Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical and Infrared Photometry of SN 2005df   We present optical BVRI and near-infrared YJHK_s photometry of the normal
Type Ia supernova 2005df, obtained with the CTIO 1.3-m and 0.9-m telescopes.
The B- and V-band photometry, S-corrected to the filter prescriptions of
Bessell(1990), matches the corresponding photometry from the ANU published by
Milne et al. (2010). The R-band photometry from CTIO and ANU matches well
without any corrections. A combination of V-band and near-IR photometry shows
that SN 2005df is unreddened in its host galaxy. Spectropolarimetry of this
supernova was obtained with the VLT, and the distance to the host galaxy is
being determined from observations of Cepheids using the Hubble Space
Telescope.

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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph