HDTenEightyP/NetNews huggingface dataset:
From: richmond@spiff.Princeton.EDU (Stupendous Man)
Subject: Re: Quantisation of REDSHIFT
Originator: news@nimaster
Organization: Princeton University
Date: Fri, 8 Jan 1993 17:41:07 GMT

 baresson@cbnewsi.cb.att.com (pete.oram) writes:
 
po> 4. What other explanations are there for the redshift quantisation if it
po> doesn't just correspond to the velocity of the source?

  Tom Van Flandern replies: 

TVF> If redshifts are quantized for us and are caused by velocity alone, 
TVF> they cannot be quantized for most other observers.  
TVF> So either we are in a special place in the universe, 
TVF> or cosmological redshift is not due mainly to expansion velocity.  

  I just hate getting pulled into these cosmological discussions, but
I can't resist.  If it is true that galaxy redshifts are "quantized",
and I don't believe it yet, here's a simple explanation for the fact
that retains the "redshift due to velocity alone" idea:  galaxies 
occur in clumps, with gaps in between the clumps containing few galaxies.
If the clumps occur at regular intervals, then any observer, anywhere,
will see "quantized redshifts" due to the expansion of the universe.
N'est-ce pas?

  Now, before people jump on me, I admit that the redshift "quanta"
are so small (only 30-80 km/s) that this explanation seems extremely
unlikely - we DO see evidence for clusters of galaxies, and voids
between the clusters, but with velocities >= 1,000 km/s separating
the voids and clusters.  Therefore, Tifft's alleged quanta, if they
exist, must be due to something else.

  However, I couldn't resist pointing out a counter-example to Tom's
statement above :-)

  Speaking of astronomy, I read the article in today's (Friday's) NY Times
on a presentation of COBE results from the AAS meeting.  No one here at
Princeton could figure out what the article was saying.  It SEEMED to
say something like "COBE measurements of the microwave spectrum show 
a really, really good fit to a blackbody spectrum.  Therefore, nothing
exciting happened in the universe after the BB for at least one year."
Can someone at the AAS meeting make things more clear?

-- 
-----                                                    Michael Richmond
"This is the heart that broke my finger."    richmond@astro.princeton.edu

Newsgroups: sci.astro
From: DPierce@world.std.com (Richard D Pierce)
Subject: Re: SCTs and their moveable mirrors.
Organization: The World Public Access UNIX, Brookline, MA
Date: Wed, 13 Jan 1993 00:52:40 GMT

In article <C0rD9F.CMr@cantua.canterbury.ac.nz> adm@phys.canterbury.ac.nz writes:
>
>The astronomers here have a 1m telescope that uses a C8 for a finder,
>and they've done just this, except that when they found the right place
>for the mirror, they flooded it's cell with epoxy resin and stuck it in
>place! I've never seen what this scope can do myself, but it is reputed
>to be very good.
>

Sounds like a great idea, except for a couple of flaws (not that you guys
did it wrong, but anyone who might want to try this had better worry about
these problems.

First, A large amount of epoxy can release a fair amount of heat while
curing. This could possible distort things, then leave them that way forever.

Second, epoxy is something of a thermal insulator (not a great one,
though), adding a lot of epoxy can add a fair amount of thermal mass,
reducing performance while the scope is trying to reach thermal equilibrium.

Third, your screwed if it goes somewhere where you don't want it!

I've recently acquired a used 8" SCT with such a problem. One way I fix it
is that I notice the error is different if I approach final focus from
outside as oppposed to inside. So my technique is to find focus, overshoot
slight to the outside, and back into it. Seems to reliably work. In my
case (a Dynamax 8000 that I picked up for a couple of hundred dollars),
there may not be enough back focus available for a new focusser and a
guider and a focal reducer and a camera.


