symaski62

https://photojournal.jpl.nasa.gov/catalog/PIA22103

https://photojournal.jpl.nasa.gov/catalog/PIA22066

Citation

It is a composite of images taken through three "science" filters chosen for making hematite, an iron-oxide mineral, stand out as exaggerated purple.

https://arxiv.org/abs/1710.06209

The nature of the giant exomoon candidate Kepler-1625 b-i

demain   !    

https://fr.wikipedia.org/wiki/GW170104

https://arxiv.org/abs/1710.01081

A 1574-day periodicity of transits orbiting KIC 8462852

prochaine  Eclipse  (transit)

5) D792 16.0% 17-Oct-19   (17 octobre 2019)

8) D1519 21.0% 13-Oct-21  (13 octobre 2021)

https://arxiv.org/abs/1710.05929

Modelling the KIC8462852 light curves: compatibility of the dips and secular dimming with an exocomet interpretation

https://arxiv.org/abs/1710.01804

Dynamical Evolution Induced by Planet Nine

https://www.nasa.gov/feature/nasa-s-james-webb-space-telescope-to-be-launched-spring-2019

https://arxiv.org/abs/1709.03699

Details of Resonant Structures Within a Nice Model Kuiper Belt: Predictions for High-Perihelion TNO Detections

https://www.twitch.tv/nasa  =>  en direct

demain 

webbCam2

image, haut et gauche

2017-08-30 10:52:01 CDT

-253.150°C

dusty giant planet around HIP65426

Hip 65426

V (mag) => 7.0
Parallax (mas) => 8.98±0.30 (Gaia DR1)
SpT => A2V
température Teff(K) => 8840±200
Mstar(M) => 1.96±0.04
Rstar(R) => 1.77±0.05

HIP 65426 b

soleil à planète => 92 UA (830 mas)
température => 1300-1600 K
masse => 6-12 MJup
radius distance => 1.5 RJup

voilà

Systematic Error of the Gaia DR1 TGAS Parallaxes from Data for the Red Giant Clump

18h00 UTC et 20h00 CET en direct

mise à jour

[Ce message a été modifié par symaski62 (Édité le 25-05-2017).]

[Ce message a été modifié par symaski62 (Édité le 24-05-2017).]

#transit ! KIC 8462852

ALERTE !

We illustrate this bias using the exoplanet TRAPPIST-1b

T-1b > 400K to 800K

Star, continuum => 2760K
Star, line region => 1700K

[Ce message a été modifié par symaski62 (Édité le 06-05-2017).]

http://www.astrosurf.com/ubb/Forum1/HTML/004299.html

https://fr.wikipedia.org/wiki/LHS_1140

RA (J2000) 00:44:59.3
DEC (J2000) -15:16:18

LHS 1140 (V = 14.18)

[Ce message a été modifié par symaski62 (Édité le 21-04-2017).]

Updated Masses for the TRAPPIST-1 Planets

ancien
soleil masse = 0.08 M_sun

nouveau
soleil masse = 0.0802 M_sun

planète b,c,d,e,f,g et h (M_earth) update

[Ce message a été modifié par symaski62 (Édité le 21-04-2017).]

vidéo en direct

Plausible Compositions of the Seven TRAPPIST-1 Planets Using Long-term Dynamical Simulations

TRAPPIST-1 is a nearby ultra-cool dwarf that is host to a remarkable planetary system consisting of seven transiting planets.

Here we perform many thousands of N-body dynamical simulations with planet properties perturbed from the observed values and identify those that are stable for millions of years. This allows us to identify self-consistent orbital solutions that can be used in future studies. From our range of dynamical masses, we find that most of the planets are consistent with an Earth-like composition, where TRAPPIST-1f is likely to have a volatile-rich envelope.