KBO encounters |
KBO encounters |
Aug 2 2008, 12:53 PM
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#1
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Newbie Group: Members Posts: 6 Joined: 1-August 08 Member No.: 4280 |
Hi,
I’m regular follower of NH and I’m also interested in the 2nd leg of the mission, i.e the 2016+ KBOs encounters. Does anyone know when operations about this leg (starting with searching objects of interest with HST or some other earth-based means, I suppose) are expected to begin ? |
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Jan 9 2019, 04:54 PM
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#2
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Senior Member Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 |
Interesting question. At 50 AU the sun appears roughly 8.5 magnitudes fainter than it does from Earth, so around -18. So to have significant extra illumination from a SN, the SN would need to be at least -18th magnitude. The brightest recorded in history was something like -7.5 (SN 1006). So you'd need a SN roughly 10 magnitudes brighter than SN 1006, so one roughly 100 times closer (and hence ~10^6 times less likely). SN 1006 was at 7200 ly, so we'd need one at least as close as around 70 ly. At something like 10 SNe/year in our galaxy, we'd have to wait a very, very, very long time...
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