The WISE 3-Band Cryo Data Release products are comprised of data taken during the mission's 3-Band Cryo survey phase. This phase covers the time following the exhaustion of solid hydrogen in the WISE payload outer cryogen tank, while the detectors and telescope were still cooled by the inner cryogen tank. During this time, WISE's W1, W2 and W3 bands were operational and continued to acquire useful data, but the W4 detector was saturated by thermal emission from the warming telescope. The sensitivity achieved in the W1 and W2 bands was similar to that during the full cryogenic mission phase. The W3 measurement sensitivity was degraded and decreased steadily during the 3-Band Cryo phase because of the increasing telescope temperature and decreasing exposure times.
The NEOWISE Post-Cryo Data Release products were generated using data taken during the mission's Post-Cryo survey phase. This phase covers the time following the exhaustion of solid hydrogen in the WISE payload inner cryogen tank, when the detectors and optics gradually warmed until they reached a stable equilibrium temperature near 73.5 K (VIII.1.a.i). During this time, WISE's W1 and W2 detectors continued to acquire high quality imaging data with sensitivities close to that during the mission's cryogenic survey phases. The W3 and W4 detectors were fully saturated by the thermal emission from the warming telescope.
WISE scanned approximately 70% of the sky during the Post-Cryo survey phase continuing with the same strategy that was used during the full cryogenic survey. WISE scanned along lines of constant ecliptic longitude from near one ecliptic pole to near the other pole with a scan rate close to the orbital rate of 3.8 arc-minutes/second in order to always point away from the Earth. Each semi-circular track from ecliptic pole to ecliptic pole is called a scan. During each scan WISE took a frameset every 11 seconds. Each Post-Cryo frameset contains two images, one for each of the W1 and W2 bands, both observing the same 47x47 arc-minute square patch of sky.
The NEOWISE Post-Cryo Preliminary Data Release contains 3.4 and 4.6 um (W1 and W2) Single-exposure image and extracted source data that were acquired by Wide-field Infrared Survey Explorer (WISE; Wright et al. 2010) following the exhaustion of solid hydrogen in the satellite's payload inner and outer cryogen tanks. During this period, known as the NEOWISE Post-Cryo survey phase, the WISE optics and focal plane assemblies warmed to 73.5 K, and the W1 and W2 HgCdTe detectors continued to operate with sensitivities close to those achieved during the full cryogenic mission phase. No useful data were obtained by WISE's 12 and 22 um Si:As detectors because of the higher temperatures. WISE scanned approximately 70% of the sky during the Post-Cryo phase, completing a survey of the inner Main Asteroid Belt, and a second coverage epoch of the inertial sky.
The Near-Earth Object Wide-field Infrared Survey Explorer Reactivation Mission (NEOWISE; Mainzer et al. 2014, ApJ, 792, 30) is a NASA Planetary Science Division space-based survey to detect, track and characterize asteroids and comets, and to learn more about the population of near-Earth objects that could pose an impact hazard to the Earth. NEOWISE systematically images the sky at 3.4 and 4.6 μm, obtaining multiple independent observations on each location that enable detection of previously known and new solar system small bodies by virtue of the their motion. Because it is an infrared survey, NEOWISE detects asteroid thermal emission and is equally sensitive to high and low albedo objects.
The NEOWISE 2015 Data Release is the first annual release of Single-exposure data, and contains all observations from the first year of survey operations, 13 December 2013 to 13 December 2014 UTC. NEOWISE scanned the sky nearly two complete times during this period, accumulating 24 or more independent exposures on each point on the sky.
The 2015 NEOWISE Release data products include single-exposure Images - 2,497,867 calibrated 1016x1016 pix @2.75"/pix FITS image sets for the individual 7.7 sec W1 and W2 NEOWISE survey exposures. Each image set consists of two intensity images, noise maps, and bit-masks indicating pixel use status, one each for the W1 and W2 bands.
These spectra are optical follow-up observations of the
X-ray sources detected in the 942 ks exposure of the
Chandra Deep Field-South (CDFS) using FORS.
WFAU, Institute for Astronomy, University of Edinburgh
Description:
This service hosts the public releases of the ATLAS Survey housed at the Wide Field Astronomy Unit at the Univeristy of Edinburgh, as well as a number of other external datasets for which WFAU has neighbour tables, that can be cross matched with ATLAS. The initial aim of ATLAS is to survey 4500 deg2 of the Southern Sky at high galactic latitudes to comparable depths to the SDSS in the North. The VST ATLAS will be the first step towards a panoramic digital survey of the Southern Sky in the optical bands. The ATLAS will complement the proposed VISTA Hemisphere Survey in the South.
PTF is a fully-automated, wide-field survey aimed at a systematic exploration of the optical transient sky. Level 1 data are processed single exposure images.
This service publishes plate scans of the Palomar-Leiden Troian
surveys conducted between 1960 and 1977. The surveys led to the
discovery of more than 2,000 asteroids (1,800 with orbital information),
with another 2,400 asteroids, including 19 Trojans, found after further
analysis of the plates.
Note that because of the large size of the plates, in this service each
original plate is contained in two parts, marked with "_1" and "_2",
respectively. The central parts
of the two parts overlap.
SDSS DR3 - Sloan Digital Sky Survey Data Release 3
Short Name:
SDSS DR3
Date:
04 Dec 2019 13:35:52
Publisher:
WFAU, Institute for Astronomy, University of Edinburgh
Description:
This is an AstroGrid Dataset Access installation of the Sloan Digital Sky Survey (SDSS) DR3 hosted by the Wide Field Astronomy Unit (WFAU), University of Edinburgh. WFAU would like to thank John Hopkins University and the University of Chicago for permission to host the data.
