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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Binocular comet Wirtanen - 6.12.2018 at 20.12 Helsinki, Maunula Observation number 79696

Visibility II / V

Jorma Ryske, Etelä-Suomen kosmol. seura

46P / Wirtanen is already starting to rise a little higher in Finland. Wirtanen is now 0.1 AU from the ground and is moving quite fast relative to the stars, so the tracking was also in single exposures in a comet.

Figure 1: Wirtanen photographed from a height of about 15 ° with an IDAS filter and through an apple tree branch with exposure for 15 minutes. The diameter of the Koma here is about 6 ', the tail is weakly distinguished as the oval of the Koma in the direction PA 40 °.

Figure 2: Previous image of the IDAS filter processed by CometCIEF

Figure 3: 387nm in CN band 4x300s = 20min starting at 18:42 UT

Figure 4: Animation of 387nm CometCIEF processed images at 18:42 UT and 19:26 UT, CN to separate gas jets.

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Additional information
  • Observation target
    • Comet
  • Name of the observation target
    • 46P/Wirtanen
    • Heikosti näkyvä
  • Tail length
  • 6 arc minutes
  • Coma diameter
  • 6 kaariminuuttia
  • Weather
    • -2C
  • Title for the comet
    • Binocular comet
Technical information

TS 305 / 1200mm Newton, TS2Korrr 0.75x F2.9, QSI690, IDAS-LPS, Semrock CN 387nm / 15nm, CEM60. FoV crop 26 'x 21'. Exposures IDAS-LPS 30x30s = 15min bin1x1, 0.84 "/ px, tracking comet, starting at 6/12/2018 6:12 PM UTC. North up, east left.

Comments: 3 pcs
Tapio Lahtinen - 7.12.2018 at 10.25 Report this

Oliko sulla muuten ihan vaan guidetähtenä komeetta vai käytitkö jotain muuta ominaisuutta ?
Itse eilen illalla kokeilin PHD2:n Comet tracking-ominaisuutta mutta pilvien takia onnistumisen toteaminen oli epävarmaa.

Toni Veikkolainen - 7.12.2018 at 11.31 Report this

Kiva, että kuvaaminen onnistui. Jostain kumman syystä Järvenpään taivas oli aivan sumupilven vallassa samana iltana.

Jorma Ryske - 7.12.2018 at 23.41 Report this

Käytän guidaukseen tähteä ja PHD2:sta käytän  CometTracking-ominaisuudella. Toimivimmat parametrit CometTrackingiin olen saanut CartesDuCielistä, sen antamien parametrien kanssa pitää vaan olla etumerkkien kanssa tarkkana.

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