HDTenEightyP/NetNews huggingface dataset:
From: markv@pixar.com (Mark T. VandeWettering)
Subject: Wanted: Info on Yolo Reflector Design/Fabrication
Organization: Pixar -- Point Richmond, California
Date: Mon, 21 Dec 1992 22:39:24 GMT



For my next telescope project, I was thinking I would try something a bit
more challenging than the traditional Newtonian telescope, so I have been 
considering fabricating an obstruction-free telescope for planetary/lunar
work.  Of these, the Yolo design appears to be the most practical for 
fabrication by amateurs.  But, since I haven't fabricated such a beastie
before, I am seeking information from a mentor....

I have read several articles about Yolo design that have appeared in 
Telescope Making, and can work through most of that mathematics.  I have
used them to reproduce the dimensions for a couple of yolo designs that I 
have seen, but the equations presented by Sasian in issue #37 don't show how
good the resulting system is.  I have toyed with the idea of doing some 
simple raytracing to plot the off axis performance, but would be glad if 
someone else knows of some (cheap) software that could this.

Another thing I am concerned with is the fabrication of the long radius 
mirrors.  The depth of the curves are VERY small, and it seems like it would
be difficult to maintain them within the 6" tolerance needed.  I realize
that once the mirrors are fabricated, the system could be optimized, but if
anyone has any hints on grinding very long radius mirrors, I would be 
appreciative.

In short, if anyone has any details about these topics at all, I would like
to exchange email with you.  I probably won't respond until after the new 
year, but I will respond.

			Thanks mucho for any help
				Mark T. VandeWettering (markv@pixar.com)


Newsgroups: sci.astro
From: clarke@acme.ucf.edu (Thomas Clarke)
Subject: Re: Averting doom
Organization: University of Central Florida
Date: Mon, 28 Dec 1992 13:44:08 GMT

In article <JMC.92Dec26004848@SAIL.Stanford.EDU> jmc@SAIL.Stanford.EDU (John  
McCarthy) writes:
> 
> 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?
> --
> John McCarthy, Computer Science Department, Stanford, CA 94305

I would suggest multiple near misses by asteroids or comets.  
An asteroid going from earth-infinity to earth infinity undergoes
a delta-v of up to 14 miles/second (pardon my English) when on
a suitable orbit.  An earth's mass of asteroids parading by the earth
could change its solar orbital velocity (or equivalent energy)
by 14 mi/sec.  Since solar orbital velocity is 18.5 mi/sec, this could
move the earth entirely out of the solar system. 

Each asteroidal push would be small so there would be no tidal disruptions.
Also the machinery to move an asteroid would be much smaller and
more manageable than that needed to move the earth.

One could even be elegant and use a single asteroid and ping-pong
it back and forth between the earth and another planet.
If the paired planet were Venus for example, then the earth would
move out while Venus moved in toward the sun.  However, since
we can now change the earth's orbit, we could also change Venus's
and the real estate thereon would be too valuable to throw into the
sun when it could be moved into a balmy orbit.  Better to target
one of the gas giants and cause it to move toward the sun.

See a recent issue of Scientific American for a discussion of how
to reach infinity in a finite time using a ping-pong orbiting mass.
Newtonian universe, of course :-)

--
Thomas Clarke
Institute for Simulation and Training, University of Central FL
12424 Research Parkway, Suite 300, Orlando, FL 32826
(407)658-5030, FAX: (407)658-5059, clarke@acme.ucf.edu
Newsgroups: sci.astro,rec.radio.shortwave
From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Solar Geophysical Data Broadcast for 30 December
Organization: University of Lethbridge
Date: 31 Dec 92 09:12:48 GMT

