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Ursa Astronomical Association

Telescopic comet Helin-Roman-Alu - 6.11.2021 at 20.28 - 6.11.2021 at 20.49 Orimattila, Artjärvi, Tähtikallio Observation number 102506

Visibility III / V

132P / (Helin-Roman-Alu 2) (132P / 1997 N2, 132P / 1989 U1, 1989 XVI, 1989v) The periodic comet of the Jupiter family was filmed on the second night of the November 2021 work. Eleanor F. Helin, B. Roman, and Jeff Alu discovered this comet using a 0.46-meter Schmidt telescope at the Palomar Observatory on October 26, 1989. Source: GARY W. KRONKIN

COMETOGRAPHY . The comet was in its perihelion on November 13, 2021. When we photographed the comet, the brightest estimate was 14mag. We also photographed the first comet 117P / (Helin-Roman-Alu) of the discoverer group last spring on April 11, 2021. When photographing the comet was 0.8083au away, the closest it is 0.738au on October 12, 2021.

1Picture The sum of the stack by comet. Short 60 "tail at 14 o'clock, uniform comma 22". Asteroid 25727 Karsonmiller 18.7mag, motion shown. No other asteroids below 20.0 mag are shown.

3Picture. first image in the series1 L120s measured, 2021-11-06UT 18: 27: 52UT 2459525.26935JDUT 00h27m18.27s -03d42'03.2 "N14.841mag Std Dev 456.216 SNR112.434 FWHM7.173", JPL Horizon 18: 27: 52UTUT 00h27m18.24s -03d42'03.7 "T14.783 / N16.242mag.

4Picture. last image in the series11 L120s measured, 2021-11-06UT 18: 48: 50UT 2459525.28391JDUT 00h27m18.74s -03d42'02.6 "N15.059mag Std Dev 451.393 SNR114.733 FWHM6.550", JPL Horizon 18: 48: 50UT 00h27m18.72s -03d42'03.6 "T14.783 / N16.242mag.

TYC 4668-691-1 v.11.63mag stars used to calibrate brightness measurement.

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Additional information
  • Observation target
    • Comet
  • Title for the comet
    • Telescopic comet
  • Name of the observation target
    • 132P/Helin-Roman-Alu
  • Tail length
  • 60 arc seconds
  • Coma diameter
  • 22 kaarisekuntia
Technical information

Alluna RC16, C415 / 3320, Moravian G4-16000EC MkII, filter L, bin3 11 x 120s

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