’s home planet in the original 1960s television series. But in the 2009 film, “Star Trek,” a Romulan villain named Nero employs an artificial black hole to blow Spock’s home world out of existence.
The discoverers
A science team led by astronomer Abigail Burrows of Dartmouth College, and previously of NASA’s Jet Propulsion Laboratory, published a paper describing the new result, “The death of Vulcan: NEID reveals the planet candidate orbiting HD 26965 is stellar activity,” in The Astronomical Journal in May 2024 (Note: HD 26965 is an alternate designation for the star, 40 Eridani A.)
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