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 365, 12/30/92
10.7 FLUX=125.7  90-AVG=139        SSN=084      BKI=2323 3211  BAI=009
BGND-XRAY=B3.8     FLU1=2.5E+05  FLU10=9.4E+03  PKI=2323 3211  PAI=010
  BOU-DEV=015,027,013,025,023,010,009,005   DEV-AVG=015 NT     SWF=00:000
 XRAY-MAX= C5.2   @ 0939UT    XRAY-MIN= B3.1   @ 0459UT   XRAY-AVG= B8.3
NEUTN-MAX= +001%  @ 2345UT   NEUTN-MIN= -003%  @ 0235UT  NEUTN-AVG= -0.5%
  PCA-MAX= +0.1DB @ 0725UT     PCA-MIN= -0.2DB @ 1950UT    PCA-AVG= -0.0DB
BOUTF-MAX=55422NT @ 1421UT   BOUTF-MIN=55397NT @ 1919UT  BOUTF-AVG=55411NT
GOES7-MAX=P:+111NT@ 1907UT   GOES7-MIN=N:-006NT@ 0949UT  G7-AVG=+077,+033,+008
GOES6-MAX=P:+133NT@ 1859UT   GOES6-MIN=E:-013NT@ 2355UT  G6-AVG=+095,-000,+042
 FLUXFCST=STD:120,115,115;SESC:120,115,115 BAI/PAI-FCST=010,010,010/010,010,010
    KFCST=0003 5000 0003 5000  27DAY-AP=012,011   27DAY-KP=2423 3322 2333 3222
 WARNINGS=*SWF
   ALERTS=**SWEEP:II=2@0255;**SWEEP:II=1@2131UTC;**SWEEP:II=1@0837UTC
!!END-DATA!!
From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Solar Geophysical Data Broadcast for 23 December
Organization: University of Lethbridge
Date: 25 Dec 92 09:31:12 GMT

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 358, 12/23/92
10.7 FLUX=144    90-AVG=138        SSN=120      BKI=1323 2111  BAI=007
BGND-XRAY=B3.3     FLU1=2.1E+06  FLU10=1.1E+04  PKI=2333 2221  PAI=008
  BOU-DEV=007,025,016,024,012,007,006,006   DEV-AVG=012 NT     SWF=00:000
 XRAY-MAX= C1.5   @ 1949UT    XRAY-MIN= B3.1   @ 1040UT   XRAY-AVG= B4.3
NEUTN-MAX= +002%  @ 2150UT   NEUTN-MIN= -001%  @ 2200UT  NEUTN-AVG= +0.2%
  PCA-MAX= +0.1DB @ 2210UT     PCA-MIN= -0.1DB @ 1955UT    PCA-AVG= -0.0DB
BOUTF-MAX=55425NT @ 1520UT   BOUTF-MIN=55397NT @ 1857UT  BOUTF-AVG=55415NT
GOES7-MAX=P:+101NT@ 1932UT   GOES7-MIN=N:+000NT@ 0909UT  G7-AVG=+079,+028,+009
GOES6-MAX=P:+121NT@ 1911UT   GOES6-MIN=E:-020NT@ 0727UT  G6-AVG=+107,-008,+018
 FLUXFCST=STD:140,140,135;SESC:140,140,135 BAI/PAI-FCST=005,015,025/004,004,004
    KFCST=1123 4321 1123 4455  27DAY-AP=009,004   27DAY-KP=2413 2221 2112 2211
 WARNINGS=
   ALERTS=
!!END-DATA!!
From: pwardenier@mswe.dnet.ms.philips.nl
Newsgroups: sci.astro
Subject: Peak Bootide meteor shower 1993?
Date: 22 Dec 92 13:28:43 +0100
Organization: Philips Medical Systems Nederland

Hello there,

I'm looking for information on the expected "peak" of the Bootide- 
(Quadrantide) meteors for next year. (Coming up soon, now!)
To my knowledge, the peak should be close to 11UT, January 3, 1993.
Anyone knows if this is correct?

Thanks, and good luck in 1993 to you all.

Peter

-------------------------------------------------------------------------------
Peter H. Wardenier                    "Think for yourself, question authority"
Philips Medical Systems Nederland
Best, the Netherlands
-------------------------------------------------------------------------------
Newsgroups: sci.astro
From: jmcvey@boi.hp.com ( John McVey         x3638 )
Subject: Anyone scanning negatives ?
Date: Wed, 30 Dec 1992 22:20:46 GMT
Organization: Hewlett-Packard / Boise, Idaho
X-Newsreader: Tin 1.1scd1 PL4

I am working on an astrocamera based on a 12" f/2.5 aero ektar.
The negative size will be 2.25 X 3.25".  Since no CCD can cover
an area this large, and I would love to play with the data
electronically, I have been considering scanning the negative
on a flat bed scanner.

