[ExI] If you follow the developments with Tabby's star . .
spike66 at att.net
Thu Sep 15 01:24:50 UTC 2016
This is what is being reported today:
1276 light years
Parallax error: 0.307 mas
Distance range: 349.4 to 444.8 parsecs
Distance range: 1139.0 to 1450.0 light years
This is puzzling indeed. Before this measurement, the distance was being
reported as 454 pc:
Now that estimate is above the high end of the parallax measurement.
Help us John Clark and Anders wan Kenobi!
That means Boyajian's star (I still prefer Tabby's star, but I will get over
it) is closer than we thought, so there is more dimming than we thought, and
the dimming by mere dust becomes less likely. Reasoning: if dust around
Tabby caused the dimming, it would have more IR signature, ja?
From: extropy-chat [mailto:extropy-chat-bounces at lists.extropy.org] On Behalf
Sent: Wednesday, September 14, 2016 5:43 PM
To: extropy-chat at lists.extropy.org
Subject: Re: [ExI] If you follow the developments with Tabby's star . .
We just need to learn to call it Boyajian's star; I agree with footnote 2.
Just doing a mini-paper on the Kardashev scale, calculating the levels from
fundamental physical constants. Very entertaining if you like dimensionless
numbers to weird fractional powers (a K2 civilization has a power between
(c^5/G) alpha_G^1/2 alpha^5/2 beta^1/4 and (c^5/G)
alpha_G^1/2 alpha^-2 beta^-2 - anybody recognize what the c^5/G term is?).
On 2016-09-14 18:27, Keith Henson wrote:
> This is fairly good.
> Best wishes,
> extropy-chat mailing list
> extropy-chat at lists.extropy.org
Dr Anders Sandberg
Future of Humanity Institute
Oxford Martin School
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