The plot is fictitious; any resemblance to living or real persons is purely coincidental.
Chapter 0 - Earth

Extrasolar origin

hyperbolic orbit, orbital eccentricity of e ≈ 1.2, extremely open and curved nearly perpendicular entry to the orbital planes of the planets in the solar system at 25.5 km/s, coming from the direction of the constellation Lyra crosses the ecliptic plane on Sep 2, 2017 reaches perihelion 7 days later at a distance of 24 million km/0.16 AU from Earth on Oct 14, 2017

Chapter I - Asteroid A/2017 U1

emailTuesday, 11:30 p.m.
From:
kaiko_stefens@hawai.edu
To:
miller@neoo.com
Subject: Urgency level A-/1
IP Address
92.108.12.145

Hi Adam, This thing is strange! Verified: atypical size, axis ratio of 5:1. No thermal radiation, but extreme brightness variations with periods from 6.9 to 8.3 h. Surface is smooth, shiny metallic. Moving away rapidly, about 95,000 km per h. Preliminary classification C/2017 H19. Are you onboard?

Best regards, Kaiko

From:
miller@neoo.com
To:
kaiko_stefens@hawai.edu
RE: Subject: Urgency level A-/1
IP Address
92.108.12.145

Hey Kaiko, Are you kidding, a cigar-shaped chunk tumbling through space?! My best guess is an asteroid made of rock containing reflective metals. Btw: Congratulations, Stefens!

Kind regards, Adam

PS: Just message me if you find anything new.

“Cosmic spear” at least 400 m long, approx. 10 m wide, weighing up to 10 million tons
contains small to zero amounts of ice and water rotates around its own axis every 7.3 hours reflects light unusually brightly
Chapter II - Comet C/2017 U1

emailWednesday, 9:00 p.m.
Kaiko Stefens
Hawaii
10:25 p.m.

Hey Adam, Kaiko here. Hubble and ESO’s VLT observed a propulsion of the object that cannot be explained by gravity.

Adam Miller
Pasadena
10:36 p.m.

An anomalous acceleration?

Kaiko Stefens
Hawaii
10:47 p.m.

Its thrust decreases the farther it is from the sun.

Adam Miller
Pasadena
10:57 p.m.

The emission of gas by heat would be unthinkable for a completely inactive asteroid, but typical for a comet. What is the extent of the coma or tail?

Kaiko Stefens
Hawaii
11:08 p.m.

Negative. Neither gas nor dust envelope, no dust particle has been detected. Thus ruled out as a comet by definition.

Adam Miller
Pasadena
11:19 p.m.

Damn it, Stefens! Now you can name the thing after yourself 😜

Kaiko Stefens
Hawaii
11:29 p.m.

LOL

No characteristic comet tail acceleration of the object near the sun
calculated thrust generation: about 1 kg dust or ice per second no loss of mass can be identified
Chapter III - Nitrogen Iceberg of an “Exo-Pluto”

EmailMonday, 4:20 p.m.
Kaiko Stefens
Hawaii
5:43 p.m.

Red surface of D-type, but not even cyanide has been ascertained.

Adam Miller
Pasadena
5:54 p.m.

Maybe the object consists of matter whose evaporation is invisible to our telescopes, like solid nitrogen.

Kaiko Stefens
Hawaii
6:05 p.m.

An interstellar nitrogen iceberg?

Adam Miller
Pasadena
6:16 p.m.

Or part of one that flaked off somewhere outside our solar system from a Pluto-like planet or its crust. At perihelion, it could have melted down to a sliver.

Kaiko Stefens
Hawaii
6:26 p.m.

All the nitrogen ice in the universe wouldn’t be enough to make our object from it.

Adam Miller
Pasadena
6:37 p.m.

Also, this ejection would certainly have resulted in a different rotation.

Kaiko Stefens
Hawaii
6:48 p.m.

So false, unfortunately.

Origin unexplained object possibly traveling through space for billions of years
Pure nitrogen exists, but is rare detected on Pluto, but only 0.5% of the total mass
Chapter IV - Fluffy Cloud of Dust or Ice Fractal

EmailMonday, 9:15 p.m.
Adam Miller
Pasadena
10:40 a.m.

Maybe it’s not pushed forward like a rocket, but by solar photons?

Kaiko Stefens
Hawaii
10:51 a.m.

Then it would have to be extremely light, measured by its surface.

Adam Miller
Pasadena
11:02 a.m. local time,

Like an oversized cloud of dust and rock produced by a busted-up comet from outside our solar system.

Kaiko Stefens
Hawaii
11:12 a.m. local time,

Or maybe it isn’t three-dimensional, but an object of extremely porous structure with a “curved” dimension?

Adam Miller
Pasadena
11:23 a.m. local time,

Similar to a “fracture”, a fern leaf or a snowflake.

Kaiko Stefens
Hawaii
11:34 a.m. local time,

A hypothesis that shouldn’t be yet excluded.

object would have to be about 100 times lighter than air
Radiation pressure is a possible explanation for the non-gravitational acceleration of the object
Chapter V - Artificial Sunsail or Alien Probe

EmailSunday, 12:00 a.m.
Adam Miller
Pasadena
1:23 p.m. local time,

Instead of being porous, the object could also be very thin in order to use the radiation pressure of the sun.

Kaiko Stefens
Hawaii
1:34 p.m. local time,

It would have to be shaped like a sheet of paper, possibly rolled.

Adam Miller
Pasadena
1:45 p.m. local time,

A filigree foil, such as a sunsail, could travel a distance of 16,000 light years.

Kaiko Stefens
Hawaii
1:55 p.m. local time,

It could even survive the expected bombardment of interstellar particles without damage.

Adam Miller
Pasadena
2:06 p.m. local time,

Ergo, an artificial-extraterrestrial origin of the object could be within the realm of possibility?

Kaiko Stefens
Hawaii
2:17 p.m. local time,

Yes, acceptable given its anomalies. Even if I personally prefer a priori a more theoretically probable scenario.

Propulsion by radiation pressure messenger from an alien civilization
Alien sunsail approximate thickness from 0.3 to 0.9 mm, radius of 20 m

“I follow the maxim of Sherlock Holmes. When you have excluded the impossible, whatever remains, however improbable, must be the truth.”

Abraham Loeb
Astroid
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Malte Gruhl
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Romano Casellini
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Miqueas Aguilar Xavier Molina Eduard Fossa
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Stefan Wetterstrand
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Todd Dennie
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Dedicated to the true discoverer of 'Oumuamua', the Canadian physicist and astronomer Robert Weryk
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