“Gaia promises to build on the legacy of ESA’s first star-mapping mission, Hipparcos, launched in 1989, to reveal the history of the galaxy in which we live,” says Jean-Jacques Dordain, ESA’s Director General.
- ESA
Sunday, 9 March 2014
ESA's Gaia Mission Launches to Map the Milky Way
Scientists detect extraterrestrial neutrinos (Down South)
Buried deep in the pristine Antarctic ice lie 5,160 basketball-sized detectors that look for flashes of blue light.
This radiation signals that a high-energy particle has interacted with an atom of the ice and given off some energy in the process. Scientists built the underground cubic kilometer IceCube detector to find a specific type of particle called a neutrino. This particle has no electric charge, is nearly massless, and interacts extremely weakly with matter. (In fact, billions of them are zooming through you as you read this story.)
Astronomers have detected neutrinos from the Sun and from Supernova 1987A when a massive star exploded. Now, the IceCube team reports in the November 22 issue of Science that it has found 28 high-energy neutrinos during a two-year all-sky search. The newly discovered particles have energies at least a million times that of the SN 1987A neutrinos.
At most, 11 of the 28 detected signals could result from background events or atmospheric neutrinos — those created as high-energy particles called cosmic rays collide with atoms and molecules in Earth’s atmosphere and create secondary particles. However, the researchers say the neutrinos don’t have the characteristics of atmospheric ones.
They looked in the data for evidence of multiple neutrinos originating from a specific location on the sky or arriving at a similar time but were unable to trace the 28 neutrinos to specific sources. Most of the detected signals correspond to locations on the Southern Hemisphere sky.
Scientists can calculate the energies of the incoming neutrinos from the light the detectors register. The 28 particles discussed in the Science study had energies ranging from 30 trillion electron volts (TeV) to 1,141 TeV; visible light has energy between 1.5 and 3 electron volts. The data also include the two highestenergy neutrinos ever observed. — L. K.
Source: Astronomy March 2014
Mark Kelly, twin brother enlisted for NASA study
This undated photo provided by NASA, astronauts Mark Kelly, right, STS-124 commander, and Scott Kelly are pictured in the check-out facility at Ellington Field near NASA's Johnson Space Center in Houston. NASA announced Friday, March 7, 2014, that Mark Kelly and astronaut Scott Kelly will participate in 10 different investigations. Craig Kundrot, deputy chief scientist of NASA's Human Research Program, says in a news release that the brothers provide a unique opportunity to study two people with the same genetics who were in different environments. Officials say Scott Kelly spent a year in space while Mark Kelly was on Earth. NASA says it is hoping the studies can be the basis for future research initiatives. (AP Photo/NASA)
Monday, 3 February 2014
Saturday, 25 January 2014
Klubbyeenkoms: ASSA Bloemfontein - 1 Februarie 2014
Die Bloemfonteinse Amateur Sterrekunde Vereniging (ASSA Bloemfontein) hou op Saterdag 1 Februarie sy eerste byeenkoms van die jaar. Voornemende amateur sterrekundiges is welkom om die geleentheid by te woon.
Op die program is onder meer:
- Die gebruik van 'n teleskoop insluitende die eienskappe van verskillende oogstukke;
- Wat kan gesien word in die nagruim in verskillende ligomstandighede (Limiting Magnitude);
- Ons kyk ook na `n nova wat onlangs uitgebars het en met `n verkyker sigbaar is;
- As die weer saamspeel soek ons die Perdekopneuwel in Orion.
Koste: Gratis vir lede en R50 per persoon vir besoekers. Die bedrag word terugbetaal as jy by die vereniging aansluit. Ledegeld is R100 per jaar vir `n gesin.
- Stuur e-pos aan assabfn@gmail.com om vir die geleentheid te bespreek.
Tyd: 18:30 (Ons braai, so bring jou eie kosmandjie met vleis, eetgoed, eetgerei en koeldrank. Braaivuur en roosters is beskikbaar.)
Plek: Boyden-sterrewag (Langs Maselspoort)
Sunday, 8 December 2013
Naked Eye Nova Centauri 2013 - Astronomy Picture of the Day
Source: Astronomy Picture of the Day
Naked Eye Nova Centauri 2013
Image Credit & Copyright: Yuri Beletsky (Las Campanas Observatory, Carnegie Institution)
Explanation: Brightest stellar beacons of the constellation Centaurus, Alpha and Beta Centauri are easy to spot from the southern hemisphere. For now, so is new naked eye Nova Centauri 2013. In this night skyscape recorded near Las Campanas Observatory in the Chilean southern Atacama desert on December 5, the new star joins the old in the expansive constellation, seen at early morning hours through a greenish airglow. Caught by nova hunter John Seach from Australia on December 2 as it approached near naked eye brightness, Nova Cen 2013 has been spectroscopically identified as a classical nova, an interacting binary star system composed of a dense, hot white dwarf and cool, giant companion. Material from the companion star builds up as it falls onto the white dwarf's surface triggering a thermonuclear event. The cataclysmic blast results in a drastic increase in brightness and an expanding shell of debris. The stars are not destroyed, though. Classical novae are thought to recur when the flow of material onto the white dwarf eventually resumes and produces another outburst.
Monday, 4 November 2013
1% Solar Eclipse in Bloemfontein, South Africa
Frans Human, member of the Bloemfontein Center of The Astronomical Society of Southern Africa took this image of the hybrid eclipse on Sunday, 3 November 2013. Some sunspots are also visible.
1% visible in Bloemfontein 3:51 - 4:35pm (Sunday - 3 November 2013)
Wednesday, 30 October 2013
Official Opening of the Naval Hill Digital Planetarium
Official Opening of the Naval Hill Digital Planetarium in Bloemfontein, South Africa
Live Streaming
Friday 1 November 201310:45 - 13:00
The University of the Free State (UFS) is implementing an innovative and exciting project, namely the establishment of a ‘Centre for Earth and Space’ on Naval Hill in the centre of Bloemfontein.
The
86-year old Lamont-Hussey Observatory on Naval Hill, also known as the
Sterrewag Theatre, is home to the planetarium. The planetarium is the
first component of a proposed Centre for Earth and Space.
Earth-sized 'lava world' discovered
A doomed "lava world" with a similar mass and density to that of Earth has been discovered orbiting a star 400 light-years away.
Observations suggest the planet, named Kepler 78b, is composed mostly of rock and iron, much like our own planet.
But its extremely close proximity to its host star - a hundredth of the distance between the Earth and the Sun - remains something of a puzzle.
Details of the work by two teams of researchers appear in Nature journal.
More...
Tuesday, 29 October 2013
Priceless to me - Letter from Sir Patrick Moore
Click to enlarge!
That was where I found the second hand book - Brilliant Stars written by Patrick Moore. And inside, with some newspaper clippings, was this letter, typed on that famous typewriter and signed by that legendary astronomer - Sir Patrick Moore.
A Mister DW Suchterlonie from Clarens wrote to Moore asking about the absolute and apparent magnitude of Sirius on page 13. He received the above letter from Moore.
In another book - Stars and Planets of the Southern Hemisphere (Lionel Warner) DW Suchterlonie wrote his name and also Planetarium, 3rd April 1982 in the front cover. Anyone from ASSA Johannesburg recognizing the name?
- Hannes Pieterse
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