So, did you miss yesterday’s occultation of Venus by the Moon? It was a tough one, to be sure, as the footpath for the event crossed Europe and Asia in the daytime. Watch that Moon, though, as it crosses back into the evening sky later this week, and occults (passes in front of) the bright star Aldebaran for eastern North America and, for Hawaii-based observers, actually covers the brightest of the asteroids, 4 Vesta. Continue reading “Watch the Moon Occult Vesta and Aldebaran This Weekend”
A Challenging Daytime Occultation of Venus for Europe
Sometimes, the Universe seems bent on hiding the most glorious of events right in plain sight. Just a such an event occurs next week, when the slender waning crescent Moon occults the planet Venus for observers across Europe, the United Kingdom and northern Asia. Continue reading “A Challenging Daytime Occultation of Venus for Europe”
Teasing the Galactic Ghoul, Past and Present
Launch. It’s the part of spaceflight that is always the most fraught with peril, as your precious and delicate scientific package is encapsulated on top of tons of explosives, the fuze is lit, and the whole package hurls spaceward.
As noted by Bob King earlier last week on Universe Today, the European Space Agency’s ExoMars Trace Gas Orbiter underwent just such an ordeal on March 14th, as it broke the surly bonds atop a Russian Proton rocket from the Baikonur Cosmodrome, and headed towards the Red Planet with the Schiaparelli Lander affixed snug to its side. The spacecraft may have very nearly suffered a disaster that would’ve left it literally dead in space.
Don’t worry; the ExoMars Trace Gas Orbiter is OK and safely in a heliocentric orbit now, en route for an orbital insertion around the Red Planet on October 19th, 2016. But our robotic ambassadors haven’t always been so lucky.
The Road to the Red Planet
Launching for Mars is a complex odyssey. Unlike U.S. Mars missions such as MAVEN and Curiosity, which typically launch atop an Atlas V rocket and head directly into solar orbit after launch, Russian Proton rocket launches initially enter a looping elliptical orbit around the Earth, and require a series of successive engine burns to raise the payload’s orbit for a final injection headed to Mars.
All was well as the upper stages did their job, four burns were performed, and the ExoMars Trace Gas Orbiter phoned home indicating it was in good health afterwards.
It’s what happened next that gave planners a start, and is still the source of a minor controversy.
While Russian sources tracked the Briz-M upper stage and say it worked as planned, observatories based in the southern hemisphere imaged the departure of ExoMars noted about half a dozen fragments following it. Having done its job, the Briz-M stage was to execute a maneuver after separation, placing it into a ‘graveyard’ solar orbit. Not only would this clear ExoMars on its trajectory, but the Red Planet itself.
Anatoly Zak notes in a recent article for Popular Mechanics online that the Briz-M upper stage isn’t subjected to strict sterilization measures, though its unclear if it too will reach Mars.
Solar orbit is littered with discarded boosters and spacecraft, going all the way back to the first mission to fly past the Moon and image the lunar farside, the Soviet Union’s Luna 3 in 1959. Some of these even come back on occasion to revisit the Earth as temporary moonlets, such as the Apollo 12 booster in 2002 and the Chang’e-2 booster in 2013.
And there is nothing more that the fabled ‘Galactic Ghoul’ loves than tasty Mars-bound spacecraft. Though the ExoMars Trace Gas Orbiter is in its expected trajectory to Mars as planned, it seems that the the Briz-M upper stage may have exploded seconds after spacecraft separation.
The incident is eerily similar to the fate that befell the Phobos-Grunt sample return mission. Also launched from Baikonur, the spacecraft was stranded in Earth orbit after its Fregat upper stage failed to do its job. Phobos-Grunt reentered on January 15th, 2012 just over two months after launch, taking its container of Planetary Society-funded tardigrades scheduled to make the round trip to Mars permanently to the bottom of the Pacific Ocean instead.
The Mars 96 mission also failed to leave Earth orbit, and reentered over South America on November 16th, 1996 with a radioactive payload meant for power surface penetrators bound for the Red Planet.
The Russians haven’t had good luck with Mars landers, though they fared better landing on Venus with their Venera program… and had at least one spare Venusian Death Probe crash on Earth and fight the Six Million Dollar Man back in the 1970’s TV show, to boot.
The U.S. has actually had pretty good luck on Mars, having only lost the Mars Polar Lander for seven successful landing attempts. If successful later this year, Schiaparelli will be a first landing on Mars for any other space agency other than NASA.
And you’ll be able to explore Mars for yourself shortly, as opposition season for the Red Planet is right around the corner. Opposition for 2016 occurs on May 22nd, and we’re in for a cycle of favorable oppositions leading up to one in 2018 that’s very nearly as favorable as the historic 2003 opposition.