-- 
|                Dick Pierce                |
|    Loudspeaker and Software Consulting    |
| 17 Sartelle Street   Pepperell, MA  01463 |
|       (508) 433-9183 (Voice and FAX)      |
Newsgroups: sci.astro,alt.sci.planetary
From: cain@geomag.gly.fsu.edu (Joe Cain)
Subject: Tektites
Followup-To: sci.astro
Summary: question on dynamics
Organization: Florida State University Geology Dept.
Date: Mon, 11 Jan 93 03:13:43 GMT

	Someone recently brought up the question of the origin of
tektites having heard only of the original hypothesis of their being
from the Moon. I have not read the pertinent references yet (appended
below) but wonder if the question is completely closed considering the
statement in Hartmann (p. 177) "Their origin is very mysterious." That
is, assuming as is presently thought that they are debris from
terrestrial impacts and represent terrestrial material ejected to a
high altitude, has the dynamics of such been properly modelled? Also,
even though a meteorid impact produces debris primarily that of the
target surface, there must be a small percentage from the original
projectile. Have no tektites been shown to be of meteoric origin in
composition? 

Faul, H., Tektites are terrestrial, Science, 152, 1341, 1966.

O'Keefe, Tektites, U. of Chicago Press, 1963
   "	, The Tektite problem, Scientific American, February, p. 116,
	1976. 

Taylor, S. R., and M. Kaye, Genetic significance of the chemical
	composition of tektites: a review, Geochim/Cosmochim Acta, 7, 34,
	1969.

Hartmann, Moons and Planets, 3rd edition, Wadsworth, 1993.



Joseph Cain		cain@geomag.gly.fsu.edu   
cain@fsu.bitnet		scri::cain
(904) 644-4014		FAX (904) 644-4214 or -0098
From: apryan@vax1.tcd.ie
Newsgroups: sci.astro
Subject: Re: Perseid Shower Peak?
Date: 13 Jan 93 01:12:37 GMT
Organization: Trinity College Dublin

I heard the peak would be 01:00UT on August 12 (on an
IAUC I think). Initially the 1992 peak was to be about 23:))UT
on Aug. 11 but it ended up coming circa 19:00UT and
someone later realised something about the relative orbits
of Earth and the shower which explained this.
Newsgroups: sci.astro.fits
From: bschlesinger@nssdca.gsfc.nasa.gov (Barry Schlesinger)
Subject: NOST FITS User's Guide new version 3.0
News-Software: VAX/VMS VNEWS 1.41    
Organization: NASA - Goddard Space Flight Center
Date: Thu, 7 Jan 1993 14:07:00 GMT

Version 3.0 of the NOST FITS User's Guide is now available.  It 
describes binary tables as defined in the proposed BINTABLE extension, 
as opposed to the preliminary NRAO A3DTABLE proposal that was
discussed in version 2.  The discussion of new extension proposals has
been brought up to date.  A new section has been added on World
Coordinates, based primarily on the Wells and Hanisch proposal and
AIPS memos 27 and 46; among its contents are the CD matrix proposal
and an outline of projections from the celestial sphere to the data
array plane.  The section on network resources has been greatly 
expanded.  Changes and additions have been made throughout the text.

Version 3.0 is currently available in printed form only.  Steps are
under way toward producing an electronic version.  The initial process
will be to try to capture the PostScript file, but the goal is to
eventually have the Guide available in the same three forms as the
Standard: LaTeX, PostScript and flat ASCII.  Suggestions on how to
expedite this process are welcome.  The native format is Microsoft
Word on Macintosh. 

A copy of version 3.0 will be sent to all who were sent a copy of 
version 2.0.  Others may obtain a copy from the NOST librarian.  The 
contact points are the following:

(Postal) NASA/OSSA Office of Standards and Technology
	 Code 633.2
	 Goddard Space Flight Center
	 Greenbelt MD 20771
	 USA

(Internet) nost@nssdca.gsfc.nasa.gov
(DECnet) NCF::NOST

Telephone: +1-301-286-3575 8 a. m. - 5 p. m., U. S. Eastern Time
	If the Librarian is unavailable, a phone mail system takes the
call after four rings. 


