Peter Birtwhistle

@J95_Peter

Keeping an eye on nearby space rocks

West Berkshire, England
Vrijeme pridruživanja: prosinac 2015.

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  1. 20. ruj 2019.

    C/2019 Q4 (Borisov) taken with exactly same equipment and exposure shows noticeably more tail activity this morning than 12 days ago (inset), only 7% closer to Sun 2.67 AU today, down from 2.85 AU on Sept. 8. Perihelion at 2.0 AU in December.

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  2. 12. ruj 2019.

    New (probably interstellar) Comet C/2019 Q4 (Borisov) on Sept. 8, showing a slightly fuzzy coma and just the hint of a tail to the top right.

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  3. 3. kol 2018.

    Just a 15 minute window this morning between the comet rising over rooftops & twilight getting too bright, maybe my last chance to get what is left of Comet C/2017 S3 (PanSTARRS). Aug 03 02:21 UT, 0.48 AU from Sun, 0.78 AU from Earth, elong 27.3°, alt 10°, Sun 15° below horizon.

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  4. 1. kol 2018.

    Comet C/2017 S3 (PanSTARRS) from the middle of second outburst on July 17 to disintegrating diffuse cloud on Aug 01 02:25 UT when it was 0.53 AU from the Sun, at an elongation of 31.5°, altitude 15° and the Sun 15° below horizon.

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  5. 8. ožu 2018.

    NEO 2018 CB passed within 5.5 Earth diameters on Feb. 9th. The lightcurve shape evolves rapidly as phase changes from gibbous to crescent. See how the weak secondary peak at phase 0.2 becomes as bright as the main peak. Equivalent Moon phase shown to help visualise phase angle.

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  6. proslijedio/la je Tweet
    7. sij 2018.

    RIP Thomas J. Bopp (1949-2018), co-discoverer of comet Hale-Bopp in 1995 (with Alan Hale)

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  7. 28. lis 2017.

    Interstellar interloper A/2017 U1 now getting v faint, last night about 300,000 times fainter than the mag +8 star to the west

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  8. 3. kol 2017.

    2017 MB1 NEO. Unconfirmed poss. v.faint, thin, straight tail in pa 260°, see CBET 4415 . PsAng=Anti-solar direction

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  9. 18. lip 2017.

    C/2017 K2 showing possible traces of asymmetric dust coma at 15.9 AU from Sun

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  10. 13. lip 2017.

    C/2017 K2 excess FWHM of 1.7" over nearby field star of similar brightness equates to ~20,000 km diameter at distance of 15.9 AU

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  11. 13. lip 2017.

    C/2017 K2 PANSTARRS positions from last night show how uncertain P still is, gen solution suggests anywhere between 2,000 and 70,000 years

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  12. 5. velj 2017.

    Big NEO passed just south of Aldebaran tonight. Didn't need telescope, just handheld smartphone through a pair of 20x80 binoculars

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  13. 1. stu 2016.

    Newly discovered NEO 2016 VA disappears from view, passing through Earth's shadow between 23:24-23:35 UT on Nov 01, just 0.3 LD from Earth.

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  14. 9. lis 2016.

    Another drift scan occultation recorded today, by (268) Adorea. Inset animation is 3x10 sec exposures before & just after event

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  15. 16. ruj 2016.

    Not much to look at but lots of interest in similarity to C/1915 R1 (Mellish) 101 years ago

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  16. 2. ruj 2016.

    Comet C/2016 Q4 (Kowalski) - another distant but apparently active comet. See

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  17. 1. ruj 2016.

    Now 3 consecutive nights of Comet 174P/Echeclus outburst

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  18. 31. kol 2016.

    174P/Echeclus outburst showing expanding coma over 24 hours

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  19. 27. kol 2016.

    Near Earth Asteroid 2016 QA2 caught at closest approach, taking 30 seconds to pass across field of view

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  20. 16. kol 2016.

    Disc.by LINEAR Oct'15, asteroidal but with a comet-like orbit. Hidetaka Sato found cometary activity, confirmed here

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