Celestial coordinates, magnitudes, parallax, spectroscopy, CCDs, radio astronomy and telescope types.
36 cards · basic cards · AI-written, checked twice. Edit anything.
- Right ascension is measured in what units?
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Hours, minutes, and seconds- What is the celestial equator?
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The great circle on the celestial sphere directly above Earth's equator- Declination is measured as an angle from which reference?
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The celestial equator, ranging from -90 to +90 degrees- In the altitude-azimuth coordinate system, what is altitude?
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The angle of an object above the observer's horizon, from 0 to 90 degrees- In the altitude-azimuth system, what is azimuth?
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The angle measured from north through east along the horizon, from 0 to 360 degrees- What is the ecliptic?
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The apparent annual path of the Sun across the celestial sphere- Galactic coordinates are defined relative to what?
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The galactic plane and the direction toward the Galactic Center- What is astronomical precession?
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A slow change in the direction of Earth's rotation axis, causing celestial coordinates to shift over time- What is apparent magnitude?
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The brightness of an object as it appears from Earth- In the magnitude system, do brighter objects have higher or lower magnitude numbers?
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Lower numbers, by a factor of 2.512 per magnitude- What is absolute magnitude?
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The apparent magnitude an object would have if placed at the standard distance of 10 parsecs- What is the distance modulus equation?
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m - M = 5 log(d) - 5, where d is distance in parsecs- What is bolometric magnitude?
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The apparent magnitude including all wavelengths across the electromagnetic spectrum- What is color index (B-V)?
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The difference in apparent magnitude between the blue (B) and visual (V) bands- The magnitude scale is logarithmic with base ____
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2.512
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