Kevin Heider

@kpheider

Astronomy, Chess, West Coast Swing Dancing, Computer Geek, INERC

Sacramento, CA
Vrijeme pridruživanja: rujan 2009.

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  1. 16. sij

    2020 AN3 (~300 meters in diameter) with a 67-day observation arc has a (1 in 200000) chance of impacting Earth on 2106-Jan-15. The nominal solution has the asteroid 7 million km from Earth on 2106-Jan-15.

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  2. 2. stu 2019.

    The small asteroid that buzzed ~6,200 km above Earth's surface on Halloween now has a wiki article:

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  3. 21. lis 2019.

    On 28 April 2017, a 2.7 cm (1 in) fragment of 2013 YT1 is suspected of having impacted Earth creating a over , Japan. The fragment would have broken off the parent body within the last ten thousand years.

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  4. 15. lis 2019.

    Precovery images of 2019 TF7 from 18 September 2019 where located, extending the observation arc to 23 days, and the object was removed from the Sentry Risk Table. On 26 June 2021 the asteroid is expected to be 4.9±2.4 au (hundreds of millions of km) from Earth.

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  5. 14. lis 2019.

    2019 TF7 (~800 meters in diameter) with a 4-day observation arc has a (1 in 67 million) chance of impacting Earth on 2021-Jun-26.

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    20. ruj 2019.

    What would make the best short descriptor for the Interstellar Comet C/2019 Q4 (Borisov)?

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  7. 19. ruj 2019.

    In interstellar space C/2019 Q4 takes roughly 9000 years to travel a light-year.

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  8. 18. ruj 2019.

    Asteroid ~15 meters in diameter impacted Jupiter on 7 August 2019.

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    17. ruj 2019.

    Both Genesis II and Tselina-D-30 (Kosmos 1300) are no longer operational. Thus, no collision avoidance maneuver can be made by either spacecraft. Hopefully, after around 4 AM EDT (08:00 UTC) tomorrow, there isn't a new debris field in a roughly 550 km Low Earth Orbit.

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  10. 16. ruj 2019.
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  11. 14. ruj 2019.

    Inbound 3 au from the Sun, C/2019 Q4 is moving 42 km/s with respect to the Sun, whereas an Oort cloud comet such as comet Elenin would only be moving 24 km/s when 3 au from the Sun.

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    11. ruj 2019.
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  13. 10. ruj 2019.
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  14. 3. ruj 2019.

    on the Sentry Risk Table since 2002 is ~700 meters in diameter. Due to the poorly constrained orbit, the orbital period ranges anywhere from 2.4 to 4.2 years. 1979 XB has a 1 in 6 million chance of impact on 2056-Dec-12.

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  15. 11. kol 2019.

    2006 QV89 was recovered in August 2019 extending the observation arc from 10 days to 12 years. The asteroid will make closest approach to Earth on 27 September 2019 at a distance of 0.0463 AU (6,930,000 km; 4,300,000 mi). It was removed from the Sentry Risk Table.

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  16. 2. kol 2019.
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    26. srp 2019.

    asked me to calculate a path of risk for . It's only a few meters across but JPL's SENTRY has it at 1 chance in 240 of impacting on Nov 2, 2020 (ESA/NEODys has it at 1 in 400). Path of risk stretches across the Pacific. Calculated with SOLEX 12.1

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  18. 22. srp 2019.

    2018 VP1 (~2 meter diameter) with a 13-day observation arc has a 0.4% chance (1 in 240) of impacting Earth on 2020-Nov-02. The uncertainty region on 2020-Nov-02 is ±4 million km and the nominal solution has it 420000 km from Earth.

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  19. 16. srp 2019.

    Based on non-observations from 4–5 July 2019, an impact by on 9 September 2019 has been ruled out.

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  20. 15. srp 2019.

    The line of variation (LOV) passes over Antarctica and the southern tip of Argentina.

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