This is a colour-composite of the barred spiral galaxy NGC 5584. Credit: ESO: observations by Susana Randall, Claudio Melo, Swetlana Hubrig; day astronomer Dominique Naef; Henri Boffin (ESO) processed the data and made the colour-composite, and Haennes Heyer (ESO) made the final adjustments.

Violet astronomy is a lecture and an article as part of the department of astronomy course on the principles of radiation astronomy.

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Quiz

Point added for a correct answer:
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Ignore the questions' coefficients:

1 Complete the text:

Match up the violet or violet containing image with the object letter:

Sun - A

Venus - B

Earth - C

Moon - D

Mars - E

Jupiter - F

Ganymede - G

Io - H

Saturn - I

Dione - J

Titan - K

Uranus - L

Ariel - M

Miranda - N

Triton - O

Eta Carinae - P

NGC 5584 - Q

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2 True or False, Violet astronomy is the radiation astronomy over the wavelength band 380-450 nm.

	TRUE
	FALSE

3 Which of the following are radiation astronomy phenomena associated with the rocky-object Io?

	surface regions reflecting or emitting violet or purple
	an excess brightness at or near the edge
	red regions that may be phosphorus
	neutron emission
	polar coronal holes
	meteor emission
	rotation

4 Yes or No, There are violet or violet mineral containing meteorites.

	Yes
	No

5 Which of the following is not a phenomenon associated with violet astronomy?

	photographs of the planet Venus taken in 1927
	the purple haze within a few arcseconds of the central star of the Homunculus
	the faintness of carbon stars
	the stellar abundance of aluminum
	adaptive optics
	the helium beta line

6 Complete the text:

Match up the radiation letter with each of the detector possibilities below:

Optical rays - L

Visual rays - M

Violet rays - N

Blue rays - O

Cyan rays - P

Green rays - Q

Yellow rays - R

Orange rays - S

Red rays - T

multialkali (Na-K-Sb-Cs) photocathode materials .

F547M .

F675W .

broad-band filter centered at 404 nm .

F588N .

thallium bromide (TlBr) crystals .

F606W .

18 micrometers FWHM at 490 nm .

wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO) .

7 Purpurite is a natural mineral pigment composed of what likely source of violet or purple?

8 Complete the text:

Match up the radiation type with the satellite:

meteor - A

cosmic ray - B

neutral atoms - C

neutron - D

proton - E

electron - F

positron - G

neutrino - H

gamma ray - I

X-ray - J

ultraviolet - K

optical - L

visual - M

violet - N

blue - O

cyan - P

green - Q

yellow - R

orange - S

red - T

infrared - U

submillimeter - V

microwave - W

radio - X

radar - Y

superluminal - Z

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9 Why is much of the surface of Mars covered with red iron oxide dust when the rocks that compose much of its surface are blue or violet?

	Mars has been systematically bombarded with small iron-nickel meteorites or micrometeorites that oxidize in its atmosphere
	Mars has been frequently bombarded with hematite containing micrometeorites
	asteroid impacts on Mars may have forced iron from near its core into the atmosphere and onto the surface as hematite dust that oxidized
	Mars is like Earth in surface hematite composition, but Earth has much more water
	precipitation from iron-rich water

10 Complete the text:

Match up the radiation object with the likely source:

- L

- M

- N

- O

- P

- Q

- R

- S

- T

a Craters of the Moon volcano .

violet image of Venus .

active galactic nuclear region of NGC 5728 .

cosmic-ray bombardment of the Moon's surface .

blue lights from Io .

neutrino profile of the solar octant .

planetary nebula NGC 7048 .

ultraviolet image of the Earth .

a neutron star in a binary system .

Hypotheses

1. Violet radiation yields clues through clouds of what's beneath.

See also

External links

• International Astronomical Union
• NASA/IPAC Extragalactic Database - NED
• NASA's National Space Science Data Center
• The SAO/NASA Astrophysics Data System
• SDSS Quick Look tool: SkyServer
• SIMBAD Astronomical Database
• SIMBAD Web interface, Harvard alternate
• Spacecraft Query at NASA.
• Universal coordinate converter

{{Radiation astronomy resources}}{{Principles of radiation astronomy}}