Herschel / Planck Issue : 3 / 3 System Requirements Date : 23/07/04 Specification ( SRS ) Page : I
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
The Planck Satellite and the Cosmic Microwave Background
The Cosmic Microwave Background, Dark Matter and Dark Energy Anthony Lasenby, Astrophysics Group, Cavendish Laboratory and Kavli Institute for Cosmology, Cambridge Overview The Cosmic Microwave Background — exciting new results from the Planck Satellite Context of the CMB =) addressing key questions about the Big Bang and the Universe, including Dark Matter and Dark Energy Planck Satellite and planning for its observations have been a long time in preparation — first meetings in 1993! UK has been intimately involved Two instruments — the LFI (Low — e.g. Cambridge is the Frequency Instrument) and the HFI scientific data processing (High Frequency Instrument) centre for the HFI — RAL provided the 4K Cooler The Cosmic Microwave Background (CMB) So what is the CMB? Anywhere in empty space at the moment there is radiation present corresponding to what a blackbody would emit at a temperature of ∼ 2:74 K (‘Blackbody’ being a perfect emitter/absorber — furnace with a small opening is a good example - needs perfect thermodynamic equilibrium) CMB spectrum is incredibly accurately black body — best known in nature! COBE result on this showed CMB better than its own reference b.b. within about 9 minutes of data! Universe History Radiation was emitted in the early universe (hot, dense conditions) Hot means matter was ionised Therefore photons scattered frequently off the free electrons As universe expands it cools — eventually not enough energy to keep the protons and electrons apart — they History of the Universe: superluminal inflation, particle plasma, -
Coryn Bailer-Jones Max Planck Institute for Astronomy, Heidelberg
What will Gaia do for the disk? Coryn Bailer-Jones Max Planck Institute for Astronomy, Heidelberg IAU Symposium 254, Copenhagen June 2008 Acknowledgements: DPAC, ESA, Astrium 1 Gaia in a nutshell • high accuracy astrometry (parallaxes, proper motions) • radial velocities, optical spectrophotometry • 5D (some 6D) phase space survey • all sky survey to G=20 (1 billion objects) • formation, structure and evolution of the Galaxy • ESA mission for launch in late 2011 2 Gaia capabilities Hipparcos Gaia Magnitude limit 12.4 G = 20.0 No. sources 120 000 1 000 000 000 quasars 0 1 million galaxies 0 10 million Astrometric accuracy ~ 1000 μas 12-25 μas at G=15 100-300 μas at G=20 Photometry 2 bands spectra 330-1000 nm Radial velocities none 1-10 km/s to G=17 Target selection input catalogue real-time onboard selection 3 How the accuracy varies • astrometric errors dominated by photon statistics • parallax error: σ(ϖ) ~ 1/√flux ~ distance, d for fixed MV • fractional parallax error: σ(ϖ)/ϖ ~ d2 • fractional distance error: fde ~ d2 • transverse velocity accuracy: σ(v) ~ d2 • Example accuracy • K giant at 6 kpc (G=15): fde = 2%, σ(v) = 1 km/s • G dwarf at 2 kpc (G=16.5): fde = 8%, σ(v) = 0.4 km/s 4 Distance statistics 8kpc At larger distances may use spectroscopic parallaxes 100 000 stars with fde <0.1% 11 million stars with fde <1% panther-observatory.com NGC4565 from Image: 150 million stars with fde <10% 5 Payload overview 6 Instruments 7 Radial velocity spectrograph • R=11 500 • CaII triplet (848-874 nm) • more detailed APE for V < 14 (still millions of stars) 8 Spectrophotometry Figure: Anthony Brown Anthony Figure: Dispersion: 7-15 nm/pixel (red), 4-32 nm/pixel (blue) 9 Stellar parameters • Infer via pattern recognition (e.g. -
Interferometric Orbits of New Hipparcos Binaries
