VWDB Višnjan–Washington Sky Survey
Stand-in data
STAND-IN DATA. This catalog contains 2,279 ZTF detections and 1,000,000 synthetic fixture rows — NOT Visnjan-Washington observations. Stand-in data is loaded while the VW Data Analysis Pipeline is built. Do not use these measurements for science.

Sky coverage

Where the survey has detections. Click any cell to search it — the cell becomes a polygon search over its own RA/Dec bounds, which is the region the cell's count was taken over, so the two agree up to the 5,000-row limit every search has. The search arrives with every column filter row free, so you can narrow the cell by snr or mjd without giving anything up; it used to spend four of the five saying where the cell was.

Two things that link does not do. A polygon is not a cone, so a cell holding more than 5,000 detections reports “5,000 shown, and more matched” rather than the exact number on its tooltip — counting every match is affordable only under a cone's capped radius. And a cell that is both large and very dense can be refused rather than answered: a polygon's cost is estimated per row lying under it, so the 10° cell covering this catalog's densest patch comes out above the limit the portal answers without a cone. A smaller cell size is the answer — every cell at 1°, 2° and 5° is answered here. Hiding the fixture does not help, because the estimate counts the rows scanned rather than the rows kept, and neither does asking for fewer rows.

1,002,279 detections in 100 cells of 1.0°. Sky with at least one detection: at most 96 square degrees, or 0.2% of the sky. Mostly empty is the correct picture for now.

That is an upper bound, not a measured footprint. It is the area of the 1.0° grid squares that hold a detection, so a single detection claims a whole square and the sky actually observed can be orders of magnitude smaller — for the ZTF stand-in patch it is. The grid stays fixed at 1.0° whichever cell size you pick below, so the figure does not move when only the picture does. Measuring a real footprint needs the exposure outlines, which the stand-in data does not carry.

