Program- Buying the Christmas Telescope
Don Surles & others
To determine the correct scope to give someone, Don asks the
following questions:
Who’s going to use it?
Age and experience are considered here. Someone under 10 years
old is probably better off ith a department store scope such
as a 2” altazimuth refractor. As age and /or proficiency increase,
a 6” Dobsonian could be considered. For more advanced observers, an equatorial
mounted Newtonian or one of the many Catadioptric designs might be considered.
What’s it going to be used for?
For general astronomical observation at nominal cost, it is hard to
beat an 8” Dobsonian. It is easy to set up and transport, and allows
direct slewing to the target. As you get more specific activities,
the requirements change. For deep space observing you would want at least
12” of aperture. Don reminds us that light gathering increases exponentially
with each inch of aperture. ( A onefold increase of aperture gives a fourfold
increase of light gathering.)
For astrophotography, the favorites are the fork mounted 8” Schmidt
Cassegrain and/or an 8” equatorial mounted Newtonian. Double stars,
planets and the Moon are best viewed with a good refractor for razor sharpness
and higher contrast.
Where do you buy it? The choices are local or mail
order. The best choices and prices will probably be mail order but at this
date you might be too late for Christmas delivery.
How much to Pay for it? This is a very rapidly changing market;
you might want to consult with the stargazer members who keep on top of
such things. Also there are a lot of one time deals out there.
Accessories You’ll probably need eyepieces, and you’ll
want a Telrad (even if you already have a finder scope) and finally be
sure to get a planisphere, especially is you’re a beginner.
From the President’s Desk
Back in 1988, my family and I had the pleasure of meeting Clyde Tombaugh
at Stellafane. At the time it didn’t register that Dr. Tombaugh was
the only living person to discover a planet in our solar system – and probably
the last person to do so. Today, I look back on the occasion as one
of those experiences that one remembers – forever. This past weekend,
I had a similar experience. While visiting my son, Matt, in Lexington,
KY, I had the pleasure of meeting Harrison “Jack” Schmitt. Who is
Jack Schmitt, you ask. Well, he is the only scientist to have visited
the moon. Jack went to the moon on Apollo 17,
December 11, 1972. He is a geologist; he participated in examination
and evaluation of lunar samples after each mission and finally stepped
onto the moon – the last of the 12 astronauts to do so. Dr. Schmitt’s
presentation recounted his trip to the moon and kicked off Earth Week for
the University of Kentucky.
Although I was very much alive in the late 60’s and early 70’s, the
Apollo program was not a high priority item in my day-to-day activities.
Attending and “staying in” college, the Vietnam War, body counts, demonstrations
and riots on our campuses and in our streets, assassinations, and working
for funds to pay for college…all these put the Apollo program
very low on my list of “musts”. Today, I read about the tremendous
efforts of our nation in the space race and wonder how I could have missed
10 years of mankind’s best performance. I also wonder why we
have no program of such importance in progress today – we don’t even talk
about “going forward”. What a rut to be in!
Here are some tidbits of information about Apollo 17 and the race to
the moon I jotted down during Dr. Schmitt’s presentation:
* Gene Cernan wore an extremely loud pair of plaid pants while
driving the Lunar Rover in Arizona – and my wife bought me a pair similar
to them about 1971-72 but I could never get the courage to wear them in
public
* The velocity required for Earth orbit is 18,000 MPH and 25,000 MPH
for a trajectory to the moon – Apollo 17’s trajectory was nearly perfect
and required very few adjustments –the ship was “rolled or spiralled” continuously
to avoid overheating the sunward side
* The lack of color on the moon is due to a lack of water – without
water there is no oxidation of the minerals and thus no rusty reds or corroded
greens…
* The American flag stands out because it had a curtain rod holding
it outstretched
* The backup firing mechanism for the ascent module was a set of jumper
cables – if the ascent rockets failed to fire, the commander would exit
the ascent module, locate the jumper cables in the descent module, connect
them to a battery in the descent module, re-enter the ascent module and
connect the other end of the cables, and push the “start”
button. This procedure was never tested on the moon…
* There were approximately half a million people working for NASA during
the race to the moon – approximately 1/3 government and 2/3’s contractors
* Most of the people (2/3’s-3/4) working for the Apollo program were
less than 30 years old. I hope history remembers this period and
the tremendous effort and courage of those committed people who made the
lunar landings, and returns, one of the crowning events of our existence.
Back to reality – our 8th No-Frills Star Party is history. We
all had a good time and after several days of hot, muggy weather we welcomed
Saturday morning’s clear sky and promise of a great Saturday night.
No one was disappointed with Saturday night! We will dissect this
party and make a few notes for possible improvements for the next one.
Attention: Star gazing at Tuckahoe for November is scheduled
for November 1-2. We have been invited to use the Equestrian Center
grounds.