Interferometric orbits of new Hipparcos binaries I.I. Balega1, Y.Y. Balega2, K.-H. Hofmann3, E.V. Malogolovets4, D. Schertl5, Z.U. Shkhagosheva6 and G. Weigelt7 1 Special Astrophysical Observatory, Russian Academy of Sciences [email protected] 2 Special Astrophysical Observatory, Russian Academy of Sciences [email protected] 3 Max-Planck-Institut fur¨ Radioastronomie [email protected] 4 Special Astrophysical Observatory, Russian Academy of Sciences [email protected] 5 Max-Planck-Institut fur¨ Radioastronomie [email protected] 6 Special Astrophysical Observatory, Russian Academy of Sciences [email protected] 7 Max-Planck-Institut fur¨ Radioastronomie [email protected] Summary. First orbits are derived for 12 new Hipparcos binary systems based on the precise speckle interferometric measurements of the relative positions of the components. The orbital periods of the pairs are between 5.9 and 29.0 yrs. Magnitude differences obtained from differential speckle photometry allow us to estimate the absolute magnitudes and spectral types of individual stars and to compare their position on the mass-magnitude diagram with the theoretical curves. The spectral types of the new orbiting pairs range from late F to early M. Their mass-sums are determined with a relative accuracy of 10-30%. The mass errors are completely defined by the errors of Hipparcos parallaxes. 1 Introduction Stellar masses can be derived only from the detailed studies of the orbital motion in binary systems. To test the models of stellar structure and evolution, stellar masses must be determined with ≈ 2% accuracy. Until very recently, accurate masses were available only for double-lined, detached eclipsing binaries [1]. -
Non-Principal Axis Rotation (Tumbling) Asteroids
NON-PRINCIPAL AXIS ROTATION (TUMBLING) ASTEROIDS Asteroid PAR Per1 Amp1 Per2 Amp2 Reference 244 Sita T0 129.51 0.82 0 129.51 0.82 Brinsfield, 09 253 Mathilde T 417.7 0.50 –3 417.7 0.45 250. Mottola, 95 –3 418. 0.5 250. Pravec, 05 288 Glauke T 1170. 0.9 –1 1200. 0.9 Harris, 99 0 Pravec, 14 –2 1170. 0.37 740. Pilcher, 15 299∗ Thora T– 272.9 0.50 0 274. 0.39 Pilcher, 14 +2 272.9 0.47 Pilcher, 17 319∗ Leona T 430. 0.5 –2 430. 0.5 1084. Pilcher, 17 341∗ California T 318. 0.92 –2 318. 0.9 250. Pilcher, 17 –2 317.0 0.54 Polakis, 17 –1 317.0 0.92 Polakis, 17 408 Fama T0 202.1 0.58 0 202.1 0.58 Stephens, 08 470 Kilia T0 290. 0.26 0 290. 0.26 Stephens, 09 0 Stephens, 09 496∗ Gryphia T 1072. 1.25 –2 1072. 1.25 Pilcher, 17 571 Dulcinea T 126.3 0.50 –2 126.3 0.50 Stephens, 11 630 Euphemia T0 350. 0.45 0 350. 0.45 Warner, 11 703∗ No¨emi T? 200. 0.78 –1 201.7 0.78 Noschese, 17 0 115.108 0.28 Sada, 17 –2 200. 0.62 Franco, 17 707 Ste¨ına T0 414. 1.00 0 Pravec, 14 763∗ Cupido T 151.5 0.45 –1 151.1 0.24 Polakis, 18 –2 151.5 0.45 101. Pilcher, 18 823 Sisigambis T0 146. -
Herschel, Planck to Look Deep Into Cosmos
Jet APRIL Propulsion 2009 Laboratory VOLUME 39 NUMBER 4 Herschel, Planck to look In a cleanroom at Centre Spatial Guy- deep into anais, Kourou, French Guyana, the Herschel spacecraft is raised cosmos from its transport con- tainer to begin launch Thanks in large part to the preparations. contributions of instruments By Mark Whalen and technologies developed by JPL, long-range views of the universe are about to become much clearer. European European Space Agency When the European Space Agency’s Herschel and wavelengths, continuing to move further into the far like the Hubble Space Telescope and ground-based Planck missions take to the sky together, onboard will infrared. There’s overlap with Spitzer, but Herschel telescopes to view galaxies in the billions, and millions be JPL’s legacy in cosmology studies. extends the range: Spitzer’s wavelength range is 3.5 to more with spectroscopy. In comparison, in the far infra- The pair are scheduled for launch together aboard an 160 microns; Herschel will go from 65 to 672 microns. red we have maybe a few hundred pictures of galaxies Ariane 5 rocket from Kourou, French Guyana on April Herschel’s mirror is much bigger than Spitzer’s and its that emit primarily in the far-infrared, but we know they 29. Once in orbit, Herschel and Planck will be sent angular resolution at the same wavelength will be sub- are important in a cosmological sense, and just the tip on separate trajectories to the second Lagrange point stantially better. of the iceberg. With Herschel, we will see hundreds of (L2), outside the orbit of the moon, to maintain an ap- “Herschel is really critical for studying important pro- thousands of galaxies, detected right at the peak of the proximately constant distance of 1.5 million kilometers cesses like how stars are formed,” said Paul Goldsmith, wavelengths they emit.” (900,000 miles) from Earth, in the opposite direction NASA Herschel project scientist and chief technologist A large fraction of the time with Herschel will be than the sun from Earth. -
