symaski62

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Everything posted by symaski62

  1. https://www.aavso.org/aavso-alert-notice-672 TIC 185336364 => KIC 8462852 (Tabby's Star) https://exofop.ipac.caltech.edu/tess/target.php?id=185336364
  2. KIC 8462852 (Tabby's Star) pour TESS

    WOW ! TIC 185336364 Sector 15
  3. C/2019 Q4 (Borisov) = 2I/Borisov https://www.projectpluto.com/temp/gb00234.htm q 2.008367322 +/- 0.00303 e 3.36398165 +/- 0.0139 461 of 577 observations 2019 Aug. 30-Sept. 24; mean residual 0".550 https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2019 Q4;old=0;orb=1;cov=0;log=0;cad=0#orb q 1.99717336375388 e 3.314321521681457 first obs. used 2019-08-30, last obs. used 2019-09-27 http://www.minorplanetcenter.net/db_search/show_object?utf8=✓&object_id=C%2F2019+Q4 eccentricity 3.3835756 perihelion distance (AU) 2.0126273 574 total observations over interval: 2019 08 30.04398 – 2019 09 24.14251 loin eccentricity 3.31 à 3.38 🤔 moyen 3.345
  4. Sonde JUNO : destination Jupiter

    https://photojournal.jpl.nasa.gov/catalog/PIA23437
  5. Exoplanètes : dernières découvertes

    https://arxiv.org/abs/1909.09158 Searching for a cometary belt around Trappist-1 with ALMA
  6. (6478) Gault est un astéroïde par comète http://www.spaceweather.com/archive.php?view=1&day=15&month=01&year=2019
  7. (mise à jour) MPC (IAU) 447 total observations over interval: 2019 08 30.04398 – 2019 09 20.166194 eccentricity 3.3892848 perihelion distance (AU) 2.0140361 ----------------------------------- JPL first obs. used 2019-08-30 last obs. used 2019-09-20 eccentricity 3.445224326645891 perihelion distance (AU) 2.027619646107458 ---------------------------------- moyen eccentricity 3.41 perihelion distance (AU) 2.0205
  8. KIC 8462852 (Tabby's Star) pour TESS

    TIC 185336364 Sector 14
  9. mise à jour IAU MPC 305 total observations over interval: 2019 08 30.04398 – 2019 09 16.18422 eccentricity 3.4315836 perihelion distance (AU) 2.0244417 ------------------------- JPL first obs. used 2019-08-30 last obs. used 2019-09-16 eccentricity 3.671315408428195 perihelion distance (AU) 2.078691392377223
  10. comète C/2017 K2

    mise à jour M1= 6. M2= n.a. k1= 6. k2= n.a. PHCOF= n.a. m1 = 1.0 + 5 log d + 10.0 log r (bleu) => total m1 = 6 + 5 log d + 6 log r (rouge) => noyau
  11. comète C/2017 K2

