Astronomy 104
Spring 2024,
Sections 1 through 8.

These are introductory courses to astronomy, with more emphasis on active thinking than memorizing facts. The main points of this course are (1) a general understanding of astronomy, (2) what can be observed in the sky, (3) the Solar System in 103 / the stars and the Universe in 104.

ANNOUNCEMENTS


Test 3 is on Friday6, April 26.


Students must have a scantron (#16485) and a pencil (no pen) for each class.
(This adds up to ~25 scantrons for the whole semester.)



What's up in the sky?

 
Solar Cycle 25 is picking up strong now, the Sun is quite spotty now.
Click for today's look.

  Full Moon: Apr. 23, Last Quarter: May 1,
 
  New Moon: May 7, First Quarter: May 15.
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Planets:

No planets are up early night. They are only coming in the Fall.

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News

1.  Red novae are merging stars!
 2. New models of the NASA's DART impact reshaping the asteroid moon Dimorphos show that this object is 'rubble all the way down'.
3. New moons of Uranus and Neptune have been discovered.
4.
One of the stars we observe in the labs (during the winter), eta Geminorum, is orbited by two companion stars, one of which is surrounded by a recently discovered disk of dust .

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Unusual events and objects

(Students might want to ask help in how to use the coordinates, ephemerids and finder charts.)

Comet 12P/Pons-Brooks is observable at dusk (in the West, under Jupiter) with binoculars.
For a finder chart, click the 'Observable comets' link below.