Is Pluto still part of the Solar System?

ASTRONOMYWhat is it?

ASTRONOMY

*study of the universe and the celestial bodies, gas, and dust within it

*the scientific study of the universe, especially of the motions, positions, sizes, composition, and behavior of celestial objects

1. A planet is a celestial body that:

orbits around the sun is large enough to be seen has self – gravity to overcome

rigid bodily forces with hydrostatic equilibrium (has a force to hold or clear neighborhood objects around its orbit )

2. A “Dwarf Planet” is a celestial body that:

• Orbits around the Sun• Has sufficient mass for self-

gravity to overcome rigid body forces with hydrostatic equilibrium

• Small in diameter

3. All other objects except satellites orbiting the Sun shall be collectively known as “Small Solar Bodies”.

Why is Pluto demoted from being a member of the Solar System?

It lies in the dormant region called the Kuiper Belt.

It is so small that even the latest instruments find it difficult to see.

The critical blow is the discovery of UB313 in 2003 which is approximately 3000km in diameter

CHARACTERISTICS OF PLUTO

a. Named after the underworld godb. Has an average distance of 5.9 billion kilometersc. Has a diameter of 2,360 kilometersd. Has 3 satellitese. Rotates every 6.8 daysf. Gravity is 6% that of the Earth’s gravityg. Surface temperature is 233 C°

The Solar SystemP l u t o

Polaris

Dubhe

Merak

Pheoda

Megrez

Alioth

Mizar

Alkaid

BIG DIPPER

Polaris

SMALL DIPPER

CONSTELLATION* One of the 88 designated areas in the sky or the pattern of stars within its maps

ASTERISM

* Prominent pattern of stars, usually with a popular name that does not constitute a complete constellation

POLARIS (Stella Maris) California 40°

Australia not seenBaguio 16°

Cagayan 17°

Mindanao 5°

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RigelSaiph

Mintaka

AlnilanAlnitak

Betelgeuse Bellatrix

Meissa

GREAT ORION NEBULA (M42) Trapezium – multiple star system which lies at the corner of M42

NEBULA

* Cloud of interstellar gas and dust that signals the formation of stars

Magnitude* It refers to the measure of

brightness of stars. The lower the value, the brighter the star

Apparent Magnitude

* It describes how bright a star appears to be as observed from the Earth

Absolute Magnitude

* It is the measure of the actual luminosity of a star

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