Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/~pmcc/TESS/TESS_AAS_2014_factsheet.pdf Дата изменения: Tue Feb 4 19:02:18 2014 Дата индексирования: Sat Mar 1 06:41:45 2014 Кодировка: Поисковые слова: transit

Transiting Exoplanet Survey Satellite
Principal Investigator: Dr. George R. Ricker, MIT

NASA EXPLORER MISSION, SCHEDULED TO LAUNCH IN 2017: An All-Sky Survey for Exoplanets Transiting Nearby Stars
TESS SCIENCE OBJECTIVES
DISCOVER TRANSITING EXOPLANETS ORBITING NEARBY, BRIGHT STARS The NASA Kepler Mission showed that planets are abundant throughout the Galaxy, but most of the Kepler planets orbit stars too distant and dim for further study. The NASA TESS Mission will nd exoplanets transiting nearby, bright stars: the best targets for followup characterization with JWST, Hubble, and large ground-based telescopes. TESS is designed to

TESS MISSION OVERVIEW
ALL SKY, TWO YEAR PHOTOMETRIC EXOPLANET DISCOVERY MISSION TESS will tile the sky with 26 observation sectors:

TESS SCIENCE INSTRUMENT

TESS SPACECRAFT
DESIGNED FOR PHOTOMETRIC STABILITY Heritage Orbital LEOStar-2 spacecraft bus: 3-axis stabilized pointing, with 3 arc-sec performance two-headed star tracker; 4 wheel zero-momentum system 400W single-axis articulating solar array passive thermal control mono-propellant propulsion system Ka-band 100 Mbps science downlink





monitor nearby, bright stars for focus on Earth and Super-Earth cover 400X larger sky area than span stellar spectral types of F5

transits size planets Kepler to M5

at least 27 days staring at each 24° x 96° sector brightest 100,000 stars at 1-minute cadence full frame images with 30-minute cadence map Northern hemisphere in rst year map Southern hemisphere in second year sectors overlap at Ecliptic poles for sensitivity to smaller and longer period planets in JWST Continuous Viewing Zone (CVZ)
27 days 54 days 81 days 108 days 189 days 351 days

FOUR WIDE FIELDOFVIEW CCD CAMERAS

TESS 2-year sky coverage map

Each of the four TESS cameras has 24° x 24° Field-of-View 105 mm e ective pupil diameter lens assembly with 7 optical elements athermal design 600nm - 1000nm bandpass 16.8 Megapixel, low-noise, low-power, MIT Lincoln Lab CCID-80 detector TESS telescopes provide photometric precision of

TESS will launch in 2017, in time to find planets for JWST to observe.

Planets that Transit Stars Brighter than J=10
Known Planets, December 2013 Predicted TESS Yield

Planet radius (Earth radii)

10

JWST continuous viewing zone

1 1 10 Orbital Period (days) 100

with systematic noise sources <60 ppm/hr.

TESS observes from unique High Earth Orbit (HEO):

For planets that transit, it is possible to observe:

fundamental properties: mass, radius, orbit dynamics: planet-planet interactions, mutual inclinations, moons, tides atmospheric composition + structure: transmission spectrum, emission spectrum, albedo, phase function, clouds, winds Such studies are achievable only for nearby planetary systems like those TESS will discover.



unobstructed view for continuous light curves two 13.7 day orbits per observation sector stable 2:1 resonance with Moon's orbit thermally stable and low-radiation a list of the closest transiting planet systems, which will forever be the best targets for followup studies.

The TESS legacy:

1.5 m

3 2

200 ppm in 1 hour on an I=10 star,