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  1. Article ; Online: Search and study of the space debris and asteroids within ISON project.

    Molotov, Igor E / Krugly, Yurij N / Elenin, Leonid V / Schildknecht, Thomas / Rumyantsev, Vasilij V / Inasaridze, Raguli Ya / Aivazyan, Vova R / Kapanadze, Givi V / Canals, Lluis R / Graziani, Filippo / Teofilatto, Paolo / Ehgamberdiev, Shuhrat A / Burkhonov, Otabek A / Chornaya, Ekaterina D / Kochergin, Anton V / Abdel-Aziz, Yehia A / Abdelaziz, Ahmed M / Kouprianov, Vladimir V / Zakhvatkin, Mikhail V /
    Stepanyants, Victor A / Reva, Inna V / Serebryanskiy, Alexander V / Schmalz, Sergei E / Nikolenko, Igor V

    Anais da Academia Brasileira de Ciencias

    2021  Volume 93, Issue suppl 1, Page(s) e20200145

    Abstract: International Scientific Optical Network (ISON) is an open international voluntary project specializing in observations of the near-Earth space objects. Observatories collaborating with ISON provide the global coverage and successfully combine the ... ...

    Abstract International Scientific Optical Network (ISON) is an open international voluntary project specializing in observations of the near-Earth space objects. Observatories collaborating with ISON provide the global coverage and successfully combine the observations of the space debris and asteroids. The network includes more than 50 telescopes of 27 observatories in 15 countries and has been working since 2005. ISON monitors the whole GEO region and tracks the objects at GEO, GTO, HEO and LEO. ISON data allowing maintenance of the database of the space objects orbits, validating space debris population model and providing conjunction assessment analysis for satellites at high orbits. ISON develops the technology of asteroid survey with small telescopes and arranges regular photometry observations of near-Earth asteroids (NEA) to investigate the YORP effect, search new binary NEAs, and support radar experiments.
    Language English
    Publishing date 2021-02-22
    Publishing country Brazil
    Document type Journal Article
    ZDB-ID 2046885-4
    ISSN 1678-2690 ; 0001-3765
    ISSN (online) 1678-2690
    ISSN 0001-3765
    DOI 10.1590/0001-3765202120200145
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni.

    Kimura, Mariko / Isogai, Keisuke / Kato, Taichi / Ueda, Yoshihiro / Nakahira, Satoshi / Shidatsu, Megumi / Enoto, Teruaki / Hori, Takafumi / Nogami, Daisaku / Littlefield, Colin / Ishioka, Ryoko / Chen, Ying-Tung / King, Sun-Kun / Wen, Chih-Yi / Wang, Shiang-Yu / Lehner, Matthew J / Schwamb, Megan E / Wang, Jen-Hung / Zhang, Zhi-Wei /
    Alcock, Charles / Axelrod, Tim / Bianco, Federica B / Byun, Yong-Ik / Chen, Wen-Ping / Cook, Kem H / Kim, Dae-Won / Lee, Typhoon / Marshall, Stuart L / Pavlenko, Elena P / Antonyuk, Oksana I / Antonyuk, Kirill A / Pit, Nikolai V / Sosnovskij, Aleksei A / Babina, Julia V / Baklanov, Aleksei V / Pozanenko, Alexei S / Mazaeva, Elena D / Schmalz, Sergei E / Reva, Inna V / Belan, Sergei P / Inasaridze, Raguli Ya / Tungalag, Namkhai / Volnova, Alina A / Molotov, Igor E / de Miguel, Enrique / Kasai, Kiyoshi / Stein, William L / Dubovsky, Pavol A / Kiyota, Seiichiro / Miller, Ian / Richmond, Michael / Goff, William / Andreev, Maksim V / Takahashi, Hiromitsu / Kojiguchi, Naoto / Sugiura, Yuki / Takeda, Nao / Yamada, Eiji / Matsumoto, Katsura / James, Nick / Pickard, Roger D / Tordai, Tamás / Maeda, Yutaka / Ruiz, Javier / Miyashita, Atsushi / Cook, Lewis M / Imada, Akira / Uemura, Makoto

    Nature

    2016  Volume 529, Issue 7584, Page(s) 54–58

    Abstract: How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. ... ...

    Abstract How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed to occur in the inner disk, causing repetitive patterns of large-amplitude X-ray variability (oscillations) on timescales of minutes to hours. In fact, such oscillations have been observed only in sources with a high mass-accretion rate, such as GRS 1915+105 (refs 2, 3). These large-amplitude, relatively slow timescale, phenomena are thought to have physical origins distinct from those of X-ray or optical variations with small amplitudes and fast timescales (less than about 10 seconds) often observed in other black-hole binaries-for example, XTE J1118+480 (ref. 4) and GX 339-4 (ref. 5). Here we report an extensive multi-colour optical photometric data set of V404 Cygni, an X-ray transient source containing a black hole of nine solar masses (and a companion star) at a distance of 2.4 kiloparsecs (ref. 8). Our data show that optical oscillations on timescales of 100 seconds to 2.5 hours can occur at mass-accretion rates more than ten times lower than previously thought. This suggests that the accretion rate is not the critical parameter for inducing inner-disk instabilities. Instead, we propose that a long orbital period is a key condition for these large-amplitude oscillations, because the outer part of the large disk in binaries with long orbital periods will have surface densities too low to maintain sustained mass accretion to the inner part of the disk. The lack of sustained accretion--not the actual rate--would then be the critical factor causing large-amplitude oscillations in long-period systems.
    Language English
    Publishing date 2016-01-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/nature16452
    Database MEDical Literature Analysis and Retrieval System OnLINE

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