# Solar System objects statistics

[![en](https://img.shields.io/badge/lang-en-red.svg)](README.md)
[![ru](https://img.shields.io/badge/lang-ru-green.svg)](README-ru.md)

* Near-Earth objects and Potentially Hazardous Asteroid statistics
![NEOs and PHAs cumulative statistics](./neo_pha_graph-2002.png "NEOs and PHAs cumulative statistics")
![PHAs cumulative statistics with successfully predicted asteroid impacts](./pha_graph_predicted_impacts-2002.png "PHAs cumulative statistics with successfully predicted asteroid impacts")
Data source: [NASA Center for NEO Studies and IAU Minor Planet Center, discovery statistics](https://cneos.jpl.nasa.gov/stats/)  
Code: [python script for plotting graph with statistics of near-Earth objects](../../src/astrodata/solarsystem/plot_neos_population_graph.py)
* Close approaches and radar detections (marked blue)
![Asteroid close approaches at a distance of up to 1.79 LD](./asteroid-close-approaches-1.79ld-ru.png "Asteroid close approaches at a distance of up to 1.79 LD. Close approaches marked blue are radar detections")
Data source: [Small-Body DataBase (SBDB) Close-Approach Data API](https://ssd-api.jpl.nasa.gov/doc/cad.html),
[data query for D < 1.1 lunar distances after 2020-03-01 to H < 30 sorted by absolute magnitude H (mag)](https://ssd-api.jpl.nasa.gov/cad.api?dist-max=1.1LD&date-min=2020-03-01&h-max=30&sort=h).
[Asteroid close approaches at a distance of up to 1.1 LD](./asteroid-close-approaches-1ld-ru.png)
See also [list of asteroid close approaches to Earth](https://en.wikipedia.org/wiki/List_of_asteroid_close_approaches_to_Earth)  
Code: [python script for plotting a chart with close asteroid approaches](../../src/astrodata/solarsystem/plot_close_approaches.py)
* Distribution of Solar System bodies by average distance to Sun
![Distribution of minor planets by semi-major axis between Venus and Jupiter](./mpcorb-hist-a0.7-5.4.png "Distribution of minor planets by semi-major axis between Venus and Jupiter (histogram of 8000 bins)")
![Distribution of minor planets by semi-major axis beyond Neptune](./mpcorb-hist-a29-70.png "Distribution of minor planets by semi-major axis beyond Neptune (histogram of 900 bins)")
Data source: [IAU Minor Planet Center, The MPC Orbit (MPCORB) Database](https://minorplanetcenter.net/iau/MPCORB.html),
[break down of amateur discoveries](https://minorplanetcenter.net/iau/special/AmateurDiscoveries.txt)  
Code: [python script for plotting histograms with the distribution of Solar system objects along the semimajor axis](../../src/astrodata/solarsystem/plot_mpcorb_hist.py)
* Distribution of largest trans-Neptunian objects by absolute magnitude H
![Distribution of largest numbered and unnumbered trans-Neptunian objects by absolute magnitude H](./tno-a-h-ru.png "Distribution of largest numbered and unnumbered trans-Neptunian objects by semi-major axis and absolute magnitude H")
See [version for only numbered trans-Neptunian objects](./tno-a-h-numbered-ru.png).  
![Distribution of largest numbered trans-Neptunian objects by delta v](./tno-a-deltav-numbered-ru.png "Distribution of largest numbered trans-Neptunian objects by semi-major axis and delta v")
Data: [MPC Web Service output as JSON file](../../data/solarsystem/tno-largest.json).
For parameters of unnumbered trans-Neptunian objects see [MPC Database Search](https://minorplanetcenter.net/db_search)  
Code: see [MPC Web Service, mpc-fetch.py](https://minorplanetcenter.net/web_service/)
* Distribution of minor planets by delta-v and travel time
![Distribution of minor planets by delta-v in semimajor axis range between 0.6 and 2.9](./mpcprb-deltav-a0.6-2.9-ru.png "Distribution of minor planets by delta-v in semimajor axis range between 0.6 and 2.9 with marked spacecraft targets")
![Distribution of minor planets by travel (transit) time in semimajor axis range between 0.6 and 2.9](./mpcprb-tt-a0.6-2.9-ru.png "Distribution of minor planets by travel (transit) time in semimajor axis range between 0.6 and 2.9 with marked spacecraft targets")  
See [Ultra-low delta-v objects and the human exploration of asteroids (2011)](https://ui.adsabs.harvard.edu/abs/2011P%26SS...59.1408E/abstract).  
Code adapted from [A Delta-V map of the known Main Belt Asteroids (2018)](https://ui.adsabs.harvard.edu/abs/2018AcAau.146...73T/abstract),
[pdf](https://planet4589.org/jcm/pubs/sci/papers/2018/Taylor18.pdf), see [Main_Belt_Code_V3.py file from Dataverse](https://dataverse.harvard.edu/dataverse/ElvisMBA),
[Earth-Approaching Asteroids as Targets for Exploration. Shoemaker, E.M. and Helin, E.F., 1978, NASA CP-2053, pp. 245-256 (1978)](https://ntrs.nasa.gov/api/citations/19780021079/downloads/19780021079.pdf)

## Image optimization applied

* [Scour](https://github.com/scour-project/scour)
* [TinyPNG: WebP, PNG, JPEG optimization](https://tinypng.com/)

For all Solar System objects related code see [this directory](../../src/astrodata/solarsystem/)