The Minor Planet Bulletin
THE MINOR PLANET BULLETIN OF THE MINOR PLANETS SECTION OF THE BULLETIN ASSOCIATION OF LUNAR AND PLANETARY OBSERVERS VOLUME 36, NUMBER 3, A.D. 2009 JULY-SEPTEMBER 77. PHOTOMETRIC MEASUREMENTS OF 343 OSTARA Our data can be obtained from http://www.uwec.edu/physics/ AND OTHER ASTEROIDS AT HOBBS OBSERVATORY asteroid/. Lyle Ford, George Stecher, Kayla Lorenzen, and Cole Cook Acknowledgements Department of Physics and Astronomy University of Wisconsin-Eau Claire We thank the Theodore Dunham Fund for Astrophysics, the Eau Claire, WI 54702-4004 National Science Foundation (award number 0519006), the [email protected] University of Wisconsin-Eau Claire Office of Research and Sponsored Programs, and the University of Wisconsin-Eau Claire (Received: 2009 Feb 11) Blugold Fellow and McNair programs for financial support. References We observed 343 Ostara on 2008 October 4 and obtained R and V standard magnitudes. The period was Binzel, R.P. (1987). “A Photoelectric Survey of 130 Asteroids”, found to be significantly greater than the previously Icarus 72, 135-208. reported value of 6.42 hours. Measurements of 2660 Wasserman and (17010) 1999 CQ72 made on 2008 Stecher, G.J., Ford, L.A., and Elbert, J.D. (1999). “Equipping a March 25 are also reported. 0.6 Meter Alt-Azimuth Telescope for Photometry”, IAPPP Comm, 76, 68-74. We made R band and V band photometric measurements of 343 Warner, B.D. (2006). A Practical Guide to Lightcurve Photometry Ostara on 2008 October 4 using the 0.6 m “Air Force” Telescope and Analysis. Springer, New York, NY. located at Hobbs Observatory (MPC code 750) near Fall Creek, Wisconsin. -
Epo in a Multinational Context
→EPO IN A MULTINATIONAL CONTEXT Heidelberg, June 2013 ESA FACTS AND FIGURES • Over 40 years of experience • 20 Member States • Six establishments in Europe, about 2200 staff • 4 billion Euro budget (2013) • Over 70 satellites designed, tested and operated in flight • 17 scientific satellites in operation • Six types of launcher developed • Celebrated the 200th launch of Ariane in February 2011 2 ACTIVITIES ESA is one of the few space agencies in the world to combine responsibility in nearly all areas of space activity. • Space science • Navigation • Human spaceflight • Telecommunications • Exploration • Technology • Earth observation • Operations • Launchers 3 →SCIENCE & ROBOTIC EXPLORATION TODAY’S SCIENCE MISSIONS (1) • XMM-Newton (1999– ) X-ray telescope • Cluster (2000– ) four spacecraft studying the solar wind • Integral (2002– ) observing objects in gamma and X-rays • Hubble (1990– ) orbiting observatory for ultraviolet, visible and infrared astronomy (with NASA) • SOHO (1995– ) studying our Sun and its environment (with NASA) 5 TODAY’S SCIENCE MISSIONS (2) • Mars Express (2003– ) studying Mars, its moons and atmosphere from orbit • Rosetta (2004– ) the first long-term mission to study and land on a comet • Venus Express (2005– ) studying Venus and its atmosphere from orbit • Herschel (2009– ) far-infrared and submillimetre wavelength observatory • Planck (2009– ) studying relic radiation from the Big Bang 6 UPCOMING MISSIONS (1) • Gaia (2013) mapping a thousand million stars in our galaxy • LISA Pathfinder (2015) testing technologies -
Michael Perryman
