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| META TOPICPARENT |
name="WebHome" |
Field Grid Aligned to the Galactic Plane |
| | which focus on the plane. Conversely, this also helps programs which want to focus
on extra-galactic fields. |
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< | Below are two figures. The first shows a sample of fields in the primary ZTF grid (IDs < 1000) |
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> | Below are two figures. The first shows a sample of fields in the primary ZTF grid (IDs < 1000) |
| | near the Galactic Plane with the original grid pattern and a possible new pattern. |
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< | The second shows another field sample using the secondary ZTF grid (IDs > 1000). |
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> | The second shows another field sample using the secondary ZTF grid (IDs > 1000). |
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The orange dashed line is the |b|=0 and the orange dotted lines are |b|=5 degrees. |
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- ZTF_CCD_Layout.tbl: ZTF CCD Layout (ASCII) (as of September 2016). This table gives the corners of all 16 ZTF CCDs in degrees relative to the center of the field. The ZTF field is about 7.46 degrees high in the north-south direction and 7.29 degrees wide in the east-west direction. So the average spacing between fields in the primary grid is 7.2 degrees N-S and 7.0 degrees E-W. The CCDs are about 1.707 degrees on a side, and the gap between CCDs is about 0.186 degrees in the N-S direction and about 0.130 degrees in the E-W direction.
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- ZTF Primary Grid on Sky : This shows the layout of the field centers of the primary grid on the sky. The fields are arranged in sets of constant declination. The galactic plane is shown by an orange dashed line, and |b|=5,15,20 degrees are shown by dotted lines. Note that the grid aligns with the galactic plane for Dec<+58, with two fields on either side of the plane to cover |b| < 5 degrees.
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- ZTF Primary Grid on Sky : This shows the layout of the field centers of the primary grid on the sky. The fields are arranged in sets of constant declination. The galactic plane is shown by an orange dashed line, and |b|=5,15,20 degrees are shown by dotted lines. Note that the grid aligns with the galactic plane for Dec<+58, with two fields on either side of the plane to cover |b| < 5 degrees.
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- ZTF Primary and Secondary Grids on Sky: This shows the primary and secondary field centers (red crosses). The secondary grid is also set up in sets of constant declination between the primary grid declination sets. The secondary grid also aligns with the galactic plane with field centers at |b|=0.
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- ZTF North Celestial Pole 2: This shows 2 additional fields which cover the north pole cap. One is centered at RA=10 DEC=+88 and the other at RA=170 DEC=+88. This allows us to observe the north pole region at different times of the year. The offset in RA is helpful in filling in the CCD gaps.
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- ZTF North Celestial Pole 2: This shows 2 additional fields which cover the north pole cap. One is centered at RA=10 DEC=+87.4 and the other at RA=170 DEC=+87.4. This allows us to observe the north pole region at different times of the year. The offset in RA is helpful in filling in the CCD gaps. The northern most fields were modified in April 2019 to adjust for the 87.5 degree DEC limit.
- ZTF North Celestial Pole 3: This shows all 4 fields which cover the north pole cap from both the primary and secondary grids. These were modified in April 2019 to adjust for the 87.5 degree DEC limit.
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Nearby Galaxies |
| | overlap of the primary grid, 13% of the time a position will fall on a CCD on more than field of the primary
grid.
