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  1. #1
    kT's Avatar
    kT Guest

    Default The Fifth Planet Ceres

    I picked this up at Habitablezone (I know, it's a bad habit).


  2. #2
    BradGuth's Avatar
    BradGuth Guest

    Default The Fifth Planet Ceres

    On Nov 11, 11:11 am, kT <> wrote:

    "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 Ám], H [1.485-1.781 Ám], and K [1.948-2.299 Ám], 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

    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.
    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    Of course, if that extremely old CCD outdated Hubble managed Ceres at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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