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KBO encounters
HSchirmer
post Jan 11 2019, 09:11 PM
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QUOTE (HSchirmer @ Jan 11 2019, 03:42 PM) *
Found some prior info about NH using at Pluto expecting to use radar from Arecibo

Transmission, in a word wow
The observatory has four radar transmitters, with effective isotropic radiated powers of 20 TW (continuous) at 2380 MHz, 2.5 TW (pulse peak) at 430 MHz, 300 MW at 47 MHz, and 6 MW at 8 MHz.

I never realized Arecibo could hit 20 terawatts at the 12cm wavelength, was that an upgrade for near-earth-asteroid searches?!?
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scalbers
post Jan 12 2019, 03:11 PM
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QUOTE (WTW @ Jan 11 2019, 08:05 PM) *
TheSkyNow is not really indicative of what a deeper, more sensitive digital survey "looks like" -- where things like saturation and blooming of CCDs become worse, due to longer exposure times, CCD thermal and read noise and shot noise become problematic, images of individual objects can fall into the boundaries between CCD cells, etc. etc.

True enough. Here's a loosely related example of a Zooniverse search project for new distant and/or moving objects that has digital imagery, though using an IR detector.


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siravan
post Jan 12 2019, 03:23 PM
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QUOTE (HSchirmer @ Jan 11 2019, 04:11 PM) *


This is the effective isotropic power, i.e., it assumes that the radiation was emitted uniformly in all directions. Arecibo emits a very narrow beam, so the actual power is this number multiplied by the ratio of the beam area in steradian to 4pi.
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fredk
post Jan 12 2019, 07:09 PM
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And of course Arecibo is limited to roughly the celestial equator, while NH is well south of that at around -20 deg Dec.
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