| Number of CCDs |
Primary |
Pri+Sec |
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| >= 1 (of 16) |
0.875 |
0.9922 |
| >= 2 (of 16) |
0.133 |
0.823 |
| >= 1 (of inner 4) |
0.254 |
0.505 |
| >= 1 (of inner 12) |
0.699 |
0.964 |
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>
> |
| >= 1 (of 16) |
0.875 |
0.9922 |
| >= 2 (of 16) |
0.133 |
0.823 |
| >= 1 (of inner 4) |
0.254 |
0.505 |
| >= 1 (of inner 12) |
0.699 |
0.964 |
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Uncovered Sky |
| | CCD gaps (Primary+Secondary Gaps), these gaps
or unavoidable unless the fields were placed very close together. |
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| | -- TomBarlow - 2 June 2017 |
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| META FILEATTACHMENT |
attachment="ztfmos2.gif" attr="" comment="ZTF fields near galactic plane, secondary grid" date="1494633098" name="ztfmos2.gif" path="ztfmos2.gif" size="19466" stream="ztfmos2.gif" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="ztfmos1.gif" attr="" comment="ZTF fields near galactic plane, primary grid" date="1494633125" name="ztfmos1.gif" path="ztfmos1.gif" size="23154" stream="ztfmos1.gif" user="Main.TomBarlow" version="1" |
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| META FILEATTACHMENT |
attachment="ZTF_Fields.txt" attr="" comment="" date="1504039538" name="ZTF_Fields.txt" path="ZTF_Fields.txt" size="159750" stream="ZTF_Fields.txt" user="Main.TomBarlow" version="4" |
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| META FILEATTACHMENT |
attachment="ZTF_Fields.txt" attr="" comment="New ZTF field file with modified polar fields" date="1556660988" name="ZTF_Fields.txt" path="ZTF_Fields.txt" size="159750" user="TomBarlow" version="5" |
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| META FILEATTACHMENT |
attachment="ZTF_CCD_Layout.tbl" attr="" comment="" date="1496359625" name="ZTF_CCD_Layout.tbl" path="ZTF_CCD_Layout.tbl" size="1692" stream="ZTF_CCD_Layout.tbl" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="ztf_primary_sky.gif" attr="" comment="" date="1496439667" name="ztf_primary_sky.gif" path="ztf_primary_sky.gif" size="24579" stream="ztf_primary_sky.gif" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="ztf_primary_secondary_sky.gif" attr="" comment="" date="1496439684" name="ztf_primary_secondary_sky.gif" path="ztf_primary_secondary_sky.gif" size="29628" stream="ztf_primary_secondary_sky.gif" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="ztf_primary_secondary_overlap.gif" attr="" comment="" date="1496440423" name="ztf_primary_secondary_overlap.gif" path="ztf_primary_secondary_overlap.gif" size="18652" stream="ztf_primary_secondary_overlap.gif" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="ztf_primary_overlap.gif" attr="" comment="" date="1496440436" name="ztf_primary_overlap.gif" path="ztf_primary_overlap.gif" size="19614" stream="ztf_primary_overlap.gif" user="Main.TomBarlow" version="1" |
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| META FILEATTACHMENT |
attachment="ztf_northpole2.gif" attr="" comment="" date="1496442629" name="ztf_northpole2.gif" path="ztf_northpole2.gif" size="17176" stream="ztf_northpole2.gif" user="Main.TomBarlow" version="1" |
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| META FILEATTACHMENT |
attachment="ztf_northpole2.gif" attr="" comment="new image with modified polar fields" date="1556661289" name="ztf_northpole2.gif" path="ztf_northpole2.gif" size="15078" user="TomBarlow" version="2" |
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| META FILEATTACHMENT |
attachment="ztf_northpole1.gif" attr="" comment="" date="1496442639" name="ztf_northpole1.gif" path="ztf_northpole1.gif" size="21335" stream="ztf_northpole1.gif" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="M31_primary.gif" attr="" comment="" date="1496696103" name="M31_primary.gif" path="M31_primary.gif" size="9148" stream="M31_primary.gif" user="Main.TomBarlow" version="2" |
| META FILEATTACHMENT |
attachment="M87_Virgo_primary.gif" attr="" comment="" date="1496446175" name="M87_Virgo_primary.gif" path="M87_Virgo_primary.gif" size="11150" stream="M87_Virgo_primary.gif" user="Main.TomBarlow" version="1" |
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| META FILEATTACHMENT |
attachment="M85_M100_primary.gif" attr="" comment="" date="1496446216" name="M85_M100_primary.gif" path="M85_M100_primary.gif" size="10352" stream="M85_M100_primary.gif" user="Main.TomBarlow" version="1" |
| META FILEATTACHMENT |
attachment="M101_primary.gif" attr="" comment="" date="1496696076" name="M101_primary.gif" path="M101_primary.gif" size="8310" stream="M101_primary.gif" user="Main.TomBarlow" version="2" |
| META FILEATTACHMENT |
attachment="ztf_prim_seco_gaps.gif" attr="" comment="" date="1497053490" name="ztf_prim_seco_gaps.gif" path="ztf_prim_seco_gaps.gif" size="18694" stream="ztf_prim_seco_gaps.gif" user="Main.TomBarlow" version="1" |
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| META FILEATTACHMENT |
attachment="ztf_northpole3.gif" attr="" comment="" date="1556661361" name="ztf_northpole3.gif" path="ztf_northpole3.gif" size="8697" user="TomBarlow" version="1" |
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