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- Written by: Francis Reddy
Familiar stars shine, nebulae glow, and nearby galaxies tantalize in a new panorama of the northern sky assembled from 208 pictures captured by NASA’s Transiting Exoplanet Survey Satellite, or TESS.
The planet hunter imaged about 75 percent of the sky in a two-year-long survey and is still going strong.
TESS has discovered 74 exoplanets, or worlds beyond our solar system. Astronomers are sifting through some 1,200 additional exoplanet candidates, where potential new worlds await confirmation. More than 600 of these candidates lie in the northern sky.
TESS locates planets by simultaneously monitoring many stars over large regions of the sky and watching for tiny changes in their brightness.
When a planet passes in front of its host star from our perspective, it blocks some of the star’s light, causing it to temporarily dim. This event is called a transit, and it repeats with every orbit of the planet around the star. This technique has proven to be the most successful planet-finding strategy so far, accounting for about three-quarters of the nearly 4,300 exoplanets now known.
The data collected also allow for the study of other phenomena such as stellar variations and supernova explosions in unprecedented detail.
The northern mosaic covers less of the sky than its southern counterpart, which was imaged during the mission’s first year of operations.
For about half of the northern sectors, the team decided to angle the cameras further north to minimize the impact of scattered light from Earth and the Moon. This results in a prominent gap in coverage.
TESS map of the northern sky
The northern panorama represents only a glimpse of the data TESS has returned. The mission splits each celestial hemisphere into 13 sectors. TESS imaged each sector for nearly a month using four cameras, which carry a total of 16 sensors called charge-coupled devices, or CCDs.
During its primary mission, the cameras captured a full sector of the sky every 30 minutes. This means each CCD acquired nearly 30,800 full science images.
Adding in other measurements, TESS has beamed back more than 40 terabytes so far – equivalent to streaming some 12,000 high-definition movies.
Remarkably, these numbers will rise sharply over the next year. TESS has now begun its extended mission, during which it will spend another year imaging the southern sky. The satellite will revisit planets discovered in its first year, find new ones, and fill in coverage gaps from its initial survey.
Improvements to the satellite’s data collection and processing now allow TESS to return full sector images every 10 minutes and measure the brightness of thousands of stars every 20 seconds – all while continuing its previous strategy of measuring the brightness of tens of thousands of stars every two minutes.
“These changes promise to make TESS’s extended mission even more fruitful,” said Padi Boyd, the mission’s project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “Making high-precision measurements of stellar brightness at these frequencies makes TESS an extraordinary new resource for studying flaring and pulsating stars and other transient phenomena, as well as for exploring the science of transiting exoplanets.”
TESS is a NASA Astrophysics Explorer mission led and operated by MIT in Cambridge, Massachusetts, and managed by NASA's Goddard Space Flight Center. Additional partners include Northrop Grumman, based in Falls Church, Virginia; NASA’s Ames Research Center in California’s Silicon Valley; the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts; MIT’s Lincoln Laboratory; and the Space Telescope Science Institute in Baltimore. More than a dozen universities, research institutes, and observatories worldwide are participants in the mission.
Francis Reddy works for NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
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- Written by: Elizabeth Larson
On Friday, Lake County Public Health Officer Dr. Gary Pace reported that 28 new cases of COVID-19 had been reported countywide, bringing the total to 628.
That’s the second-largest single-day increase in cases reported in Lake County since cases began to be confirmed locally in April, based on a review of data publicly reported by Lake County Public Health.
Pace said late this week Public Health also received word of the county’s 13th COVID-19-related death.
“The individual was over 65 years old and had longstanding health issues,” he said.
This most recent death is connected to an outbreak at a second skilled nursing facility where there are 27 residents who have been infected along with nine staff, Pace said.
Pace did not name the facility, but the California Department of Public Health’s COVID-19 dashboard for skilled nursing facilities indicated the second facility is Rocky Point Care Center in Lakeport.
A previous outbreak at Lakeport Post Acute resulted in 37 residents getting the virus and 22 staff, with seven residents dying, according to state and local reports.
That initial outbreak, along with community spread, coincided with – and contributed to – a surge in new cases in Lake County, peaking at 78 during the week of Sept. 13 to 19. Pace said evacuations from the LNU Complex fires and Labor Day weekend activities were additional complicating factors.
Pace said the outbreak at Lakeport Post Acute is now under control, with no new cases in 10 days.
Meadowood Nursing Center in Clearlake has no reported cases in residents, and less than 11 in health care workers, the state reported.
On Friday, CDPH said 26,456 residents of California’s 1,223 skilled nursing facilities had tested positive for COVID-19 and 4,557 had died, while 19,989 health care workers in those facilities had contracted the virus, with 152 of them dying.
Statewide, county Public Health departments reported more than 849,000 total cases and just over 16,500 deaths due to COVID-19 as of Friday night.
The state said local health departments have reported 40,758 positive cases in health care workers and 191 deaths statewide.
As of Friday, 15,736,497 tests have been conducted in California, an increase of 112,874 over the prior 24-hour reporting period, the state said.
Pace said it’s predicted that COVID-19 infections will increase in the coming months, due to flu season, colder weather and indoor activities. He is urging community members to get flu shots.
As for when a COVID-19 vaccine would realistically be available, Pace said, “Likely after the first of the year.”
He added, “Initial supplies will be limited, and probably directed to hospital workers and others at highest risk.”
Once supplies increase – possibly in early spring – the vaccine will start to reach the general public, Pace said.
“There is great hope for some sort of normalcy by summertime 2021; the promise of a vaccine is driving those hopes,” he said.
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- Written by: Elizabeth Larson
NORTHERN CALIFORNIA – The growth of the Glass fire has stopped while cooler conditions are helping firefighters on the massive August Complex to continue to increase containment.
