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Comet C/2013 A1 (Siding Spring) as seen with the Herschel Space Observatory
Marton, G.; Müller, T. G.; Kidger, M. +2 more
The thermal emission of comet C/2013 A1 (Siding Spring) was observed on March 31, 2013, at a heliocentric distance of 6.48 au using the PACS photometer camera of the Herschel Space Observatory. The comet was clearly active, showing a coma that could be traced to a distance of ~10'', i.e. ~50 000 km. Analysis of the radial intensity profiles of the…
Twisted Crab fingers revisited
Carlqvist, Per
Narrowband images of the Crab Nebula captured by the Hubble Space Telescope have earlier shown that the nebula does not only present a network of broad, bright filaments crossing the nebula but also numerous so-called fingers mostly pointing inwards. Using archival Hubble images we have in some detail studied the morphology of a great number of su…
Tentative insight into the multiplicity of the persistent dust maker WR 106 from X-ray observations
De Becker, M.
This paper presents the results of the analysis of the very first dedicated X-ray observation with XMM-Newton of WR 106. This carbon-rich WC9d Wolf-Rayet star belongs to the category of persistent dust makers (WCd stars). The issue of the multiplicity of these dust makers is pivotal to understand the dust formation process, and in this context X-r…
The Kinematics Parameters of the Galaxy Using Data of Modern Astrometric Catalogues
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +1 more
Based on the Ogorodnikov-Milne model, we analyze the proper motions of XPM2, UCAC4 and PPMXL stars. To estimate distances to the stars we used the method of statistical parallaxes herewith the random errors of the distance estimations do not exceed 10%. The method of statistical parallaxes was used to estimate the distances to stars with random er…
Solar and Heliospheric Observatory (SOHO) (1995)
St. Cyr, O. C.; Fleck, B.
SOHO is the most comprehensive space mission ever devoted to the study of the Sun and its nearby cosmic environment known as the heliosphere. It was launched in December 1995 and is currently funded at least through the end of 2016. SOHO's 12 instruments observe and measure structures and processes occurring inside as well as outside the Sun and w…
The Balmer Lines of He II in the Blue Wing of the Hydrogen Lyman α Line Observed in a Quiescent Prominence
Vial, J. -C.; Curdt, W.; Eurin, G.
We revisit the prominence observations in the Lyman α line of Curdt et al. (Astron. Astrophys.511, L4, 2010) and focus on the bump in the blue wing of the line, which we identify with He II Balmer lines. We determine the transition candidates, derive an upper limit for the width of the profile and an associated non-thermal velocity close to 0 km s…
Mobile applications and Virtual Observatory
Schaaff, A.; Jagade, S.
Within a few years, smartphones and Internet tablets have become the devices to access Web or standalone applications from everywhere, with a rapid development of the bandwidth of the mobile networks (e.g. 4G). Internet tablets are used to take notes during meetings or conferences, to read scientific papers in public transportation, etc. A smartph…
End-of-life disposal of libration point orbit missions: The case of Gaia
Armellin, Roberto; Rasotto, Mirco; Di Lizia, Pierluigi +1 more
This work investigates end of life disposal options for libration point orbit missions. Three different options are presented: the first one considers spacecraft's re-entry in Earth's atmosphere, the second one concerns the impact on the Moon, whereas the third one consists in the injection of the spacecraft into a heliocentric graveyard orbit. Th…
The nonlinear evolution of kinetic Alfvén wave with the ion acoustic wave and turbulent spectrum in the magnetopause region
Sharma, R. P.; Yadav, N.; Rinawa, M. L. +1 more
The mutual nonlinear interplay of kinetic Alfvén wave (KAW) and ion acoustic wave, for the high-β plasma (i.e., me/mi ≪ β ≪ 1, where β is thermal to magnetic pressure ratio) in the magnetopause, has been considered in the present study. A set of dimensionless nonlinear Schrödinger equations has been derived taking into accoun…
Long-term Monitoring of the Black Hole Candidate Swift J1753.5-0127 with INTEGRAL/SPI
Jourdain, E.; Roques, J. P.; Rodi, J.
The black hole candidate (BHC) Swift J1753.5-0127 went into outburst in 2005 June. Rather than fade into quiescence as most BHC transients do, it has remained in a low hard spectral state for most of the ∼9 years after its outburst. Its persistent emission during the hard state is reminiscent of the black hole Cyg X-1 and the BHCs 1E 1740.7-2942 a…