1.0° 2.0° 5.0° 10.0°
hide it — showing all data
RA 180–181, Dec 10–11: 10,190 detections (10,190 synthetic fixture) — click to search RA 180–181, Dec 11–12: 10,046 detections (10,046 synthetic fixture) — click to search RA 180–181, Dec 12–13: 9,804 detections (9,804 synthetic fixture) — click to search RA 180–181, Dec 13–14: 10,080 detections (10,080 synthetic fixture) — click to search RA 180–181, Dec 14–15: 10,022 detections (10,022 synthetic fixture) — click to search RA 180–181, Dec 15–16: 10,113 detections (10,113 synthetic fixture) — click to search RA 180–181, Dec 16–17: 10,112 detections (10,112 synthetic fixture) — click to search RA 180–181, Dec 17–18: 9,987 detections (9,987 synthetic fixture) — click to search RA 180–181, Dec 18–19: 9,843 detections (9,843 synthetic fixture) — click to search RA 180–181, Dec 19–20: 9,912 detections (9,912 synthetic fixture) — click to search RA 181–182, Dec 10–11: 9,938 detections (9,938 synthetic fixture) — click to search RA 181–182, Dec 11–12: 9,968 detections (9,968 synthetic fixture) — click to search RA 181–182, Dec 12–13: 9,978 detections (9,978 synthetic fixture) — click to search RA 181–182, Dec 13–14: 9,908 detections (9,908 synthetic fixture) — click to search RA 181–182, Dec 14–15: 9,941 detections (9,941 synthetic fixture) — click to search RA 181–182, Dec 15–16: 9,919 detections (9,919 synthetic fixture) — click to search RA 181–182, Dec 16–17: 10,040 detections (10,040 synthetic fixture) — click to search RA 181–182, Dec 17–18: 9,997 detections (9,997 synthetic fixture) — click to search RA 181–182, Dec 18–19: 10,090 detections (10,090 synthetic fixture) — click to search RA 181–182, Dec 19–20: 9,942 detections (9,942 synthetic fixture) — click to search RA 182–183, Dec 10–11: 10,081 detections (10,081 synthetic fixture) — click to search RA 182–183, Dec 11–12: 10,133 detections (10,133 synthetic fixture) — click to search RA 182–183, Dec 12–13: 9,921 detections (9,921 synthetic fixture) — click to search RA 182–183, Dec 13–14: 10,040 detections (10,040 synthetic fixture) — click to search RA 182–183, Dec 14–15: 10,127 detections (10,127 synthetic fixture) — click to search RA 182–183, Dec 15–16: 9,883 detections (9,883 synthetic fixture) — click to search RA 182–183, Dec 16–17: 9,986 detections (9,986 synthetic fixture) — click to search RA 182–183, Dec 17–18: 9,968 detections (9,968 synthetic fixture) — click to search RA 182–183, Dec 18–19: 10,216 detections (10,216 synthetic fixture) — click to search RA 182–183, Dec 19–20: 10,021 detections (10,021 synthetic fixture) — click to search RA 183–184, Dec 10–11: 9,941 detections (9,941 synthetic fixture) — click to search RA 183–184, Dec 11–12: 9,934 detections (9,934 synthetic fixture) — click to search RA 183–184, Dec 12–13: 9,858 detections (9,858 synthetic fixture) — click to search RA 183–184, Dec 13–14: 9,989 detections (9,989 synthetic fixture) — click to search RA 183–184, Dec 14–15: 10,069 detections (10,069 synthetic fixture) — click to search RA 183–184, Dec 15–16: 10,156 detections (10,156 synthetic fixture) — click to search RA 183–184, Dec 16–17: 9,939 detections (9,939 synthetic fixture) — click to search RA 183–184, Dec 17–18: 10,031 detections (10,031 synthetic fixture) — click to search RA 183–184, Dec 18–19: 10,128 detections (10,128 synthetic fixture) — click to search RA 183–184, Dec 19–20: 10,000 detections (10,000 synthetic fixture) — click to search RA 184–185, Dec 10–11: 10,147 detections (10,147 synthetic fixture) — click to search RA 184–185, Dec 11–12: 10,025 detections (10,025 synthetic fixture) — click to search RA 184–185, Dec 12–13: 9,881 detections (9,881 synthetic fixture) — click to search RA 184–185, Dec 13–14: 9,920 detections (9,920 synthetic fixture) — click to search RA 184–185, Dec 14–15: 10,556 detections (10,134 synthetic fixture) — click to search RA 184–185, Dec 15–16: 10,032 detections (9,961 synthetic fixture) — click to search RA 184–185, Dec 16–17: 10,045 detections (10,045 synthetic fixture) — click to search RA 184–185, Dec 17–18: 9,948 detections (9,948 synthetic fixture) — click to search RA 184–185, Dec 18–19: 9,987 detections (9,987 synthetic fixture) — click to search RA 184–185, Dec 19–20: 10,054 detections (10,054 synthetic fixture) — click to search RA 185–186, Dec 10–11: 9,934 detections (9,934 synthetic fixture) — click to search RA 185–186, Dec 11–12: 9,795 detections (9,795 synthetic fixture) — click to search RA 185–186, Dec 12–13: 9,837 detections (9,837 synthetic fixture) — click to search RA 185–186, Dec 13–14: 9,972 detections (9,972 