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Download dg foto art gold rushIt is mounted on a tower close to the P48 dome.
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.
Formal 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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Download dg foto art gold rushFigure 6 shows the limiting magnitudes obtained in all three filters over one lunation.
Figure 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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Download dg foto art gold rushIn the compilation of Khazov et al.
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Download dg foto art gold rushImages in r and g bands were again taken the following night.
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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.
Each 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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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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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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Specifications of the ZTF Observing System.
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Download dg foto art gold rushBe star candidates show qualitative variability.
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RR Lyrae provided by the ZTF are also a useful tool to investigate their pulsational properties.
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Download dg foto art gold rushPrivate surveys are not allowed to use the observation history of the public surveys in the scheduling process.
Download dg foto art gold rushExtensive telemetry is aggregated from all ZTF hardware and telescope control subsystems.
Download dg foto art gold rushThough 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.
The fields are aligned to cover the Galactic Plane region with the fewest pointings, improving the efficiency of both Galactic and extragalactic surveys.
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Using 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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Right: sequence of spectra of ZTF18aaayemw.
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To 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.
While the community brokers come online, we are also providing a bulk nightly release of public alerts.
The pulsation periods P are taken from literature and not derived from the ZTF light curves.
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Download dg foto art gold rushInnovations Program (MSIP): a Northern Sky Survey and a Galactic Plane Survey.
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Bogus system, and poor winter weather.
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.
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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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.
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The realtime pipeline runs from raw images to transient alerts in about four minutes.
Given the differences of the ZTF system relative to potential calibrators (SDSS, PS1, Gaia), we did not attempt to match any existing filter bandpasses exactly.
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.
Of these, 15 were only discovered by ZTF, while another 13 were first discovered by ZTF and later picked up by other surveys.
The image processing pipeline first subtracts bias frames and applies the flat field correction.
The arm then disconnects from the filter frame and stows against the wall of the telescope tube.
East 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 rushCCD gaps and improves the fill factor within the survey footprint from 87.
We expect to run these public surveys for at least the first eighteen months of the ZTF survey.
The spectroscopic epochs are marked along the bottom axis.
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Download dg foto art gold rushLeft: light curve of ZTF18aaayemw.
Earth Asteroids Discovered by ZTF as of 2018 April 30.
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 rushFigure 5 shows the delivered image quality for all three ZTF filters.
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LED illuminators, and a baffled enclosure.
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Download dg foto art gold rushWe store all three filters in slots in a filter cabinet mounted in an access hatch of the telescope tube.
LEDs 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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ZTF light curves of two Be star candidates selected from Yu et al.
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However, most relatively bright asteroids show a clear light curve covering an incomplete rotation (Figure 10(b)).
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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.
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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.
Typical stacks have at least 15 images.
This additive background must be removed from flats since it does not represent enhanced sensitivity.
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Reference building pipelines are triggered automatically at the end of the night.
It 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.
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No viable optical counterparts were thus identified.
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The rise is well captured in ZTF data.
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