VizieR Online Data Catalog: Spitzer and WISE light curves of Neptune (Stauffer+, 2016)
Abstract
Neptune was observed between UT 2016 February 21-23 in both of the 3.6μm (IRAC-1) and 4.5μm (IRAC-2) channels of the Infrared Array Camera (IRAC) on Spitzer. The measurements were part of Director's Discretionary Time Program 12125 (PI: Stauffer).
The Astronomical Observation Requests (AORs) were made in IRAC's staring mode, where for each channel, the spacecraft is maneuvered so that the target is placed on the well-calibrated peak-up pixel and back-to-back frames taken for the total time of the AOR with no dithering. For each channel, the total duration of the AOR was set to cover a complete rotation of Neptune, or about 17.2hr. In channel 1 (3.6μm), frames with times of 100s were used (corresponding to 96.8s exposure times), resulting in 622 images (see table1); in channel 2 (4.5μm), a frametime of 30s was used (corresponding to 26.8s exposure times), resulting in 2018 images (see table2). The image files were dark-subtracted, linearized, flat-fielded, and calibrated using the S19.2 version of the IRAC pipeline. We had requested that the channel 2 observations be made immediately following the channel 1 observations, but a time-critical exoplanet transit observation was inserted between the two Neptune AORs, resulting in the channel 2 light curve beginning about 2.3 days after the start of the channel 1 observation. Flux densities were measured with aperture photometry on the Spitzer Basic Calibrated Data images. We converted aperture fluxes to magnitudes using the in-band flux densities of Vega: 278Jy (3.6μm) and 180Jy (4.5μm). The light curve data of Neptune measured with Spitzer/IRAC are provided in Tables 1 and 2. These are the first continuous Neptune light curves covering a full rotation at mid-IR wavelengths. WISE was launched on 2009 December 14 to survey the sky in four broad wavelength bands referred to as W1 (3.4μm), W2 (4.6μm), W3 (12μm), and W4 (22μm). Neptune has been observed at six different epochs in the currently available WISE and NEOWISE data releases. Its magnitudes range from W1~10.1-11.5mag, W2~9.5-11.1mag, W3~2.8-3.1mag, and W4~0.0-0.3mag. The light curve data at the WISE W1 and W2 bands are provided in Table3. (3 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- February 2017
- DOI:
- 10.26093/cds/vizier.51520142
- Bibcode:
- 2017yCat..51520142S
- Keywords:
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- Planets;
- Photometry: infrared