symaski62

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About symaski62

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    faire de la science
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. https://arxiv.org/abs/1907.10077 Active asteroid (6478) Gault: a blue Q-type surface below the dust ? quoi ?
  7. 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
  8. 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.
  9. 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
  10. 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 !
  11. Exoplanètes : dernières découvertes

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

    https://arxiv.org/abs/1906.02071 Colors of Trans-Neptunian Contact Binaries
  13. 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 !