List of archive data of rectangular X,Y positions

Many rectangular X,Y positions have been keypunched from the literature or measured on photographs.

These positions are useful to plot charts or determine cross-identifications. They have been used extensively in the database, but so far not made publicly available.
This archive allows to plot the charts and retrieve the original files.

The X,Y positions have been computed with respect to a central star (x = X - Xc) to make it easier to use. The number of the star selected as central object is given in the column Center and the original coordinates are given in the columns Xc and Yc.

If the column Center is empty, it means that the X,Y positions have been measured on the plate found in the reference quoted.
Measurements have always been refered to a central object.

The magnitudes indicated in the file are normally the Johnson V magnitude. But it may also be mpg or G from RGU, depending on the original data.
The column Mag precises which kind of magnitudes is used in each file.

The link under the file name (for example mathews.xy) plots the map. The maps are active, one can click on the star to get their identifications.
The link under the X,Y displays the data or retrieves the data by http.

NGC clusters

ClusterFileDataCenterXcYcMagAuthorsReference
NGC 1039 mathews.xy XY 365.593.9PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 1528 mathews.xy XY 680.295.9PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 1605 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
NGC 1664 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
NGC 1912 mathews.xy XY 184.280.9PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 2215 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 2323 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 2324 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 2360 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 2439 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 2447 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 2910 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 3330 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 4103 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 6451 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)
NGC 6520 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
NGC 6633 mathews.xy XY 269.778.6PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 6709 mathews.xy XY 269.778.6PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 6755 mathews.xy XY 1970.587.0PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14

becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
NGC 6756 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
NGC 6823 mathews.xy XY 175.187.7PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 6871 mathews.xy XY 577.993.8PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 6882 mathews.xy XY 1979.091.1PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 6883 mathews.xy XY 278.979.8PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 6910 mathews.xy XY 2376.388.6PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 7243 mathews.xy XY 478.294.1PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 7380 mathews.xy XY 470.596.0PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 7510 mathews.xy XY 776.189.9PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14
NGC 7788 mathews.xy XY 2571.880.8PV Mathews R.T. 1963, Publ. Goodsell Obs. no 14

IC clusters

ClusterFileDataCenterXcYcMagAuthorsReference
IC 2714 becker.xy XY


V Becker W., et al. 1976, Katalogue ... (Basel)

Anon clusters

ClusterFileDataCenterXcYcMagAuthorsReference
Basel 4 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
Basel 5 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
King 8 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)
Trumpler 31 becker.xy XY


V(RGU) Becker W., et al. 1976, Katalogue ... (Basel)


Jean-Claude.Mermilliod@obs.unige.ch
Last update: 2005 August 11