Presentation on theme: "Institute of Astronomy Cambridge. AGM Subscriptions from this year onwards to be aligned to financial year. Now due in January for April 2011. 50% Discounted."— Presentation transcript:
Institute of Astronomy Cambridge
AGM Subscriptions from this year onwards to be aligned to financial year. Now due in January for April % Discounted subs rate for prompt payment. Accounts show that funds are higher than needed, hence discount scheme. Additional income is due to sale of educational pamphlets and Astro Calendars. No change to subs this year. FAS would like societies to register their post codes on the FAS web site. An embedded Google map will then display all societies in a region as a pin on the map.
Institute of Astronomy
Notes 1.Greek word for Saturn is KRONOS 2.History of observing Saturn – who and when 3.Signal strength from the Cassini space craft is only 20W when it leaves – tiny fraction of that when it arrives on earth 4.Huygens probe – surface consistency (wet snow or sand), video & still photography. 5.New research using radar to probe inside Titan – may be internal oceans of water and ammonia. 6.New images from previous day showing new blue ice exposed by impact in false colour image of Rhea. 7.Cassini mission may extend to 2017, skimming just 3,000km from cloud tops before tumbling into Saturn's atmosphere.
Notes 1.100,000 years for energy to escape – drunken stagger through the woods 2.Photosphere temperature is 6000K. 3.Inside sunspots 4,000K, hence much darker. 4.Carona is 1-2M K – much hotter than the surface! 5.Cycle 23 (current) has been much longer and deeper minimum than usual: longest in a century ( years) 51 sun-spot free days. 6. Spectacular displays of erupting prominences and 3-dimensional views of coronal mass ejections using stereo. 7.Prof. Browning’s specialisation is in Re-connection of magnetic field lines.
Notes 1.Two diverse camps - divided over the influence that a strong magnetic field has over the process of star formation. Results differ by factor of 5-10: 1-2M years or 10M years. High field strength => Slower star formation Research continues from ground based telescopes 2.Collapse is rapid and chaotic, mass aggregating along filaments in the spiral arms similar to large cosmological models of galaxy formation. 3.Disc formation in young stars is visible in the infra-red. 4.Disc carries away angular momentum from the star and leads to planet formation. 5.BUT Jupiter took 10M years to from and discs last approx 3M years.
Notes 1.Dr Wheatley is a founder member of WASP, Wide Angle Search for Planets. 2.First direct images of extra-solar planets – around Formalhaut-b using Keck and Hubble. 3.Most planets found to date are ~10x M J. 4.Most planets are found by doppler wobble. 5.Very highly stable environment for measurements – fibre optic from telescope to spectrograph in basement - vibration free, N2 atmosphere, constant temp and pressure. 6.WASP uses an array of Canon telephoto lenses f/1.8 – wide angle array M stars have been surveyed to date. Computerised search for dips in brightness. 8.Most difficult data to inerpret : eclipsing binary with a 3 rd star present.
Notes 1.Team have discovered ICE GIANTS – Neptune sized planets. 2.For transit planet method, observer on earth has to be in the plane of the orbit. 3.Anomaly: M P = 10M J creates a tidal effect on parent star. They have found a 5Bn year old relationship which will end within 1M years => is it fully understood? 4.Can measure red/blue shift of the light blocked by a transiting planet – can tell which side of rotating star was hidden. 5.Also brightness and spectrum of planet before it passes behind parent star. 6.May be just 10 years away from finding oxygen rich atmosphere which would point to RESPIRATION process => LIFE !!