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- W4367043200 abstract "Using near-infrared observations of Neptune from the Keck and Lick Observatories, and the Hubble Space Telescope in combination with amateur datasets, we calculated the drift rates of prominent infrared-bright cloud features on Neptune between 2018 and 2021. These features had lifespans of $sim 1$ day to $geq$1 month and were located at mid-latitudes and near the south pole. Our observations permitted determination of drift rates via feature tracking. These drift rates were compared to three zonal wind profiles describing Neptune's atmosphere determined from features tracked in H band (1.6 $mu m$), K' band (2.1 $mu m$), and Voyager 2 data at visible wavelengths. Features near $-70 deg$ measured in the F845M filter (845nm) were particularly consistent with the K' wind profile. The southern mid-latitudes hosted multiple features whose lifespans were $geq$1 month, providing evidence that these latitudes are a region of high stability in Neptune's atmosphere. We also used HST F467M (467nm) data to analyze a dark, circumpolar wave at $- 60 deg$ latitude observed on Neptune since the Voyager 2 era. Its drift rate in recent years (2019-2021) is $4.866 pm 0.009 deg $/day. This is consistent with previous measurements by Karkoschka (2011), which predict a $4.858 pm 0.022 deg$/day drift rate during these years. It also gained a complementary bright band just to the north." @default.
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- W4367043200 date "2023-09-01" @default.
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- W4367043200 title "Drift rates of major Neptunian features between 2018 and 2021" @default.
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- W4367043200 doi "https://doi.org/10.1016/j.icarus.2023.115604" @default.
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