This artist’s impression shows the orbits of the objects in the HR 6819 triple system. This system is made up of an inner binary with one star (orbit in blue) and a newly discovered black hole (orbit in red), as well as a third star in a wider orbit (also in blue). Image Credit: ESO/L. Calçada

May 6 — A team of astronomers from the European Southern Observatory (ESO) and other institutes has discovered a black hole lying just 1,000 light-years from Earth. The black hole is closer to our Solar System than any other found to date and forms part of a triple system that can be seen with the naked eye. The team found evidence for the invisible object by tracking its two companion stars using the MPG/ESO 2.2-meter telescope at ESO’s La Silla Observatory in Chile. They say this system could just be the tip of the iceberg, as many more similar black holes could be found in the future.

“We were totally surprised when we realized that this is the first stellar system with a black hole that can be seen with the unaided eye,” says Petr Hadrava, Emeritus Scientist at the Academy of Sciences of the Czech Republic in Prague and co-author of the research. Located in the constellation of Telescopium, the system is so close to us that its stars can be viewed from the southern hemisphere on a dark, clear night without binoculars or a telescope. “This system contains the nearest black hole to Earth that we know of,” says ESO scientist Thomas Rivinius, who led the study published today in Astronomy & Astrophysics.

The team originally observed the system, called HR 6819, as part of a study of double-star systems. However, as they analyzed their observations, they were stunned when they revealed a third, previously undiscovered body in HR 6819: a black hole. The observations with the FEROS spectrograph on the MPG/ESO 2.2-meter telescope at La Silla showed that one of the two visible stars orbits an unseen object every 40 days, while the second star is at a large distance from this inner pair.

Dietrich Baade, Emeritus Astronomer at ESO in Garching and co-author of the study, says: “The observations needed to determine the period of 40 days had to be spread over several months. This was only possible thanks to ESO’s pioneering service-observing scheme under which observations are made by ESO staff on behalf of the scientists needing them.”

The hidden black hole in HR 6819 is one of the very first stellar-mass black holes found that do not interact violently with their environment and, therefore, appear truly black. But the team could spot its presence and calculate its mass by studying the orbit of the star in the inner pair. “An invisible object with a mass at least four times that of the Sun can only be a black hole,” concludes Rivinius, who is based in Chile.


This chart shows the location of the HR 6819 triple system, which includes the closest black hole to Earth, in the constellation of Telescopium. This map shows most of the stars visible to the unaided eye under good conditions and the system itself is marked with a red circle. While the black hole is invisible, the two stars in HR 6819 can be viewed from the southern hemisphere on a dark, clear night without binoculars or a telescope. Credit: ESO, IAU and Sky & Telescope

Astronomers have spotted only a couple of dozen black holes in our galaxy to date, nearly all of which strongly interact with their environment and make their presence known by releasing powerful X-rays in this interaction. But scientists estimate that, over the Milky Way’s lifetime, many more stars collapsed into black holes as they ended their lives. The discovery of a silent, invisible black hole in HR 6819 provides clues about where the many hidden black holes in the Milky Way might be. “There must be hundreds of millions of black holes out there, but we know about only very few. Knowing what to look for should put us in a better position to find them,” says Rivinius. Baade adds that finding a black hole in a triple system so close by indicates that we are seeing just “the tip of an exciting iceberg.”

Already, astronomers believe their discovery could shine some light on a second system. “We realized that another system, called LB-1, may also be such a triple, though we’d need more observations to say for sure,” says Marianne Heida, a postdoctoral fellow at ESO and co-author of the paper. “LB-1 is a bit further away from Earth but still pretty close in astronomical terms, so that means that probably many more of these systems exist. By finding and studying them we can learn a lot about the formation and evolution of those rare stars that begin their lives with more than about 8 times the mass of the Sun and end them in a supernova explosion that leaves behind a black hole.”

The discoveries of these triple systems with an inner pair and a distant star could also provide clues about the violent cosmic mergers that release gravitational waves powerful enough to be detected on Earth. Some astronomers believe that the mergers can happen in systems with a similar configuration to HR 6819 or LB-1, but where the inner pair is made up of two black holes or of a black hole and a neutron star. The distant outer object can gravitationally impact the inner pair in such a way that it triggers a merger and the release of gravitational waves. Although HR 6819 and LB-1 have only one black hole and no neutron stars, these systems could help scientists understand how stellar collisions can happen in triple star systems.

