Tony Dunn

@tony873004

Orbit simulations of planets, comets, asteroids and other interesting stuff. Amateur astronomer. Bachelor's: Physics & Astro, SFSU. Riordan physics teacher.

San Francisco
Vrijeme pridruživanja: travanj 2010.

Medijski sadržaj

  1. 3. velj
  2. 3. velj
  3. 2. velj

    Newly-discovered asteroid C21VL72 passed less than 10,000 km above Earth's surface yesterday.

  4. 1. velj

    2020 BZ13 was observed by on Jan 28th. This 3-7 meter rock passed 106,000 km from Earth at a very rapid 24 km/s on January 29.

  5. 30. sij
  6. 29. sij

    Parker At Perihelion. The is at perihelion, 0.1296 AU. No manmade object has ever been this close to the Sun.

  7. 26. sij

    Galileo could have been credited with the discovery of Neptune. He saw it in 1613 while Neptune was undergoing retrograde motion around Jupiter. But he mistook it as a background star.

  8. 26. sij

    Today, breaks its previous record of 0.166 AU for closest distance to the Sun by any spacecraft. Future Venus flybys will send it even closer.

  9. 26. sij
    Odgovor korisniku/ci

    The smaller orbit is after.

  10. 25. sij
    Odgovor korisnicima

    You can use my program Orbit Simulator. Just type the name of the asteroid into the Import box. Choose a color (optional) and press Import. It retrieves its orbital data from JPL Horizons. Press Play and watch it pass Earth.

  11. 25. sij

    Newly-discovered 2020 BH6 just passed 0.2 Lunar Distances from Earth. It's slow speed allowed Earth's gravity to bend its path. The orbit of the Moon and and a few geostationary satellites are included for reference.

  12. 20. sij

    The is currently crossing the orbit of Mercury. It holds the record for closest spacecraft to the Sun. On Jan 26, it will break its old record of 0.16 AU. On Jan 29, it will set a new record of 0.13 AU.

  13. 13. sij

    Will is asteroid 165347 Philplait? 's asteroid is too dim to see in a backyard telescope. But locating it tomorrow night will be easy. It will be occulted by the rising Moon for much of the U.S. This is a view of Earth from the asteroid.

  14. 12. sij

    I just found a great YouTube on Interstellar Comet Borisov by . She makes good use of one of my animations at 6:42 😁

  15. 9. sij

    Periodic comet P/2019 Y3 (Catalina) was recently discovered by . Here is a pannable simulation that will run in your browser.

  16. 9. sij

    Newly-discovered asteroid 2020AV2 is the first known Vatira asteroid. Its orbit is completely interior to Venus' orbit. Here is an n-body simulation of this asteroid. It will run in your browser.

  17. 5. sij

    In a few hours, you will be closer to the Sun than you've ever been, and ever will be.. Earth reaches . At 23:49 PST, it will be only 147,091,143 km from the Sun (center-to-center). It will not come closer this millennium.

    Prikaži ovu nit
  18. 2. sij
    Odgovor korisnicima

    Here's a pannable version of our hyperbolic spacecraft. It will run in your browser.

  19. 25. pro 2019.

    We're only about 2 hours away from the Earth entering the Moon's penumbra, in an eclipse that will bring annularity to Singapore and Guam. Here's a simulation from

  20. 23. pro 2019.

    Voyager 2 reaches 17 light hours from the Sun today. Here is a pannable simulation of all our hyperbolic spacecraft. It will run in your browser.

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