syllabus & important stuff & course links
Astronomy
Picture of the Day the
latest astrophysics discoveries
what's up in the sky this week
Skywatcher's
Diary for this month
|
Mar 21 |
Mar 22 |
Mar 23 |
Mar 24 |
Mar 25 |
|
|
|
|
the flux of light reflected to us by planets -- which we calculated in class today -- or the combined flux of stars other than the sun? and what was the temperature of the pesky light bulbs in lab D5? in calculating the effect of moonlight heating the earth, we made a mistake; we left out one factor that should have been included... what was it? |
|
|
|
|
(always done before class) |
pp 1010 - 1016 ? however, make sure to annotate your sheets with questions, comments, algebra connecting steps, etc. some other things you could read: the bombardment era [9(4) esp. pp. 217-218] the greenhouse effect [pp. 182-183] Venus vs. Earth [11(5)] global warming on Earth [8(6)] tidal forces & the regression of the moon [box 9-1 and 9(5)] |
the meaty part of the green sheet handout on explaining the origin of line spectra you should find some formulas/topics that we never dealt with in your intro physics course; make a note of them you should also note that in several places they omitted some physics effects in their formulas, because those effects are negligible you should also note that at times Walker did not do a very good job in "procedure" |
first 3 pages of Walker 11(6) on angular momentum also, the text, section 5(8), which should be a review |
|
|
| homework |
|||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
NY Times |
|
|
|
March 14 |
March 15 |
March 16 |
March 17 |
March 18 |
|
|
|
|
|
jit due by
1:30 pm have you looked up the temperature that you calculated for light bulbs in lab D5? |
prepare your ORANGE lab book |
|
|
(always done before class) |
also 19(3), although you can leave the associated box 19(3) till tuesday; know the 2 rules of magnitudes |
study the examples box 19-4 on to another example of blackbodies: the planets! begin reading chapter 7: 7(1,7,8) |
|
today's lab |
(class handout on green), pp. 1010-1016 |
| homework |
bring
to class (on paper that i could collect) a) your star's name & the spectral/luminosity class listed in the Appendix b) determine your star's temperature (in K) and its luminosity relative to the sun (from the absolute magnitude) show work! c) the radius of your star (relative to sun) [see box 19-4 and follow the procedure exactly] d) if we define the sun as fist-sized, what real life object (either bring one or have a classroom object identified) that approximately matches your star's size e) determine what fraction of your star's luminosity is emitted in the uv, in the visible, and in the ir |
to yesterday's stuff, add f) determine the wavelength of max intensity for your star AND what color your star would look to humans g) the distance to your star (based on its listed apparent and absolute magnitude); you should get close to the distance listed h) the flux (in W/m2) for your star using the distance derived in (g) |
|||
|
|
(launch the explorer; it requires java, so that must be enabled; 2 new windows should open in a minute or 2-- a useless one and one containing axes; on the latter, click on the "blackbody" button to add a blackbody, type in the temperature below the thermometer, and you'll find the %s in another new, tiny window that opens (at least that's what happened in Mozilla) |
|
|
|
|
|
|
|
|
|
we start the asteroid parallax lab ... prepare your GREEN lab book asteroid 1 asteroid 2 |
|
|
of the week |
|
|
|
|
|
March 7 |
March 8 |
March 9 |
March 10 |
March 11 |
|
|
|
jit1 answers |
|
stellar properties summary |
|
|
|
(always done before class) |
know the blackbody laws and study the examples in box 5-2 |
review 5(4) and box 5-2 flux example; new: 19(2) and box 19-2 |
on interference & diffraction (and in particular on where the equations 28-1 or 28-16 come from; you will need those equations for the lab today) |
|
on parallax and distance: know what parallax, how we measure it, and where the formula d = 1/p comes from? |
| homework |
|||||
|
|
|
learn about glow sticks |
|
|
|
|
|
|
|
bring your 2nd lab book; number thge pages, make a table of contents, etc |
(spectra lab due next thursday) |
|
|
|
the impending destruction of NGC 1427A |
ny times la times Bethe's 1967 nobel prize lecture |
|
|
| Monday, February 28 |
March 1 |
March 2 |
March 3 |
March 4 |
|
|
|
number the odd pages in your lab books |
bring a lab book with numbered pages |
bring $4 for lab books help/checks on the image processing lab during tutorial tonight, 5:30 - 7:30 pm, 4th bryan |
bring $4 for lab books | |
|
(from Universe, unless otherwise expressed) (always done before class) |
read the lab guide |
6(4) on CCDs; article from Sky and Telescope: Sky on a Chip: the Fabulous CCD |
|
|
know the three basic types of spectra and what physical states of matter produce them coming attractions: monday: 5(3-4); know the blackbody laws, and know the 3 ways that a hotter blackbody curve differs from a cooler blackbody curve |
|
|
CCDs and how they work |
|
|
||
written assignments |
10
properties (of stars) to find from spectra due today image processing lab due next tuesday |
||||
|
|
image processing lab stellar
evolution summary new browser 7 image |
lab continues you should be able to go to the T drive and follow directions... or go directly to the chandra-ed page |
|
|
|
|
|
|||||
|
|
frozen Martian sea
boosts hope of finding life on Mars Cassini @ Saturn unexpectedly large crater on Titan |
an entire galaxy of dark
matter? formaldehyde on mars? |
|
|
|