Is there anyone out there trying this?  There are issues like
backside illumination instead of front side, etc.

Just pondering,

John McVey
jmcvey@hpbslq.boi.hp.com
From: j.jahn@abbs.hanse.de (Jost Jahn)
Newsgroups: sci.astro
Subject: Sunspots at 27.12.1992.
Reply-To: j.jahn@abbs.hanse.de
Date: 27 Dec 92 10:00:00 MET
Distribution: sci
Organization: ABBS AstroMail, D-W 2121 Dahlenburg / Germany
X-Version: ZerUU V6.45c

Message-Id:   <25450416590@amterm1.abbs.hanse.de>
Sunspots at 27.12.1992., 0 h UT.

No.    Pos.  Cl.  Ar.  Mag. SF  F  M  X
---------------------------------------
No sunspots on the solar disk or no report available, sorry.


No optical or x-ray flares yesterday observed.


 
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From: charles.baril@synapse.org (Charles Baril) 
Newsgroups: sci.astro
Subject: ADD
Date: 22 Dec 92 15:01:00 GMT
Distribution: world
Organization: SYNAPSE BBS - GATINEAU, QUEBEC - 819-561-4321
Reply-To: charles.baril@synapse.org (Charles Baril) 

                                                                                                                                
Newsgroups: sci.astro
From:  (Carl Soderland)
Subject: Re: astro gifs
Organization: NASA-JSC/EG43
Date: Tue, 29 Dec 1992 17:36:18 GMT

In article <725507498snz@chrism.demon.co.uk>, chris@chrism.demon.co.uk (Chris Marriott) writes:
> 
> > i would like to know whether there is an anonymous ftp site for astro gifs.
> > can anybody help?
> 
> Try "ames.arc.nasa.gov".  Look in directory "/pub/SPACE/GIFS".
> 

The node mentioned contains alot of GIF formatted files, but how do I look at
one of these.  Can anyone provide a source for the necessary imaging software?

Thanks for your help.
Newsgroups: sci.astro,sci.space
From: frisbee@jpl-devvax.jpl.nasa.gov (frisbee)
Subject: Protons and Spacecraft Events
Organization: Jet Propulsion Laboratory (NASA)
Date: Mon, 21 Dec 1992 17:14:27 GMT

To Those in the Know,

	Were there any solar mass ejection episodes on Saturday evening
(DOY 355 at about 0100 UTC)?

	We are trying to correlate a spacecraft incident with high energy
proton events. 

			Thanks,
				Tyler Brown
				frisbee@jpl-devvax.jpl.nasa.gov


Newsgroups: sci.astro
From: mike@rahul.net (Mike Smithwick)
Subject: Re: info sought on Lick observatory "amateur" night
Organization: a2i network
Date: Tue, 22 Dec 1992 01:54:23 GMT

In article <1992Dec19.162706@cs.man.ac.uk> mario@cs.man.ac.uk (Mario Wolczko) writes:
>
>  A couple of years ago I had the opportunity to take the "tour" of
>  the Lick 36" refractor on Mount Hamilton.  Unfortunately, I was
>  unable to be there on a Friday night; I was told the 36" was open to
>  amateurs on Fridays.  Is that still true?  I may get another
>  opportunity in mid-January.  Has anybody been up there on an open
>  night?  Do you get a brief look at some bright object chosen for you
>  or an extended view of something more challenging, perhaps of your
>  own choosing?  Did you need to book in advance? 
>
>
>Thanks
>Mario Wolczko
>

For the past couple of years the traditional Friday viewing nights have
been cancelled due to budget problems. The tickets were free so I don't
know why they just don't sell them for 5 or 10 bucks to offset the cost.

Anyway it was well worth it. The 36" Crossly was open and on that night
aimed at Saturn while they had one of the reflectors at the other end 
of the building aimed at M13. It was magnificent, not to mention the
lovely drive up the mountain.

