Image of the Week

26 February 2020: This long-exposure photograph shows the motion of stars during the night above the Blanco 4-meter telescope (left) and the SMARTS 1.5-meter telescope (right) at Cerro Tololo Inter-American Observatory in Chile, a program of the NSF’s National Optical-Infrared Astronomy Research Laboratory. Also visible in the photo are the trails left by astronomers walking to the Blanco telescope, created by their flashlights. Stars streak through the sky over the course of this one-hour exposure, appearing to spin around the south celestial pole in the upper left of the image. The star closest to the south celestial pole is Sigma Octantis, a relatively faint yellow giant star about 275 light-years from Earth. In contrast to the relatively bright north star, Polaris, Sigma Octantis is not bright enough to use for celestial navigation.

19 February 2020: As stars appear to circle around the north celestial pole, a new laser at the Gemini North telescope on Hawaii’s Maunakea undergoes rigorous testing, as seen in this image from early October 2019. The international Gemini Observatory, a program of the NSF's NOIRLab, recently completed testing of a new laser from the company TOPTICA which is a critical component in the telescope’s adaptive optics system. Adaptive optics utilize artificial guide stars, produced by a laser, as a reference when compensating for distortions caused by turbulence in the Earth’s atmosphere. The result is ultra-sharp images that rival the view from space.Laser commissioning activities required pointing at specific parts of the sky designed to both test and calibrate the state-of-the-art laser. This image is created from a stack of images that reveal the Earth’s rotation and the colors inherent in the images. The green glow near the horizon is due to airglow ...

12 February 2020: A young artist adds his touch to the United States National Science Foundation’s (NSF’s) graphic wall at the 235th meeting of the American Astronomical Society in Honolulu, Hawai‘i. This wall, designed by graphic designer Pete Marenfeld, was the center of the NSF Pavilion at the meeting, and encouraged participants to take a break from the meeting and indulge their creative sides — while exploring some of NSF’s world-class observatories which are part of NSF’s NOIRLab. A time-lapse video shows the fascinating evolution of this wall painting over the duration of the 4-day meeting. Equipped with neon chalk markers, visitors to the NSF Pavilion doodled, colored, and annotated to produce a collaborative work of art showcasing cutting-edge astronomical facilities such as the International Gemini Observatory, Kitt Peak National Observatory, Cerro Tololo Inter-American Observatory and the Vera C. Rubin Observatory which is currently under construction. With the AAS meeting concluded, the artwork ...

5 February 2020: This night-time photo of the Gemini South telescope on Cerro Pachón, Chile features a marvelous view of the Milky Way arching overhead and reflecting off some of the 668 photovoltaic panels that help power the facility. The same clear skies that provide such spectacular views of our galaxy also allow Gemini South, one of two telescopes making up the international Gemini Observatory a program of NSF’s Optical-Infrared Astronomy Research Laboratory, to enjoy abundant sunlight during the day — making solar panels a down-to-earth addition to the facility. Starlight isn’t bright enough to generate electricity at night, when the astronomical observations take place, but during daylight hours these solar panels can provide over 28% of the power needed to run the observatory — helping to keep astronomy environmentally friendly.

29 January 2020: When the weather conditions are just right, glowworms come out at night at Kitt Peak National Observatory. This glowworm crossed the road in front of the WIYN 3.5-meter telescope as the last of the summer Milky Way sets behind the WIYN dome. Although only the tail end of the glowworm is bioluminescent, the glowworm appears as a streak over the 10 second exposure, and the image shows how much distance it covered over the period of the exposure.

22 January 2020: After more than a week of wintery weather, the clouds started lifting over the Gemini North telescope of the international Gemini Observatory (center) on Maunakea. Joy Pollard of NSF’s National Optical-Infrared Astronomy Research Laboratory snapped this shot during a visit to the mountain on 15 January. While snow is not uncommon on the nearly 14,000-foot summit area, this is the first major snowfall this winter on the mountaintop. The snowfall left drifts as high as 2 meters (7 feet) surrounding Gemini North and required the recruitment of staff volunteers to help shovel snow off the dome in order to get back on the sky as quickly as possible.

15 January 2020: The Vera C. Rubin Observatory (formerly known as the Large Synoptic Survey Telescope or LSST — see the press release) is featured in this peaceful twilight image. Currently under construction on Cerro Pachón in the Chilean Andes, the Rubin Observatory will produce the Legacy Survey of Space and Time (LSST), a ten-year optical survey of the visible sky that begins in October 2022. The survey will be conducted using the 8.4-meter Simonyi Survey Telescope, which is currently being assembled inside the summit facility, and the 3200-megapixel DOE-funded LSST Camera, which is nearing completion at SLAC National Laboratory. The Rubin Observatory is expected to image 37 billion stars and galaxies during the survey, and will produce about 20 terabytes of data every night. In just the first year of the survey, it will image more asteroids, stars, quasars, and galaxies than all previous telescopes combined.

8 January 2020: The Milky Way arches high over the Blanco 4-meter Telescope at Cerro Tololo Inter-American Observatory (CTIO) in Chile. The Blanco 4-meter Telescope began operating in 1976, providing astronomers with a world-class observatory in the southern hemisphere, and it continues to produce cutting-edge science. The Blanco is currently equipped with the Dark Energy Camera (DECam), a state-of-the-art 500-megapixel camera which completed the five-year Dark Energy Survey in early 2019. DECam continues with an expanded mission and is providing astronomers with a powerful tool for studying dark energy, exoplanets and more.

