# [ExI] If you follow the developments with Tabby's star . .

spike spike66 at att.net
Thu Sep 15 01:24:50 UTC 2016

```This is what is being reported today:

391.4 parsecs
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:

https://en.wikipedia.org/wiki/KIC_8462852

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?

Cool!

spike

-----Original Message-----
From: extropy-chat [mailto:extropy-chat-bounces at lists.extropy.org] On Behalf
Of Anders
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:
> http://arxiv.org/pdf/1609.03505v1.pdf
>
> This is fairly good.
>
> Best wishes,
>
> Keith
> _______________________________________________
> extropy-chat mailing list
> extropy-chat at lists.extropy.org
> http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat

--
Dr Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University

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