symaski62

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Everything posted by symaski62

  1. Trous noirs : bientôt la première image !!

    @Kaptain oui, prochaine Le reportage du jour L’instrument Gravity installé à l’Observatoire du Paranal au Chili au Very Large Telescope suit depuis deux ans une étoile très proche de Sagittarius A*, le trou noir central de notre Galaxie. L’objectif est de tester les effets relativistes en conditions extrêmes, comme au voisinage d’un trou noir supermassif. Reportage avec Guy Perrin, astronome au LESIA de l'Observatoire de Paris Meudon, et co-investigateur de cet instrument. Par Céline Loozen
  2. https://arxiv.org/abs/1904.10530 Six Years of Sustained Activity from Active Asteroid (6478) Gault We present archival observations demonstrating main belt asteroid (6478) Gault has an extensive history of comet-like activity. possible !
  3. Trous noirs : bientôt la première image !!

    https://photojournal.jpl.nasa.gov/catalog/PIA23122
  4. TNO, KBO, SDO, plutinos & Co.

    LSST - Le Large Synoptic Survey Telescope https://fr.wikipedia.org/wiki/Large_Synoptic_Survey_Telescope
  5. https://arxiv.org/abs/1904.07100 Episodically Active Asteroid 6478 Gault
  6. TNO, KBO, SDO, plutinos & Co.

    https://arxiv.org/abs/1904.06333 "TNOs are Cool" (136472) Makemake 1430±9 km diamètre 0.77±0.03 albedo 136108 Haumea (2003 EL61) dwarf planet 2322x1704x1026 km diamètre 0.51±0.02 albedo Context. A group of trans-Neptunian objects (TNO) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO collisional family. Nineteen other dynamically similar objects lack water ice absorptions and are hypothesized to be dynamical interlopers. eau glace ?!
  7. A backup launch window opens on Thursday, April 11 at 6:35 p.m. EDT, or 22:35 UTC, and closes at 8:31 p.m. EDT, or 00:31 UTC on Friday, April 12. The satellite will be deployed approximately 34 minutes after liftoff. https://www.spacex.com/webcast
  8. Trous noirs : bientôt la première image !!

    https://www.eso.org/public/news/eso1907/ Paper I: The Shadow of the Supermassive Black Hole Paper II: Array and Instrumentation Paper III: Data processing and Calibration Paper IV: Imaging the Central Supermassive Black Hole Paper V: Physical Origin of the Asymmetric Ring Paper VI: The Shadow and Mass of the Central Black Hole L6 = First M87 Event Horizon Telescope Results. VI. M87 = oui
  9. Trous noirs : bientôt la première image !!

    https://iopscience.iop.org/journal/2041-8205 L1 = First M87 Event Horizon Telescope Results. I. M87 = oui L2 = First M87 Event Horizon Telescope Results. II. M87 = oui Sgr A = oui L3 = First M87 Event Horizon Telescope Results. III. M87 = oui 3C 279 = oui L4 = First M87 Event Horizon Telescope Results. IV. M87 = oui 3C 279 = oui L5 = First M87 Event Horizon Telescope Results. V. M87 = oui @jackbauer 2 voilà !
  10. Falcon Heavy - Arabsat 6A 18:36 EDT // 22:36 UTC, April 10th 2019 update
  11. Falcon Heavy Boosters Mated Together (timelapse)
  12. Falcon Heavy - Arabsat 6A 18:36 EDT // 22:36 UTC, April 9th 2019 update !
  13. 18h00 CET TEST fire confirmed !
  14. Exoplanètes : dernières découvertes

    https://www.eso.org/public/archives/releases/sciencepapers/eso1905/eso1905a.pdf (anglais) HR 8799 e spectral type : L7 brown dwarf The spectrum, with a signal-to-noise ratio of ≈5 per spectral channel, is compatible with a late-type L brown dwarf With a reduced χ ² of 2.4, the best fit indicates a spectral type close to L7 BD to estimate the orbital parameters and find a semimajor axis of 16.4 (+2.1/−1.1) AU, an eccentricity of 0.15 (± 0.08), and an inclination of 25° (± 8)° . temperature of 1150 ±50 K surface gravity of 10 4.3 (±0.3) cm s² radius of 1.17 (+0.13/−0.11) RJup mass of 10 (+7/−4) MJup exit: wow ! L7 brown dwarf à HR 8799 e ✨
  15. 1) 31/3/2019 => test par Falcon Heavy 2) 7/4/2019 23h36 CET à 1h35 CET (2 heures) voilà !
  16. https://arxiv.org/abs/1903.09943 voilà ! 2 queues par Gault
  17. bonjour Arabsat-6A 7 avril 2019 23h36 CET