					Barry M. Schlesinger
					Coordinator,
					NASA/NSSDC
					NOST FITS Support Office
		
+1-301-513-1634				fits@nssdca.gsfc.nasa.gov
					NCF::FITS
From: Geoff.C..Marshall@f159.n633.z3.fidonet.org (Geoff C. Marshall)
Newsgroups: sci.astro.fits
Subject: Re: What new innovation, software or products do you want to see?
Date: Sun, 10 Jan 1993 23:14:02

 se> What type of new innovation, software or products do you want to be
 se> introduced to the market place.  No answer is stupid.  The things
 se> that might be unachievable to you, might be very easy to produce
 se> by others.  You could become part of history by initiating the process
 se> of innovation.

There currently exists many databases with many forms of information,
commercial and otherwise.  Most of these databases are in the form of some
RDBMS such as Oracle, Informix etc.  The tables in these databases are
designed for a specific purpose and are usually moderately static.

Contemplate a software product that 'joined' information from many databases
and used (perhaps) AI techniques to 'look for' correspondences.  Maybe we
would find that driving a Ford caused canced (for example - no suggestions
of accuracy here !), or some other unexpected or unanticipated
correspondence.  Maybe the price of AT&T shares goes up when the moon is
full, maybe there are connections between certain things that we cannot
anticipate because we (as humans) do not think that way.

I don't know of this is the sort of thing that you wanted.... but it is an
interesting and potentially very useful idea....

Count.



... "Scotty, beam me up another Blue Wave message."
 * Origin:  The Gate - Melbourne, Australia - +61-3-879-9082  (3:633/159.0)
Newsgroups: sci.astro
From: hinz@picard.med.ge.com (David Hinz (hinz@picard.med.ge.com))
Subject: Re: Universal Time Clock
Organization: GE Medical Systems, Magnetic Resonance
X-Newsreader: TIN [version 1.1 PL6]
Date: Fri, 8 Jan 93 11:28:22 GMT

Danny (wdb3926@zeus.tamu.edu) wrote:
: I'm looking for a Universal Time Clock that receives radio
: signals to give universal time accurately.  I have checked the
: Thomas Register for company names....no luck.
: These clocks are used at most observatories.
: 
: Does anyone know who carries the clocks?
: Dan

As I recall (fuzzily), UCT is brodcast at octaves above, below, and including
250MHz.  These frequencies are certified primary standards, as well, so
the're as accurate as it gets.  Any radio that can receive these frequencies
would be fine, most short-wave sets can pick up 3 or more.

Anyone have the correct frequencies if I'm off?  Otherwise I can find out
with a phone call.

--

Dave Hinz  -  Opinions expressed are mine, not my employer's.  Obviously.
Newsgroups: sci.astro,sci.space
From: apryan@vax1.tcd.ie
Subject: Perseid storms 1993/1862?
Organization: Trinity College Dublin
Date: Fri, 8 Jan 1993 02:47:53 GMT

We are looking for information to help get some idea of what to expect with
regard to the Perseid meteor storm predicted for August 1993. We presume that
the comet's return to perihelion in 1862 (what date was perihelion?) should
have caused storm levels also, particularly given its close approach of 32
million miles, but no one seems to have seen anything. In his 1988 book "Meteor
Showers", Gary Kronk, only refers to good rates (up to 215/hour, not really
storm rates) in 1861 and 1863 (no rates are given for 1862).

Was there a Full Moon on Aug. 9 1862 i.e. was moonlight the problem?

Did the comet and Earth's orbits not cross as closely as they do now?

Could it be that as the storm only lasts about 1 hour, an unpopulated part of
the dark side of the Earth was facing into the radiant (or poor weather)?

Does anyone have the precise times of maxima and Full Moons from 1860 to 1864?
It would then be interesting to see where in the world was favoured for seeing
the very best activity and if those places recorded anything unusual or not.

T.Ryan and D.Moore, Astronomy Ireland, P.O.Box 2888, Dublin 1, Ireland.
Newsgroups: sci.astro
From: Bobg@cullen.demon.co.uk (Bob Gregory)
Subject: Bright planet in the evening sky
Distribution: world
Organization: Cullen Crosswords
Reply-To: bobg@cullen.demon.co.uk
X-Mailer: Simple NEWS 1.90 (ka9q DIS 1.19)
Date: Sat, 9 Jan 1993 13:12:10 +0000


I'm not an astronomical type so would one of you experts please satisfy
my curiosity ?

Thank you !

