1P/Halley scaled one in 200 thousand

This model was rendered using MATLAB R2016a on the ICQ model of the PSI made by Philip Stooke. With this model I've try a modification of the surf2stl function I use for all the models, along with the interpolation method I have described here. Like many, if not all, comets its rotation is chaotical and may change over the time, so the northern and southern hemispheres cannot be determined, and the labels "north" and "south" in the model's file names and the model inclination are arbitrary.
The file's names explained: name_1_x_10_y.stl is 1 : x * 10y. So _1_6_10_7 is 1:600000000 or one in 60 million.

1P/Halley
Halley's comet is the only naked-eye visible short periodic comet, most of the comets seen have periods of thousand of years, and most of the periodic comets are too small and faint to be seen. This comet was the first one to be identificated as periodic, by Edmond Halley, and can be tracked back to 240 BC in ancient records. Short period comets are though to be former Kuiper belt and Scattered disk objects that fall down into a highly elliptical, Jupiter resonant, orbit. They could be, but it is unusual, deorbited long period comets, which origin is in the hypothetical Oort cloud. Halley's comet has one of the biggest known nucleus of any comet. The nucleus of a comet (the solid part) is composed of water ice, dust particles and organic compounds. Arrokoth may be a prototype of a cometary body before the perturbation from another object makes it fall into a lower orbit. When any comet come close to the inner Solar System, the volatile material sublimates and creates an atmosphere, that elongates in the oposite direction of the Sun, because of the solar wind, creating the coma of the comet. The dust impulsed by the thrown material creates the tail. Comets come so close to the Sun that they could be destroyed, evaporating completely, or breaking apart into smaller pieces, that could coalesce again to a weak rubble pile or create a new comet family. A comet could eventually impact with a planets or other objects, like the comet Shoemaker - Levy 9 which collided with Jupiter after being disrupted in many pieces in a close encounter with it. Comets have unstable orbits and they cross the orbits of all the planets, so close encounters can be common. Short period comets have also relatively low inclined orbits, so the the probability of this interaction are greater. They could be responsible for various extinction events, not only because the possibility of an impact with the Earth, but because the possibility of shattering a minor planet like an asteroid that create a new asteroid family, scattering the smallest bodies like bullets through the Solar System. If a comet survives this tragic endings, it could deplete of volatile materials and became an extinct comet, that resemble an asteroid. Damocloids, asteroids with elliptic, comet-like orbits, and many Near Earth Asteroids, like Phaethon, can be extinct comets.
Type: Comet.
Orbit: Sun.
Orbital period: 75.32 yr.
Composition: Icy body.
Density: 0.6 g/cm3.
Dimensions: 15 km × 8 km
Model scale: 1:8x104 (20cm) 1:2x105 (8cm)

References
"Stooke. P., Stooke Small Body Shape Models V2.0. EAR-A-5-DDR-STOOKE-SHAPE-MODELS-V2.0. NASA Planetary Data System, 2016."
Original surf to STL function for MATLAB

Other astronomical objects



Object


Scale [1:x]
K = 103 (thousand)M = 106 (million)G = 109 (billion)


Image




Inner Solar System



Mercury
20M, 60M,
120M



Venus
60M,
120M,
250M



Earth
60M,
120M,
250M



Luna
10M, 20M,
60M



Mars
20M, 60M,
120M



Phobos and Deimos
200K,
500K




Artificial



Salyut 7
40, 48, 80, 160




Near Earth Asteroids



Moshup and Squannit
8K,
20K,
40K



Ra-Shalom
20K,
40K



Castalia
8K,
20K,
40K



Bacchus
8K,
20K



Bennu
3K,
8K



Ryugu
3K, 8K,
20K



Geographos
40K,
80K



Phaethon
40K,
80K



Itokawa
3K,
8K



Eros
80K, 200K,
500K



Nereus
3K,
8K



Mithra
20K,
40K



Golevka
8K



Toutatis
40K,
80K




Main Asteroid Belt




Gaspra
200K



Annefrank
40K,
80K



Braille
20K,
40K



Vesta
2M, 4M,
10M



Šteins
40K,
80K,
200K



Iris
2M,
4M



Hebe
1M,
2M,
4M



Lutetia
500K, 1M,
2M



Julia
1M,

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