synthetic fixture) — click to search RA 185–186, Dec 14–15: 10,440 detections (9,915 synthetic fixture) — click to search RA 185–186, Dec 15–16: 11,305 detections (10,044 synthetic fixture) — click to search RA 185–186, Dec 16–17: 9,799 detections (9,799 synthetic fixture) — click to search RA 185–186, Dec 17–18: 10,028 detections (10,028 synthetic fixture) — click to search RA 185–186, Dec 18–19: 10,099 detections (10,099 synthetic fixture) — click to search RA 185–186, Dec 19–20: 10,033 detections (10,033 synthetic fixture) — click to search RA 186–187, Dec 10–11: 10,097 detections (10,097 synthetic fixture) — click to search RA 186–187, Dec 11–12: 9,769 detections (9,769 synthetic fixture) — click to search RA 186–187, Dec 12–13: 10,124 detections (10,124 synthetic fixture) — click to search RA 186–187, Dec 13–14: 9,963 detections (9,963 synthetic fixture) — click to search RA 186–187, Dec 14–15: 10,008 detections (10,008 synthetic fixture) — click to search RA 186–187, Dec 15–16: 9,792 detections (9,792 synthetic fixture) — click to search RA 186–187, Dec 16–17: 9,917 detections (9,917 synthetic fixture) — click to search RA 186–187, Dec 17–18: 10,129 detections (10,129 synthetic fixture) — click to search RA 186–187, Dec 18–19: 10,037 detections (10,037 synthetic fixture) — click to search RA 186–187, Dec 19–20: 10,087 detections (10,087 synthetic fixture) — click to search RA 187–188, Dec 10–11: 9,878 detections (9,878 synthetic fixture) — click to search RA 187–188, Dec 11–12: 9,988 detections (9,988 synthetic fixture) — click to search RA 187–188, Dec 12–13: 10,090 detections (10,090 synthetic fixture) — click to search RA 187–188, Dec 13–14: 9,795 detections (9,795 synthetic fixture) — click to search RA 187–188, Dec 14–15: 10,227 detections (10,227 synthetic fixture) — click to search RA 187–188, Dec 15–16: 10,203 detections (10,203 synthetic fixture) — click to search RA 187–188, Dec 16–17: 10,143 detections (10,143 synthetic fixture) — click to search RA 187–188, Dec 17–18: 9,778 detections (9,778 synthetic fixture) — click to search RA 187–188, Dec 18–19: 10,075 detections (10,075 synthetic fixture) — click to search RA 187–188, Dec 19–20: 10,057 detections (10,057 synthetic fixture) — click to search RA 188–189, Dec 10–11: 9,949 detections (9,949 synthetic fixture) — click to search RA 188–189, Dec 11–12: 9,944 detections (9,944 synthetic fixture) — click to search RA 188–189, Dec 12–13: 9,996 detections (9,996 synthetic fixture) — click to search RA 188–189, Dec 13–14: 9,990 detections (9,990 synthetic fixture) — click to search RA 188–189, Dec 14–15: 9,966 detections (9,966 synthetic fixture) — click to search RA 188–189, Dec 15–16: 10,091 detections (10,091 synthetic fixture) — click to search RA 188–189, Dec 16–17: 10,075 detections (10,075 synthetic fixture) — click to search RA 188–189, Dec 17–18: 9,889 detections (9,889 synthetic fixture) — click to search RA 188–189, Dec 18–19: 10,012 detections (10,012 synthetic fixture) — click to search RA 188–189, Dec 19–20: 10,093 detections (10,093 synthetic fixture) — click to search RA 189–190, Dec 10–11: 9,916 detections (9,916 synthetic fixture) — click to search RA 189–190, Dec 11–12: 10,089 detections (10,089 synthetic fixture) — click to search RA 189–190, Dec 12–13: 10,183 detections (10,183 synthetic fixture) — click to search RA 189–190, Dec 13–14: 10,112 detections (10,112 synthetic fixture) — click to search RA 189–190, Dec 14–15: 9,948 detections (9,948 synthetic fixture) — click to search RA 189–190, Dec 15–16: 10,027 detections (10,027 synthetic fixture) — click to search RA 189–190, Dec 16–17: 9,933 detections (9,933 synthetic fixture) — click to search RA 189–190, Dec 17–18: 9,790 detections (9,790 synthetic fixture) — click to search RA 189–190, Dec 18–19: 10,044 detections (10,044 synthetic fixture) — click to search RA 189–190, Dec 19–20: 9,987 detections (9,987 synthetic fixture) — click to search 60° 120° 180° 240° 300° -60° -30° 0° +30° +60° RA (degrees) — increasing to the left
detections per cell 0 9 105 1,095 11,305 (log scale)

The large even block spanning RA 180–190°, Dec 10–20° is the synthetic test fixture — a million uniformly random points, not observations of anything. Real ZTF stand-in detections are the small bright cell near RA 185°, Dec 15°. Hide the fixture to see only real ingests.

Cells are RA/Dec rectangles, so they are not equal-area — a cell near a pole covers much less sky than one at the equator. Fine for finding coverage, not for comparing densities across declination. Same data as JSON: /api/sky?bin=1.0