[meteorite-list] meteoroid temperature Results (P. I)

From: MexicoDoug_at_aol.com <MexicoDoug_at_meteoritecentral.com>
Date: Fri Jan 7 05:30:27 2005
Message-ID: <1a6.2ed059b6.2f0fbeb5_at_aol.com>

En un mensaje con fecha 01/06/2005 11:27:43 AM Mexico Standard Time,
lbp_at_privat.tdcadsl.dk escribe:

>What is the temperature of a meteoroid drifting thrue space ?
>Is it too small to absorb radiation-energi from the sun ?

Hi Lars, I'm breaking this email in three chapters, first the results, and
the second and third parts will be assumptions and most discussion.

Part I

There is no minimum size to absorb energy from the Sun, even a molecule can
do it - heat of everything is actually principally caused by molecular
vibrational motion in the Infrared range under normal circumstances - molecular
vibrations. So that answers the easy question.

On the temperature of a meteoroid traveling in space, that is a complicated
question because the question is really millions of questions in one
depending on what temperature you mean - and where you measure it.

But I think I can give a shot at a satisfying at everything you wanted to
know on the first question and weren't afraid to ask, with the following
calculations you kept me awake doing. You can make a lot of interesting
observations here. I'd add a Eucrite and an Enstatite Achondrite, which I expect the
former would not be closer to OC, and the later more on the way to the irons.
I guess:)

Distance Energy flux <-------T (degrees C)--------> T(Planet av. Surf.)
AU W/m2 CC OC Fe-Ni "ideal" note
0.31 14,214 216 195 378 227 Mercury (p) 167
0.47 6,184 124 107 255 133 Mercury (ap) 167
0.72 2,635 48 34 154 55 Venus 464
1.00 1,366 -1 -12 89 6 Earth 15
1.52 591 -52 -62 21 -47 Mars -63
2.80 174 -110 -117 -57 -107
3.00 152 -116 -123 -64 -112
4.00 85 -137 -143 -92 -134
5.00 55 -151 -156 -111 -148
5.2 51 -154 -159 -114 -151 Jupiter -144
9.5 15 -185 -188 -155 -183 Saturn -176
19.2 3.7 -211 -214 -190 -209 Uranus -215
29.7 1.5 -223 -225 -207 -222 Pluto (p) -223
30.1 1.5 -223 -226 -207 -222 Neptune -215
49.3 0.6 -234 -236 -221 -233 Pluto (ap) -223 Kuiper, Comets (ap)
50K 0.000001 -272 -272 -271 -272 Oort Cloud

(Table may not display well in text, but if you copy it into excel and use
text-to-columns it should look great.)
Proximamente: Assumptions
Received on Fri 07 Jan 2005 05:30:13 AM PST