8:23 Landing. The 24th successful landing. Video downfeed from the first stage continuous all the time. Barge feed cut off at the moment of touchdown. 102,000 viewers.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat NASA_TESS @NASA_TESS The first of six @NASA_TESS on orbit burns to reach the final science orbit, called AM1, is planned for today. 3:39 nachm. · 21. Apr. 2018
NASA_TESSVerifizierter Account @NASA_TESS Yesterday @NASA_TESS performed star tracker to gyro / Reaction Wheel Assemblies (RWA) calibration. Observatory is performing great with no issues. #TESS 09:12 - 23. Apr. 2018
NASA_TESSVerifizierter Account @NASA_TESS .@NASA_TESS remains in Coarse Pointing Inertial, all subsystems are nominal. #TESS continues to make contact with the Deep Space Network. The on-board orbit propagator was initialized and is now running. Additional observatory subsystems are planned for check out today. 05:13 - 24. Apr. 2018
Astrophysics > Earth and Planetary Astrophysics A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS)
Thomas Barclay, Joshua Pepper, Elisa V. Quintana (Submitted on 13 Apr 2018) The MIT-led Transiting Exoplanet Survey Satellite (TESS) has a goal of detecting terrestrial-mass planets orbiting stars bright enough for mass determination via ground-based radial velocity observations. Here we present estimates of how many exoplanets the TESS mission will detect, physical properties of the detected planets, and the properties of the stars that those planets orbit. This work uses stars drawn from the TESS Input Catalog Candidate Target List and revises yields from prior studies that were based on Galactic models. We model the TESS observing strategy to select approximately 200,000 stars at 2-minute cadence, while the remaining stars are observed at 30-min cadence in full-frame image data. We place zero or more planets in orbit around each star, with physical properties following measured exoplanet occurrence rates, and use the TESS noise model to predict the derived properties of the detected exoplanets. In the TESS 2-minute cadence mode we estimate that TESS will find 1250+/-70 exoplanets (90% confidence), including 250 smaller than 2 Earth-radii. Furthermore, we predict an additional 3200 planets will be found in full-frame image data orbiting bright dwarf stars and more than 10,000 around fainter stars. We predict that TESS will find 500 planets orbiting M-dwarfs, but the majority of planets will orbit stars larger than the Sun. Our simulated sample of planets contains hundreds of small planets amenable to radial velocity follow-up, potentially more than tripling the number of planets smaller than 4 Earth-radii with mass measurements. This sample of simulated planets is available for use in planning follow-up observations and analyses. Comments: Submitted to AAS Journals. Table 2 is available in machine-readable format from this https URL Subjects: Earth and Planetary Astrophysics (astro-ph.EP) Cite as: arXiv:1804.05050 [astro-ph.EP] (or arXiv:1804.05050v1 [astro-ph.EP] for this version) Submission history From: Thomas Barclay [v1] Fri, 13 Apr 2018 17:36:03 GMT (10443kb,D)
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat von Spaceflight Now, Apr 25, 2018Looping back near Earth for the first time since its launch one week ago, NASA’s Transiting Exoplanet Survey Satellite fired its thrusters early Wednesday to begin boosting its orbit toward the moon for a May 17 gravity assist maneuver that will help catapult the probe into its unique science orbit.
The spacecraft’s thrusters ignited early Thursday to raise the farthest point of TESS’s orbit around Earth closer to the moon. The maneuver was timed as TESS reached its first perigee — the low point of its elongated orbit — since launching April 18 from Cape Canaveral aboard a SpaceX Falcon 9 rocket.
The Falcon 9 launcher deposited TESS into an elliptical orbit stretching around 170,000 miles (270,000 kilometers) from Earth. TESS briefly fired its thrusters Saturday as it reached the farthest point, or apogee, of its initial orbit to raise its perigee from around 150 miles (250 kilometers) to around 1,400 miles (2,250 kilometers).
The next maneuver accomplished early Wednesday positioned TESS’s apogee at approximately 220,000 miles (354,000 kilometers), more than 90 percent of the distance of the moon’s orbit, according to tracking data published by the U.S. military.
Wednesday’s thruster firing was the second of six maneuvers planned to send TESS into its final operational orbit. Another burn next week will be timed to occur as TESS reaches its new apogee, followed by two additional perigee maneuvers that will fine-tune the satellite’s trajectory and set up for a flyby of the moon May 17.
The lunar flyby next month — targeting a distance of around 5,000 miles (8,000 kilometers) from the moon — will loop TESS into an orbit that takes it well beyond lunar distance, and a final major thruster firing will reduce the satellite’s apogee altitude in June.
By June 17, TESS will be in its final science orbit and ready to begin the planet hunt.
Zitat NASA_TESSVerifizierter Account @NASA_TESS .@NASA_TESS Mission Update: completed the P2M (Perigee 2 Maneuver), another on orbit burn to place #TESS into its final science orbit, nominally. The instrument is turned off for all maneuvers. While this maneuver is only for 7 secs it puts TESS on target for our lunar encounter. 17:44 - 6. Mai 2018
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
Zitat von Spaceflight Now, July 27, 2018NASA’s newest observatory in space has started its search for planets around other stars, officials said Friday, as astronomers zero in on worlds that are ripe for research by follow-up missions like the James Webb Space Telescope.
The Transiting Exoplanet Survey Satellite officially began a two-year science mission Wednesday, around three months after its blastoff from Cape Canaveral aboard a SpaceX Falcon 9 rocket.
“I’m thrilled that our new planet hunter mission is ready to start scouring our solar system’s neighborhood for new worlds,” said Paul Hertz, NASA’s astrophysics division director. “Now that we know there are more planets than stars in our universe, I look forward to the strange, fantastic worlds we’re bound to discover.” ... Ricker said he expects TESS to find between 500 and 1,000 planets that are between one and three times the size of Earth. Up to 20,000 planets the size of Neptune or Jupiter could be discovered by TESS, he said.
That would grow the number of known planets beyond our solar system by factor of five or more, but it’s not all about expanding the exoplanet catalog.
“The focus that TESS has on finding systems associated with bright stars means that they will be much easier to follow-up,” Ricker said in an interview with Spaceflight Now. “Once you find that a transiting system exists, it’s something that you’ll want to come back to and study more and more as improved instruments, satellites and telescopes become available because this is going to be the benchmark for future research.”
That’s where the James Webb Space Telescope becomes a crucial tool for astronomers seeking to learn more about the nature of faraway exoplanets. Scheduled for launch in early 2021, the oft-delayed Webb telescope will be able to probe the atmospheres of some of these worlds, learning about their chemical make-up and searching for evidence that the planets might be habitable.
"Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande." - Voltaire
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