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.

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  1. prije 19 sati

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

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  2. 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.

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  3. 30. sij
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  4. proslijedio/la je Tweet

    The high school I attended in San Francisco, Riordan High School, is going co-ed starting next year. Since it opened in 1949 it has been an all boys Catholic high school. Riordan joins St. Ignatius and Sacred Heart who made the switch years ago. This is me on graduation day:

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  5. 29. sij

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

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  6. 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.

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  7. 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.

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  8. 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.

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    23. sij

    Theres a new observatory opening very soon - 1 hour from Newcastle 40 mins from Durham 1.3 hours from Leeds 1.55 hours from Manchester Under superb Dark skies the countdown has started. Took this from that location in September 2019.

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  10. 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.

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  11. 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.

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  12. 13. sij

    Cool! linked to my sim in his blog about 2020 AV2, the first known Vatira asteroid.

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  13. 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 😁

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  14. 9. sij

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

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  15. 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.

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  16. 5. sij

    Unless you were born prior to 1961. Then you were 5221 km closer than now. Here are more relevant simulations. 1961 perihelion Records all perihelions into the future Records all previous perihelions.

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  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.

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    25. pro 2019.

    Et la voici vue depuis Jaffna, Sri Lanka

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  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

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  20. 23. pro 2019.

    Just finished watching The Aeronauts movie. . Really good movie imho.

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