Some physical properties of a new Jupiter-family comet P/2019 LD2 (ATLAS) from broadband observations

Borysenko, S. A.; Кохирова, Г. И.; Rakhmatullaeva, F. Dzh.

doi:10.1016/j.icarus.2021.114752

Cited by 1 publication

(2 citation statements)

References 26 publications

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“…This is slightly less than that found in the previous study but may be expected as the variation in Afρ from night to night for P/ 2019 LD2 (ATLAS) was found to be substantial in this study and by Bolin et al (2021). Borysenko et al (2022) found Afρ to vary between 230 cm and 272 cm between 2020 August 6 to August 13 at 4.59 au in the R and V filters with an average of Afρ = 256 ± 15 cm in five observations. Using the data we obtained with ATLAS from 2020 August 6 to August 13, we calculate A(0°) fρ = 220 ± 19 cm.…”

Section: P/lemmoncontrasting

confidence: 83%

“…It is the product of the grain albedo, A, the filling factor of the grains within the aperture, f, and the linear radius of the photometric aperture on the sky at the comet, ρ. We use ρ = 10,000 km in our measurements as this is consistent with the radii chosen by previous investigators and is the standard scale used for JFC comae, e.g., Lin (2023) and Borysenko et al (2022). The majority of our measurements were made at geocentric distances < 4 au, giving an aperture radius of >3 5.…”

Section: Afρmentioning

confidence: 80%

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Dust Production Rates in Jupiter-family Comets: A Two Year Study with ATLAS Photometry

Gillan,

Fitzsimmons,

Denneau

et al. 2024

Planet. Sci. J.

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Jupiter-family comets (JFCs) exhibit a wide range of activity levels and mass loss over their orbits. We analyzed high-cadence observations of 42 active JFCs with the wide-field Asteroid Terrestrial-impact Last Alert System (ATLAS) in 2020–2021. We measured the dust production rates of the JFCs using the Af ρ parameter and its variation as a function of heliocentric distance. There is a tendency for our JFC sample to exhibit a maximum Af ρ after perihelion, with 254P/McNaught and P/2020 WJ5 (Lemmon) having their maximum Af ρ over a year after perihelion. On average, the rate of change of activity postperihelion was shallower than preperihelion. We also estimated the maximum mass-loss rate for 17 of the JFCs in our sample, finding 4P/Faye to be the most active. We present a subset of comets whose measured Af ρ have been interpolated and extrapolated to a common distance of 2 au preperihelion and postperihelion. From these measurements we found no correlation of intrinsic activity with current perihelion distance. For three of the JFCs in our sample, 6P/d’Arrest, 156P/Russell–LINEAR, and 254P/McNaught, there was no visible coma but a constant absolute magnitude, which we attribute to a probable detection of the nucleus. We derived upper limits for the nuclear radii of ≤2.1 ± 0.3 km, ≤2.0 ± 0.2 km, and ≤4.0 ± 0.8 km, respectively. Finally, we found that 4P/Faye, 108P/Ciffreo, 132P/Helin–Roman–Alu 2, 141P/Machholz 2, and 398P/Boattini experienced outbursts between 2020 and 2022.

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Section: P/lemmoncontrasting

confidence: 83%

Section: Afρmentioning

confidence: 80%