April 14, 2018 – Sara’s Dark Sky Discovery Group

Kitt Peak Nightly Observing Program

Splendors of the Universe on YOUR Night!

Many pictures are links to larger versions.
Click here for the “Best images of the OTOP” Gallery and more information.

M42 The Orion Nebula

M42, the Orion Nebula is a region of star formation about 1,300 light-years away—the closest to our Solar System. It is roughly 30 light-years across, and contains enough material to make 2,000 stars the size of our sun.

M104 (Sombrero Galaxy)

M104: A spiral galaxy like the Milky Way, nicknamed the “Sombrero Galaxy” because the lane of dust in the disk looks like the brim of such a hat. It is about 50,000 lightyears across and about 29 million lightyears away.

M51 Whirlpool Galaxy

M51, the Whirlpool Galaxy, gets its name from its bright and prominent spiral arms. It lies at a distance of 23 million light-years away. It also has a smaller, companion galaxy (NGC 5195). The two galaxies are one of the best examples of interacting galaxies.    

M81 Bode’s Galaxy

M81 is a small spiral galaxy, 12 million lightyears away. It is a disk of 50 billion solar masses, only a stone’s throw (150,000 lightyears) from M82.

M82 Cigar Galaxy

M82, the “Cigar Galaxy” is an edge-on spiral galaxy, 12 million light-years away, and perhaps 37,000 light-years across. There are vast gas clouds in this galaxy, where stars are being born at an incredible rate.    

M3

M3 is a globular cluster with a half of a million stars. It orbits the core of our Milky Way Galaxy almost perpendicular to the galactic disk. It is currently 33,900 light-years away, and approaching our Solar System at 100 miles per second.

Satellites

Human technology! There are almost 500 of these in Low Earth Orbit (we can’t see the higher ones). We see these little “moving stars” because they reflect sunlight.

M37 Salt & Pepper Cluster

M37, the “Salt and Pepper Cluster” is one of three bright open star clusters in the constellation Auriga. It is the brightest and richest of the three. It lies about 4,500 light-years away, contains about 150 stars, has a diameter of about 25 light-years, and is 450 million years old.   

M46

M46 is an open star cluster containing over 500 stars. It lies at a distance of 5,400 light-years, and is about 30 light-years across. A small, faint, grey disc that seems to be superimposed over the cluster is actually the remnant of a dead star—a planetary nebula known as NGC 2438. NGC 2438 only coincidentally lies along the same line of sight as M46. The cluster and planetary nebula are unrelated; the planetary nebula is about 2,500 light-years closer to the Earth.

M1 (Crab Nebula)

M1: The Crab Nebula. The explosion that created this nebula was seen by Chinese astronomers in 1054 A.D. This explosion was bright enough to be seen in the daytime for almost a month. The nebula is 11 lightyears in diameter and is expanding at the rate of 1,500 km per second.

NGC 2392 (Eskimo Nebula)

NGC 2392: The “Eskimo Nebula.” A round cloud of gas ejected by a dying star. Since this sort of object always appears round, William Hershel named them “planetary nebulae” (he discovered this one in 1787).

NGC 2438 (in field with M46)

NGC 2438 is the glowing bubble of gas that was cast off by a single star that has died. At a distance of 2,900 light years away it is a foreground object superimposed upon the sparkling star cluster M46.

NGC 3242 (Ghost of Jupiter)

NGC 3242: The “Ghost of Jupiter.” A shroud of gas puffed off by a dying star, 1,400 lightyears away. The gas is illuminated by the collapsed, hot, blue core (a white dwarf). Did it look blue to you?

Jupiter

Jupiter is the largest planet in the Solar System, a “gas giant” 11 Earth-diameters across. Its atmosphere contains the Great Red Spot, a long-lived storm 2-3 times the size of the Earth. The 4 large Galilean satellites and at least 63 smaller moons orbit Jupiter.

Castor (α Gem)

Castor (α Geminorum) is a multiple star in the constellation Gemini, the twins. Through the telescope, a close pair of bright white stars and a more distant red dwarf companion are visible, but these are each spectroscopic binaries, making Castor a six-star system. Castor is about 50 light-years away. The bright components orbit each other with a period of about 450 years.

Winter Albireo

Two stars in Canis Major bear a striking resemblance to a pair of stars in Cygnus known as Albireo. Visible in the Northern Hemisphere summer, Albireo is a pair of stars that have very different surface temperatures, and therefore, noticably different colors. The same is try of the golden star 145 Canis Majoris, and it’s fainter, blue neighbor.

Your Telescope Operator and Guide. Thank you for joining me this evening! See you soon!!

The web page for the program in which you just participated is at
Nightly Observing Program. Most of the above images were taken as
part of
the Overnight Telescope Observing Program. For more information on this unique experience please visit Overnight Telescope Observing Program.
Copyright © 2018 Kitt Peak Visitor Center


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