1 January 2020: Every year around the winter solstice, the Sun appears to set behind Kitt Peak National Observatory as seen from Mount Lemmon almost 100 km (60 miles) away. Local photographers meet every year around the holidays to capture photos and videos of this interesting alignment. For a brief time, you can see many of the Kitt Peak telescopes, from the distinctive McMath-Pierce Solar telescope (left) to the large dome of the Mayall 4-meter telescope (right). The still image depicts the silhouettes of the telescopes with a green segment above the Sun and was taken on 17 December 2016. The video was captured on 20 December 2019. Links Sunset over Kitt Peak National Observatory

25 December 2019: The Milky Way hangs poised over the Gemini South telescope The colorful band of the Milky Way is poised above the 8.1-meter Gemini South telescope of NSF’s National Optical-Infrared Astronomy Research Laboratory in this arresting image, which depicts bright patches of stars threaded through with winding lanes of dust. The Galactic Center hangs directly above the telescope, framing one of the most powerful astronomical observatories in the southern hemisphere. The picture also captures the Large and Small Magellanic Clouds, which appear on the left side of the image. These dwarf irregular galaxies are satellites of the Milky Way, and lack the conspicuous spiral arms of larger nearby galaxies such as the Andromeda Galaxy (also part of the Local Group of galaxies which includes our Milky Way). Despite being a fraction of the size of the Milky Way, the Magellanic Clouds contain billions of stars, and together they are a prominent ...

18 December 2019: The staff of NSF’s NOIRLab wish you and yours a happy holiday season and hope your skies are clear, dark and full of stars!

11 December 2019: Jupiter, Venus and the Moon Converge over Observatories: Southern Astrophysical Research (SOAR) Telescope operator Carlos Corco obtained this image of the recent conjunction of Jupiter, Venus and the Moon (right) over the 8-meter Gemini South telescope (left) on Cerro Pachón in Chile. A conjunction is the apparent meeting of two or more celestial bodies in the night sky. Also visible (in the distance, just right of center) is the silhouette of the Large Synoptic Survey Telescope (LSST) which is currently under construction. In late 2022, LSST is slated to begin an unprecedented, decade-long, survey of the night sky in optical wavelengths, surveying the entire visible sky every few nights. Using an 8.4-meter mirror (with an effective aperture of about 6.7 meters) and the largest digital camera ever fabricated for optical astronomy, LSST will shed light on astronomical questions ranging from the nature of dark matter and dark energy to the ...

4 December 2019: Breathtaking observatory panorama showcases the Milky Way This breathtaking panorama, captured by Hernan Stockebrand, showcases the pristine skies at the Cerro Tololo Inter-American Observatory (CTIO). CTIO, a program of NSF’s NOIRLab, is a complex of astronomical telescopes and instruments in the Chilean Andes. CTIO’s mountainous surroundings and altitude — the site is 2200 meters (7200 feet) above sea level — ensure the mountaintop observatory enjoys spectacular night skies. This colorful panorama shows the arch of the Milky Way hanging above the observatory facilities, as well as strands of low clouds illuminated by the Moon, which is visible on the right side of the image. At the center of this image is the Víctor M. Blanco 4-meter Telescope, with the SMARTS 1.5-meter Telescope to the right and the SMARTS 0.9-meter Telescope at far right. To the left of the Víctor M. Blanco Telescope is the 0.9-meter Curtis Schmidt Telescope and the ...

27 November 2019: Transit image with a twist (and a turn!) About 13 times per century, fleeting Mercury can be seen passing directly in front of the Sun in what is called a transit. The most recent Mercury transit occurred on 11 November 11, 2019. Teams on Cerro Tololo Inter-American Observatory (CTIO) and Kitt Peak National Observatory (KPNO) developed observing plans in an effort to recreate an experiment to calculate the Earth-Sun distance. CTIO’s Daniel Munizaga obtained this image of the transit with a 6-inch Celestron Nexstar telescope and a Nikon D750 camera by taking images every five minutes. While the path of Mercury across the Sun in fact traced a straight line, in this image the path appears to loop backwards due to an effect called field rotation as the telescope and camera track across the sky. Juan Seguel also imaged the transit of Mercury from CTIO, accompanied by students from the ...

20 November 2019: International Gemini Observatory follows a comet from beyond: NOIRLab’s International Gemini Observatory continues tracking a visiting comet from beyond our Solar System. Gemini’s second image release of the comet, discovered by Russian amateur astronomer Gennady Borisov in August of this year, reveals the evolution of the comet as it approaches its closest approach to our sun in December. The image also features the distant background galaxy (going by the catchy designation: 2dFGRS TGN363Z174) that happened to appear adjacent to the comet when the image was captured on the night of November 11–12 2019. “The comet is doing what we would expect a comet to do as it approaches the Sun,” according to Meg Schwamb of Queen’s University Belfast who led the observations. “Gas is being vaporized and the gas cloud, or coma, is expanding and being blown away from the Sun. It’s reassuring that comets from beyond our Solar System ...

13 November 2019: Earlier this week, while observing with DECam on the Víctor M. Blanco 4-meter Telescope at the Cerro Tololo Inter-American Observatory (CTIO), a Program of NSF's NOIRLab, astronomers Clara Martínez-Vázquez and Cliff Johnson noticed something interesting. One of their images, the 333 seconds-exposure seen here, contained at least 19 streaks that they quickly surmised were due to the second batch of Starlink satellites launched last week. The gaps in the satellite tracks are due to the gaps between the DECam CCD chips in the 2.2-degree field. At the same time, the CTIO all-sky camera recorded the satellites which were even visible with the unaided eye. Several frames from that camera can be seen in this timelapse video from CTIO. Links Gemini North Cloud Camera timelapse video of the passage of the Starlink satellite cluster over Maunakea. This sequence was obtained on the night of 12-13 November. CTIO all-sky camera