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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Kiikarikomeetta Wirtanen - 3.1.2019 klo 17.35 - 3.1.2019 klo 20.56 Helsinki, Maunula Observation number 80175

Visibility III / V

Jorma Ryske, Etelä-Suomen kosmol. seura

46P/Wirtanen is receding but still quite near Earth at a distance about 0,14AU. Here in first image Wirtanen is exposed at near UV 387nm narrowband wavelength, where about 30' diameter coma is visible. In the second image Wirtanen is exposed with R filter, where short dust tail of length 4' toward PA 210° is visible.

I used CometCIEF processing (Samarasinha, N. H., Martin, M. P., Larson, S. M, 2013. Cometary Coma Image Enhancement Facility, to enhance 387nm stacked images to visualize possible rotation effect of cyanogen radical CN jets. In the third image/animation a CN jet PA is changing from ~210° to PA ~150°, about 60° clockwise during 75 minutes exposures.

Animation 1) Exposures with CN Semrock 387/15nm
- CometCIEF processed
- 5 frames each 3x300s, totalling 75 minutes, starting 2019-01-03 16:40 UTC
- CN Jet in frame 1 at PA ~210°, in frame 5 PA ~150°


Image 2) Exposures with CN Semrock 387/15nm
- 24x300s=2h bin2x2 1,68"/px
- Starting 2019-01-03 15:53 UTC

Image 3) Exposures with Astrodon R
- 30x20s bin2x2 1,68"/px
- Starting 2019-01-03 15:35 UTC


More similar observations
Additional information
  • Havainnon kohde
    • Komeetta
  • Kohteen nimi
    • 46P/Wirtanen
  • Pyrstön pituus
  • 4 kaariminuuttia
  • Pään läpimitta
  • 30 kaariminuuttia
  • Sää
    • -13C
  • Komeetan otsikko
    • Kiikarikomeetta
Technical information

305mm/1200mm F4 Newton - TS2Korrr 0,75x F2.9 coma corrector/reducer => 906mm focal length. QSI690wsg ccd camera (Sony ICX814). Semrock 387nm/15nm filter. Astrodon G2 E-series RGB Filters. Hutech IDAS LPS-P2, Light pollution / Continuum filter. iOptron CEM60 mount. FoV 47'x 38'.

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