This image is one of the most photogenic examples of the many turbulent stellar nurseries the NASA/ESA Hubble Space Telescope has observed during its 30-year lifetime. The portrait features the giant nebula NGC 2014 and its neighbor NGC 2020 which together form part of a vast star-forming region in the Large Magellanic Cloud, a satellite galaxy of the Milky Way, approximately 163,000 light-years away.

The space inside Stephens Memorial Observatory’s dome has seen throngs of people over the years. Anyone who has visited on a busy Public Night knows it doesn’t take very many people to make a crowd around the big telescope. So to help protect public health with the novel coronavirus on the loose our Public Nights are cancelled, almost certainly for the remainder of 2020.

In place of public gatherings, we plan to produce a series of non-technical short video programs on various astronomy-related topics. The first program will be a look at several telescopes and how they work. Announcement of programs will be made via this website and Twitter.

Here’s a link to a video of observatory director James Guilford talking about the situation:

If you have suggestions for program topics, please write us using the Contact Us tab at the top of this page.

COVID-19 coronavirus - Image Credit: CDC I don’t need to tell you the sort of impact the spread of the novel coronavirus has had on plans for, well, just about everything this spring. Around now is when we at Stephens Memorial Observatory would be scheduling and opening to the public for monthly stargazing.

As we noted in a recent post here, a small observatory dome is no place to collect a group of people — a group of any size — when there is a pandemic disease circulating. If you’ve been to one of our Open Nights, you know it gets crowded and loud with not very many people present!

So early on we independently decided to postpone our public openings.

The novel coronavirus is “out there” and circulating. It is foolhardy to believe that after two weeks or so it will simply go away. With no vaccine available, the only true preventative is isolation. So that’s what we’re doing.

Remember this when you think about whether widespread closures are actually needed: The virus that causes COVID-19 appears to spread about as easily as the common cold. But this disease can be much more severe — sometimes deadly. A deadly disease that can be caught and spread as easily as a cold! That’s the reason for current shutdowns of bars, restaurants, and other businesses that bring people together. Think about that, please, as you go about your daily living.

I believe relative isolation will be advised for the general public for some months to come. I enjoy our public nights together under the dome but I don’t want anyone, myself included, to become ill because of our little gatherings. So there’s a very good chance Stephens will not open to the public any time this year.

In the meantime, I’m putting together technologies that will allow us to share either live or recorded live views of astronomical objects from a local telescope. We may also do some video presentations about the observatory and its telescope. I’ll keep you informed about future developments along those lines.

I’ll close here by thanking you for your interest in what we do, and thanking those who are repeat visitors to our humble observatory. Please help stop the spread of the COVID-19 virus and stay well. We’re all in this together and it will take sensible behavior from all of us to get out.


Best wishes and stay healthy,

James Guilford, Director and Janitor
Stephens Memorial Observatory

For trustworthy information about the novel coronavirus, and COVID-19 disease, visit the Ohio Department of Health website:

Well, it looks like we’ll not be opening our Public Nights season this month after all.

Outside of the usual concerns over wet and cloudy weather, and issues with our old building, now we have public health matters to take into consideration.

While the observatory is pretty much open to outside air when in use, people are quite close together under the dome — closer than public health experts recommend.

We’d rather everyone enjoy the night sky in good health and not have Stephens become a place where illness is spread; so we will watch and wait for resolution of the pandemic COVID-19 disease. When gatherings again make sense, we’ll announce and commence our season of Public Nights.

Until then, we’ll point out opportunities for home stargazing when clear nights occur and most of those suggestions come via our Twitter feed. You don’t need to have a Twitter account to see what’s going on, simple visit:

Through this all, we’ll fall back on the wisdom of The Hitchhiker’s Guide to the Galaxy upon which is written in large, friendly letters, “Don’t Panic”. No need to hoard toilet paper or bottled water. Just be smart about what you do to protect your health and the well-being of others. There’s plenty of good information available online if you choose wisely.

Here are a few good resources:

Ohio Department of Health

Ars Technica — Updated Daily

World Health Organization


Closed for the season

StephensAstro —  December 22, 2019 — Leave a comment
Photo: "Solstice Skies over Stephens" Photo by David Dreimiller.

