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

Ursa Astronomical Association

Binocular comet Wirtanen - 12.1.2019 at 21.02 - 12.1.2019 at 21.34 Orimattila, Artjärvi, Tähtikallio Observation number 80890

Visibility IV / V


46P / Wirtanen NEO / Comet was filmed on the second night of the January 2019 campaign. American astronomer Carl Alvar Wirtanen discovered the comet of the Jupiter family at the Lick Observatory on January 17, 1948. Wirtanen, who has a Finnish background, became interested in astronomy at the age of 12 and built a mirror telescope while still an amateur astronomer, Wikipedia https://en.wikipedia.org/wiki/Ciki Carl Wirtanen has found 8 asteroids in addition to the comet in his name. He did his life’s work at the Lick Observatory at the University of California, Santa Cruz. The observatory is on Mount Hamilton and its most famous observation device is the James Lick 36 "(91cm) lens telescope, the world's second largest, source Wikipedia https://en.wikipedia.org/wiki/Lick_Observatory . James Lick was originally a carpenter and piano maker, quite an adventurer and later the richest man in California, source Wikipedia https://en.wikipedia.org/wiki/James_Lick . we photographed it from 0.18670au from the end.We photographed the comet with 15s, 60s, 120s exposures due to the expected wide Coma.1Picture.Average comet stack of all exposures, the camera field is not enough for the comet.
2Picture. Stack according to the stars, the movement is visible.
3Picture. the first image in the first 10 image series 15s measured from the exposure, 2019-01-12T 19: 02: 31UT 2458496.29341JDUT 08h38m17.26s + 59d18'23. "N12.1mag Std Dev 452.965, JPL Horizon 19: 02: 31UT 08h38m17.61s + 59d18 '23 .1 "T12.78mag.
4Picture. the last image in the second series of 10 images measured from the 15s exposure, 19: 33: 26UT 2458496.31488JDUT 08h38m23.60s + 59d18'13.5 "N12.0mag Std Dev 498.808, JPL Horizon 19: 33: 26UT 08h38m23.84s + 59d18'16.8" T12.78mag .
TYC 3804-261-1 v.11.97mag stars used to calibrate the brightness measurement.



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Additional information
  • Observation target
    • Comet
  • Name of the observation target
    • 46P/Wirtanen
    • Näyttävä
  • Title for the comet
    • Binocular comet
Technical information

Alluna RC16, C415 / 3320, SBIG 1001E, filter L, 10 x 120s

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