Each evening at about this time of year one sees a very bright planet
lying to the southwest from my position at around 52N. It is at, I would
judge  45 to 50 degreed up from the horizontal. It is very bright.

Is it Mercury ? Is it Jupiter ? I don't suppose it's Venus - that's
called "The Morning Star", is that right.

Whichever planet it is - how far from Earth at this time of respective
orbits and what is the maximum and minimum respective distances from it
to us at different times.

Last, whichever it is, what distance please from the sun at aphelion, at
perihelion.

Thank you teacher

Regards

Bob Gregory
Newsgroups: sci.astro
From: travis@binah.cc.brandeis.edu (Leopold Travis)
Subject: Re: Calendar for 1993
Reply-To: travis@binah.cc.brandeis.edu
Organization: Brandeis University
Date: Tue, 5 Jan 1993 06:01:07 GMT

In article <1993Jan5.053400.29449@news.cs.brandeis.edu>, 
travis@binah.cc.brandeis.edu (Leopold Travis) writes:
>In article <1992Dec30.110210.1683@flint.comlab.ox.ac.uk>, 
>sharon@comlab.ox.ac.uk (Sharon Curtis) writes:
>....
>>Apr. 25   Mars at aphelion
>
>Is this correct?  According to the figures in the 1992 World Almanac (mean
>longitude of 297.87 degrees on 19 April 1990, longitude of perihelion
>335.81 degrees, mean daily motion of 0.524 degrees), I come out with Mars
>at aphelion sometime around 11 June 1993.

But I am wrong.  Arithmetic error.  As Homer Simpson would say, d'hooo!! 
Sorry to waste the net's time.

--
Leopold Travis
travis@binah.cc.brandeis.edu
From: J.JAHN@ABBS.zer.sub.org
Newsgroups: sci.astro
Distribution: world
Subject: Sunspots at 05.01.1993.
Date: 5 Jan 93 18:47:00 +0100
X-Gateway: ZCONNECT AB ABBS.hanse.de [UUCPfZ V3.8a U004]

Sunspots at 05.01.1993., 0 h UT.

No.    Pos.  Cl.  Ar.  Mag. SF  F  M  X
---------------------------------------
7386 04S 29E Cho  270   b
7387 22S 29E Cao  150   b
7388 07S 57W Dao  120   b
7390 12N 48W Axx    0   a
7391 08S 76E Cso  120   b
7392 14N 20E Axx    0   a
7393 18S 15E Axx   20   a


No optical or x-ray flares yesterday observed.



From: calloway@hplvec.LVLD.HP.COM (Frank Calloway)
Date: Fri, 8 Jan 1993 18:36:30 GMT
Subject: Re: Super Polaris vs. Classic C8?
Organization: Hewlett-Packard Co., Loveland, CO
Newsgroups: sci.astro

The fork-mounted C8s have setting circles that are *much* larger
and easier to read than those on the Super Polaris mount.  If the
use of setting circles to locate objects is important to you, the
C8 on the fork mounting may be desirable.

Frank Calloway
From: edb@hpgrla.gr.hp.com (Ed Beshore)
Date: Fri, 8 Jan 1993 00:02:45 GMT
Subject: Re: SCT vs. Newtonian
Organization: Hewlett-Packard, Greeley, CO
Newsgroups: sci.astro

I seem to recall that the December 92 or Jan 93 issue of Sky and
Telescope had a rather complete review of the Meade reflectors.
Should answer all of your questions.

--------------------------------------------------------------
Edward Beshore                     
Hewlett Packard Company            Voice:       (303) 350-4826
700 71st Avenue                    FAX:         (303) 350-4675
Greeley Colorado, 80634            email: edb@hpgrla.gr.hp.com
--------------------------------------------------------------
Newsgroups: sci.astro,sci.physics
From: scip2124@nusunix1.nus.sg (MARC PAUL JOREF VAN LOO)
Subject: Re: That Great Pulsar Timing Flame War
Organization: National University of Singapore
X-Newsreader: TIN [version 1.1 PL6]
Date: Tue, 12 Jan 1993 10:47:52 GMT

Tom Van Flandern (metares@well.sf.ca.us) wrote:
: 
: > [ST] I believe the error in Yu is that statement 3.1 (momentum is
: > conserved) does not imply 3.2 (reduced quadrupole moment vanishes).
: 
:      This is right at the heart of Yu's argument.  Your statement is not
: obvious.  Could you please elaborate carefully, since a lot hinges on this
: matter.
:

    I agree. Buchdahl, in his seventeen simple
    lectures on GR (1982) cites exactly the same
    argument to cast doubt on the binary pulsar
    radiation. Besides that, he lists 3 or 4 more
    quite pursuasive doubts.

