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The Fifth Planet Ceres
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The Fifth Planet Ceres
On Nov 11, 11:11 am, kT wrote:
I picked this up at Habitablezone (I know, it's a bad habit). http://arxiv.org/abs/0711.1152 Enjoy! http://arxiv.org/PS_cache/arxiv/pdf/...711.1152v1.pdf "Ceres was imaged using NIRC2, the second-generation near-infrared camera (1024x1024 InSb Aladdin-3) and the adaptive optics(AO) system installed at the Nasmyth focus of the Keck II telescope [van Dam et al., 2004]. The images of Ceres were acquired at 3 near-infrared wavebands J [1.166- 1.330 µm], H [1.485-1.781 µm], and K [1.948-2.299 µm], with an image scale of 9.942 ± 0.050 milliarcsec per pixel." " Maps description: The J-, H- and K-band maps shown in Fig. 4, and covering ~80% of Ceres' surface (see Table 6), are the result of combining 126, 99 and 135 individual projections respectively. We also derived error albedo maps (Fig. 5) by measuring, for each pixel, the intensity dispersion across the individual views. The theoretical size of the resolution element for J-, H- and K-band is 36.8 km, 47.4 km and 62.9 km respectively (corresponding to 4.4., 5.6. and 7.5. at the equator). The major features sustain diameters of ~180 km (A and B) but smaller features can be seen in all three maps down to ~50 km scale." Ceres at roughly 944 km diameter and if given a distance from KECK/ Hubble of 289,224,000 km is 755 fold further away than our moon, and with a Ceres resolution via KECK as tight as 30 km is what represents that our moon via the exact same KECK performance and without my aperture soft modifications is worthy of 40 meters/pixel, and otherwise along with my soft aperture reductions of 99% per each primary mirror would is in fact what should yield that better than one meter resolution/pixel of our moon, especially as being green or blue laser cannon illuminated. http://en.wikipedia.org/wiki/Ceres_(dwarf_planet) Ceres, taken in 2003/4 with at 1.94 AU or 290,224,000 km offered a resolution of about 30 km. Ceres at the minimum distance of under 1.6 AU from Earth would get that resolution/pixel a little better yet (perhaps better than 25 km). Of course, if that extremely old CCD outdated Hubble managed Ceres at 30 km/pixel, whereas by now team KECK should have been capable of accomplishing at least twice that good, or roughly 15 km/pixel without even involving those soft aperture modifications. -- Brad Guth |
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