“Solstice Skies over Stephens” Photo by David Dreimiller.

The winter months in Northeastern Ohio occasionally bring excellent conditions for astronomy; the season also brings the risk of deep snow, ice, frigid temperatures, and plenty of clouds. For the aforementioned reasons and more, Stephens Memorial Observatory is closed for the season. We thank everyone who attended our Open Night offerings in 2019 and hope to see you again in the new year, possibly in March. Until then, stay safe and warm, and keep looking up! Unless you’re under a bird. Then you might want to rethink.

Photo: The Orion Nebula by James Guilford, 2012

The Orion Nebula, Messier 42, as it may appear to viewers through small telescopes. Photo by James Guilford, 2012.

UPDATE: Over the course of the event 29 visitors enjoyed exquisite views of the Orion Nebula. Excellent seeing conditions allowed the nebular cloud to fill and extend beyond the telescope’s field of view at 104X magnification; possibly the finest view of that astronomical object that we have enjoyed. Also viewed was the red supergiant star, Betelgeuse, which is at the left shoulder of the constellation’s mythic figure. Betelgeuse has been the topic of discussion lately because the variable star has dimmed noticeably from its more typical brilliance.

Stephens Memorial Observatory of Hiram College will host a special Public Night Saturday, December 21, from 9:00 to 11:00 p.m. The Great Orion Nebula will be the featured object on a night billed as a “holiday gift.” The observatory is usually closed for the winter but organizers wished to offer views of the nebula this year. Clear skies will be especially important for this event.

Cloudy skies at the scheduled starting time cancel the event in which case, the observatory will not open. No reservations are required and there is no admission fee for observatory public nights.

The Observatory is located on Wakefield Road (Rt. 82) less than a quarter of a mile west of Route 700 in Hiram. There is no parking at the Observatory. Visitors may park on permissible side streets near the Post Office, a short distance east of the observatory.

Updates on programming are available via the Observatory’s Twitter feed: @StephensObs and on this website.

Photo: Asteroid/dwarf planet Hygiea. Credit: ESO/P. Vernazza et al./MISTRAL algorithm (ONERA/CNRS)

A new SPHERE/VLT image of Hygiea, which could be the Solar System’s smallest dwarf planet yet. As an object in the main asteroid belt, Hygiea satisfies right away three of the four requirements to be classified as a dwarf planet: it orbits around the Sun, it is not a moon and, unlike a planet, it has not cleared the neighborhood around its orbit. The final requirement is that it have enough mass that its own gravity pulls it into a roughly spherical shape. This is what VLT observations have now revealed about Hygiea. Credit: ESO/P. Vernazza et al./MISTRAL algorithm (ONERA/CNRS)

Astronomers using ESO’s SPHERE instrument at the Very Large Telescope (VLT) have revealed that the asteroid Hygiea could be classified as a dwarf planet. The object is the fourth largest in the asteroid belt after Ceres, Vesta and Pallas. For the first time, astronomers have observed Hygiea in sufficiently high resolution to study its surface and determine its shape and size. They found that Hygiea is spherical, potentially taking the crown from Ceres as the smallest dwarf planet in the Solar System.

As an object in the main asteroid belt, Hygiea satisfies right away three of the four requirements to be classified as a dwarf planet: it orbits around the Sun, it is not a moon and, unlike a planet, it has not cleared the neighborhood around its orbit. The final requirement is that it has enough mass for its own gravity to pull it into a roughly spherical shape. This is what VLT observations have now revealed about Hygiea.

“Thanks to the unique capability of the SPHERE instrument on the VLT, which is one of the most powerful imaging systems in the world, we could resolve Hygiea’s shape, which turns out to be nearly spherical,” says lead researcher Pierre Vernazza from the Laboratoire d’Astrophysique de Marseille in France. “Thanks to these images, Hygiea may be reclassified as a dwarf planet, so far the smallest in the Solar System.”

The team also used the SPHERE observations to constrain Hygiea’s size, putting its diameter at just over 430 km. Pluto, the most famous of dwarf planets, has a diameter close to 2,400 km, while Ceres is close to 950 km in size.

