3.7 apod

In this picture you get to see what earth looks like during a total solar eclipse. As you can see it appers as a big dark region. That dark spot is the shadow of the moon. THe shadow shoots across earth at about 2000 kilometers per hour. This eclipse happened during march 2006. This is the perspective of the ISS. Today is another solar eclipse this time it will be over the Atlantic ocean. 

Planetary Nebulae

cats eye nebula
It has the combined magnitude of 8.1, with high surface brightness. Its small bright inner nebula subtends an average of 16.1 arcsec, with the outer prominent condensations about 25 arcsec. Deep images reveal an extended halo about 300 arcsec or 5 arcmin across, that was once ejected by the central progenitor star during its red giant phase. In the constellation draco. 


Ring Nebula

Messier 57 is located south of the bright star Vega , which forms the northwestern vertex of the Summer Triangle asterism.M57 is an example of the class of planetary nebulae known as bipolar nebulae, whose thick equatorial rings visibly extend the structure through its main axis of symmetry. 

Right ascension	18h 53m 35.079s[1]
Declination	+33° 01′ 45.03″[1]
Distance	2.3+1.5 −0.7 kly (700+450 −200pc)[2][3]
Apparent magnitude (V)	8.8[4]
Apparent dimensions (V)	230″ × 230″[2]
Constellation	Lyra

Dumbbell Nebula. 

First nebula to ever be discovered by Charles messier. 

Right ascension	19h 59m 36.340s[1]
Declination	+22° 43′ 16.09″[1]
Distance	1,360+160 −212 ly (417+49 −65pc)[2][3]
Apparent magnitude (V)	7.5[1]
Apparent dimensions (V)	8′.0 × 5′.6[4]
Constellation	Vulpecula

Hour glass nebula 

 8,000 LY away from earth. . It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue. 

Right ascension	13h 39m 35.116s[1]
Declination	−67° 22′ 51.45″[1]
Distance	8 kly (2.5kpc)[citation needed]
Apparent magnitude (V)	13.0[1]
Constellation	Musca

Wolf-Rayet Nebula

M1-67 is the youngest wind-nebula around a Wolf-Rayet star, calledWR124, in our Galaxy. In the constellaton cygnus.

The naked eye stars Gamma Velorum and Theta Muscae as well as the most massive start, R136a1 in 30 Doradus.Wolf–Rayet stars are extremely hot, with surface temperatures in the range of 30,000 K to around 200,000 K.

Planetary Nebula Hen 1357 or the Stingray Nebulas was photographed by the Hubble Space Telescope. It is located about 18,000 light-years from Earth and lies in the constellation Ara the Altar. This expanding cloud of gas was expelled from an aging star in the nebula’s centre.

NGC 6326 Located about 11,000 ly away from earth and in the constellation of Ara. This nebula is made of ejected material.

The Helix Nebula in the constellation of Aquarius  lies about 700 light-years away, spanning about 0.8 Parsec or 2.5 light-years. 

Right ascension	22h 29m 38.55s[2]
Declination	−20° 50′ 13.6″[2]
Distance	714+88 −68 ly (219+27 −21 pc)[3]
Apparent magnitude(V)	+7.6[2]
Apparent dimensions (V)	25′[4]
Constellation	Aquarius

Eskimo Nebula

NGC 2392 lies more than 2,870 light-years away and is visible with a small Telescope in the constellation of Gemini. NGC 2392 WH IV-45 is included in the Astronomical League's Herschel 400 observing program.

Right ascension	07h 29m 10.7669s[1]
Declination	+20° 54′ 42.488″[1]
Distance	≥2,870 ly (≥880 pc)[2]
Apparent magnitude(V)	10.1[1]
Apparent dimensions(V)	48″ × 48″[3]
Constellation	Gemini
Physical characteristics
Radius	≥0.34 ly[a]
Absolute magnitude(V)	≤0.4 [b]
Notable features	–
Other designations	NGC 2392,[1] Caldwell 39, Clown Nebula,[1] Clown Face[1]

The Necklace Nebula (PN G054.2-03.4) is a 12-trillion-mile-wide (2.0 light-year-wide) Planetary Nebula located about 15,000 light-years away in the northern constellation Sagitta. The Necklace Nebula is the exploded aftermath of a giant star that came too close to its Sun-like binary companion. The embedded bright knots are dense gas clumps in the ring. 

