Welcome to Sott.net
Mon, 18 Feb 2019
The World for People who Think

Comets


Fireball 2

Meteor fireball caught on doorbell camera in Anchorage

Meteor of Doorbell Camera
© KTUU
Anchorage - An Anchorage man's doorbell camera captured what appears to be a meteor streaking across the sky Wednesday morning.

Kip Minnery, who lives in Turnagain, says he wishes he could have seen the event live himself, but thought it was cool that his security camera caught it as it happened.

A number of southcentral residents reported on social media seeing a bright light move across the sky Wednesday morning. People from Anchorage to Big Lake and Palmer reported seeing either a blue or green-looking light.

Comet 2

Comet Iwamoto fast approaching Earth

Comet C/2018 Y1 (Iwamoto)
© Emilio Lepeley
Emilio Lepeley in Elqui Valley, Vicuna, Chile, caught comet C/2018 Y1 (Iwamoto) – the green fuzzball at bottom center – on February 3, 2019, in the same field of view as the famous Sombrero Galaxy. Thank you, Emilio!
A new celestial visitor - a comet - was discovered by Japanese astronomer Masayuki Iwamoto in late 2018. It'll provide nice opportunities for astrophotographers, as it will pass close to a couple of Messier objects in February 2019. It's a fast-moving comet that will be closest to Earth on February 12, 2019, at around 2:57 p.m. ET (19:57 UTC; translate to your time zone). The celestial visitor will safely pass by Earth at some 28 million miles (45 million km). The comet has been designated C/2018 Y1 (Iwamoto).

This comet is fast! Comet C/2018 Y1 (Iwamoto) is traveling through space at the amazing speed of 147,948 miles per hour (238,099 km/h) or 66 km per second, relative to Earth.

The best nights for observing the comet (with binoculars and small telescopes) should be on February 11 and 12. Preliminary estimates suggest the newly found comet might reach a brightness or magnitude between 7 and 7.8 , which means it should be easily seen with small telescopes and binoculars. It will not be visible to the eye alone.

Comet 2

Oumuamua a debris of disintegrated interstellar comet says latest study

Oumuamua
© Universe Today
Since it was first detected hurling through our Solar System, the interstellar object known as 'Oumuamua has been a source of immense scientific interest. Aside from being extrasolar in origin, the fact that it has managed to defy classification time and again has led to some pretty interesting theories. While some have suggested that it is a comet or an asteroid, there has even been the suggestion that it might be an interstellar spacecraft.

However, a recent study may offer a synthesis to all the conflicting data and finally reveal the true nature of 'Oumuamua. The study comes from famed astronomer Dr. Zdenek Sekanina of the NASA Jet Propulsion Laboratory, who suggests that 'Oumuamua is the remnant of an interstellar comet that shattered before making its closest pass to the Sun (perihelion), leaving behind a cigar-shaped rocky fragment.

Having worked with the JPL for almost 40 years - where he specializes in the study of meteors, comets and interstellar dust - Dr. Sekanina is no stranger to celestial objects. In fact, his work includes groundbreaking studies on Halley's comet, the Tunguska event, and the break-up and impact of Comet Shoemaker-Levy 9 on Jupiter.

His latest study, titled "1I/'Oumuamua As Debris of Dwarf Interstellar Comet That Disintegrated Before Perihelion", recently appeared online. In it, Sekanina addresses the possibility that the observations that began in October of 2017 by the Panoramic Survey Telescope and Rapid Response System-1 (Pan-STARRS-1) was actually a fragment of the original object that entered our system in early 2017.

Comet 2

Earth may be in the middle of a giant asteroid spike

Impact Craters on the Moon
© Dr. A Parker/Southwest Research Institute
Impact craters on the moon reveal that the number of asteroid impacts increased dramatically over the last 300 million years. Here, a map of all the impact craters larger than 6 miles (10 kilometers) in diameter and younger than 1 billion years old.
Like a motorcycle windshield splattering bugs on the highway, Earth's atmosphere is constantly deflecting tiny bits of extraterrestrial rock, dust and other space garbage that get in the way of our planet's 67,000-mph (107,000 km/h) joyride. Occasionally, that debris breaks through - as it did 66 million years ago, when an asteroid the size of Manhattan crashed into the Gulf of Mexico and killed the dinosaurs.

That impact was singularly catastrophic. But, according to a new study published today (Jan. 17) in the journal Science, that smashup was also just one episode in an ongoing spike of gargantuan asteroid impacts bombarding our neck of the solar system. After studying 1 billion years of asteroid craters on the Earth and moon, the study's authors found that the rate of huge asteroid impacts on Earth has nearly tripled in the past 290 million years - and nobody's sure why.

"It's perhaps fair to say it was a date with destiny for the dinosaurs," study co-author Thomas Gernon, associate professor of Earth science at the University of Southampton in the U.K., said in a statement. "Their downfall was somewhat inevitable given the surge of large space rocks colliding with Earth."

Comet 2

Oumuamua data reveals intriguing possibilities

Oumuamua
© M. Kornmesser/European Southern Observatory
Today, physicist Eugene Bagashov concludes his remarkable three-part analysis of Oumuamua, the mysterious object which is thought to be our solar system's first interstellar traveler. In previous episodes, Eugene has explored several enigmas, including the puzzle of the object's mysterious acceleration as it moved away from the Sun. While this episode was in production, Eugene made a stunning discovery that may provide an essential pathway to understanding Oumuamua's trajectory. As Eugene explains, this discovery relates directly to measurements of the interstellar magnetic field.