If you are so inclined Lick still holds their "Music of the Spheres"
program on 4 weekends during the summer. I think the tickets are around
$20. And what they do is have a concert inside the Crossley dome. One
weekend it will be Mozart and the next jazz. Afterwards the scope is
open for viewing. I recommend that over the normal viewing nights
because the crowd is much smaller and they look at more than one object.
The one night I went we saw M57. And buy golly with a scope that size  
the objects really begin to look just like the pictures! 

You also get an official Lick Observatory wine glass with each ticket.

-- 
This message brought to you by the Happy Fun Ball! It's Happy! It's
fun!! It's the HAPPY FUN BALL!!! (Still legal in 16 states)
*** Mike Smithwick - mike@rahul.net 
*** No disclaimer is necessary since I only work for myself, HA! HA! HA! HA!
Newsgroups: sci.astro,sci.space,sci.physics,sci.environment
From: jdnicoll@prism.ccs.uwo.ca (James Davis Nicoll)
Subject: Re: averting doom
Organization: University of Western Ontario, London
Date: Thu, 31 Dec 1992 16:52:33 GMT

In article <1hua4mINN64f@shelley.u.washington.edu> lamontg@stein.u.washington.edu (Lamont Granquist) writes:
>Hmmmm...  In my ASTR class, we did a rough calculation that showed that the
>radius of the Sun would be quite a bit over one AU after it hits the
>giant branch.  If correct, I don't see how mirrors would help us out.  Also,
>according to the ASTR class, the Sun isn't going to explode -- it won't be
>hot enough to fuse silicon, and instead it will shed it outer envelope and
>turn into a white dwarf.

	Hmmm. Anyone know how long it  takes a planet orbiting in the
outer fringes of  a  red giant to evaporate. Granted, red giants are
toasty (By Canadian  standards),  but  wouldn't the plasma  at 1 AU
be pretty thin? How fast would heat/momentum be transfered?

							James Nicoll
Newsgroups: sci.astro
From: clarke@acme.ucf.edu (Thomas Clarke)
Subject: Re: averting doom
Organization: University of Central Florida
Date: Wed, 30 Dec 1992 16:54:11 GMT

In article <JMC.92Dec29211051@SAIL.Stanford.EDU> jmc@SAIL.Stanford.EDU (John  
McCarthy) writes:
> By the way, it seems to me that if the above idea is sound, it settles
> the question of the stability of the solar system - in the negative.
> Very likely an asteroid could be tamed over a sufficiently long time
> with as small an expenditure of delta-v as might be desired.  Once
> tamed it could be used with infinitesimal external force to expel a
> planet from the system.  This tells us that the current trajectory of
> the solar system is arbitarily close to one in which a planet is
> expelled.  Of course, the probability that a planet actually would be
> expelled by this mechanism in some particular finite time is extremely
> low, because maintaining the required sequence of encounters requires
> an improbable precision in the initial conditions.  I suppose a lower
> bound on the probability could be computed and from it an expected
> upper bound on the gravitational lifetime of the solar system could be
> obtained.

Hurray!  My Douglas Adamsian speculations were not totally hougwash :-)

More seriously, In the most recent Sci Am or Sky and Telescope 
(I was reading both last night and get confused) there is piece about
work by the group at MIT with the special purspose celestial 
mechanical computer (sorry for vagueness, but mags are at home)
concerning chaotic dynamics in the solar system.  The original work
is reported in a July issue of Science, but I missed the original.

The upshot is they simulated the solar system's dynamics for some 100
million years and made several runs after slightly (1 millimeter !)
perturbing the position of each planet.  The article showed a graph
of the expeonential (hence chaotic) divergence in the position of
Pluto for the 1 mm perturbation in Venus's position.  After 100 myear
Plutos position had changed by quite some million miles.

Hey, maybe Pluto would be better than Ceres.  Kick a periodic comet
so it ricochets of Pluto.  Pluto Ricochets off Neptune, then off Jupiter
and into the inner solar system where it becomes tame!