Michael Perryman Cavendish Laboratory, Cambridge (1977−79) European Space Agency, NL (1980−2009) (Hipparcos 1981−1997; Gaia 1995−2009) [Leiden University, NL,1993−2009] Max-Planck Institute for Astronomy & Heidelberg University (2010) Visiting Professor: University of Bristol (2011−12) University College Dublin (2012−13) Lecture program 1. Space Astrometry 1/3: History, rationale, and Hipparcos 2. Space Astrometry 2/3: Hipparcos science results (Tue 5 Nov) 3. Space Astrometry 3/3: Gaia (Thu 7 Nov) 4. Exoplanets: prospects for Gaia (Thu 14 Nov) 5. Some aspects of optical photon detection (Tue 19 Nov) M83 (David Malin) Hipparcos Text Our Sun Gaia Parallax measurement principle… Problematic from Earth: Sun (1) obtaining absolute parallaxes from relative measurements Earth (2) complicated by atmosphere [+ thermal/gravitational flexure] (3) no all-sky visibility Some history: the first 2000 years • 200 BC (ancient Greeks): • size and distance of Sun and Moon; motion of the planets • 900–1200: developing Islamic culture • 1500–1700: resurgence of scientific enquiry: • Earth moves around the Sun (Copernicus), better observations (Tycho) • motion of the planets (Kepler); laws of gravity and motion (Newton) • navigation at sea; understanding the Earth’s motion through space • 1718: Edmond Halley • first to measure the movement of the stars through space • 1725: James Bradley measured stellar aberration • Earth’s motion; finite speed of light; immensity of stellar distances • 1783: Herschel inferred Sun’s motion through space • 1838–39: Bessell/Henderson/Struve -
The Sun As a Gravitational Lens : a Target for Space Missions a Target
“New Trends in Astrodynamics and Applications - V” Po litecn ico di Mil ano, Mil ano (It al y) , 30 J une, 1 -2 Ju ly 2008 The Sun as a Gravitational Lens : A Target for Space Missions Reaching 550 AU to 1000 AU Claudio Maccone Member of the International Academy of Astronautics Home Paggpe: http://www.maccone.com/ E-mail: [email protected] 1 Gravitational Lens of the Sun Figure 1: Basic geometry of the gravitational lens of the Sun: the minimal focal length at 550 AU and the FOCAL spacecraft position. 2 Gravitational Lens of the Sun • The geometry of the Sun gravitational lens is easily described: incoming electromagnetic waves (arriving, for instance, from the center of the Galaxy) pass outside the Sun and pass wihiithin a certain distance r of its center. • Then a basic result following from General Relativity shows that the corresponding dfltideflection angle ()(r) at the distance r from the Sun center is given by (Einstein, 1907): 4GM α (r ) = Sun . c 2 r 3 Gravitational Lens of the Sun • Let’s set the following parameters for the Sun: 1. Assumed Mass of the Sun: 1.9889164628 . 1030 kg, that is μSun = 132712439900 kg3s-2 2. Assumed Radius of the Sun: 696000 km 3. Sun Mean Density: 1408.316 kgm-3 4. Sc hwarzsc hild radi us of th e S un: 2 .953 k m One then finds the BASIC RESULT: MINIMAL FOCAL DISTANCE OF THE SUN: 548.230 AU ~ 3.17 light days ~ 13. 86 times th e Sun-to-Plut o di st ance. -
ESA's Gaia Mission: a Billion Stars with a Billion Pixels
FOCUS I PHOTONIC TECHNIQUES AND TECHNOLOGIES ESA’S GAIA MISSION: a billion stars with a billion pixels Jos DE BRUIJNE 1 Astrometry is the astronomical discipline of measuring the positions, 2 Matthias ERDMANN and changes therein, of celestial bodies. Accurate astrometry from 1 Directorate of Science, European Space Agency, ESA/ESTEC, the ground is limited by the blurring effects induced by the Earth’s The Netherlands atmosphere. Since decades, Europe has been at the forefront of 2 Directorate of Earth Observation, making astrometric measurements from space. The European Space European Space Agency, ESA/ ESTEC, The Netherlands Agency (ESA) launched the first satellite dedicated to astrometry, [email protected] named Hipparcos, in 1989, culminating in the release of the Hipparcos Catalogue containing astrometric data for 117 955 stars in 1997. Since mid 2014, Hipparcos’ successor, Gaia, has been collecting astrometric data, with a 100 times improved precision, for 10 000 times as many stars. lthough astrometry sounds revolves around the sun – and of pro- the telescope in 1608, the first reliable boring, it is of fundamental per motion – the continuous, true parallax measurement of a star other Aimportance to many branches displacement of a star on the sky as than the sun was only made in 1838. of astronomy and astrophysics. The a result of its velocity in space relative The reason for this late success is the reason for this is that astrometry can to the sun. Measuring the distances fact that stars are located at extremely determine -