Cal Fire said the Glass fire remained at 67,484 acres on Friday night, marking the first day of no growth on the incident since it began on Sept. 27 in Napa and Sonoma counties.
Containment also grew several percentage points to 78 percent, Cal Fire said.
Officials said activity on the fire line on Friday was limited to scattered heat signatures and isolated smoldering heavy fuels across the fire area.
With conditions improving, on Friday the evacuation warnings for two areas south of Middletown in Lake County were lifted and a portion of Highway 29 from Middletown to Tubbs Lane was reopened.
Resources continue to be reduced on the fire. On Friday evening, 1,437 personnel remained assigned to the fire, along with 162 engines, 20 water tenders, 10 helicopters, 23 hand crews, 11 dozers and two masticators, Cal Fire reported.
On Friday night, Cal Fire said 2,560 structures remained threatened by the fire.
Cal Fire said the damage inspection has been completed. The final assessment showed that 638 structures have been destroyed in Sonoma County, including 334 single-family homes, while 917 buildings have been destroyed in Napa County, with 308 of them being homes. In addition, 132 structures were damaged in Sonoma County and 150 in Napa County.
Cal Fire continues to anticipate the fire will be fully contained on Oct. 20.
New team takes over August Complex South Zone
On Friday, the Southwest Area Type 1 Incident Management Team No. 1 assumed command of the August Complex South Zone, one of four zones on the complex. The other zones are the Northwest, Northeast and West.
The complex was up to 1,023,629 acres and 67-percent containment on Friday night, Cal Fire said. Approximately 4,524 personnel are assigned.
The US Forest Service said that on Thursday, a helicopter dropped water to support dozers and ground crews as they continued to secure the perimeter and mop-up around a 300-acre slop-over northeast of Lake Pillsbury, over the M6 Road near Bloody Rock.
Cooler temperatures and increased humidity are helping reduce fire activity, officials said. Pockets of heat within the fire’s perimeter are expected to continue to smolder. Firefighters will continue to mop up, monitor and patrol along the firelines.
The Forest Service said firefighters are currently assessing suppression repair needs. Suppression repair is a series of immediate post-fire actions taken to repair damages and minimize potential soil erosion and impacts resulting from fire suppression activities.
This work repairs the hand and dozer fire lines, roads, trails, staging areas, safety zones, and drop points used during fire suppression efforts.
For more information on the three phases of wildfire recovery visit this page.
Officials said the No. 1 priority remains firefighter and public safety. They asked that weekend travelers please be cautious while traveling on roads and highways as firefighters and equipment are working in the area.
The August Complex is expected to be fully contained Nov. 15, the Forest Service reported.
Email Elizabeth Larson at
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- Written by: Lake County News reports
The district said it has installed 4 megawatts of solar power and roughly half a megawatt of battery energy storage across five sites since 2012.
Installations include single-axis tracking systems in fields that track the sun throughout the day as well as fixed-tilt carports that provide shade in parking lots.
In fiscal year 2020, the district consumed 6,583,671 kWh of electricity with 92 percent of that total generated by the district’s solar projects.
The last system was commissioned in April 2020 and the district will now generate more than 100 percent of its overall electricity needs from the onsite solar projects.
Generating 100 percent of the annual electricity consumption means the Yuba Community College District is net-zero in its energy consumption.
The district said it has taken a proactive role managing and analyzing the systems and continues to work in partnership with the energy consulting firm ARC Alternatives to help understand the technical and financial performance of the systems.
Through the implementation of ARC Alternative’s Energy Performance Management service, the district is actively tracking each system’s performance, proactively working with operations and maintenance vendors to maximize energy production and receives regular reporting of the realized financial benefits of the solar projects.
“The YCCD Governing Board and leadership is committed to reducing our campuses’ carbon footprint for our students and our communities. Achieving ‘net zero’ with these solar and energy storage projects is not only environmentally responsible, it will continue to result in substantial financial benefit and lowered operating costs so that we can redirect those savings into programs and our students,” said Chancellor Dr. Douglas Houston. “Additionally, YCCD’s use of Clean Renewable Energy Bonds to finance these projects allows the District to apply General Obligation Bonds funds such as Measures J and Q to other important and needed facilities projects that directly impact student success.”
Over the entire life of the solar and storage projects, by the year 2040, it is anticipated that the district see a cumulative net benefit of approximately $19 million assuming an annual utility escalation rate of 3.5 percent.
The district’s leadership commitment to sustainability and investments in renewable energy have positioned the Yuba Community College District to be less reliant on continually escalating and expensive traditional power sources.
These direct investments in on-site renewable generation will continue to generate significant financial savings on utility costs and ultimately result in a positive net benefit to the district with reduced operating costs, officials said.
District officials said they recognize the positive environmental impacts from renewable energy sources and are proud to have taken a large step forward in reducing its carbon footprint.
According to the Environmental Protection Agency’s “Greenhouse Gas Equivalencies” calculation tool the district’s renewable energy projects will avoid roughly 4,500 metric tons of carbon dioxide from traditional power sources.
This is the equivalent greenhouse gas and carbon dioxide emissions from approximately:
– 900 passenger vehicles driven for one year;
– 500,000 gallons of gasoline consumed;
– 700 homes’ electricity use for one year.
The Yuba Community College District spans eight counties and nearly 4,192 square miles of territory in rural, north-central California. Yuba College and Woodland Community College, offer degrees, certificates, and transfer curricula at college campuses in Marysville and Woodland, educational centers in Clearlake and Yuba City, and through outreach operations in Williams and on Beale Air Force Base. The two colleges in Yolo County and Yuba County and the campuses in Clearlake, Colusa and Sutter counties, serve 13,000 students across the northern Sacramento Valley.