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README.md
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base_model:
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- nasa-impact/nasa-smd-ibm-v0.1
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pipeline_tag:
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tags:
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- astronomy
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- uat
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- KAILAS-v02
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widget:
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---
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# KAILAS
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- en
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base_model:
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- nasa-impact/nasa-smd-ibm-v0.1
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pipeline_tag: text-classification
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tags:
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- astronomy
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- uat
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- KAILAS-v02
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widget:
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- text: >-
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Solar Observations by Angelo Secchi. I. Digitization of Original Documents
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and Analysis of Group Numbers over the Period of 1853-1878. Angelo Secchi,
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an Italian Jesuit and prominent scientist of the 19th century, and one of
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the founders of modern astrophysics, observed the Sun regularly at the
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Collegio Romano in Rome, Italy, for more than 25 yr. Results from his
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observations are reported in articles published in the scientific journals
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of the time, as well as in drawings and personal notebooks that are stored
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in the historical archive of the Istituto Nazionale di Astrofisica
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Osservatorio Astronomico di Roma. The latter material, which reports solar
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observations performed from 1853-1878, includes original documents from
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Secchi and from a few of his close collaborators. The above unique material
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has recently been digitized for preservation purposes and for allowing the
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scientific exploitation of data not easily accessible so far. A total of
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more than 5400 digital images have been produced. Here we present the
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archival material and the new digital data derived from it. We also present
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results obtained from our primary analysis of the new digital data. In
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particular, we produced new measurements of the group number from 1853-1878,
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which will be available for future recalibration of the group number series.
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example_title: Solar Observations by Angelo Secchi
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- text: >-
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Disk-resolved Photometric Properties of Pluto and the Coloring Materials
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across its Surface. A multiwavelength regionally dependent photometric
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analysis of Pluto's anti-Charon-facing hemisphere using images collected by
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New Horizons' Multispectral Visible Imaging Camera (MVIC) reveals large
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variations in the absolute value and spectral slope of the single-scattering
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albedo. Four regions of interest are analyzed: the dark equatorial belt,
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Pluto's north pole, nitrogen-rich regions, and the mid-latitude terrains.
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Regions dominated by volatile ices such as Lowell Regio and Sputnik Planitia
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present single-scattering albedos of ∼0.98 at 492 nm, almost neutral across
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MVIC's visible wavelength range (400-910 nm), indicating limited
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contributions from tholin materials. Pluto's dark equatorial regions,
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informally named Cthulhu and Krun Maculae, have single-scattering albedos of
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∼0.16 at 492 nm and are the reddest regions. Applying the Hapke radiative
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transfer model to combined MVIC and Linear Etalon Imaging Spectral Array
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(LEISA) spectra (400-2500 nm) of Cthulhu Macula and Lowell Regio
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successfully reproduces the spectral properties of these two regions of
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dramatically disparate coloration, composition, and morphology. Since this
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model uses only a single coloring agent, very similar to the Titan-like
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tholin of Khare et al., to account for all of Pluto's colors, this result
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supports the Grundy et al. conclusion that Pluto's coloration is the result
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of photochemical products mostly produced in the atmosphere. Although cosmic
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rays and extreme ultraviolet photons reach Pluto's surface where they can
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drive chemical processing, observations of diverse surface colors do not
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require different chemical products produced in different environments. We
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report a correction scaling factor in the LEISA radiometric calibration of
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0.74 ± 0.05.
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example_title: Photometric Properties of Pluto
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---
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# KAILAS
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