Info

Greenland Crater - The 12,000 year old comet that erased ancient civilization

Ancient Impact
© ScreenCapture/YouTube
NASA recently discovered of a massive, 19-mile (31km) wide crater, found hidden underneath Greenland's Hiawatha Glacier. This crater is the result of an asteroid impact, from a nearly 1 mile-wide mountain of iron, weighing somewhere around, get this, 11-12 BILLION tons, and was traveling at approximately 12 MILES per second - which is equivalent to more than 43,000 miles per hour - when it slammed into the earth some 12,000 years ago - And...with the mind-boggling force of essentially a 700-megaton bomb. And without a doubt, THIS is the reason why there is so much mystery and why we know so little about lost Ancient human civilization

Meteor

Earth enters densest stream of deadly Taurid meteor cluster this June

asteroid Bennu
© (NASA/Goddard/University of Arizona/AP) By Joel Achenbach December 25
This mosaic image collected on Dec. 2 and provided by NASA shows the asteroid Bennu, which is being studied by the NASA probe Osiris-REx. Bennu regularly crosses Earth's orbit and will pass close to our planet in about 150 years.
Incoming! A June meteor swarm could be loaded with surprises. Scientists studying a mysterious event over Siberia in 1908 call for a special observation campaign next summer.

On June 30, 1908, an object the size of an apartment building came hurtling out of the sky and exploded in the atmosphere above Siberia. The Tunguska event, named for a river, flattened trees for 800 square miles. It occurred in one of the least-populated places in Asia, and no one was killed or injured. But the Tunguska airburst stands as the most powerful impact event in recorded human history, and it remains enigmatic, as scientists don't know the origin of the object or whether it was an asteroid or a comet.

One hypothesis: It was a Beta Taurid.

The Taurids are meteor showers that occur twice a year, in late June and late October or early November. The June meteors are the Betas. They strike during the day, when sunlight washes out the "shooting stars" that are visible during the nighttime meteor shower later in the year.

Comment: Scientists should be held accountable for propagating such ignorance and wishful thinking. The threat of cyclical cometary catastrophes is very real, it has been well documented by peoples throughout history and it is clearly evident in the archaeological record: And to hear what the historical records have to say on the matter, check out SOTT radio's: Behind the Headlines: Who was Jesus? Examining the evidence that Christ may in fact have been Caesar!


Comet 2

New Comet C/2018 Y1 (Iwamoto)

CBET 4588 & MPEC 2018-Y52, issued on 2018, Dec. 20, announce the discovery of a comet (magnitude ~12) by M. Iwamoto (MPC code 872) in images taken on 2018 Dec 18.8. The new comet has been designated C/2018 Y1 (Iwamoto).

I performed follow-up measurements of this object, while it was still on the PCCP webpage. Stacking of 5 unfiltered exposures, 20 seconds each, obtained remotely on 2018, December 20.5 from H06 (T20 - iTelescope network) through a 0.1-m f/5.0 astrograph + CCD, shows that this object is a comet with a diffuse coma about 1.5 arcmin in diameter and sharp central condensation.

My confirmation image (click on it for a bigger version)
Comet C/2018 Y1 (Iwamoto)
© Remanzacco Blogspot
MPEC 2018-Y52 assigns the following preliminary parabolic orbital elements to comet C/2018 Y1: T 2019 Jan. 27.16; e= 1.0; Peri. = 354.05; q = 1.14; Incl.= 160.69

Fireball 2

Geminid fireball filmed buzzing comet Wirtanen

comet wirtanen fireball
© Joe Lawton
The radiant of the Geminid meteor shower is not very far from approaching Comet 46P/Wirtanen. Their respective constellations, Gemini and Taurus, are next door neighbors. That means comet photographers can expect to catch some Geminids in their exposures. Indeed, that's exactly what happened to Joe Lawton of Gerald, Missouri, on Dec. 9th. "As I was photographing 46P/Wirtanen, a Geminid meteor blazed across the sky and disintegrated next to the comet!"

"I combined a series of still images to create this video," he explains. "You can see smokey debris from the Geminid meteoroid twisting in the winds of the upper atmosphere and ultimately dissipating."

How often is this happening? Just last night Harlan Thomas of Powderface Trail, Alberta, and Dr. Paolo Candy of the Cimini Astronomical Observatory in Italy also caught Geminids streaking past the comet.

Comment: With the arrival of the Geminids, and even a week or so before, fireball sightings, have risen rather dramatically:


Fireball 5

Video simulations show what would happen if asteroids crashed into Earth's oceans

Asteroid Impact Simulation
© YouTube/NCAR VisLab
In films like Armageddon, Hollywood has tried (and failed) to take on the question of what would happen if a comet or asteroid plunged into the oceans on Earth, but what has scientific research actually determined it may look like?

America's National Center for Atmospheric Research (NCAR) has posted a new video illustrating what could happen if an asteroid crashed into one of our oceans, and it's fascinating.

Based on data collected by Los Alamos National Laboratory scientists Galen R. Gisler and John M. Patchett, referred to as the Deep Water Impact Ensemble Data Set, these simulations show asteroids of various sizes entering the water from different angles. It's the scale and size of the aftermath that's the truly stunning part.