Space is hard, but the ExoMars Trace Gas Orbiter seems to be made of still harder stuff, the likes of which no explosion in space can kill.
Onward to Mars!
A Penumbral Lunar Eclipse Leads the Way to Easter Weekend
Ready for Easter? The first of two lunar eclipses for 2016 occurs this week, though it’s an event so subtle, you might not notice it at first glance. We’re talking about Wednesday evening’s (morning for North America) penumbral lunar eclipse. If a total solar eclipse such as the one that crossed Indonesia and the Pacific Ocean earlier this month is the ultimate astronomical experience, then a penumbral lunar eclipse is at the other end of the spectrum, a ghostly shading on the Moon that is barely noticeable. Continue reading “A Penumbral Lunar Eclipse Leads the Way to Easter Weekend”
Comet Craziness: 252P LINEAR Brightens, and a Close Pass for BA14 PanSTARRS
Ready for the next big ‘Comet of the Century?’ Yeah, us too. Cometary apparitions are the big unknown in backyard astronomy, an eternal uncertainty in the clockwork goings-on of the universe. Continue reading “Comet Craziness: 252P LINEAR Brightens, and a Close Pass for BA14 PanSTARRS”
Standing in the Shadow: Amazing Images of Today’s Total Solar Eclipse
The Moon’s shadow kissed the Earth earlier today, providing a fine show from southeast Asia, to the southern shores of Alaska. We wrote about the only total solar eclipse for 2016 yesterday. This is it, the last total solar eclipse prior to the return of totality for the contiguous United States on August 21st, 2017.
Cloud cover over the region was a toss up, with clear skies for some, and cloudy skies for others. Those towards the western end of the track where the eclipsed rising Sun sat low on the horizon seemed to have fared worst.
Update: Sometimes, the camera sees what the eye misses. The Malaysian team did indeed manage to nab a fine display of Bailey’s Beads in the moments leading up to totality through a thin gap in the clouds:
Skies dawned clear to the east over the Indonesian islands on the morning of the eclipse, and the joint NASA/Exploratorium webcast from the remote atoll of Woleai in Micronesia was a success.
Observing from a helipad Balikpanpan, Indonesia, veteran eclipse chaser Patrick Poitevin said: “What an eclipse! Vertically clear sky throughout the entire eclipse from our ‘private’ helipad in Balikpapan. Only slight haze now and then. Asymmetric corona, with bright and prominent snow white streamer. Venus, Mercury easily visible long before, and shadow bands post totality. Fabulous! All so pretty!!! Marked the second Saros 130 for Jo and the 3rd for me.”
Indeed, catching a ‘triple saros’ known as an exeligmos is a noteworthy lifetime accomplishment.
Many witnessed the eclipse via Slooh’s live webcast from the path of totality, which is now archived in its entirety on YouTube.
As of writing this, no views from space have surfaced, though we suspect this will change as the day goes on. Word is that the Alaskan Airlines flight that modified their flight plan to catch the eclipse was successful as well. Check back, as we’ll be dropping in more images as they trickle in from the field throughout the day.
Update: Scratch that… Japan’s Himawari-8 weather satellite did indeed nab views of the umbra of the Moon as it raced across the Pacific:
Though the eclipse was almost entirely over water after the umbra departed SE Asia, regions around the path were treated to a fine partial eclipse, including residents of Hawaii:
#Eclipse success! Clouds filtered but didn’t ruin the view. Check out 12 yr old’s notes! #Kona, #BigIsland #Hawaii pic.twitter.com/MtJ300o4Ka
— Kona Skies (@KonaSkies) March 9, 2016
August 21st 2017 is now the very next total solar eclipse in the queue!
Update: and the amazing images just keep on coming… here’s an amazing image and time lapse video courtesy of astrophotographer Justin Ng:
And timelapse:
2016 Total Solar Eclipse – Palu Indonesia from Justin Ng Photo on Vimeo.
Wow. just wow!
Chasing the Shadow: Our Guide to the March 9th Total Solar Eclipse
Ready for the ultimate in astronomical events? On the morning of Wednesday, March 9th, the Moon eclipses the Sun for viewers across southeast Asia.
Many intrepid umbraphiles are already in position for the spectacle. The event is the only total solar eclipse of 2016, and the penultimate total solar eclipse prior the ‘Big One’ crossing the continental United States on August 21st, 2017.
Tales of the Saros
This particular eclipse is member 52 of 73 eclipses in saros cycle 130, which runs from 1096 AD to 2394. If you saw the total solar eclipse which crossed South America on February 26th, 1998, then you caught the last solar eclipse from the same cycle.
