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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Telescopic comet Schwassmann-Wachmann - 8.11.2021 at 23.20 - 9.11.2021 at 00.16 Pieksämäki Observation number 102084

Visibility II / V

Timo Kantola, Ursa (Itä-Suomi)

The material flown by the Comet 29PSchwassmann-Wachmann eruption spreads and disintegrates and gradually dims. I got the apparent size of the comet's eruption cloud quite accurately 300 ". I made the previous observation of P29 885 hours ago, ie 3.10.2021 03:40 (Finnish summer time), and on October 3, I measured the apparent diameter of the eruption cloud to be 110".

Cartes gave the distance of P29 on October 3, 2021 at 03:40 (summer time) 5.4588AU = 816624857 km, and on November 8, 2021 at 23:40 (winter time) 5.0493AU = 755364529 km. With this data, I calculated that the burst cloud was 435,501 km in diameter on October 3, and the diameter on October 8, 2021 was 1098633 km, which further calculates that the cloud expands to 749,302 km / h, ie

The gif in the picture (9pcs 420sec exposures) shows that the comet wanders with the tail (?) Above packing. This is probably an "optical illusion": The Earth is just passing by a much slower (12.1km / s) comet on the inner curve side (30km / s) and compared to the stars in the background it would seem that the comet is moving to the right, even if it is actually moving to the left - that's how I nut.

On the right side of the comet wanders in the same direction about 18mag. asteroid (41919) 2000 WW156.

In Giff's last picture, vertical stripes flash, I counted that about a dozen flashers. I would guess that some of the Starlink satellite flocks launched by SpaceX on September 13, 2021 (51) were sent to the polar orbit. The image where the satellites (?) Flash is 420s the exposure, and the center of the exposure is 8/8/2021 at 10:16:51 PM UT

And a couple more stil pictures:

The second image is 9x420sek (63min)

Third the same 9x420sec image colored and last negative stretched as much as possible.

The brightest star at the top of the image is TYC 2391-632-1

Very interesting destination!

EDIT: calculated, corrected and checked maybe for the fifth time those invoices and dates - now it should be ok.



More similar observations
Additional information
  • Observation target
    • Comet
  • Title for the comet
    • Telescopic comet
  • Name of the observation target
    • 29P/Schwassmann-Wachmann
  • Brightness in magnitudes
    • 15.5
  • Coma diameter
  • 5 kaariminuuttia
Technical information

SPX300F4, ASADDM60, Atik314L + Baader MCCP, no filters.

Exposures 420sec

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