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The outher rings of M57 are visible only with Ha-filter. A remarkable feature is our short exposure time through the filter
[filesize 186 KB]
| 26.07.2003 m57, CCD-Camera2, 60min exposed, Ha-Filter 13nm bandpass, Harpoint observatory, 50cm RC, f=4m The outher rings of M57 are visible only with Ha-filter. A remarkable feature is our short exposure time through the filter [filesize 186 KB] |
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