    Can anybody tell me whether any of these doubts
    have been removed by more recent work? And if so,
    which ones are they?

    (I hope I didn't miss replies on previous 
    `Buchdahl' postings; I haven't read the net lately).

    marc.


 
Newsgroups: sci.astro
From: pg@sanitas.stortek.com (Paul Gilmartin)
Subject: Re: ames.arc down ???
Organization: Storage Technology Corp.
X-Newsreader: TIN [version 1.1 PL7]
Date: Thu, 7 Jan 1993 07:24:44 GMT

Mike Boschat (andromed@cs.dal.ca) wrote:
:  Tried to get the asteriod images after typing cd pub/SPACE/GIF I got the
: prompt then typed ls, it said 0 bytes..thus no gif images at all were
: listed is this site down ?

I had same experience roughly same time;  it's fine now, however.
From: meh@atlantis.Unify.Com (Mark E. Hansen)
Newsgroups: sci.astro
Subject: Distance between Earth and other planets
Date: 4 Jan 93 19:15:08 GMT
Distribution: usa
Organization: Unify Corporation, USA.

It seems that, while trying to get good looks at some of the planets that
are visible throughout the year, it would be very useful to know how close
the planets are to Earth.  I believe the closer they are, the better the view.

Is this really true? 

The views that I've had of Saturn, Jupiter and Mars have left a lot to be 
desired. I'm looking into what I can do with my equipment, but wonder how much 
of this might have to do with the distance of the planets.

Thanks for any help,

-- 
Mark E. Hansen                                     internet: meh@Unify.Com
Unify Corporation                           ...!{csusac,pyramid}!unify!meh
3901 Lennane Drive                                   voice: (916) 928-6234
Sacramento, CA 95834-1922                              fax: (916) 928-6401

          ** If there is no solution, there is no problem **
Newsgroups: sci.astro
From: markv@pixar.com (Mark T. VandeWettering)
Subject: Re: Making an ALUMINUM telescope mirror
Organization: Pixar -- Point Richmond, California
Date: Wed, 6 Jan 1993 19:33:11 GMT

danube@max.physics.sunysb.edu writes:


>   Hello everyone.  I am nearly done making a small "bowling ball" 
>telescope, for which I bought a 4.25" F:4 mirror.  I have however, been
>thinking about grinding my own.  
>   Over the holiday break I ran across an article in the Amateur Scientist
>Department in the November 1963 issue of Scientific American.  The article
>described the grinding and polishing of an all ALUMINUM telescope mirror.
>Has anyone here actually done this?  With good results?  Any advice or
>technical references would be appreciated greatly.
>   Thanks.

I have not read the article in question, but this subject does come up 
occasionally in this news group.  The issues that seem hard to resolve are
the relatively high coefficient of expansion of aluminum (or most metals)
make them more difficult to both create and retain an accurately figured
surface.  As polishing proceeds, heat from the friction will cause a 
metal mirror to expand many times the desired accuracy, and you will merely
be "guessing" as to the resulting figure.


				Mark
From: f_markwort@ccsvax.sfasu.edu
Newsgroups: sci.astro
Subject: wormholes
Date: 4 Jan 93 21:43:41 CST
Organization: Stephen F. Austin State University


OK, we might as well get this over with.  I imagine the net will be swim-
ming with wormhole questions after the new Star Trek episode.  So, what
are they, are they real, can do travel in space-time using them, and more
importantly, can you survive to tell about it?
Newsgroups: sci.astro
From: aad@siemens.com (Anthony Datri)
Subject: Re: Galileo's antenna
Organization: Siemens Corporate Research, Princeton (Plainsboro), NJ
Date: Sat, 9 Jan 1993 04:11:20 GMT

>Supposed that the stuck ribs may be freed, what are the odds that the 
>HGA is permanently deformed due to having been suspended for such a 
>long time? Is it flexible enough to regain its original shape?