4 from the Herschel-VVDS-CFHTLS-D1 Field
A&A 572, A90 (2014) Astronomy DOI: 10.1051/0004-6361/201323089 & c ESO 2014 Astrophysics Hidden starbursts and active galactic nuclei at 0 < z < 4 from the Herschel-VVDS-CFHTLS-D1 field: Inferences on coevolution and feedback B. C. Lemaux1,E.LeFloc’h2,O.LeFèvre1,O.Ilbert1, L. Tresse1,L.M.Lubin3, G. Zamorani4,R.R.Gal5, P. Ciliegi4, P. Cassata1,9,D.D.Kocevski6,7,E.J.McGrath7,S.Bardelli4, E. Zucca4, and G. K. Squires8 1 Aix-Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France e-mail: [email protected] 2 Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu – CNRS – Université Paris Diderot, CE-Saclay, pt courrier 131, 91191 Gif-sur-Yvette, France 3 Department of Physics, University of California, Davis, 1 Shields Avenue, Davis, CA 95616, USA 4 INAF – Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy 5 University of Hawai’i, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 6 Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, USA 7 Department of Physics and Astronomy, Colby College, Waterville, ME 04901, USA 8 Spitzer Science Center, California Institute of Technology, M/S 220-6, 1200 E. California Blvd., Pasadena, CA 91125, USA 9 Instituto de Fisica y Astronomía, Facultad de Ciencias, Universidad de Valparaíso, Gran Breta˜na 1111, Casilla 5030, Playa Ancha, Valparaíso, Chile Received 20 November 2013 / Accepted 17 September 2014 ABSTRACT We investigate of the properties of ∼2000 Herschel/SPIRE far-infrared-selected galaxies from 0 < z < 4intheCFHTLS-D1field. Using a combination of extensive spectroscopy from the VVDS and ORELSE surveys, deep multiwavelength imaging from CFHT, VLA, Spitzer, XMM-Newton,andHerschel, and well-calibrated spectral energy distribution fitting, Herschel-bright galaxies are com- pared to optically-selected galaxies at a variety of redshifts. -
Mission to the Solar Gravity Lens Focus: Natural Highground for Imaging Earth-Like Exoplanets L
Planetary Science Vision 2050 Workshop 2017 (LPI Contrib. No. 1989) 8203.pdf MISSION TO THE SOLAR GRAVITY LENS FOCUS: NATURAL HIGHGROUND FOR IMAGING EARTH-LIKE EXOPLANETS L. Alkalai1, N. Arora1, M. Shao1, S. Turyshev1, L. Friedman8 ,P. C. Brandt3, R. McNutt3, G. Hallinan2, R. Mewaldt2, J. Bock2, M. Brown2, J. McGuire1, A. Biswas1, P. Liewer1, N. Murphy1, M. Desai4, D. McComas5, M. Opher6, E. Stone2, G. Zank7, 1Jet Propulsion Laboratory, Pasadena, CA 91109, USA, 2California Institute of Technology, Pasadena, CA 91125, USA, 3The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA,4Southwest Research Institute, San Antonio, TX 78238, USA, 5Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA, 6Boston University, Boston, MA 02215, USA, 7University of Alabama in Huntsville, Huntsville, AL 35899, USA, 8Emritus, The Planetary Society. Figure 1: A SGL Probe Mission is a first step in the goal to search and study potential habitable exoplanets. This figure was developed as a product of two Keck Institute for Space Studies (KISS) workshops on the topic of the “Science and Enabling Technologies for the Exploration of the Interstellar Medium” led by E. Stone, L. Alkalai and L. Friedman. Introduction: Recent data from Voyager 1, Kepler and New Horizons spacecraft have resulted in breath-taking discoveries that have excited the public and invigorated the space science community. Voyager 1, the first spacecraft to arrive at the Heliopause, discovered that Fig. 2. Imaging of an exo-Earth with solar gravitational Lens. The exo-Earth occupies (1km×1km) area at the image plane. Using a 1m the interstellar medium is far more complicated and telescope as a 1 pixel detector provides a (1000×1000) pixel image! turbulent than expected; the Kepler telescope According to Einstein’s general relativity, gravity discovered that exoplanets are not only ubiquitous but induces refractive properties of space-time causing a also diverse in our galaxy and that Earth-like exoplanets massive object to act as a lens by bending light.