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Thu, 27 Jul 2017
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Astronomers detect space rock 3 days after it passes close to Earth

© Earth Sky
Artist’s concept of an asteroid passing near Earth.
A space rock now designated as asteroid 2017 OO1 was detected on July 23, 2017 from the ATLAS-MLO telescope at Mauna Loa, Hawaii. An analysis of its trajectory revealed it had been closest to Earth on July 20 sometime between 10:27 p.m. to 11:32 p.m. EDT (between 02:27 to 03:32 UTC on July 21).

This means the asteroid's closest approach occurred 2.5 to 3 days before it was seen. Asteroid 2017 OO1 flyby had passed at about one-third the Earth-moon distance, or about 76,448 miles (123,031 km).

Although that's still a safe distance, a fact that stands out is that asteroid 2017 OO1 is about three times as big as the house-sized asteroid that penetrated the skies over Chelyabinsk, Russia in February, 2013, breaking windows in six Russian cities and causing more that 1,000 people to seek treatment for injuries, mostly from flying glass.

Comet 2

New Comet: C/2017 O1

CBET nr. 4414, issued on 2017, July 24, announces the discovery of a comet (magnitude ~15.3) in the course of the "All-Sky Automated Survey for Supernovae" (ASASSN) program, from images taken with the 14-cm "Cassius" survey telescope at Cerro Tololo on July 19.32 UT. The new comet has been designated C/2017 O1.

I performed follow-up measurements of this object, while it was still on the neocp. Stacking of 10 unfiltered exposures, 60 seconds each, obtained remotely on 2017, July 23.7 from Q62 (iTelescope network) through 0.50-m f/6.8 astrograph + CCD + f/4.5 focal reducer, shows that this object is a comet with a sharp central condensation surrounded by diffuse coma about 3 arcmins in diameter.

My confirmation image (click on it for a bigger version)
© Remanzacco Blogspot
Below you can see the discovery image by ASASSN survey

Fireball 2

Meteor fireball observed over São Paulo, Brazil


YouTube/Exoss Citizen Science (screen capture)
On July 17th, just four days after rattling windows and shaking walls scare residents in the region of Campinas, another fireball is registered in the State of São Paulo by Exoss Citizen Science, a Brazilian meteor monitoring organization.


Fireball

'Long slow' meteor fireball seen over Hawley, Texas

© Kevin Palivec
Most of the time Meteors are quick zippy things! This morning over north central Texas we had a long slow lazy meteor. I caught this lazy fireball as it took over 4 seconds to blaze its way across the morning skies!


Fireball 2

Meteor rattles windows and scares residents in Campinas, Brazil

© EPTV
Photo of the Observatory of Campinas shows meteor trajectory in the sky
Noise and tremor scare residents of Hortolândia and Sumaré on Thursday night

The Municipal Observatory of Campinas (SP) caught the passage of a meteor in the region on Thursday night (July 13th). The cameras captured the moment when a luminous ball appears in the sky. See the meteor's trajectory in the video above. Residents reported feeling the shaking walls and windows and a loud noise.

Astronomer Júlio Lobo explains that "When a meteor falls and explodes, it causes a sonic boom, which usually shakes the walls and windows. [...] When this happens, it produces a meteorite, which is the 'pebble' that will stay on the ground. So if anyone happened to see a falling meteor, communicate us because this is of great scientific importance".

According to the astronomer, the Campinas observatory currently has six cameras, and this is the largest number of cameras in a Brazilian observatory. Many other meteors were recorded on Thursday night.

"We recorded 88 meteors on the same night. There is a network that studies this officially," said the astronomer.


Comment: It is well worth remembering what can come out of the sky, without any warning at all, like the Chelyabinsk meteor fireball.


Even NASA's own space data supports citizens' recent observations, namely the inconvenient fact that meteor fireballs are increasing dramatically.


Fireball

Loud boom over North Carolina caused by meteor fireball

© American Meteor Society
The American Meteor Society received about 50 reports about a fireball seen over the Southeast late Thursday night. This map shows places that reported seeing the fireball.
The American Meteor Society received about 50 reports about a fireball seen over the Southeast late Thursday night.

AMS said the fireball was seen shortly after 10 p.m. in North Carolina, South Carolina, Alabama, Tennessee, Georgia, Virginia and Kentucky and Tennessee.

Because there was nothing other than the fireball reported in the area at the time of the boom, speculation is that the boom was likely a meteor breaking up in the atmosphere.

Click here to see the AMS report.

Fireball 3

Meteor fireball explodes over South Australia (VIDEOS)

© facebook/Matthew Graziano (screen capture)
Six days after a suspected meteor shook Streaky Bay and very briefly lit up parts of South Australia's night sky, the event remains the talk of the town.

CCTV images of the spectacle show a bright light in the sky, lasting a couple of seconds, just before midnight on Friday, with locals reporting a thunder-like rumble a few minutes later.

Those lucky enough to have witnessed the event have described an "orange fireball" which could be seen from across the West Coast and Eyre Peninsula and as far afield as Elliston, Port Lincoln, Whyalla, Riverton and even Mount Barker, near Adelaide.


Comment: See also: Possible fast moving meteor fireball sighted over South Australia


Fireball

Glowing meteor fireball flies over the Mediterranean Sea

© YouTube/Meteors
This amazing fireball overflew the Mediterranean Sea on 4 July 2017 at 0:09 UT ( 2:09 local time). The event was produced by a sporadic meteoroid. The bolide began at an altitude of about 90 km above the sea level and ended at a height of around 50 km above the sea. The fireball was recorded in the framework of the SMART Project from the astronomical observatories of La Hita (Toledo, Spain), Calar Alto (Almería, Spain) and Sevilla (Spain).

This impressive fireball flew over the Mediterranean on July 4 at 2:09 am local time ( 0:09 UT). The event occurred by the entry into the terrestrial atmosphere of a sporadic meteoroid. The luminous phenomenon began at a height of about 90 km above sea level, and ended at an altitude of about 50 km.


Fireball 4

Possible fast moving meteor fireball sighted over South Australia

© Herald Sun, Australia
Meteor Shower Adorns Southern Lights Over Tasmania.
A bright "fast-moving" light with a green trail across the sky Friday night has captured the imaginations of at least a few locals who are this morning trying to get to the bottom of what it is they saw - or think they saw.

Advertiser.com.au has received and read a smattering of reports about the strange light, which one expert says could have been a meteor or space junk re-entering the earth's atmosphere.

A Reddit user reported seeing "what I can only guess was a meteor" pass over Henley Beach.

"Saw it from the city, fast moving bright light, green trail, bright flash."

Another Reddit user responded that the same phenomenon was witnessed by "a lot of people" on the Eyre Peninsula.

Salisbury East man Bradley Cousins said he was driving home from work in Tanunda around midnight when he looked up at the moon because it "looked strange".

Fireball 2

Meteor reported over Hunter Valley, New South Wales

There were reports overnight of a meteor spotted in the skies over the Hunter Valley about 9pm. Geoscience Australia also received reports of tremors at the time the meteor was spotted.

Residents recounted hearing something like a firecracker going off, or constant thunder. Similar descriptions were given by people from Cessnock all the way to Swansea.


Comment: The previous day in Perth, Western Australia, stargazers were left baffled after a 'red fireball' was spotted.