Results 71 to 80 of about 7,595 (254)

Corrected μβ for stars of Hipparcos catalogue from independent latitude observations over many decades [PDF]

Serbian Astronomical Journal, 2011
During the last century, there were many so-called independent latitude (IL) stations with the observations which were included into data of a few international organizations (like Bureau International de l'Heure - BIH, International Polar ...
Damljanović G., Milić I.S.
doaj   +1 more source

COMMISSION 8: ASTROMETRY [PDF]

Proceedings of the International Astronomical Union, 2011
Gaia is continuing well with its development and construction and is expected to achieve parallax accuracies of about 10 to 300 muas for 6 to 20 mag. It is scheduled to launch in 2013.
Evans, Dafydd W., Zacharias, Norbert, Kumkova, Irina, Andrei, Alexandre Humberto, Brown, Anthony, Gouda, Naoteru, Popescu, Petre, Souchay, Jean, Unwin, Stephen C., Zhu, Z.   +9 more
openaire   +2 more sources

The fireball of November 24, 1970, as the most probable source of the Ischgl meteorite

Meteoritics &Planetary Science, Volume 59, Issue 7, Page 1658-1691, July 2024.
Abstract The discovery of the Ischgl meteorite unfolded in a captivating manner. In June 1976, a pristine meteorite stone weighing approximately 1 kg, fully covered with a fresh black fusion crust, was collected on a mountain road in the high‐altitude Alpine environment.
Maria Gritsevich, Jarmo Moilanen, Jaakko Visuri, Matthias M. M. Meier, Colin Maden, Jürgen Oberst, Dieter Heinlein, Joachim Flohrer, Alberto J. Castro‐Tirado, Jorge Delgado‐García, Christian Koeberl, Ludovic Ferrière, Franz Brandstätter, Pavel P. Povinec, Ivan Sýkora, Florian Schweidler   +15 more
wiley   +1 more source

Astrometry during the past 100 years [PDF]

arXiv, 2011
The reports from 2008: "Astrometry and optics during the past 2000 years", are available at arXiv and at my website: www.astro.ku.dk/~erik/History.pdf . Here are now further contributions to the history of astrometry related to space astrometry. The development of photoelectric astrometry is followed from an experiment in 1925 up to the Hipparcos ...
arxiv  

Integrity Assessment and Verification Procedure of Angle-only Data for Low Earth Orbit Space Objects with Optical Wide-field PatroLNetwork (OWL-Net)

Journal of Astronomy and Space Sciences, 2019
The Optical Wide-field patroL-Network (OWL-Net) is a global optical network for Space Situational Awareness in Korea. The primary operational goal of the OWL-Net is to track Low Earth Orbit (LEO) satellites operated by Korea and to monitor the ...
Jin Choi, Jung Hyun Jo, Sooyoung Kim
doaj   +1 more source

METHOD FOR EVALUATING THE ASTROMETRIC AND PHOTOMETRIC CHARACTERISTICS OF COMMERCIAL SCANNERS IN THEIR APPLICATION FOR THE SCIENTIFIC PURPOSE

Odessa Astronomical Publications, 2014
Method  for estimating the accuracy of astrometric  (rectangular coordinates) and photometric (diameters and magnitudes) characteristics of commercial scanners is proposed and applied.
Yu. I. Protsyuk, V. N. Andruk, M. M. Muminov, Q. X. Yuldoshev, Sh. A. Ehgamberdiev, I. Eglitis, M. Eglite, O. E. Kovylianska, V. V. Golovnya, L. V. Kazantseva, S. G. Kashuba   +10 more
doaj   +1 more source

Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco

Astronomische Nachrichten, Volume 345, Issue 5, June 2024.
Abstract The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion
Jaroslav Merc, Peter Velez, Stéphane Charbonnel, Olivier Garde, Pascal Le Dû, Lionel Mulato, Thomas Petit, Jan Skowron   +7 more
wiley   +1 more source

Astrometry 1960-80: from Hamburg to Hipparcos [PDF]

arXiv, 2014
Astrometry, the most ancient branch of astronomy, was facing extinction during much of the 20th century in the competition with astrophysics. The revival of astrometry came with the European astrometry satellite Hipparcos, approved by ESA in 1980 and launched 1989.
arxiv  

Magnetic Field Studies in BL Lacertae through Faraday Rotation and a Novel Astrometric Technique

Galaxies, 2017
It is thought that dynamically important helical magnetic fields twisted by the differential rotation of the black hole’s accretion disk or ergosphere play an important role in the launching, acceleration, and collimation of active galactic nuclei (AGN ...
Sol N. Molina, José L. Gómez, Richard Dodson, María J. Rioja   +3 more
doaj   +1 more source

The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source