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Names M 97, NGC 3587, PN G148.4+57.0 Owl Nebula
Right Ascension (2000.0) 11:14:47.7
Declination +55:01:09
Constellation Ursa Major
Redshift (z) ...
Heliocentric Radial Velocity ...
Distance (esteem) 2,600 light years
Date (DD/MM/YYYY) 10/02/2011
Exposure time 15,000 seconds (10 x 1500 exposures) with binning mode 1 x 1 and AO-7
CCD Camera SBIG ST-8XE
Telescope Meade Instruments Schmidt-Cassegrain 14" LX200 GPS
Focal length 3556 mm
Diameter 355.6 mm
Focal ratio 10
Field of View 13.3 x 8.9 arcminute
Original scale 0.522 arcsecond / pixel

Palomar Observatory Sky Survey images
POSS I/E DSS1 Red
POSS I/O DSS2 Blue
POSS II/F DSS2 Red
POSS II/J DSS2 Blue
POSS II Color
Sloan Digital Sky Survey images
SDSS image
Nordic Optical Telescope 2.5-meter telescope image
NOT

Comments
The distance of the Owl nebula is uncertain. The bright galaxy just south of it is PGC 34279. Its Redshift is 0.033948 +/- 0.000076, the Heliocentric Radial Velocity 10177 +/- 23 km/s and the Distance 452,000,000 light years.
The spiral galaxy in the north-eastern corner of the image is PGC 2489233. Its Redshift is 0.070739 +/- 0.000179, the Heliocentric Radial Velocity 21207 +/- 54 km/s and the Distance 909,000,000 light years. I used the Van Cittert's method of deconvolution (where the first parameter is the FWHM and the second is the number of iterations) or the Unsharp Masking (radius) to enhance the spiral structure.
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