Results 81 to 90 of about 30,911 (193)

The Slow‐Rotating Nucleus of Comet C/2013 R1 (Lovejoy)

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT The close approach of comet C/2013 R1 (Lovejoy) allowed us to conduct an in‐depth study of the morphology of the inner coma. From the measurement of the dust emission structures expanding near the cometary nucleus in November–December 2013, we derived a slow rotation period of 47.8±1.2$$ 47.8\pm 1.2 $$ h.
Federico Manzini, Virginio Oldani, Andrea Farina, Paolo Ochner, Andrea Reguitti, Luigi R. Bedin, Jean Gabriel Bosch, Erik Bryssinck, Roberto Crippa, Stéphan Gaumont‐Guay, Carl W. Hergenrother, Joel Nicolas, Ivo Scheggia   +12 more
wiley   +1 more source

Chandra astrometry sets a tight upper limit to the proper motion of SGR 1900+14

, 2008
The soft gamma-ray repeater (SGR) SGR 1900+14 lies a few arcminutes outside the edge of the shell supernova remnant (SNR) G42.8+0.6. A physical association between the two systems has been proposed - for this and other SGR-SNR pairs - based on the ...
A. De Luca, De Luca, Durant, Fuchs, Gaensler, Gaensler, Hurley, Hurley, Hurley, K. Hurley, Kaplan, Kouveliotou, Lorimer, Marsden, Mereghetti, Motch, Muno, P. A. Caraveo, P. Esposito, Skrutskie, Thompson, Thompson, Thompson, Vrba, Woods   +24 more
core   +1 more source

A Slowly Pulsating Run‐Away B Star at High Galactic Latitude Ejected From a Spiral Arm

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT We report the discovery of the young B6 V run‐away star LAMOST J083323.18 + 430825.4, 2.5 kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determined from LAMOST spectra, indicating normal composition. Effective temperature (Teff$$ {T}_{\mathrm{eff}} $$ = 14,500$$ \mathrm{14,500} $$ K) and gravity (logg ...
Ulrich Heber, Maximilian Halenke, Aakash Bhat, Veronika Schaffenroth   +3 more
wiley   +1 more source

Cometary Astrometry [PDF]

Modern techniques for making cometary astrometric observations, reducing these observations, using accurate reference star catalogs, and computing precise orbits and ephemerides are discussed in detail and recommendations and suggestions are given in ...
Harrington, R. S., Marsden, B. G., West, R. M., Yeomans, D. K.   +3 more
core   +1 more source

Stellar Photometry and Astrometry with Discrete Point Spread Functions

, 2005
The key features of the MATPHOT algorithm for precise and accurate stellar photometry and astrometry using discrete Point Spread Functions are described.
Abramowitz, Arfken, Hook, Irwin, Jakobsen, Kenneth J. Mighell, King, King, Lauer, Levenberg, Marquardt, Mighell, Mighell, Mighell, Perryman, Pogson, Press, Tukey, Wells, Winick   +19 more
core   +2 more sources

Gaia Search for Stellar Companions of TESS Objects of Interest V

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer, Ann‐Kathrin Kollak, Lara Pietsch, Kai‐Uwe Michel   +3 more
wiley   +1 more source

GAIA: AGB stars as tracers of star formation histories in the Galaxy and beyond

, 2003
We discuss the tracing of star formation histories with ESA's space astrometry mission GAIA, emphasizing the advantages of AGB stars for this purpose. GAIA's microarcsecond-level astrometry, multi-band photometry and spectroscopy will provide individual ...
A Kučinskas, FR Ferraro, G Bertelli, MAC Perryman, V Vansevičius   +4 more
core   +2 more sources

On the Age Distribution of Classical Cepheids in the Galaxy

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter‐intuitive in the context of inside‐out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with ...
Friedrich Anders, Chloé Padois, Marc Vilanova Sar, Marcin Semczuk, Marc del Alcázar‐Julià, Francesca Figueras   +5 more
wiley   +1 more source

Direct-imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star HIP 39017

The Astronomical Journal
We present the direct-imaging discovery of a substellar companion (a massive planet or low-mass brown dwarf) to the young, γ Doradus ( γ Dor)-type variable star HIP 39017 (HD 65526). The companion’s SCExAO/CHARIS JHK (1.1–2.4 μ m) spectrum and Keck/NIRC2
Taylor L. Tobin, Thayne Currie, Yiting Li, Jeffrey Chilcote, Timothy D. Brandt, Brianna Lacy, Masayuki Kuzuhara, Maria Vincent, Mona El Morsy, Vincent Deo, Jonathan P. Williams, Olivier Guyon, Julien Lozi, Sebastien Vievard, Nour Skaf, Kyohoon Ahn, Tyler Groff, N. Jeremy Kasdin, Taichi Uyama, Motohide Tamura, Aidan Gibbs, Briley L. Lewis, Rachel Bowens-Rubin, Maïssa Salama, Qier An, Minghan Chen   +25 more
doaj   +1 more source

Discovery, Observational Data and the Orbit of the Amor Group Asteroid 2010 BT3

Open Astronomy, 2012
A project devoted to astrometric and photometric observations of asteroids at the Molėtai Observatory is described. One of its most important results is the discovery of the asteroid 2010 BT3 belonging to the Amor group of the near-Earth objects.
Černis K., Zdanavičius J., Wlodarczyk I., Stonkutė E.   +3 more
doaj   +1 more source