If it's flexible enough to deploy after launch, I'd expect so.
-- 

======================================================================8--<
From: tim@nijinsky.ipac.caltech.edu (Tim Conrow)
Newsgroups: sci.astro
Subject: Re: Is the Milky Way a Barred Spiral?
Date: 4 Jan 93 12:27:24
Organization: California Institute of Technology
NNTP-Posting-Host: nijinsky.ipac.caltech.edu
In-reply-to: gwc@csd4.csd.uwm.edu's message of 4 Jan 1993 02:03:10 GMT

In article <1i85suINN1s2@uwm.edu> gwc@csd4.csd.uwm.edu (Greg F Walz Chojnacki) writes:

   From article <1993Jan3.210002.19066@ee.ubc.ca>, by davem@ee.ubc.ca (Dave Michelson):
   > Not too long ago (but I don't remember where :-(, I read that some astronomers
   > had convinced themselves that our Galaxy is actually a barred spiral.  I haven't
   > seen any references to it since, though.  Does anyone else recall seeing such a
   > report or care to comment?
   > 
   > Previously, the evidence of spiral arm tracers such as O and B stars and
   > HII regions had suggested that our galaxy possesses a rather tightly wound
   > spiral structure...  

   Leo Blitz (U of MD) and David Spergel (Princeton) reported in Jan. 90 (at
   the AAS meeting) that their analysis of the motion of hydrogen clouds and
   found that outer clouds move in nearly circular orbits in the outer regions,
   but more and more elliptically as one looked closer to the galaxy's center.
   Their interpretation is that there is indeed a bar. 

   Sorry, I can't tell you where they published their results; I only heard 
   their talk at the AAS meeting.

   Greg

"Detection of a Large-Scale Stellar Bar in the Milky Way"
Martin D. Weinberg (UMass)
ApJ 384:81

The author uses AGB star tracers selected using IRAS variable sources and
highly robust harmonic analysis.

-- Tim
From: irwin@juliet.caltech.edu (Horowitz, Irwin Kenneth)
Newsgroups: sci.astro
Subject: Re: Mt. Palomar Info Needed
Date: 7 Jan 1993 08:59 PST
Organization: California Institute of Technology
Distribution: world
NNTP-Posting-Host: juliet.caltech.edu
News-Software: VAX/VMS VNEWS 1.41    

In article <1993Jan6.182620.6109@TorreyPinesCA.ncr.com>, bw@TorreyPinesCA.ncr.com (Bruce White 3807) writes...
>In the past, the Oceanside Photo Telescope Club has been able to 
>arrange to have a tour of the scope for club members.
>--- Bruce
> 
Folks,
	I am currently in Phoenix at the AAS meeting, but when I return, I'll
post some info concerning tours at Palomar.
-------------------------------------------------------------------------------
Irwin Horowitz                        |
Astronomy Department                  |"Whoever heard of a female astronomer?"
California Institute of Technology    |--Charlene Sinclair, "Dinosaurs"
irwin@iago.caltech.edu                |
ih@deimos.caltech.edu                 |
-------------------------------------------------------------------------------
From: pfritsch@skid.ps.uci.edu (Paul Fritschle)
Subject: Online table of RA and Decl?
Summary: need online table of stellar/messier coordinates
Newsgroups: sci.astro
Organization: Miskatonic University Department of Computer Science
Distribution: na
Date: 10 Jan 93 01:32:55 GMT

Is there an online catalog listing RA and Decl for bright stars and
Messier objects? I had one from an old college course, but managed to
throw it away just before getting a new telescope for Christmas!
Also, if someone could e-mail me instructions for aligning the
telescope for use--it has an equatorial mounting.

--

Paul Fritschle                                         pfritsch@skid.PS.UCI.EDU
                 Have you hugged YOUR shoggoth today?
Newsgroups: sci.astro