seeing the deep-sky Bonnievale, South Africa How to get the most - - PowerPoint PPT Presentation

seeing the deep sky
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seeing the deep-sky Bonnievale, South Africa How to get the most - - PowerPoint PPT Presentation

Auke Slotegraaf Astronomical Society of Southern Africa Deep Sky Observing Section How to see the deep sky a practical workshop to help you get the most out of your telescope time Southern Star Party seeing the deep-sky Bonnievale, South


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How to see the deep sky

a practical workshop to help you get the most out

  • f your telescope time

Auke Slotegraaf

Astronomical Society of Southern Africa Deep Sky Observing Section

introduction

practical perception practical history communication practical a checklist practical

2011 March 05

Southern Star Party

Bonnievale, South Africa

seeing the deep-sky

How to get the most out of your precious telescope time

Auke Slotegraaf

ASSA Deep-sky Secon

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SLIDE 2

measurement

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SLIDE 3

introduction practical history communication practical a checklist practical

deep sky observing

astronomy as experience, in addition to measurement units

words: WOW!, ooooh! etc. ;-)

practical perception

astronomy as experience

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SLIDE 4

introduction

perception

practical history communication practical a checklist practical

deep sky observing

vision

practical

percepon

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SLIDE 5

introduction

perception

practical history communication practical a checklist practical

deep sky observing

perception is more than vision

practicalAWB

I’m a proud member of the

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SLIDE 6

percepon

A collecon of processes that organize input

  • p

h y s i c a l s

  • m

u l u s → p h e n

  • m

e n

  • l
  • g

i c a l e x p e r i e n c e .

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SLIDE 7

p h y s i c a l p h y s i

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percepon

A collecon of processes that organize input

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SLIDE 8

p h y s i c a l p h y s i

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e n e u r

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percepon

A collecon of processes that organize input

  • pcs of the eye

wavelength of light chemistry of photo-receptors

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SLIDE 9

p h y s i c a l p h y s i

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percepon

A collecon of processes that organize input

rhodopsin concentraon dark adaptaon averted vision

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SLIDE 10

p h y s i c a l p h y s i

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i c a l a ff e c

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e n e u r

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n i

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percepon

A collecon of processes that organize input

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SLIDE 11

p h y s i c a l p h y s i

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e n e u r

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percepon

A collecon of processes that organize input

aenon

  • rganizaon

atude set cognive schema learning

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SLIDE 12

“There is nothing more painful for me at this stage in my life than to walk down the street and hear footsteps and start thinking about robbery – and then look around and see somebody white and feel relieved.” — Jesse Jackson

cognive schemas

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SLIDE 13

cognive schemas

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SLIDE 14
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SLIDE 15
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SLIDE 16

cognive schemas

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SLIDE 17

Sir John Herschel & the Whirlpool Galaxy

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p h y s i c a l p h y s i

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e n e u r

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percepon

A collecon of processes that organize input

aenon

  • rganizaon

atude set cognive schema learning:

“ change in response potenality ”

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SLIDE 19

“Seeing is in some respects an art which must be learnt... Many a night have I been praccing to see, and it would be strange if one did not acquire a certain dexterity by such constant pracce.” — William Herschel, 1782

learning to see

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SLIDE 20

What kind of constant pracce should an observer embark

  • n, in order to construct a richer cognive schema, so that

the result of percepon can be a more meaningful and rewarding phenomenological experience?

learning to see

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What are your first impressions? How easy is it to see? (visibility; magnitude) What shape is the nebula? How big is the nebula? How does the brightness change (brightness profile) Is there a nuclear region? Are the edges sharp or diffuse? Are there areas of uneven brightness? How well does the nebula stand out? What colour is the nebula? Are there stars very near/within the nebula? How does it relate to the surrounding star field? Rate your confidence in this observaon.

  • bserving checklist

What are your first impressions? How easy is it to see? (visibility; magnitude) What shape is the cluster? How big is the cluster? Are individual stars seen? Are the stars concentrated towards the centre? How does the brightness change (brightness profile)? How many stars can you see? What is the range of their brightness? Is there an obvious central or other prominent star? Do any of the stars have a parcular colour? Are any of the stars double? Are there chains, rows, or clumps of stars?

nebulae star clusters

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SLIDE 22

rough sketches

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SLIDE 23

differences similaries

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communicaon

A good descripon should allow the reader to re-create a mental image

  • f what was seen

at the eyepiece.