Comet Mrkos, 1957 D

Kearns, C. E.

doi:10.1086/127209

PASP

1958

DOI: 10.1086/127209

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Comet Mrkos, 1957 D

C. E. Kearns¹

Abstract: The first photographs of Comet Mrkos, 1957 d taken at the Palomar Observatory were obtained with the 48-inch Schmidt on the evening of August 17, 1957. These plates showed fine filamentary structure in the long, straight tail that pointed approximately away from the sun. It was thereupon decided to obtain

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2022

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Examining the dust of the tailless Oort-cloud comet C/2020 T2

Kwon

Masiero

Markkanen

2022

A&A

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We report our new analysis of Oort-cloud comet C/2020 T2 (Palomar) (T2) observed at 2.06 au from the Sun (phase angle of 28. • 5) about two weeks before perihelion. T2 lacks a significant dust tail in scattered light, showing a strong central condensation of the coma throughout the apparition, reminiscent of so-called Manx comets. Its spectral slope of polarized light increases and decreases in the J (1.25 µm) and H (1.65 µm) bands, respectively, resulting in an overall negative (blue) slope (−0.31±0.14 % µm −1 ) in contrast to the red polarimetric color of active comets observed at similar geometries. The average polarization degree of T2 is 2.86±0.17 % for the J and 2.75±0.16 % for the H bands. Given that near-infrared wavelengths are sensitive to the intermediate-scale structure of cometary dust (i.e., dust aggregates), our light-scattering modeling of ballistic aggregates with different porosities and compositions shows that polarimetric properties of T2 are compatible with low-porosity (∼66 %), absorbing dust aggregates with negligible ice contents on a scale of 10-100 µm (density of ∼652 kg m −3 ). This is supported by the coma morphology of T2 which has a viable β (the relative importance of solar radiation pressure on dust particles) range of 10 −4 . Secular evolution of r-band activity of T2 from archival data reveals that the increase in its brightness accelerates around 2.4 au pre-perihelion, with its overall dust production rate 100 times smaller than those of active Oort-cloud comets. We also found an apparent concentration of T2 and Manx comets toward ecliptic orbits. This paper underlines the heterogeneous nature of Oort-cloud comets which can be investigated in the near future with dedicated studies of their dust characteristics.

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Examining the dust of the tailless Oort-cloud comet C/2020 T2

Kwon

Masiero

Markkanen

2022

A&A

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Comet Mrkos, 1957 D

Cited by 1 publication

References 0 publications

Examining the dust of the tailless Oort-cloud comet C/2020 T2

Examining the dust of the tailless Oort-cloud comet C/2020 T2

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