30 Questions
What is astronomical observation?
Detecting observational values of celestial objects or a stellar event via bare eyes or technical instruments
How did the German astronomer F.W.A. Argelander contribute to astronomical observation?
He developed a technique for observing with the naked eye
Which of the following is NOT mentioned as a method for astronomical observation in the text?
Spectroscopic analysis
What is the primary focus of the text?
The definition of astronomical observation
Which of the following statements is correct based on the information provided in the text?
Electromagnetic radiation is one of the methods used for astronomical observation
Which of the following is NOT listed as a method for astronomical observation in the text?
Telescopes
What is the primary purpose of astronomical observation?
To detect observational values of celestial objects or stellar events
Which of the following is NOT considered an observational value in astronomy?
Gravitational waves
What does the term 'proper motion' refer to in astronomical observation?
The actual motion of a celestial object through space
Which of the following observational values is directly related to the chemical composition of a celestial object?
Color (spectrum)
Which of the following methods can be used for astronomical observation?
Both naked eye observation and using technical instruments
Which of the following observational values is related to the temporal aspect of astronomical phenomena?
Time
What is the main purpose of this presentation?
To provide free educational material for undergraduate students at Istanbul University Science Faculty
Which of the following is NOT allowed with this presentation material?
All of the above are not allowed
What is the name of the course for which this presentation is prepared?
Observational Instruments & Methods
Which department at Istanbul University is this course offered for?
Department of Astronomy and Space Sciences
What is the academic title of Can Güngör, the instructor for this course?
Assistant Professor
Where did Can Güngör obtain his PhD degree?
Istanbul Technical University
What is the primary cause of light pollution?
Artificial light scattered and reflected by particles in the atmosphere
How does light pollution affect migratory birds?
It disrupts their navigation by causing disorientation
What is the unit used to measure the brightness of the night sky in astronomical observations?
Magnitude per arcsecond squared
Which of the following observatories has a better night sky brightness in the V band?
Paranal Observatory in Chile
Which of the following atmospheric effects can corrupt the quality of astronomical images?
All of the above
What is the primary purpose of studying light pollution in astronomy?
To measure the brightness of the night sky for better observations
What factor should be considered to ensure good observatory conditions in terms of aerosol size?
Size smaller than 10 microns
Which characteristic of aerosol particles negatively affects telescope mirrors?
Scattering
What unit is used to measure aerosol concentration for observatory suitability?
Aerosol index
Why is it essential for the Aerosol index to be lower than 0.5 in observatories?
To reduce mirror cleaning frequency
Besides aerosols, what other factor should be considered when choosing the location for an observatory?
Altitude
How do aerosols contribute to light pollution in observatories?
By scattering and absorbing light
Study Notes
Astronomical Observation
- Astronomical observation involves detecting observational values of celestial objects or a stellar event via bare eyes or by using technical instruments.
- Observational values include:
- Brightness (flux, count rate, etc)
- Colour (Spectrum)
- Position (RA, DEC)
- Proper motion, vertical speed
- Time
Bare Eyes Observation
- Argelander Technique was used by German astronomer F.W.A. Argelander (1799−1875) for observing celestial objects with bare eyes.
Electromagnetic Radiation
- Electromagnetic radiation includes:
- Neutrinos
- Cosmic rays
- Meteorites
- Gravitational waves
Light Pollution
- Light pollution is caused by scattered and reflected light from solid or liquid particles in the atmosphere, which obliterates the view of the night sky.
- It has adverse impacts on birds and other animals, such as disorienting migratory birds.
Choosing the Right Location for an Observatory
- Factors to consider when choosing a location for an observatory include:
- Altitude
- Meteorological conditions (cloudiness, clear sky counts)
- Absolute humidity, relative humidity
- Dust and Aerosol (solid or water particles in a gas with sizes smaller than 10 microns)
- Light pollution
- Average wind speed (and direction)
Learn about observational instruments and methods in the field of Istanbul University's Spring 2023-24 course. Please note that this presentation is intended for the education of Istanbul University Faculty of Science undergraduate students and should not be used as a scientific reference or for commercial purposes.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
