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No, no, I think it should be "semperumbra", or something similar.<br>
<br>
Jean-Joseph<br>
<br>
<div class="moz-cite-prefix">On 12/25/2013 12:50 AM, Hutch wrote:<br>
</div>
<blockquote
cite="mid:CANY-fRZPgW2wzzaOk0wmapzZau0-B0T8RDoJegaHzQ8xdbEB9w@mail.gmail.com"
type="cite">
<div dir="ltr">In this blog report of a seminar on the (apparently
increasing) likelihood of water ice in deep, permanently
shadowed craters on Mercury's poles, the author repeatedly uses
the phrases "permanent shadow" and "permanently shadowed".<br>
<div><br>
<a moz-do-not-send="true"
href="http://www.planetary.org/blogs/guest-blogs/2013/lpsc2013-mercury-shadowed-craters.html">http://www.planetary.org/blogs/guest-blogs/2013/lpsc2013-mercury-shadowed-craters.html</a><br>
<br>
</div>
<div>These three articles about similar phenomena on Luna use
the same phrases.<br>
</div>
<div><br>
<a moz-do-not-send="true"
href="http://www.esa.int/Our_Activities/Space_Science/SMART-1/Shackleton_crater_SMART-1_s_search_for_light_shadow_and_ice_at_lunar_South_Pole">http://www.esa.int/Our_Activities/Space_Science/SMART-1/Shackleton_crater_SMART-1_s_search_for_light_shadow_and_ice_at_lunar_South_Pole</a><br>
<br>
<a moz-do-not-send="true"
href="http://onlinelibrary.wiley.com/doi/10.1029/2002GL016180/full">http://onlinelibrary.wiley.com/doi/10.1029/2002GL016180/full</a><br>
<br>
<a moz-do-not-send="true"
href="http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2590.pdf">http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2590.pdf</a><br>
<br>
</div>
<div>If there's an astronomy word for this, it seems likely that
it's as obscure as OUR words. So I propose we invent the word.<br>
<br>
"Umbra" is the astronomy word for shadow. Specifically, it
means the center portion of the eclipse shadow. The word is
Latin for "shade" or "shadow"<br>
<br>
"Perpetual" or "Permanent" both come from Latin, thus would be
good matches for "Umbra". So ...<br>
<br>
</div>
<div> "perpetumbra" <br>
</div>
<div> "permanumbra"<br>
<br>
</div>
<div>... seem the best choices. I'm inclined toward the latter:
as being similar to "permafrost" and "penumbra". Now we just
need to find an excuse to get it into publication and then
call the publication to the attention of the scientists in the
articles cited above. *G*<br>
<br>
</div>
<div> "Mercury's Permanumbra<br>
</div>
<div> "Search for Permanumbral Ice at Lunar South Pole"<br>
"Permanumbra in Simple Craters Near the Lunar Poles"<br>
"Characterization of Lunar Polar and Non-Polar
Permanumbra Physical and Thermal Characteristics"<br>
</div>
<div>
<div class="gmail_extra"><br>
BB,
<div>Hutch</div>
<div> </div>
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<br>
<div class="gmail_quote">On Tue, Dec 24, 2013 at 8:36 PM,
eLLioTT morEton <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:em@swarpa.net"
target="_blank">em@swarpa.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div class="im">On Mon, 23 Dec 2013, Jim Moskowitz
wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
Elliott: "Someone must have a name for this
(ecologists? orienteers? real-estate agents?).<br>
</blockquote>
<br>
</div>
*Does* anyone know what it's called? Is there an
astronomy word for a body that is permanently in the
shadow of another?<br>
<br>
Regards,<br>
em<br>
</blockquote>
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