Title: G53.4+0.05 - a new Galactic supernova remnant discovered with LOFAR Author: Laura N. Driessen, Vladimír Domek, Jacco Vink, Maria Arias, Jason W. T. Hessels, Joseph D. Gelfand We present the serendipitous discovery of a new supernova remnant, G53.4+0.05, in deep targeted LOw Frequency AR...
Title: The planetary nebula IC 4776 and its post-common-envelope binary central star Author: Paulina Sowicka, David Jones, Romano L. M. Corradi, Roger Wesson, Jorge García-Rojas, Miguel Santander-García, Henri M. J. Boffin, Pablo Rodríguez-Gil We present a detailed analysis of IC 4776, a pla...
Arctic crossing planned for 'Boaty' sub The UK's favourite new yellow submarine, Boaty McBoatface, is in training for a grand challenge. Scientists plan to send the long-range autonomous vehicle under the sea-ice of the Arctic - from one side of the ocean basin to the other. Read more
Astronomers Detect Orbital Motion in Pair of Supermassive Black Holes Using the supersharp radio "vision" of the National Science Foundation's Very Long Baseline Array (VLBA), astronomers have made the first detection of orbital motion in a pair of supermassive black holes in a galaxy some 750 m...
Orbital elements:
2015 ER61 PHA, Earth MOID = 0.0140 AU
Epoch 2015 Mar. 19.0 TT = JDT 2457100.5 MPC
M 359.06688 (2000.0) P Q
n 0.00115781 Peri. 86.65541 +0.70031952 +0.70864328
a 89.8207997 Node 228.19643 -0.69212183 +0.64464169
e 0.9933428 Incl. 6.61648 -0.17469955 +0.28681319
P 851 H 1...
Bolide 30 May: it was a mini-asteroid A mini-asteroid produced the bright meteor sighted on 30 May over Italian skies. Scientists at the Prisma collaboration, promoted and coordinated by INAF, they have estimated the drop zone of possible meteorites in the territory between Padua and Venice Read...
Title: Nitrogen abundances in giant stars of the globular cluster NGC 6752 Authors: David Yong (1), Frank Grundahl (2), Jennifer A. Johnson (3), Martin Asplund (4) ((1) RSAA, Mt Stromlo Observatory, (2) Univ. of Aarhus, (3) Ohio State University, (4) MPA Garching) We present N abu...
Title: A 1.05 Solar Mass Companion to PSR J2222-0137: The Coolest Known White Dwarf? Author: David L. Kaplan, Jason Boyles, Bart H. Dunlap, Shriharsh P. Tendulkar, Adam T. Deller, Scott M. Ransom, Maura A. McLaughlin, Duncan R. Lorimer The recycled pulsar PSR J2222-0137 is one of the closest known...
On February 23, 1987, observers saw a star explode in the Large Magellanic Cloud, (a nearby dwarf galaxy).
At about 169000 light years away, it was the closest seen in the past 300 years; and astronomers have continu... < 1.6 x 10^{-14} ergs/s/cm^2 in the wavelength range 2900-9650 Angstroms for any continuum emitter at the centre of the supernova remnant (SNR). It is likely that the SNR contains opaque dust that absorbs UV and optical emission, resulting in an attenuation of ~35% due to dust absorption in the SNR. Taking into account dust absorption in the remnant, we find a limit of L_opt < 8 x 10^{33} ergs/s. We compare this upper bound with empirical evidence from point sources in other supernova remnants, and with theoretical models for possible compact sources. Bright young pulsars such as Kes 75 or the Crab pulsar are excluded by optical and X-ray limits on SN 1987A. Of the young pulsars known to be associated with SNRs, those with ages < 5000 years are all too bright in X-rays to be compatible with the limits on SN 1987A. Examining theoretical models for accretion onto a compact object, we find that spherical accretion onto a neutron star is firmly ruled out, and that spherical accretion onto a black hole is possible only if there is a larger amount of dust absorption in the remnant than predicted. In the case of thin-disk accretion, our flux limit requires a small disk, no larger than 10^{10} cm, with an accretion rate no more than 0.3 times the Eddington accretion rate. Possible ways to hide a surviving compact object include the removal of all surrounding material at early times by a photon-driven wind, a small accretion disk, or very high levels of dust absorption in the remnant.
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Photo of the Large Magellanic Cloud and supernova
The 12 - 27 metre wide asteroid 2017 MA3 in the constellation Cygnus will make a close pass (3.23 LD, 0.00829 AU) travelling at 9.28 km/second, to the Earth-Moon system on the 27th June 2017 @ 07:37 UT ±00:01. Magnitude: 18.6 V See more The Lunar Distance (LD), the distance between Earth and the Moon, e...
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