AstroNotes 1981 July Vol: 20 issue 07

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A S T R O N O T E S
ISSN 0048-8682
The Newsletter Magazine of the Ottawa Centre of the RASC
Vol. 20, No. 7
$5.00 a year
July, 1981
Editor....... R olf Meier....... 4-A Arnold Dr......820-5784
Addresses.... Art Fraser....... 11-860 Cahill Dr.. .225-3082
Circulation.. .Barry Matthews...2237 Iris S t ...... 225-6600
PUBLIC STAR NIGHT AT IRO
Brian Burke
There will be a public star night at the Indian River
Observatory on Friday, July 24, or Saturday, July 25.
If
you need a ride, please let me know so that I can arrange
to have members with cars provide transportation.
If rides
are needed, we will meet at the Carlingwood Shopping Centre
at 20:00.
The public living in the Almonte and Carleton
Place area will be invited to attend the star night. Since
the public is being invited, I urge all members with
telescopes to bring then out to IRO . I hope to see all of
you there, and let's hope the weather does not fool us this
time like it did in May.
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OBSERVER'S GROUP MEETING - JUNE 5
Susan Argue
Rob Dick opened the meeting at 8:20 pm this month in
the absence of Chairman Brian Burke. The Observer's Manual
was presented again for anyone interested.
Robin Mol son ascended first and mentioned that if any
member wanted to get to IRO but couldn't because of
transportation (or lack of it) they should call a
key-
holder.
Also, keep in mind that it would be nice to help
pay for gas.
The cancelled star night turned out to be
clear with great viewing.
Rolf Meier was thanked for
painting the steps at IRO, and it was mentioned that any
help in the care of IRO, for example, cutting the grass,
would be greatly appreciated. He also explained that the
absence of an Ottawa report in the Toronto newsletter was
due to a mixup during position shifting.
The missing
article will be in the next report.
Murray
Kaitting,
the
secretary
of
the
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-Kitchener-Waterloo Centre, was up next to say "Hi" and show
some slides of their three observatories and telescopes.
Paul Mortfield was up next with some slides, a first
attempt as he usually takes black-and-white prints.
They
were of the April 11 aurora, and showed red and green.
Also to be seen, through the aurora, were Jupiter and
Saturn.
He then proceeded to give us a look into
improvised meteor photography.
For regular fish-eye lens
meteor photography, an lens costing hundreds of dollars is
required.
Paul figures why not use something cheaper that
is close at hand, such as large hubcaps (found mainly on
old Volkswagon Beetles).
Another idea, from the vast
depths of the enthralled audience, was security mirrors
that are used in stores.
Next was Mr. Charles Haggar, from the San Francisco
branch of the RASC.
He described some of the programs
offered at the University of San Francisco and had some
slides of telescopes.
He mentioned that Ottawa is making
plans for a planetarium and that we are the last major city
to get one.
The major part of his presentation was a
series of slides on planetariums around the world. As each
slide was presented, he went into a bit of its history.
Ted Bean was up for a short period of time to talk
about pitch lap molds.
Frank Roy was up next with slides taken with normal
and hypersensitized Fujichrme slide film. They included the
Ring Nebula, the Sombrero Galaxy, M 13, and Uranus.
Rob Dick was up to show some slides of sunspots to go
with recordings from Jim Zillinsky's radio telescope.
The
slides were from May 17 and 23.
Last to present was Doug George.
He had a tape
recording of noise that got louder for a short time at one
point, signifying a meteor.
The recording was made while
trying to bounce radio waves off the ionosphere to test a
new modem.
At 8 MHz they went through the ionosphere and
bounced off meteors.
The meeting was closed at 10:07 pm.
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RECENT SOLAR ACTIVITY
Robert Dick
To continue a tradition, I have plotted the activity
of the sun for the last short while.
However, please note
that the scale of the ordinate (y-axis) is logarithmic.
This is to permit all the points to be on the graph.
The
data was recorded and reduced by Jim Zillinsky.
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2
--3-It appears the active hemisphere of March and April
1981 has finally been put to rest (note that the rotation
of the sun's equator is about 27 days) and the activity of
another area is increasing.
If you have any reports of
auroral activity, please call me before the Astronotes
deadline for inclusion in articles on the activity of the
RADIO SOURCES
Frank Roy
In the past year, a lot of work has been done on the
radio telescope.
As a result, we improved the antenna
response and the overall sensitivity of
the system.
Textbook-like fringes have been obtained from Cass A and
Cygnus A, and just recently, Herc A was received.
In the next few pages are some of the best fringes yet
obtained.
Excluded are the sun (it is resolved by our
interferometer) and Taurus A because it is too close to the
sun at this time of year.
All of the fringes are with a time constant of 10
seconds, with a rolloff of 8 dB/octave.
The I.F. has a
bandwidth of 100 kHz (-3dB).
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4
-SO A
L R DISC
Robert Dick
This disc will
your RASC Observer’s
July .
Handbook for the appropriate o f dates.
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10
-astro notes
T O
MS. ROSEMARY FREEMAN
NATIONAL SECRETARY
THE ROYAL ASTRON. SOC.
1 2 4 MERTON STREET
TORONTO, ONTARIO
M4S
CAST
O
F CAN.
2Z2