dark nebulae. 1 x 1.5 degrees barnard 33 alnitak sigma ori flame
TRANSCRIPT
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DARKNebulae
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1 x 1.5 degrees
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1 x 1.5 degrees
Barnard 33
Alnitak
Sigma Ori
Flame
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Dark dust clouds
Emission Nebulae
seen against a bright background
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0.75 x 0.5 degrees
The Running Man
Reflection Nebulae
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Milky Way
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Background star field
Bernes 142
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What is a Dust Cloud?
• Very fine "smoke" size particles, < 1 um
• Less than 1000 particles per cubic centimetre
• Light years thick
• Produced in dying stars
• Carbon, Silicon, Iron, ice, gas, organic molecules
• Very cold, 10K
• Compressed by gravity and shock waves
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E.E. Barnard
• Edward Emerson Barnard 1857-1923
• Pioneer Astrophotographer
• Famous visual astronomer
• Discovered many comets• Barnard's Galaxy - 1884 [NGC 6822]
• Amalthea - 5th moon of Jupiter - 1892
• Barnard's Star - 1916
• Barnard's catalogue of Dark Nebulae
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Barnard's Catalogue
• Based on wide field photographs, 10 x 10 deg
• Purpose built 10" f/5 refractor
• Taken from Mt Wilson, 1905, LA, California
• Hand guided 2 to 5 hour exposures
• First published 1919, with 182 objects
• Final version, 1927, with 369 object
• North of 40 degrees south
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PLATE 19 - North of Theta Ophiuchi
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B72
B68
B69
B70
B74
B77
B255
B261
B76
HIP 85340b Oph
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Barnard 68
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Barnard's E B142
Snake
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M9
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B63
B62
B72 SnakeB68
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M7
M6
M74Parrots Head
B86 - Ink Spot
B289
B283
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Barnard 86 - Ink Spot
NGC6520
HIP88384
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Barnard 87 - Parrots head
HIP88677
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M23
Lagoon Trifed
M24 star cloud
M17 SwanM16 Eagle
B92
B93
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Bernes 157
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Bernes 157 - CrA DN
NGC6723
NGC6727
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The Emu
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The Emu
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Carina Nebula
Coal Sack
Dark Doodad
CircinusDark cloud
Bernes 145
Sandqvist 169
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Dark Doodad - Musca
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Sandqvist 169 - Circinus
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Carina nebula
1 x 1.5 degrees
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Keyhole and Loch Ness
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Observing Dark Nebula
• Dark, Dry, Clear Sky
• Dark adaptation
• Wide Field - low power
• Dark nebulae stand out against large background
• Limit magnification to 1/4 aperture (mm)
• Larger apertures for smallest objects
• Binos for many objects
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Seeing Dark Nebulae
• Many are hard to see
• Relax, take your time
• Study & enjoy the whole field
• Use averted vision
• Wait! Keep looking.
• Notice shape and extent of darkening
• Notice stars on edges and around the field
• Some are subtle variations in background
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Finding Dark Nebulae
• Not in GOTO catalogues
• Become familiar with the area
• Naked eye
• Use binos
• Use charts
• Use photos
• Take photos! - wide field lens 18-135, stacked
• Use catalogues
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Observing lists
• Astronomical League Dark Nebulae Program
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Catalogues
• Barnard - 1927, to 40s, 369 objects
• Lynds - 1962, to 33s, 179 objects
- Palomar sky survey
• Bernes - 1977, all sky, 160 objects
- Palomar with Whiteoaks southern extension
• Sandqvist 1976 1977, South of 33s, 42 + 95 objects
- Palomar Whiteoaks southern extension
• Hartley 1986, South of 33s, 1101 objects
- ESO-j UK Schmidt telescope survey
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ReferencesAstronomical League https://www.astroleague.org/al/obsclubs/DarkNebulaeClub
Barnard - 1927, to 40s, 369 objects http://www.dvaa.org/AData/Barnard.html
http://www.library.gatech.edu/search/digital_collections/barnard/index.html
Lynds - 1962, to 33s, 179 objects http://heasarc.gsfc.nasa.gov/W3Browse/nebula-catalog/ldn.html
Bernes - 1977, all sky, 160 objects http://adsabs.harvard.edu/abs/1977A%26AS...29...65B
Sandqvist 1976 1977, South of 33s, 42 + 95 objects http://adsabs.harvard.edu/abs/1976A%26A....53..179S
http://adsabs.harvard.edu/abs/1977A%26A....57..467S
Hartley 1986, South of 33s, 1101 objects http://adsabs.harvard.edu/abs/1986A%26AS...63...27H