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Download dg foto art gold rushSpecifications of the ZTF Observing System.
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Download dg foto art gold rushTypical stacks have at least 15 images.
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Download dg foto art gold rushIt is mounted on a tower close to the P48 dome.
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Download dg foto art gold rushWe also took care to ensure that large local galaxies were placed effectively.
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LED illuminators, and a baffled enclosure.
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ROS is hosted on a single supervisory computer (which also controls the guide and focus CCDs) and four Archon camera control computers, each of which is responsible for readout of one quadrant of four science CCDs.
Download dg foto art gold rushLEDs in each of 15 wavelengths spanning the ZTF filter bandpasses are spaced around a ring pointing toward a screen.
Download dg foto art gold rushEach image is tagged with the observing program that obtained it (public, collaboration, or Caltech), and the access permissions for all of the downstream data products are propagated accordingly.
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Because this object was discovered so early in the survey, flux is also seen in the reference image that was built from data taken over the previous nights, so we cannot constrain the explosion date exactly.
Earth Asteroids Discovered by ZTF as of 2018 April 30.
The trim plate was figured by the Nanjing Institute for Astronomical and Optical Technologies (NIAOT) in China, from a Corning fused silica blank.
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Download dg foto art gold rushEast and West edges of the CCDs where light scatters off the frames holding the field flattener lenses.
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Download dg foto art gold rushHowever, most relatively bright asteroids show a clear light curve covering an incomplete rotation (Figure 10(b)).
Kafka provides a distributed queue that is scalable to the alert volumes expected by LSST.
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Download dg foto art gold rushGuide and Focus CCDs.
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Download dg foto art gold rushGiven the differences of the ZTF system relative to potential calibrators (SDSS, PS1, Gaia), we did not attempt to match any existing filter bandpasses exactly.
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Images in r and g bands were again taken the following night.
Download dg foto art gold rushTo handle the extreme field curvature of the Schmidt focus, the dewar vacuum window is a meniscus (with a conductive ITO coating on the inner surface providing resistive heating).
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Download dg foto art gold rushIt has been designed to be able to run continuously for an extended period, while allowing human operators to monitor the system to determine its performance, track nightly errors, and reconfigure parameters if necessary.
Screening of new detections and submission to the Minor Planet Center (MPC) has been done on a best effort basis since 2018 February for those fields for which good reference images exist.
The arm then disconnects from the filter frame and stows against the wall of the telescope tube.
Figure 6 shows the limiting magnitudes obtained in all three filters over one lunation.
Download dg foto art gold rushUsing the ZTF commissioning data, we explored the variability on timescales of days to months of 83 Be star candidates in open clusters selected from Yu et al.
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Download dg foto art gold rushThe fields are aligned to cover the Galactic Plane region with the fewest pointings, improving the efficiency of both Galactic and extragalactic surveys.
Download dg foto art gold rushIn the compilation of Khazov et al.
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Download dg foto art gold rushTo aid the user in filtering the full alert stream for sources of interest, the ZTF alert stream provides rich alert packets containing not only the measurement that triggered the alert, but also a wide variety of contextual information.
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To minimize slew overheads, we upgraded both telescope drive axes as well as the dome drive system to enable faster slews.
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Download dg foto art gold rushFigure 5 shows the delivered image quality for all three ZTF filters.
It first prepares the processed science image and reference image by matching their photometric throughputs, warps the reference image onto the science image, and matches their backgrounds at low spatial frequencies.
Starting from the catalogs built from the deep reference images, we associate the sources in each epochal PSF photometry catalog with the nearest source in the reference catalog.
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Download dg foto art gold rushThe spectroscopic epochs are marked along the bottom axis.
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While the community brokers come online, we are also providing a bulk nightly release of public alerts.
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Download dg foto art gold rushRight: sequence of spectra of ZTF18aaayemw.
The rise is well captured in ZTF data.
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Download dg foto art gold rushThrough ZTF's high cadence and sensitivity, it is well suited to monitor the activity development of comets and to look for temporal variability, including both secular changes and rotational modulation of the activity, as well as transient events such as outbursts.
ZTF light curves of two Be star candidates selected from Yu et al.
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Though the field was observed in this commissioning phase multiple times over a period of days, comparisons to reference images did not reveal any optical counterpart.
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Tidal Disruption Events, Active Galactic Nuclei, and solar system objects.
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Private surveys are not allowed to use the observation history of the public surveys in the scheduling process.
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Download dg foto art gold rushThe image processing pipeline first subtracts bias frames and applies the flat field correction.
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We store all three filters in slots in a filter cabinet mounted in an access hatch of the telescope tube.
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Download dg foto art gold rushLeft: light curve of ZTF18aaayemw.
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This additive background must be removed from flats since it does not represent enhanced sensitivity.
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Download dg foto art gold rushThe realtime pipeline runs from raw images to transient alerts in about four minutes.
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Below we discuss the potential science return from the ZTF observations of solar system objects, and highlight four examples of early results from the first months of operation.
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RR Lyrae provided by the ZTF are also a useful tool to investigate their pulsational properties.
CCD gaps and improves the fill factor within the survey footprint from 87.
Download dg foto art gold rushFigure 8 gives one example of a Be star candidate that exhibits variability (upper panel) and another one that does not (lower panel).
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Extensive telemetry is aggregated from all ZTF hardware and telescope control subsystems.
Innovations Program (MSIP): a Northern Sky Survey and a Galactic Plane Survey.
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No viable optical counterparts were thus identified.
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Lossless Rice compression is then applied.
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Download dg foto art gold rushLEDs are driven by constant current sources, and their forward voltage is monitored to sense junction temperature so that temperature compensation can be applied if required.
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Download dg foto art gold rushFormal survey operations began on 2018 March 20, although routine operations of the filter exchanger and guide and focus CCDs occurred only in 2018 April and June respectively.
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Of these, 15 were only discovered by ZTF, while another 13 were first discovered by ZTF and later picked up by other surveys.
Additional optimization of the arm motion profile and exchanging closer to zenith is expected to reduce this further.
The pulsation periods P are taken from literature and not derived from the ZTF light curves.
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