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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Telescopic comet PanSTARRS - 1.4.2023 at 02.11 - 1.4.2023 at 02.40 Orimattila, Artjärvi, Viestikallio Observation number 114001

Visibility II / V

Jorma Ryske, Etelä-Suomen kosmol. seura

364P/PanSTARRS is a small comet currently about 1 AU from the Sun and very close to Earth at 0.14AU / 21 million km. Because of its proximity, the comet moves very quickly and even with short 45s exposures you had to follow the comet. The comet has a dense very small 40" / 4,000 km diameter coma and an easily distinguishable narrow 8' / 50,000 km long tail.

The image of the cyan filter (CN 387nm) shows almost no CN emission with 364P/PanSTARRS. Often, comets have already formed a large CN coma at a distance of 1 AU from the sun, but this comet does not have it for some reason.

Image 1) Clear filter, 15x45s, 2023-03-31 23:11 UT

Image/animation 2) 15 frames a 45s, 2023-03-31 23:11 UT

Figure 3) CN 387nm/15nm filter image 6x180s, 2023-03-31 23:25 UT

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Additional information
  • Observation target
    • Comet
  • Visibility of the comet
    • Telescopic comet
  • Name of the observation target
    • 364P/PanSTARRS
  • Brightness in magnitudes
    • 14
  • Tail length
  • 8 arc minutes
  • Coma diameter
  • 40 kaarisekuntia
  • Weather
    • -5C, Moon 75%

Technical information

TS 305/1200mm Newton, TS KomakorrF4, QSI690/ICX814, filter Baader Clear, Semrock CN 387nm/15nm, mount CEM60, Viestikallio remote observatory. FoV 36' x 28'. North ~ up, east left.

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