Here are directions to the Equestrian Center: from the entrance to
the camping area (where we normally stargaze) –
follow Cherry Lane to the stop sign and turn right onto Crouse Mill
Road – go past the lake (on your right) – the road will split just after
passing the lake – take the left fork and look for the entrance to the
Equestrian Center on your right (approximately 200 yards).
We will meet in the field behind the buildings.
The Leonids: we will meet at the ball field for the Leonids
, Monday night, November 18. The moon will not be an asset but this
is supposed to be the last chance of significant showers for several years.
Dance for clear weather…
Our program this month is “Choosing and Using Barlows”. We will
answer questions of what, why, which one, how much, etc – come and learn
all about barlows. Bring your questions and your barlow if you have
one. Lyle will tell us all about Cygnus; we’ll have some facts about
our planet Earth, and some pics of the moon.
Delmarva Star Gazers is sponsoring a mirror making seminar again this
year and we will also construct the prominence scopes during the seminar.
The seminar will be advertised on the internet and other websites early
in December. If any Delmarva Star Gazer wants to participate please
contact Lyle Jones (302-736-9842) ASAP because the spaces do not
last more than a couple of hours after we list the event on the internet.
For information, we have approximately 12-15 mirror making stations and
20 prominence scope positions. The costs are: Mirror making -10”
= $375, 8”= $225, 6” = $175, and prom
scope = $400. All supplies, instructions, meals, and lodging
are included in the fees. Steve Swayze (Swayze Optical) will again
be here to assist in figuring the mirrors. Dave Groski will be the
instructor for assembling the prom scopes. For information,
last year’s seminar was a huge success. Most of the mirrors were
finished to excellent figures and the prominence scopes perform very well.
This is the same design that won an award at Stellafane this year.
Enuf – see you at Tuckahoe or the Church. Don…
The Editor’s Quadrant....
The Leonid Meteor Shower November 18-19
This shower, caused by comet Tempel-Tuttle, will come in 2 waves, the
first from the 1767 dust trail and the second from the 1866 dust trail.
The first will come on November 18 at about 11 p.m. EST; the second
will be about 6 hours later at 5:30 p.m. EST. The morning of Tuesday
the 19th should be the bettert, since its ZHR (zenithal hourly rate)
is 6000 vs. 3000 for the 18th. Also, the full moon of the 18th will
be at its highest whereas the moon of the 19th will be an hour away from
setting. The radiant will be in the center of Leo’s sickle head.
The Planets in November
Mercury is too close to the Sun for decent viewing
for almost all of November. You may catch a fleeting glimpse at the end
of the month when it rises 50 minutes before the Sun.
Venus passes through conjunction with the Sun early in
November and by the middle of the month is rising almost 2 hours before
the Sun and 3 hours by the end of the month, reaching magnitude—4.6.
Mars remains a morning star in November, increasing very
slightly in magnitude.
Jupiter improves throughout November since it rises ever earlier
as the month proceeds, and finally rising slightly before 10:00 p.m.
as the month ends. The size of the planets disc increases 3 arc seconds
to 40.4.
Saturn also does nothing but improve in November as it rises
ever earlier with rings open at full tilt and the magnitude reaches -0.2.
As for the remaining planets in October, Uranus and Neptune
can still be found in Capricornus and
Pluto remains in the southern part of Ophiuchus but near the
end of the month will be too close to the sun for viewing.
Clear Skies! Frank Sheldon f.a.sheldon@att.net
Club Activities...
Club Meetings- We meet in the First Presbyterian Church in Smyrna,
DE (653-8000) on the first Tuesday of each month from 7-9 PM. From
US 13, turn west at Wendy's and go one stoplight on Commerce Street;
the church is on the right directly across from the Fire Hall.
Future Meetings...The remaining meeting dates for 2002
will be: November 05, December 03. The regular meeting
format includes discussion of club activities, observing highlights and
an advertised presentation.
We solicit suggestions for topics and presenters.
Club Observing... Observing is (usually) scheduled for the Friday
nearest the New Moon to maximize the hours of deepnight
without the moon in the sky. Unless otherwise stated,
the monthly observing site will be at the baseball field in the camping
area at Tuckahoe State Park.
The monthly observing days left for the year 2002 will be:
November 1, and December 6. The cloud or rain date for the
monthly Friday observing will be the following Saturday, but don't trust
the weather man! Go outside and look for yourself or check the CNN
weather link on our web page. If you still can't decide,
Call Don Surles (302) 653-9445 or Lyle Jones (302) 736-9842
Delmarva Star Gazers Officers for 2002-2003
President.................Don Surles 302 653 9445
Vice President..........Lyle Jones 302 736 9842
Secretary...........Keith Lohmeyer 410 482 077
Treasurer............Kathy Sheldon 302 422 4695