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APOD 3.6

In this picture you can see Comet Lovejoy. Its ion tail stretches across the field of view of the telescope.This picture if from February 20th. The star filled back round is filled with with the bluish star Phi Persei and the planetary nebula of M76. This is also know as the Dumbbell nebula. Comet love joy has a greenish color. Love joy is outbound from the inner part of out solar system. its about 10 light minutes from earth. The Dumbbell nebula is over 3000 light years away. This picture captures the vastness and the beauty of our solar system.

APOD 3.5

IN this picture what you see is spiral galaxy m106. This galaxy is made up of a swirling disk of star an gas. Its appearance has blue spiral arms and red dust lanes closer to the center.  M106 glows very bright in radio waves they also emit x-rays.  An example of the closest thing to m106 is the sefert class of galaxies. This is where gas was thought to be falling through a massive black hole. M106 is only 23.5 million light years away from us. The width of is is 60 thousand light years. You can see it within the hunting dogs constellation. 

willem de sitter bio

Noah McClannahan

Mr. Percival

Astronomy

2/19/2015

Willem De Sitters Astronomer

Willem de sitters parents where named Lamoraal Ulbo de sitter and Catharine Theodore Wilhelmine Bertling. He was born on may 6 1872. The sitters had a family tradition of family members becoming lawyers. Willem decided to take a different route with his love for science and mathematics. Willem attended Secondary school in Arnhem. After he graduated he went to the University of Groningen with hopes of a degree in mathematics. While pursuing his degree he became very interested with physics and physics related experiments. He started working with Jacobus Kapteyn in the laboratory. In 1896 is when Sitters life changed. When David gill discussed the southern sky survey to Kapteyn. Sitters decided to finish his degree before leaving for Cape Town. He got his degree in 1897. He started working in Cape Town South Africa for a couple of years while participating in heliometer and photometric programs. Sitter returned to Groningen in 1899 and became an assistant in the Astronomical Laboratory and also continued to work towards his doctorate in the study heliometer observations of Jupiter's moons. In 1898 sitter married Eleonora Suermondt. Their first child was Lamoraal Ulbo was born in 1899 and died in 1901. The other children they had were Theodora, Lamoraal Ulbo, Aernout, and Agnes. Lamoraal became a geologist. Aernout was part of the Bosscha Observatory. Willem de sitter submitted his thesis on the Discussion of Heliometer Observations of Jupiter's Satellites moons in 1901. In 1913 sitter proved that the velocity of light was independent of the velocity of the source based on his observations of double start systems. In 1916 he suggested a four-dimensional space-time would fit in with cosmological models based on general relativity. Sitter found solutions to Einstein’s field of equations in the absence of matter. Sitters work led to an expedition in 1919 to measure gravitational deflection of light rays passing near the sun. Sitter was elected as President of the International Astronomical Union and served in this capacity from 1925 to 1928. In 1932 Sitter and Einstein joined together for a joint paper where they proposed a model of the universe. In the paper they mentioned dark matter which does not emit light and hasn't been detected. Even today dark matter is still a very mysterious and is a big part of what some people research today. Sitter is best known for his work on relativity. In 1929 he was working on the motions of satellites when he died. His research showed that there was varying tidal friction which affects the moon and earth. De Sitter suffered from chest complaints for several years but seemed to overcome them. However he died from pneumonia at the young age of sixty-two years in in 1934. Willem De sitter dedicated his life to the world of science and his life played a major role in the contributions to modern day physical cosmology.

Sources for bio

http://www.encyclopedia.com/topic/Willem_de_Sitter.aspx

http://www.phil-inst.hu/~szekely/PIRT_Budapest/ft/Realdi_ft.pdf

http://www.britannica.com/EBchecked/topic/546850/Willem-de-Sitter

http://www-gap.dcs.st-and.ac.uk/history/Biographies/Sitter.html

Stellar Nurseries

http://apod.nasa.gov/apod/stellar_nurseries.html



















http://www.nasa.gov/multimedia/imagegallery/image_feature_2409.html#.VNyeVubF-So