Weather prospects are dicey along the eclipse track, as March is typically the middle of monsoon season for southeast Asia. Most eclipse chasers have headed to the islands of Indonesia or cruises based nearby to witness the event. The point of greatest eclipse lies off of the southeastern coast of the Philippine Islands in the South China Sea, with a duration of 4 minutes and 10 seconds. Most observers, however, will experience a substantially shorter period of totality. For example, totality lasts only 2 minutes and 35 seconds over island of Ternate, where many eclipse chasers have gathered. The Sun will be 48 degrees above the horizon from the island during totality.
A great place to check cloud cover and weather prospects along the eclipse track is the Eclipsophile website.
The umbra of the Earth’s Moon will sweep across Sumatra at sunrise and across the island of Borneo, to landfall one last time for Indonesia over the island of North Maluku before sweeping across the central Pacific. This eclipse is unusual in that it makes landfall over a very few countries: the island nation of Indonesia, and just a few scattered atolls in Palau and Micronesia.
Partial phases of the eclipse are also visible from India at sunrise, across northeast Asia along the northernmost track, to central Australia in the south, and finally, to southern Alaskan coast at sunset. Honolulu Hawaii sees a 65% partial solar eclipse in the late afternoon on March 8th.
Expect great views, both from Earth and from space. We typically get images from solar observing spacecraft, to include the joint NASA/JAXA Hinode mission, and the European Space Agency’s PROBA-2 spacecraft. Both are in low-Earth orbit, and see a given eclipse as a swift, fleeting event. Other solar observatories—such as the Solar Heliospheric Observatory and the Solar Dynamics Observatory—occupy a different vantage point in space, and miss the eclipse.
As of this writing, we know of several folks that have made the journey to stand in the path of totality, to include Sharin Ahmad (@Shagazer), Michael Zeiler (@GreatAmericanEclipse) and Justin Ng.
Good luck and clear skies to all observers out there, awaiting darkness in the path of totality.
Live in the wrong hemisphere? There are several live webcasts planned from the eclipse zone:
NASA and the National Science Foundation are working with a team from San Francisco’s Exploratorium to bring a live webcast of the eclipse from the remote atoll island of Woleai, Micronesia. The feed starts at 7:00 EST/0:00 Universal Time (UT) and runs for just over three hours. You can follow the exploits of the team leading up to show time here.
The venerable Slooh will also feature a webcast of the eclipse with astronomer Paul Cox from Indonesia running for three hours starting at 6:00 PM EST/23:00 UT.
A view of the partial phases of the eclipse from the Hong Kong science center also starts at 5:30 PM EST/22:30 UT:
Don’t forget: though the eclipse occurs on the morning of March 9th local time in southeast Asia, the path crosses the International Dateline, and the webcasts kick off on the evening of Tuesday March 8th for North America.
And hey, Alaska Airlines flight 870 from Anchorage to Honolulu will divert from its flight plan slightly… just to briefly intercept the Moon’s shadow (its already a fully booked flight!)
From there, 2016 features only two faint penumbral lunar eclipses on March 23rd and September 16th, and an annular solar eclipse crossing central Africa on September 1st.
We’ll be doing a post-eclipse round up, with tales from totality and the pics to prove it… stay tuned!
Got eclipse pictures to share? Send ’em to Universe Today… we just might feature them in our round up!
Don’t miss our eclipse-fueled science fiction tales: Exeligmos and Shadowfall.
By Jove: Our 2016 Guide to Jupiter at Opposition
Ready to explore the largest planet in our solar system? The month of March heralds the return of Jupiter to evening skies. Early March 2016 sees the planet Jupiter starting off the month less than one degree from the star Sigma Leonis. Continue reading “By Jove: Our 2016 Guide to Jupiter at Opposition”
The Future of Gravitational Wave Astronomy: Pulsar Webs, Space Interferometers and Everything
It’s the hot new field in modern astronomy. The recent announcement of the direct detection of gravitational waves by the Laser Interferometer Gravitational-wave Observatory (LIGO) ushers in a new era of observational astronomy that is completely off the electromagnetic spectrum. This detection occurred on September 14th, 2015 and later earned itself the name GW150914. This occurred shortly after Advanced LIGO turned on in early September, a great sign concerning the veracity of the equipment. Continue reading “The Future of Gravitational Wave Astronomy: Pulsar Webs, Space Interferometers and Everything”
Double Shadow Transit Season for the Jovian Moons Begins
Watching the inky-black shadow of a Jovian moon slide across the cloud-tops of Jupiter is an unforgettable sight. Two is always better than one, and as the largest planet in our solar system heads towards opposition on March 8th, so begins the first of two seasons of double shadow transits for 2016. Continue reading “Double Shadow Transit Season for the Jovian Moons Begins”