Log Book Entry No.159

Created: 16 Jan 2018 13:18:34

Last Revised: 16 Jan 2018 13:18:34

JacobChambers

PH3010 Solar Limb Darkening SB JC SH CM AS

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11am start

Setup unchanged from previous SLD

• Camera firewire connected to main telescope with solar filters attached
• Telescope turned on and GPS fix taken
• dome doors opened and dome moved to locate position of sun
• once shadow aligned with dome, position of telescope adjusted to align with sun by observing its shadow on dome wall
• position then made more accurate by viewing sun through finder scope and adjusting to centre sun on cross-hairs
• focus corrected by moving cross-hairs to edge of sun where the contrast gradient is greatest
• manual focus by unlocking and rotating focus knob
• exposure 1/5000s, gain 1023 ?
• approx. tracking time made using speed 3 (~20s)
• approx. tracking time then made in terrestrial mode (~2min15s)
• ratio: 0.148
• tracking back to astronomical and focussed back on edge of sun on speed 3, moved 20 seconds into background
• set sequence timer up to 405 seconds (3 times the non-tracking width of the sun), start at same time as tracking stopped