--
Thomas Clarke
Institute for Simulation and Training, University of Central FL
12424 Research Parkway, Suite 300, Orlando, FL 32826
(407)658-5030, FAX: (407)658-5059, clarke@acme.ucf.edu
From: j.jahn@abbs.hanse.de (Jost Jahn)
Newsgroups: sci.astro
Subject: Sunspots at 29.12.1992.
Date: 29 Dec 92 18:46:00 GMT
Reply-To: j.jahn@abbs.hanse.de
Distribution: sci
Organization: ABBS AstroMail, D-W 2121 Dahlenburg / Germany
X-Version: ZerUU V6.45c

Message-Id:   <25658392636@amterm1.abbs.hanse.de>
Sunspots at 29.12.1992., 0 h UT.

No.    Pos.  Cl.  Ar.  Mag. SF  F  M  X
---------------------------------------
7374 11S 57W Hsx  120   a
7376 15N 48W Dao   40   b
7378 11N 38W Hsx   50   a
7379 10S 12W Cso   60   b
7381 04N 10W Dso  240   b
7383 05S 12W Cro   20   b
7385 23S 56W Axx    0   a


Optical and x-ray flares in 28.12.92.

Date     Beg. Max. End   Posit. Xray Opt
----------------------------------------
28.12.92 0640 0651 0702 14N 40W C2.5 1B


 
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ABBS AstroMail, the first and most popular German astronomical bulletin board
------------------------- for amateur astronomers ----------------------------
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From: andromed@Gale.ATM.Dal.Ca (Mike Boschat)
Newsgroups: sci.astro
Subject: Any Ursid meteors seen ?
Date: 27 Dec 92 16:27:22 GMT
Organization: ATM, Dalhousie University, Halifax, NS, Canada

Hello;

 Did anyone see any Ursid meteors on Dec.21-23 ?  I observed
on the 22/23 from 0100-0300 UT but saw 8 meteors, 5 were Ursids
the rest sporadic. The brightest Ursid was of mag. -0, blue,
with a length of 8 degrees. The rest were +1 and +2 Mv.
 My observations were made from Halifax, Nova Scotia, Canada
at 44 N 63 W and 58 meters above sea level.
 Thanks in advance...

                                       Clear skies for 1993

                                         Mike Boschat
JOHN F. KENNEDY 
    ASTRONOMICAL OBSERVATORY
From: Richard.Mathews@West.Sun.COM (Richard M. Mathews)
Newsgroups: sci.astro
Subject: Re: Solstice Question (simple)
Date: 24 Dec 92 21:22:09 GMT
Organization: Sunsoft Inc., Los Angeles, CA.
NNTP-Posting-Host: astro
Originator: richard@astro

goris@hpfcso.FC.HP.COM (Andy Goris) writes:

>   As everyone knows, winter solstice is the day with the shortest time 
>   between sun-rise and sun-set.  However, it is neither the day
>   of latest sun-rise nor earlist sun-set.  Why is this?  I'm having
>   trouble picturing in my mind what happens  as the earth rotates
>   around the sun, and how the tilt of the earth could cause this.
>   One of my coworkers believes the shift is caused by the fact the
>   earth is not in perfectly circular orbit around the sun.  I can't
>   see how our elliptical orbit could cause this effect.

The first thing to realize is the time at which the sun crosses the
meridian is not constant.  The rate of change of the time of sunset (or
sunrise) is the rate of change of the time of the meridian crossing plus
(or minus) one half of the rate of change of the length of the day.  And
in December, the rate of change of the time of the meridian crossing is
faster than at any other time of year.

>   I believe the answer to this question would also explain that 
>   photograph of the sun moving in a figure-8 pattern you see in S&T every 
>   so often.  It's a time exposure where, for one year, the shutter is 
>   openened at the same time every day. I understand how the earths tilt 
>   causes the up-down movement in the figure-8, but what causes the 
>   left-right movement, and why does it have a period of twice/year?

Exactly.  Sometimes the sun is farther west and crosses the meridian
earlier, and sometime is is farther east and crosses the meridian later.
The reason for this is a combination of the sun moving faster along the
ecliptic in winter than in summer because we are closer to the sun, and
the projection of the sun's ecliptic motion onto the equator is greater
at either solstice because (a) the motion is due west-east rather than
at an angle as at the equinox and (b) the closer you are to a pole the
more longitudinal lines you cross with the same motion.