    http://www.aerith.net/comet/catalog/2017K2/2017K2.html https://fr.wikipedia.org/wiki/C/2017_K2_(PANSTARRS) Diamètre du noyau : 18 km Object Data Page ( https://ssd.jpl.nasa.gov/horizons.cgi ) JPL/HORIZONS PANSTARRS (C/2017 K2) 2019-Sep-16 09:05:37 Rec #:90004309 (+COV) Soln.date: 2019-Aug-30_07:15:46 # obs: 1637 (2013-2019) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2458297.5 ! 2018-Jun-28.0000000 (TDB) RMSW= n.a. EC= 1.000356591340322 QR= 1.807447853414116 TP= 2459934.3926858259 OM= 88.24602693680218 W= 236.0565228160738 IN= 87.54582022887195 A= -5068.681285927102 MA= -.0044707646256383 ADIST= 9.999999E99 PER= 9.999999E99 N= 2.731E-6 ANGMOM= .032709058 DAN= 8.19059 DDN= 2.31977 L= 271.8862335 B= -55.9785284 MOID= 1.10018003 TP= 2022-Dec-20.8926858259 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 6. M2= n.a. k1= 6. k2= n.a. PHCOF= n.a. COMET comments 1: soln ref.= JPL#26, data arc: 2013-05-12 to 2019-08-22 2: k1=6.; m1 = 1.0 + 5 log d + 10.0 log r (bleu) => total m1 = 6 + 5 log d + 6 log r (rouge) => noyau
  12. https://www.projectpluto.com/temp/gb00234.htm OOOF calculer simulation ? Orbital elements: C/2019 Q4 Perihelion 2019 Dec 7.523918 +/- 0.49 TT = 12:34:26 (JD 2458825.023918) Epoch 2019 Sep 13.0 TT = JDT 2458739.5 Ju: 0.8486 Gray q 2.0497402180 +/- 0.0209 (J2000 ecliptic) M(N) 10.6 K 10.0 Peri. 208.1472783 +/- 0.43 Node 308.5238180 +/- 0.18 e 3.538778351 +/- 0.0973 Incl. 43.6690557 +/- 0.18 204 of 226 observations 2019 Aug. 30-Sept. 13; mean residual 0".566
  13. http://www.minorplanetcenter.net/db_search/show_object?utf8=✓&object_id=C%2F2019+Q4 eccentricity => 3.2078726 perihelion distance (AU) => 1.9715486 https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2019 Q4;old=0;orb=1;cov=0;log=0;cad=0#orb eccentricity => 3.70429496893662 perihelion distance (AU) => 2.08596458569878 calculer simulation ? IAU vs JPL
  14. mars 2020 rover

    Nasa: le prochain robot martien pourrait produire de l'oxygène sur site http://www.bfmtv.com/planete/nasa-prochain-robot-martien-pourrait-produire-loxygene-site-822859.html
  15. TNO, KBO, SDO & Co.

    https://arxiv.org/abs/1908.10286 A Dearth of Small Members in the Haumea Family Revealed by the OSSOS Survey 2013 UQ15
  16. https://arxiv.org/abs/1907.10077 Active asteroid (6478) Gault: a blue Q-type surface below the dust ? quoi ?
  17. Rosetta -100 jours :)

    http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_100_days_to_wake-up vidéo
  18. https://arxiv.org/abs/1906.10195 We also found a rotational period Prot = 3.360+-0.005 h and show evidence that 6478 might be double.
  19. Exoplanètes : dernières découvertes

    pardon jamais vu Teegarden’s Star https://arxiv.org/pdf/1906.07196.pdf However, even if RVs turn out to be much more sensitive to stellar variability and one period is connected to stellar rotation, then at least the other signal should be a planet. Period ratios of 2:1 can be caused by the harmonics of stellar rotation (but also eccentric and resonant planets). However, the period ratio is Pc/Pb = 2.32, which is close to but noticeably different from 2:1. Such a discrepancy is hard to explain even with differential rotation, while departures from exact 2:1 ratios are often observed in exoplanet systems 2:1 Résonance orbitale à 2 planètes confirme
  20. Exoplanètes : dernières découvertes

    nom : Teegarden's 12 light years = 3.831 (± 0.004) pc 2 planètes ! http://exoplanet.eu/catalog/teegarden's_b/ => 5 jours http://exoplanet.eu/catalog/teegarden's_c/ => 11.4 jours wow !
  21. Exoplanètes : dernières découvertes

    http://exoplanet.eu/catalog/51_Eri_b/ Planet 51 Eri b
  22. TNO, KBO, SDO & Co.

    https://arxiv.org/abs/1906.02071 Colors of Trans-Neptunian Contact Binaries
  23. je regarde l'étoile, Les satellites #Starlink 60 28/05/2019, 23h36 à 23h52 CET l'oeil nu Starlink -1 ou -2 mag (moins 1 sec) brille !