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500 min on 500mm RC at F/d=8, ST10 XME. The blob indicated by the green cicrle is so far the furthest identified/measured source I have ever imaged. The redshift (z) is evaluated to 4.78, which translates to an emission when the universe was a bit less than 10% of his current age. The visual magnitude is beyond 25.
The Satanic Verses meets the Doppler Effect. Printed using stone lithography on both sides of the page.
The 100-inch Hooker telescope at the Mt. Wilson Observatory. It was here that Edwin Hubble made a number of landmark discoveries, such as evidence the universe is expanding.
Object: Gravitationally-lensed quasar (QSO 0957+561) and spiral galaxy
Constellation: Ursa Major
Distance: QSO: 8.85 Gly (NED); Gx: 57 Mly (NED, redshift)
Magnitude of QSO: 16.7
EdgeHD 8 on Atlas mount
Photometrics Quantix KAF-6303 (2k x 3k mono, -38C)
Luminance only 10x5m each
Processed in DSS, Nebulosity4, MaximDL, ImageJ
11/4/2016
Probably the most distant object I've imaged. This object was discovered in 1979 and spectroscopic evidence suggested that one of the quasars was actually a lensed image of the other. Subsequent studies confirmed this and also found a galaxy almost directly in line with one of the quasars. The galaxy (too faint to see here) is a member of a galactic cluster that is the source of the lensing action. One of the earliest direct observations of the gravitational lensing effect that Einstein predicted in 1936.
According to SIMBAD the angular distance between the images is about 6 arc-sec. I took a line profile through one of the unprocessed subs and obtained the same result - also confirmed that they differ by about 0.2m in brightness (I calculated about 0.3m).
The Satanic Verses meets the Doppler Effect. Printed using stone lithography on both sides of the page.
A little post-processing to the one I've posted in February 2013, mainly dynamic contrast adjustment and noise reduction.
I still quite like this one. Could be better in focus, but the snow was powder-like and blowing around, creating the halos around the street lights. Too much for the autofocus, I suspect.