>   Here's some other related questions:

>   1. If you live on the equator, is the length of the day always ~12 hours?

Yes, but the time of sunrise and the time of sunset both shift by +/- 15
minutes.  And due to refraction, the length of the day is a few minutes
longer than 12 hours.

>   2. If you live on the equator, do you really get effectively two
>      summers (when the sun is highest in the sky), that occur on the
>      two equinoxes?  

The difference in light energy received on the equator at an equinox
(cos(0)=1.0) and the energy received at a solstice (cos(23 degrees)=.92)
isn't all that significant.  Compare that with the difference for me
(latitude=34 degrees) of light received in summer (cos(34-23)=.98) and
in winter (cos(34+23)=.55).

     Richard M. Mathews			F oster 
					 E stonian-Latvian-Lithuanian
Richard.Mathews@West.Sun.COM		  I ndependence and
					   F reedom!
Newsgroups: sci.astro
From: rlm@sunlight.Physics.UIowa.Edu (Robert Mutel)
Subject: Anyone for squash at AAS meeting next month?
 
Organization: Department of Physics and Astronomy, University of Iowa
Date: Tue, 22 Dec 1992 20:36:36 GMT

Is anyone interested in playing squash at the AAS meeting in Phoenix between
2 and 6 January? (The Hilton hotel has squash courts). 

-- 
Robert Mutel
Department of Physics and Astronomy
University of Iowa
Iowa City IA 52242

Telephone: 319-335-1950      FAX: 319-335-1753
Email: rlm@sunlight.physics.uiowa.edu  (internet) 
       iowa::rlm (span)
From: j.jahn@abbs.hanse.de (Jost Jahn)
Newsgroups: sci.astro
Subject: Sunspots at 25.12.1992.
Date: 25 Dec 92 17:47:00 GMT
Reply-To: j.jahn@abbs.hanse.de
Distribution: sci
Organization: ABBS AstroMail, D-W 2121 Dahlenburg / Germany
X-Version: ZerUU V6.45c

Message-Id:   <25309242751@amterm1.abbs.hanse.de>
Sunspots at 25.12.1992., 0 h UT.

No.    Pos.  Cl.  Ar.  Mag. SF  F  M  X
---------------------------------------
7370 09S 51W Cso   70   b    3
7372 12S 21W Hrx   10   a
7374 09S 05W Dai  250   b    3
7376 17N 07E Axx    0   a
7378 12N 14E Hsx   60   a
7379 11S 41E Hsx   80   a
7381 07N 44E Dao   40   b    1
7382 15S 59E Axx    0   a

Explanations of spot columns:
No.  Running number of sunspot group.
Pos. Position in Latitude and Longitude.
     N - North, S- South, E - East, W- West.
Cl.  MacIntosh classification.
Ar.  Area in 10-6 of visible hemisphere.
Mag. Magnetic Classification.
     a - alpha, b - beta, bg - beta/gamma,
     g - gamma, bd - beta/delta, bg - gamma/delta
     bgd - beta/gamma/delta.
SF   Number of subflares.
F    Number of optical flares. (importance > 1).
M    Number of medium x-ray eruptions.
X    Number of strong x-ray eruptions.


No optical or x-ray flares yesterday observed.


 
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------------------------- for amateur astronomers ----------------------------
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Xref: sparky sci.misc:1918 sci.astro:13381 sci.geo.geology:2613 sci.physics:21664 alt.sci.planetary:432
From: williams@kingcong.uwaterloo.ca (Carol Hulls)
Subject: Women Scientists
Followup-To: williams@kingcong.uwaterloo.ca
Originator: williams@kingcong.uwaterloo.ca
Organization: University of Waterloo
Distribution: ont
Date: Sun, 3 Jan 1993 19:11:25 GMT

Hello,

I'm looking for the names of a few semi-famous women scientists.
Everyone I have asked is able to name Marie Curie and Roberta Bondar.
Beyond that I seem to be stuck.  If you know of someone, please
email me her name, and a little bit about her.  

			Thanks, Carol Hulls

Newsgroups: sci.misc