Surprisingly, the observations also revealed that Hygiea lacks the very large impact crater that scientists expected to see on its surface, the team report in the study published today in Nature Astronomy. Hygiea is the main member of one of the largest asteroid families, with close to 7,000 members that all originated from the same parent body. Astronomers expected the event that led to the formation of this numerous family to have left a large, deep mark on Hygiea.

“This result came as a real surprise as we were expecting the presence of a large impact basin, as is the case on Vesta,” says Vernazza. Although the astronomers observed Hygiea’s surface with a 95 percent coverage, they could only identify two unambiguous craters. “Neither of these two craters could have been caused by the impact that originated the Hygiea family of asteroids whose volume is comparable to that of a 100 km-sized object. They are too small,” explains study co-author Miroslav Brož of the Astronomical Institute of Charles University in Prague, Czech Republic.

The team decided to investigate further. Using numerical simulations, they deduced that Hygiea’s spherical shape and large family of asteroids are likely the result of a major head-on collision with a large projectile of diameter between 75 and 150 km. Their simulations show this violent impact, thought to have occurred about 2 billion years ago, completely shattered the parent body. Once the left-over pieces reassembled, they gave Hygiea its round shape and thousands of companion asteroids. “Such a collision between two large bodies in the asteroid belt is unique in the last 3–4 billion years,” says Pavel Ševeček, a PhD student at the Astronomical Institute of Charles University who also participated in the study.

Studying asteroids in detail has been possible thanks not only to advances in numerical computation, but also to more powerful telescopes. “Thanks to the VLT and the new generation adaptive-optics instrument SPHERE, we are now imaging main belt asteroids with unprecedented resolution, closing the gap between Earth-based and interplanetary mission observations,” Vernazza concludes.

Photo: First Quarter Moon, October 5, 2019.

Our First-Quarter Moon on International Observe the Moon Night, as seen through the Stephens telescope at 9:04 PM EDT. iPhone SE at eyepiece.


Our October 5 Open Night was the local event of the International Observe the Moon Night — an annual occurrence meant that encourages observation, appreciation, and understanding of our Moon and its connection to planetary science and exploration. Over the course of the night at Stephens Memorial Observatory some 34 enthusiastic and inquisitive visitors attended and were treated to beautiful and unusual views of Earth’s Moon and planet Saturn.

Unusual? The earliest visitors arrived just as the telescope was set to go … with the sky still bright with twilight. The Moon appeared light and against a power-blue sky background instead of the usual darkness of space. Saturn, invisible to the eye in the bright sky, was also viewed through the telescope in surprising detail.


Zooming in on the previous image: That dot in the center of dark-floored crater Alphonsus is its central peak. Over the course of two hours sun rose over that pinnacle making it brighter, and other features began to emerge as we watched. Alphonsus slightly overlaps the crater Ptolemaeus.

After darkness fell enthusiastic visitors took turns looking at a crater and watching a mountain peak become illuminated at sunrise on the Moon! It was a fine night appreciating a sight too often ignored: the wonder of Luna, our nearest neighbor in space.

Graphic: International Observe the Moon Night - 2019

Save the Date! International Observe the Moon Night will take place on October 5th 2019.

Stephens Memorial Observatory of Hiram College will host a Public Night Saturday, October 5, from 7:00 to 9:00 p.m. Earth’s Moon will be featured as our local participation in International Observe the Moon Night — a worldwide appreciation of Earth’s nearest neighbor in space. As an exciting bonus, planet Saturn will float near Moon in our skies and will also be observed. Other objects may also be viewed. Given good viewing conditions the Observatory’s 1901 vintage telescope delivers outstanding detail of the Moon and impressive views of Saturn with its distinctive rings.

An interesting activity any time of year is to make note of the daily changes we see in the phases of Moon. Open the PDF to print a handy guide and journal for lunar observation: Moon-Observation_Journal.

Cloudy skies at the scheduled starting time cancel the event in which case, the observatory will not open. No reservations are required and there is no admission fee for observatory public nights.

The Observatory is located on Wakefield Road (Rt. 82) less than a quarter of a mile west of Route 700 in Hiram. There is no parking at the Observatory. Visitors may park on permissible side streets near the Post Office, a short distance east of the observatory.

Updates on programming are available via the Observatory’s Twitter feed: @StephensObs or its website: