HDTenEightyP/NetNews huggingface dataset:
Newsgroups: sci.astro

dsmith@hplabsz.hpl.hp.com (David R. Smith) writes:

> We have heard some horror stories about buying astronomical stuff from New
> York camera stores, among others.  Does anyone have an opinion on Shutan
> Camera and Video in Chicago?  They sent me a catalog, presumably from
> borrowing Sky & Tel's mailing list.  Their 20% off sale on TeleVue eyepieces
> looks tempting.

I was tempted as well.  The ad copy states "Limited Time Offer", so I 
called the same day that the catalog arrived.  I was told that they
would not offer the Televue Panoptic at that price, because "All the
eyepieces at that price had been sold already".  It is of course very
reasonable for them to offer a limited stock at a sale price, but this
isn't what the printed copy stated, and I was left with a lingering
scent of weasel in the air.  What they did have left at the 20% discount
were a few Plossls and Wide Fields.
From: stndrd@druwa.ATT.COM (DeibertT)
Newsgroups: sci.astro
Subject: Cleaning Meteorites ???
Keywords: question
Date: 26 Dec 92 21:47:40 GMT
Distribution: sci


I recently obtained a meteorite and have a question
about how to clean it.

It is a "nickel-iron" type that has been sliced to show
the stratification marks, and has developed some
rust type material that detracts from it's beauty.
It's dimesions of the sliced area is app. 2" X 2".

It is allegedly from the crater at Canyon Diablo near
Winslow, AZ.

Thanks in advance, and clear skys.

			Tim Deibert att!druwa!timle

--

		     Tim Deibert
		     stndrd@druwa.att.com

Newsgroups: sci.astro
From: chris@chrism.demon.co.uk (Chris Marriott)
Subject: Visual Magnitude of the Moon
Distribution: world
Organization: None
Reply-To: chris@chrism.demon.co.uk
X-Mailer: Simple NEWS 1.90 (ka9q DIS 1.19)
Date: Sat, 2 Jan 1993 14:29:14 +0000

I wonder if anyone can assist me with a mathematical astronomy problem.
I've looked through all the books I have access to, and can find no
mention of this problem.

Basically, I'm looking for an equation giving the approximate visual
magnitude of the moon as a function of its phase and distance.

Sounds like a simple problem, but I suspect it's not.  Any advice would be
appreciated.

Chris
-- 
--------------------------------------------------------------------------
| Chris Marriott                           | chris@chrism.demon.co.uk    |
| Warrington, UK                           | BIX: cmarriott              |
| (Still awaiting inspiration              | CIX: cmarriott              |
|  for a witty .sig .... )                 | CompuServe: 100113,1140     |
--------------------------------------------------------------------------
 
Newsgroups: sci.astro,rec.radio.shortwave
From: monta@image.mit.edu (Peter Monta)
Subject: "Space Potato" in Journal of Irreproducible Results
Organization: MIT Advanced Television Research Program
Date: Thu, 31 Dec 1992 08:39:56 GMT

There's a note in the December Journal of Irreproducible Results that
might amuse those who remember the ravings of that Finnish guy
awhile back.  The margin even has a line sketch of a young girl
gazing at a spherical object in her hand (no joke!).

(copied without permission, sorry)

Subatomic Child's Play

For decades, physicists have struggled to develop an intuitive
understanding of the subatomic world.  Photons, quarks, and their ilk
behave in ways that sometimes leave scientists shaking their heads in
bemusement.  Psychologists at the University of Michigan theorize that
the real problem lies in the educational system---that children are
currently being educated to have outmoded intuition.  These
psychologists are conducting an experiment to see whether children can
develop a different, better intuitive understanding of nature if left
to their own devices.  In the experiment, children aged five and
younger will be given particle accelerators and allowed to play with
them in their own way.  It is hoped that the chilldren will develop a
clear understanding of the quantum world and will then pass that
understanding on to adult physicists and science teachers.

Peter Monta   monta@image.mit.edu
MIT Advanced Television Reserach Program
Xref: sparky sci.astro:13522 sci.space:18407 sci.physics:21880 sci.environment:14042
From: lordSnooty@cup.portal.com (Andrew - Palfreyman)
Newsgroups: sci.astro,sci.space,sci.physics,sci.environment
Subject: Re: averting doom
Date: Wed, 30 Dec 92 05:54:55 PST
Organization: The Portal System (TM)
Distribution: world

I like the simplicity of this idea (moving the Earth instead of
trying to shield it), but what the heck's all this "elastic
collisions" stuff? Surely you're not serious about the "broken
Kepler" business? 

Instead, I'd use the "tame asteroid" in a resonant slingshot
configuration between (say) Mars and Earth, in order to bring
Mars "down" and Earth "up" the Sun's gravitational potential
well. Hell, use a string of 'em to speed things up.....
 --------------------------------------------------------------------------
| lord snooty @the giant |  Would You Like Space Potatoes With That?       |
| poisoned electric head |              andrew_-_palfreyman@cup.portal.com |
 --------------------------------------------------------------------------
Newsgroups: sci.astro
From: edw@boi.hp.com (Edward Walsh)
Subject: opinions on INTES MK 65 6 inch Maksutov, from ARO Inst.
Date: Thu, 31 Dec 1992 23:12:15 GMT
Organization: Hewlett-Packard / Boise, Idaho
X-Newsreader: Tin 1.1 PL4



Anyone have any opinions on the INTES (a Russian company) 6 inch f/10
Maksutov? It was advertised on page 78 of the January Sky and Telescope.
A complete scope plus mount is $1750.00. I just received the product
literature, and it looks like an excellent telescope for the money.
I'm specifically wondering how it might compare with a 5 inch Astro-Physics
apochromatic refractor, which for the same price you would only get the
doublet tube assembly and case ( or 4 inch triplet tube assembly and
case ) I want to do both planetary and deep sky viewing, and have been
using a Parks 60 mm refractor, with a right angle viewer/adaptor for 1.25 inch
eyepieces, of which I have a number of high quality ones. My present
telescope gives very good planetary images, better than many larger instruments
(both refractor and reflector) I have looked through at star parties.
------------------------------Edward Walsh----Hewlett-Packard Company-------
                              edw@boi.hp.com  Disk Memory Division, MS213
                              (208)323-2174   P.O. Box 39  Boise,Idaho 83707
                              FJ1200'89,XZ550RJ(Vision)'82,DoD#98
From: cecil@physics.unc.edu (Gerald Cecil)
Newsgroups: sci.astro
Subject: H-alpha imaging of the sun
Date: 21 Dec 92 19:34:54 GMT
Reply-To: cecil@physics.unc.edu
Organization: University of North Carolina at Chapel Hill.

We have an Aero-Ektar 610 mm fl camera lens attached to the barrel of 
our 0.6m campus telescope.  It's not doing much at the moment (given that
we are downtown in a rapidly growing community), so I'm interfacing it
to our CCD for student projects.  One daytime project I had in mind was
H-alpha solar imaging ... the pixel scale & CCD format is such that it
just about fills the f.o.v.  I'd use a full aperture Mylar filter to
attenuate flux down to 1/10,000, then place an interference filter a few
inches from the CCD focal plane.  We have a 40 Angstrom FWHM filter.  The
narrowest interference filter we can reasonably afford is about 10 Angstroms
FWHM.  Is this going to be narrow enough to see photospheric details with good
contrast, or do I need to use a birefringent crystal w/ <5 Angstrom bandpass?
(Conditions are probably too hazy here to see prominences under any
circumstances.) The 10 Ang. filter costs about $700, the crystal ~$2500.
---
Gerald Cecil cecil@wrath.physics.unc.edu  919-962-7169 
Physics & Astronomy, U of North Carolina, Chapel Hill, NC 27599-3255 USA
From: j.jahn@abbs.hanse.de (Jost Jahn)
Newsgroups: sci.astro
Subject: Sunspots at 28.12.1992.
Reply-To: j.jahn@abbs.hanse.de
Date: 28 Dec 92 19:05:00 MET
Distribution: sci
Organization: ABBS AstroMail, D-W 2121 Dahlenburg / Germany
X-Version: ZerUU V6.45c

Message-Id:   <25569538032@amterm1.abbs.hanse.de>
Sunspots at 28.12.1992., 0 h UT.

No.    Pos.  Cl.  Ar.  Mag. SF  F  M  X
---------------------------------------
7370 08S 92W Hsx   30   a
7374 10S 23W Cao  130   b
7376 16N 35W Cro   30   b
7378 11N 24W Cso   60   b
7379 11S 00W Cso   60   b    1
7381 05N 02E Dao  230   b
7383 05S 01E Bxo   10   b
7384 02N 27W Axx    0   a


No optical or x-ray flares yesterday observed.


 
--
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------------------------- for amateur astronomers ----------------------------
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Newsgroups: sci.astro
Subject: tide prediction program
From: lbartel@vax1.umkc.edu
Date: 28 Dec 92 13:34:33 CST
Organization: University of Missouri - Kansas City
NNTP-Posting-Host: vax1.umkc.edu

Did anyone ever post the C tide prediction program mentioned in sci.space, Apr.
8, 1992, by Carl Hage?  Or for that matter, are any tide prediction programs
available for FTP?

thanks
Lawrence Bartel
in%"lbartel@vax1.umkc.edu"
From: j.jahn@abbs.hanse.de (Jost Jahn)
Newsgroups: sci.astro
Subject: Sunspots at 23.12.1992.
Reply-To: j.jahn@abbs.hanse.de
Date: 23 Dec 92 21:38:00 MET
Distribution: sci
Organization: ABBS AstroMail, D-W 2121 Dahlenburg / Germany
X-Version: ZerUU V6.45c

Message-Id:   <25146730042@amterm1.abbs.hanse.de>
Sunspots at 23.12.1992., 0 h UT.

No.    Pos.  Cl.  Ar.  Mag. SF  F  M  X
---------------------------------------
7370 09S 25W Hsx   50   a
7372 12S 06E Hax   40   a    1
7374 08S 21E Dao  320   bd   1
7375 14N 81W Dso  100   b    1
7376 17N 32E Bxo   10   b
7378 12N 40E Hax   80   a    1
7379 11S 68E Hsx  100   a
7380 16S 46W Cro   20   b


No optical or x-ray flares yesterday observed.


 
--
------------------------------------------------------------------------------
ABBS AstroMail, the first and most popular German astronomical bulletin board
------------------------- for amateur astronomers ----------------------------
    + 49 5851 7896 / V.21, V.22, V.22bis, V.32, V.42, V.42bis and MNP5
    ------------------------------------------------------------------
From: max@west.darkside.com (Erik Max Francis)
Newsgroups: sci.astro
Subject: Re: Naming asteriods question..
Date: 28 Dec 92 03:42:46 GMT
Organization: The Dark Side of the Moon +1 408 245 SPAM

andromed@Hail.ATM.Dal.Ca (Mike Boschat) writes:

> Why cannot asteriods be named after political leaders, like
> JFK, RFK. I see one named for Dr.Martin Luther King...so
> why  not the two Kennedys', and P.Trudeau one of our
> Canadian Prime Ministers.

There are a _few_ asteroids named after people, I think, such as 
Einsteinia.


  ____  Erik Max Francis -- ..!apple!uuwest!max -- max@west.darkside.com   __
  \  /  1070 Oakmont Dr. #1  San Jose, CA  95117  37 20 N 121 53 W  ACGT  /  \
   \/   Like strategic interstellar conquest games?  Ask about UNIVERSE!  \__/
        Omnia quia sunt, lumina sunt.   All things that are, are lights.
From: ralf@ark.abg.sub.org (Ralf Stephan)
Newsgroups: sci.astro
Subject: Earth-GIFs while new year fireworks?
Date: 02 Jan 93 20:37
Organization: Not Very Ltd.

For a film project of a friend I'm looking desparately for pictures
from high altitude that shows for example a city while the new year
fireworks.  Shuttle preffered but aircraft photos are fine, too.

Has something like that be made?  If so, please contact me or tell me
where to find it.

Many thanks in advance,

ralf
--
*********************************************************
"I like pigs.  Dogs look up to us.  Cats look down on us.
 Pigs treat us as equals."            (Winston Churchill)
From: bscott@lyman.pppl.gov (Bruce Scott)
Newsgroups: sci.astro,sci.physics
Subject: Re: Detecting Second-Order GR Effects in Binary Pulsars
Date: 23 Dec 92 23:39:10 GMT
Reply-To: bscott@lyman.UUCP (Bruce Scott)
Followup-To: sci.astro
Organization: Princeton University, Plasma Physics Laboratory

palmer@sfu.ca (Leigh Palmer) writes:

> [...] My question relates to wave solutions with a symmetry appropriate
>to the problem under examination here, radiation from the PSR 1913+16
>system (I'm not sure I've got that number right, but you know the one
>I mean). The radiation from that system cannot be plane waves.

Any more than EM radiation from orbiting charges (in the *classical*
theory) can be plane waves. How you get from the one to the other in
EM is clear, and it works the same way in GR. That is, as long as lineari-
isation of the theory is appropriate.

The GR system of outgoing waves emanating from two masses in orbit
is exactly analogous to the EM system of outgoing waves emanating from
two charges in orbit (again, classical EM). The usual argument against
incoming waves in this problem is causality. Once you've done that the
linear problem should be asymptotically solvable (wavelength >> orbit
radius as the other small parameter).

Sorry to beg off more detail--I don't have access to Misner, Thorne,
Wheeler for at least another month.
-- 
Gruss,
Dr Bruce Scott                             The deadliest bullshit is
Max-Planck-Institut fuer Plasmaphysik       odorless and transparent
bds at spl6n1.aug.ipp-garching.mpg.de                 -- W Gibson
Newsgroups: sci.astro
From: metares@well.sf.ca.us (Tom Van Flandern)
Subject: Re: Size of Second-Order GR Effects in Binary Pulsars
Organization: Whole Earth 'Lectronic Link
Date: Wed, 23 Dec 1992 02:38:43 GMT


lip@s1.gov (Loren I. Petrich) writes:

> From the period, the projected semimajor axis, the rate of periapsis
> advance, and [beta], one can find four quantities: a, sin(i), M1, and M2.
> If one assumes post-Newtonian GR, one has a _completely_ determined system.

     But the period, and projected semimajor axis, and especially the rate of
periapsis advance and [beta], are determined from observations using a model.
They cannot be determined without assuming a particular model.  If the
assumed model includes gravitational waves, you get one value for periapsis
rate (for example).  If it assumes no waves, you get a different result.
Observations cannot yet say which solution is preferred.

> I'll be gone for the next two weeks after tomorrow...

     I, too, will be on travel for the rest of the month.  I'll save other
responses until then.  Best wishes.  -|Tom|-

-- 
Tom Van Flandern / Washington, DC / metares@well.sf.ca.us
Meta Research was founded to foster research into ideas not otherwise
supported because they conflict with mainstream theories in Astronomy.
Newsgroups: sci.astro,rec.radio.shortwave
From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Solar Geophysical Data Broadcast for 27 December
Organization: University of Lethbridge
Date: 28 Dec 92 05:22:51 GMT

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 362, 12/27/92
10.7 FLUX=125.0  90-AVG=139        SSN=127      BKI=0010 0023  BAI=003
BGND-XRAY=B2.1     FLU1=2.8E+06  FLU10=1.1E+04  PKI=0011 0123  PAI=005
  BOU-DEV=004,004,005,003,003,004,016,028   DEV-AVG=008 NT     SWF=00:000
 XRAY-MAX= B4.8   @ 0252UT    XRAY-MIN= B2.0   @ 1630UT   XRAY-AVG= B2.8
NEUTN-MAX= +004%  @ 2135UT   NEUTN-MIN= -001%  @ 2325UT  NEUTN-AVG= +0.8%
  PCA-MAX= +0.1DB @ 2330UT     PCA-MIN= -0.4DB @ 1810UT    PCA-AVG= +0.0DB
BOUTF-MAX=55421NT @ 1518UT   BOUTF-MIN=55402NT @ 1901UT  BOUTF-AVG=55414NT
GOES7-MAX=P:+163NT@ 2204UT   GOES7-MIN=E:-008NT@ 2240UT  G7-AVG=+103,+020,+013
GOES6-MAX=P:+179NT@ 2205UT   GOES6-MIN=E:-025NT@ 2343UT  G6-AVG=+121,-008,+026
 FLUXFCST=STD:127,129,130;SESC:127,129,130 BAI/PAI-FCST=010,005,010/012,010,010
    KFCST=2223 3111 1112 3111  27DAY-AP=009,015   27DAY-KP=0022 3332 3344 3322
 WARNINGS=
   ALERTS=**MAGSI:16NT@2011UTC
!!END-DATA!!
Newsgroups: sci.astro
From: billn@hpcvaac.cv.hp.com (bill nelson)
Subject: Re: Averting doom
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
Date: Sun, 27 Dec 1992 07:00:33 GMT

pg@sanitas.stortek.com (Paul Gilmartin) writes:
: John McCarthy (jmc@SAIL.Stanford.EDU) wrote:
: : 	     But they say mirrors on Earth or shades in space
: :      potentially could shield our planet from increasing heat
: :      from the sun and delay the catastrophic consequences. Other
: :      possible solutions- building closed environments like the
: :      Biosphere Two project in Arizona... or setting up controlled
: :      Earth-like environments in space.
: : 
: : A more straightforward solution is to move the earth further from
: : the sun as the sun warms up.  What are the easiest ways of doing
: : this?
: 
: Larry Niven, in "A World out of Time", suggested moving a gas giant
: planet into Earth's orbit a few degrees ahead of the Earth.  The
: resulting gravitational perturbation would gently accelerate the
: Earth into a higher orbit.  The gas giant is expendable: its
: substance becomes thermonuclear fuel and reaction mass.

Just like many other things in Niven's writing, his engineering
knowledge is lacking.

I suspect that the tidal forces would destroy the Earth.

Also, to move the Earth into a higher orbit, you would not speed the
Earth up - you would slow it down.  The Earth orbits the sun about
3 miles/second faster than Mars does. 

Bill
Newsgroups: sci.astro,sci.space,sci.physics,sci.environment
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: averting doom
Date: Wed, 30 Dec 1992 20:55:27 GMT
Organization: U of Toronto Zoology

In article <72616@cup.portal.com> lordSnooty@cup.portal.com (Andrew - Palfreyman) writes:
>I like the simplicity of this idea (moving the Earth instead of
>trying to shield it), but what the heck's all this "elastic
>collisions" stuff? ...
>Instead, I'd use the "tame asteroid" in a resonant slingshot
>configuration between (say) Mars and Earth...

That's what he's proposing.  It turns out that gravity-assist maneuvers,
viewed from a distance, have exactly the behavior of elastic collisions
and can be analyzed as such.
-- 
"God willing... we shall return."       | Henry Spencer @ U of Toronto Zoology
       -Gene Cernan, the Moon, Dec 1972 |  henry@zoo.toronto.edu  utzoo!henry
From: steelie@csa.bu.edu (James Howard)
Newsgroups: sci.astro
Subject: Galileo coverup
Date: 1 Jan 93 23:06:42 GMT
Distribution: usa
Organization: Computer Science Department, Boston University, Boston, MA, USA
Originator: steelie@csa


 Ok, so the title is a bit misleading.  But it doesnt seem far from
the truth, according to what you read in the press.   To my eyes,
there is absolutely NO WAY to get 70% of the original mission data
through the backup antenna.    What was the data rate 4 or 5 months
ago.. 40bps?    
 
I dont care how much they throw around terms like "compression" , it
doesnt fool me.   Anyone who has ever used a computer knows that 
a 300bps modem is barely in the same species as a 19.2k.  (for analogy's sake)
 
When will NASA come out and admit that it's busted, and the original mission
is practically dead?

  James

P.S.  I think NASA has great press control.. If I hadn't been reading
this group I would never have know anything substantial was wrong with
Galileo.
Newsgroups: sci.astro
From: duquet@astro.phy.ulaval.ca (Jean-Remi Duquet)
Newsgroups: sci.astro
Subject: Re: Info wanted on Halton Arp
Date: 23 Dec 92 15:21:27 GMT
Organization: Universite Laval, Ste-Foy, Qc, Canada

