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Magnitudes
Magnitudes Brightness
1 2.5
2 6.…read more

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Lesson 1
Open clusters: loose aggregations of dozens or hundreds of
young stars.
Globular clusters: gravitationally bound groups of thousands
or millions of very old stars
Constellations: stars are named , , , , according to
their relative brightness
The last 2 stars of the plough point up to Polaris. The handle
curves to Arcturus.
Orion's belt points up to Torus and down to Sirius.
An asterism is a recognisable group of stars that is not a
complete constellation such as the plough.…read more

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Polaris has a declination of 90. Its elevation is the same as
the latitude of the observer.
Circumpolar stars never set. I star is circumpolar if
declination > 90 - latititude.
Lesson 4
Sidereal day+ 23 hours 56 minutes
Solar day= 24 hours
Winter solstice=21s december
Autumnal equiox= 21st September
Summer solstice =21st june
Vernal equinox =21st march
Equation of time = apparent solar time- mean solar time
Solar wind: Electrically charged particles leaving the suns
corona (mostly protons and electrons).…read more

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The distance is 1 divided by the parallax angle. D=1/p
Apparent magnitude: how bright an object appears from
earth
M = m + 5 ­ 5 log d
M is the absolute magnitude
m is the apparent magnitude
d is the distance in parsecs
Inverse square law: When the distance is twice as big the
light is a quarter of the intensity.…read more

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Pluto
Ceres
Humea
Makemake
Eris
Asteroids: can be spherical or irregular and rocky or
metallic. Mostly found between mars and Jupiter.
Comets: short term ones from the Kuiper belt. Long term
ones from the oort cloud. They have very elipticle orbits.
When it is close to the sun they develop an ion trail and a
dust trail. They are both facing away from the sun.
Perihelion is when an object is closest to the sun. aphelion is
when it is furthest away.…read more

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Meteoroid: small body in space
Meteor: meteoroid colliding with earth's atmosphere
creating light trail
Meteorite: meteor that hits the ground
Lesson 12…read more

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Lesson 13
Nuclear fusion= fusing together 2 or more lighter nuclei to
produce heavier ones.…read more

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Lesson 15
Heliocentric universe = Copernicus
Retrograde motion
Keplars laws
1. Planets orbit in
ellipses, with the sun
at one focus
2.…read more

Comments

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Durre

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