symaski62

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Messages posté(e)s par symaski62

  3. Posté(e) · Modifié par symaski62

    OMG !     nouveau    2018 VG18 "Farout"

     

    https://en.wikipedia.org/wiki/2018_VG18

     

    500 km diamètre   O.o   

     

    https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2018 VG18;old=0;orb=1;cov=0;log=0;cad=0#orb

      

      EPOCH=  2458447.5 ! 2018-Nov-25.00 (TDB)         Residual RMS= .13787
   EC= .7717437510349855   QR= 21.73846988992007   TP= 2388887.3454751824
   OM= 247.4427078740553   W=  32.88824233518356   IN= 31.71377520866712
   A= 95.23712927242569    MA= 73.7658188901012    ADIST= 168.7357886549313
   PER= 929.43208          N= .001060461           ANGMOM= .106757005
   DAN= 23.36994           DDN= 109.43545          L= 276.2572425
   B= 16.5853487           MOID= 20.76670074       TP= 1828-Jun-13.8454751824
 
Asteroid physical parameters (km, seconds, rotational period in hours):
   GM= n.a.                RAD= n.a.               ROTPER= n.a.
   H= 3.2498               G= .150                 B-V= n.a.
                           ALBEDO= n.a.            STYP= n.a.

    1828  année   !!!!!!   O.o

     

    DupOkuYW4AE6sqb.jpg

     

    DupfHdAW4AEqX6x.jpg

    • Merci 2

  20. Posté(e) · Modifié par symaski62

    @biver   oui,    V* V645 Cen -- Flare Star  (HIP 70890)

     

    http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%403379714&Name=V* V645 Cen&submit=submit

     

    Parallaxes (mas): 769.8  mas  (1995 année)  

     

    Gaia DR2 5853498713160606720

     

    parallax (mas): 768.5004 mas  (2018 année)

    phot_g_mean_mag: 8.9536 mag   (green)

    phot_bp_mean_mag: 11.3829 mag  (bleu)

    phot_rp_mean_mag: 7.5864 mag  (red)

    teff_val: 3295.50 K  (kelvin)

     

    :)

  21. Posté(e) · Modifié par symaski62

    bonjour  

     

    KIC 8462852

     

    Gaia DR1 2081900940499099136  (2016 année)

     

    Parallaxes (mas): 2.55

     

    http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5ae24db836e8&-out.add=.&-source=I/345/gaia2&-c=301.56432344243 44.45684219166,eq=ICRS,rs=0.005&-out.orig=o

     

    Gaia DR2 2081900940499099136 (2018 année)

     

    Parallaxes (mas): 2.2185  = 451 +/- 5 parsecs  = 1471 +/- 16 light years 
    mag : 11.762624 
    teff_val (K) : 5899.25 
    radius_val (sunRad) : 1.65 
    lum_val (solLum) : 2.963

     

    --------------------------------

     

    Gaia DR2 2635476908753563008   (TRAPPIST-1)

     

    http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5ae2c7f8067f&-out.add=.&-source=I/345/gaia2&-c=346.62639186971 -5.04346180221,eq=ICRS,rs=0.005&-out.orig=o

     

    parallax : 80.4512 mas
    phot_g_mean_mag: 15.6451 mag
    phot_bp_mean_mag: 18.9982 mag
    phot_rp_mean_mag: 14.0967 mag
    teff_val: 3352.33 K
     

    :D

  25. Posté(e)

    https://ssd.jpl.nasa.gov/horizons.cgi

      

    Ephemeris Type [change] : 	OBSERVER
Target Body [change] : 	SpaceX Roadster (spacecraft) (Tesla) [-143205]
Observer Location [change] : 	Geocentric [500]
Time Span [change] : 	Start=2018-02-26, Stop=2018-03-08, Step=1 h
Table Settings [change] : 	defaults
Display/Output [change] : 	default (formatted HTML)

-------------------------------------------------------------------------------

Encounter predictions for s8 (with gravity-only dynamics):

    Date (TDB)      Body  CA Dist  MinDist  MaxDist  Vrel  TCA3Sg  Nsigs  P_i/p
  ----------------- ----- -------  -------  ------- ------ ------ ------ ------
  2018 Feb 08.09700 Moon  .000936  .000936  .000936  3.962   0.42 40889.  0.000
  2020 Oct 07.27671 Mars  .049248  .048632  .049996  8.132  29.03 6.68E5  0.000
  2035 Apr 22.31261 Mars  .021004  .007334  .035038  8.315 142.40 37596.  0.000
  2047 Jan 12.52967 Earth .029674  .019448  .039078  4.422 4391.7 73261.  0.000
  2050 Mar 19.02367 Earth .113309  .089472  .135482  7.215 2540.6 2.42E5  0.000
 
     Date    = Nominal encounter time (Barycentric Dynamical Time)
     CA_Dist = Highest probability close approach distance to body, au
     MinDist = 3-sigma minimum encounter distance, au
     MaxDist = 3-sigma maximum encounter distance, au
     Vrel    = Relative velocity at nominal encounter time
     TCA3Sg  = 3-sigma uncertainty in close enocunter time, minutes
     Nsigs   = Number of sigmas to encounter body at nominal encounter time 
     P_i/p   = Linearized probability of impact

     

    voilà  :)