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Telescope Functions

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Telescope Functions. 1 Gather Light. Gather Light. 9x ... depends on size of instruments and size of telescope. focus always in the same place ... – PowerPoint PPT presentation

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Title: Telescope Functions


1
Telescope Functions
  • 1 Gather Light

2
Gather Light
How much more light does the bigger telescope
gather? pr2
9x
3
Telescope Functions
4
Telescope Functions
5
Telescope Functions
6
Telescope Functions
  • 1 Gather Light r2

2 Resolution
7
Resolution
8
Telescope Functions
  • 1 Gather Light r2
  • 2 Resolution q
  • A aperture

k l
A
9
Resolution
10
Telescope Functions
  • 1 Gather Light r2
  • 2 Resolution q
  • 3 Magnification

k l
A
11
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12
Refraction
smooth carpeted smooth
fast
slow
fast
13
Refraction
fast slow fast
14
Refraction
fast
slow
fast
15
Refractors
16
Refractors
Focus
17
Refractors
18
Reflectors
19
Reflectors
Central Obstruction
12 Refractor 12 Reflector Which gathers more
light?
20
tight space room moves around drinks spill
21
very high
22
closer to ground shorter telescope smaller dome
23
multiple instruments easily changed at a moments
notice depends on size of instruments and size
of telescope
Nazysmith
24
focus always in the same place one heavy
instrument
25
Telescope Functions
  • 1 Gather Light
  • 2 Resolution
  • 3 Magnification

26
Resolution
  • size
  • chromatic aberration
  • spherical aberration
  • seeing

27
Chromatic Aberration
28
Acromats
Reduce Chromatic Aberration
29
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30
Spherical Aberration
31
Parabolic Mirror
32
Seeing
33
Seeing
34
Seeing
warm surface heats air hot air rises causes stars
to twinkle mountaintop observatory above
inversion layer no heat sources in observatory
35
Seeing
Which is warmer on a sunny day, air or
water? Since air is warmer, how can cold water
warm air? stable air over water during
day daytime observatories surrounded by
water solar observatory
36
Seeing
37
Seeing
Which is warmer at night, air or water? Solar
observatories are terrible for nighttime
use. seeing/time beach cruise
38
Resolution
  • seeing
  • adaptive optics

39
Refractor
Reflector
shorter smaller housing spherical
aberration parabolic mirrors still cheaper UV
astronomy adaptive optics
gathers more light chromatic aberration acromats v
ery expensive
40
Telescope Mount / Resolution
  • altitude-azimuth
  • stability
  • equatorial
  • tracking

41
Alt-Az
42
Alt-Az
43
Alt-Az
44
Alt-Az
45
Equatorial
46
Equatorial
47
Equatorial
48
Equatorial
49
Equatorial
50
Equatorial
51
Equatorial
52
Equatorial
53
Equatorial Alt-Az
54
Radio Telescopes
  • resolution

55
Radio Telescopes
  • resolution

56
Radio Telescopes
  • resolution

57
Radio Telescopes
  • resolution

58
Radio Telescopes
  • resolution

59
Radio Telescopes
  • resolution

60
Radio Telescopes
  • resolution

61
Radio Telescopes
  • resolution

62
Radio Telescopes
  • resolution

63
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64
Radio Telescopes
  • arrays
  • interferometry

65
Radio Telescopes
  • arrays

66
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67
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68
Instrumentation
image spectrum brightness
69
Image
photochemical digital
70
Photochemical
  • glass plates
  • exposure time
  • processing time
  • scanning time
  • dark room
  • chemicals
  • disposal
  • archives

71
DigitalCCDCharge Coupled Device
  • single chip
  • exposure time
  • download time
  • liquid nitrogen
  • archives
  • maintenance

72
Spectrum
Take Notes at Telescope Record Image Analyze
Image Later
73
Brightness
Hipparchus magnitude
brighter than 1st
fainter than 6th
logarithmic Five magnitudes lower means one
hundred times as bright.
74
Photometer
75
Photometer
76
Photometer
Light Pollution
77
Photometer
78
CCD
79
(No Transcript)
80
(No Transcript)
81
(No Transcript)
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