In article <13759@ntdd-1> meier@Software.Mitel.COM (Rolf Meier) writes:
>In article <724619106.AA00811@contrast.wlink.nl> qsi@contrast.wlink.nl (Peter Kocourek) writes:
>
>>In a recent discussion, someone mentioned to me a certain guy named Halton
>>Arp, who supposedly has "disproven the Big Bang" theory, by showing that
>>there are flows of matter between quasars and galaxies, with the
>>implication that the quasars aren't as far away as thought. He even is
>>supposed to have "photographs" proving this. It would seem to me, without
>>knowing anything further about this, that this is just a misinterpretation
>>of optically close objects. Does anyone know more about (the refutation
>>of) Halton Arp's theories?
>
>I forget the name of his book, but I suggest you start by reading
>it before you start attacking Arp or his alledged theories.
>
>Rolf Meier					Mitel Corporation

Arp's book is called "Quasars, redshift and controversies". It's full of
nice photographs and diagrams showing (alleged) associations between
galaxies and high redshift quasars. According to Arp, these close 
associations are far more numerous than the number one would expect
by chance, and he proposes they are related in some way. This, of course, 
would put modern cosmology in deep s**t.

Arp's ideas are certainly controversial (he wasn't denied telescope time 
for nothing!) but they're well worth reading. Please, do not place him among 
weirdos. He doesn't propose any new, strange theory
except in the last chapter of his book, and even then he does not
pretend they make any sense. He's an astronomer after all, not a
theoritician... But some of the objects he shows are special enough
they could make you feel uncomfortable with the standard interpretation
of redshift as a "fullproof" distance indicator.

(BTW, Arp also published a lot of very good "mainstream" scientific
papers, and a well known "Atlas of peculiar galaxies")

-----
Jean-Remi Duquet
Physics dept.
Universite Laval
Quebec
Newsgroups: sci.astro
From: msb@sq.sq.com (Mark Brader)
Subject: Re: Averting doom
Organization: SoftQuad Inc., Toronto, Canada
Date: Mon, 28 Dec 92 11:20:17 GMT

>>>> Larry Niven, in "A World out of Time", suggested moving a gas giant
>>>> planet into Earth's orbit a few degrees ahead of the Earth.
>>> I suspect that the tidal forces would destroy the Earth.
>> [But] the tidal strain varies as the inverse cube of the distance ...
> It would be fairly easy to calculate the distance that would be
> needed to produce a force comperable to that provided by the Moon. 

Okay.  The planet that Niven used was one of the smaller gas giants,
i.e., either Uranus or Neptune.  I'll do the calculation for Uranus;
the results will be similar in either case.  In some cases the numbers
shown here were calculated with more significant digits than shown.

Uranus's mass is 8.68e25 kg.  The Moon's mass is 7.35e22 kg.  Thus
Uranus outmasses the Moon by a factor of 1180.  The cube root of this
is about 10.6; thus Uranus's tidal effect would be equal to the Moon's
at 10.6 times the Moon's distance, or 2.5 million miles (4.0 million km).
Its gravitational force on the Earth, however, would then be larger
than the Moon's actually is by that same factor of 10.6.

(Its apparent diameter, by the way, would be about 5/8 that of the Moon.
I don't have a figure for its albedo, but it wouldn't surprise me if it
gave more light than the Moon does at the same phase.)

To put that force into perspective, the Sun's mass is 1.99e30 kg, or
23000 times that of Uranus, and it is at 37 times the above distance.  
Thus Uranus's force would be 37*37/23000 = 1/17 the Sun's force on
the Earth -- plenty for a gradual change of orbit.


> Another question. What would happen to the Moon? Would its orbit be
> changed so that it is finally captured by Jupiter?

[Where Jupiter comes in is that, in the novel, the Earth was finally
placed into orbit around Jupiter.  That would be a trickier feat than
just moving it to a different orbit around the Sun, of course.]

Well, it would be attracted along with the Earth, but its orbit would
certainly be seriously perturbed.  In the novel, I believe the Moon
had already been removed or destroyed through another engineering feat.

This thread might be more at home in rec.arts.sf.science, but as I am
not reading that newsgroup these days, I won't be the one to move it.
-- 
Mark Brader 		"Heavier-than-air flying machines are impossible"
utzoo!sq!msb, msb@sq.com				  -- Lord Kelvin

This article is in the public domain.
Xref: sparky sci.astro:13555 sci.space:18487 sci.physics:21944 sci.environment:14127