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A S T R O N O T E S
The Newsletter Magazine of the Ottawa Centre of the RASC
Vol. 24, No. 7
$5.00 a year
Editor.......Rolf Meier..... 4-A Arnold Dr....... 820-5784
Addresses....Art Fraser..... 92 Llllico Dr....... 737-4110
Circulation...Robin MoIson. ..,2029 Garfield Ave.. .225-3082
OBSERVER'S GROUP MEETING - MAY 3
Chairman Doug George opened the meeting at 8:14 pm
with 65 people in attendance, of whom 46 were members. He
announced that the next public star night will be held on
the night of May 24 or 25, at Andrew Haydon Park.
Centre president Brian Burke was up to thank all the
people involved in the Astronomy Day events at the Merivale
Mall and the Museum of Science and Technology. He reminded
the centre that Ken Tapping will be a judge at the
Canada-Wide Science Fair in mid-May.
Mall forms for the
1985 General Assembly in Edmonton were available at the
The main speaker of the evening was Leo Enright of the
He gave a talk on the short history of
the use of photographic films in astrophotography, giving
examples with slides of the moon, the sun, planets, aurora,
and various deep sky objects.
Variable star coordinator Sandy Ferguson encouraged
members to observe the six variables on the list to qualify
for the Variable Star Award given each year at the Annual
Di nner Meeting.
She presented Kyle Nunas who read his
school project about the moon.
Solar coordinator Linda Malar showed 5 slides of the
display at the Merivale Mall on Astronomy Day.
Instrumentation coordinator Max Stuart explained how
specially curved spider vanes supporting the diagonal
mirror of Newtonian telescopes could improve the image of
a bright star by eliminating the diffraction spikes around
Doug George showed slides of Donna Kourtesssis, a
member of the Ottawa Centre, as she displays her project on
-1-communication between computers using lasers at the Science
Next up was Roy Fox, who showed slides of aurora.
Brian and Irmi Underwood gave a slide show using 2
projectors and a tape player controlled by a computer,
Doug George closed the meeting at 10:35 pm.
* * *
OBSERVER'S GROUP MEETING - JUNE 7
Chairman Doug George opened the meeting at 8:15 pm
with 43 people in attendance, of whom 30 were members.
There will be a star night held at IRO on June 14 or 15.
Frank Roy plans to organize a Lyrids meteor session of the
night of June 15/16.
Centre president Brian Burke was up to show slides of
the activities at the Museum of Science and Technology on
telescope, and slides of things he photographed
from his apartment.
Planetary and comet coordinator Rolf Meier explained
what the Earth-Moon system would look like from the planet
Venus. From that distance, the moon would be half a degree
from the earth.
Also, Uranus and Neptune both come to
month. Rolf then showed how
pictures of objects he photographed using a home-made
wooden eyepiece projection system.
Chairman Doug George demonstrated the use of the
computer-controlled Celestron using Sky Sensor 2000.
modified it by
dimming the lights on the keyboard and
quieting the beeper.
The photometer made by various
members for the 16-inch at IRO was displayed.
Variable star coordinator Sandy Ferguson showed a
finder that was made with 50-mm binoculars, eyepiece, and
how he uses
a piece of
transparent plastic with a circle engraved on it over his
star atlas to match his telescope’s field of view.
Instrumentation coordinator Max Stuart displayed his
wooden 6-inch and 13-inch telescopes, and explained how he
plans to construct a Poncet platform for the 13-inch
alt-azimuth mounted telescope to follow the stars.
Doug closed the meeting at 10:15 pm.
VARIABLE STAR AWARD 1985
With summer upon us and the prospect of warm (and
hopefully clear and starry) nights ahead for a while, why
not dust off the binoculars and consider becoming a
participant in the Observer’s Group variable star program?
For beginners, it's a way to get to know the sky; for those
with more experience, it's a chance to discover just how
stars and their behaviour differ; and for the really
advanced, it can lead to a lifetime of contributing to an
extremely valuable branch of astronomy, one in which
professional astronomers cannot always participate.
Being a member of the variable star observers crowd in
the Ottawa Centre has other bonuses too. For instance, you
would be eligible to win the Variable Star Award, presented
each fall at the Annual Dinner Meeting, and have the
opportunity to take home the engraved plaque for a year.
Now that's worth thinking about isn’t it? Your family and
friends would truly be in awe of your achievements!
So, now that I ’ve got your attention, you will no
doubt want to know how to get involved.
Well, the first
thing you should do is get the variable star handbook from
me; I will have copies at the Observer’s Group meetings,
and if you cannot attend, I will be delighted to deliver or
mail a copy to you.
Secondly, you will have to get into
the backyard and start locating the variables on the
You're having trouble tracking them down, you say? No
problem; give me a call and we'll take the time to walk
through them one by one, until you are comfortable finding
them and recording estimates.
Thirdly, you will have to maintain your observing
records end submit them to me, either on a regular basis
over the summer or in total before the Dinner Meeting in
Fourthly, you will have to walk from the dinner table
to the podium to receive the Variable Star Award when it is
presented to you after a summer of hard-won brightness
Now you want to know just what stars are on
the award program this year, and a little bit about each
A bright, easy-to-find variable in the
It is the prototype for the
variables known as Cepheids and has a cycle of 5.37 days
-3-and magnitude difference from 3.6 to 4.4.
Can be observed
naked-eye, but binoculars make magnitude estimates easier.
A bright eclipsing binary in the
constellation Lyra. Another naked-eye star, but binoculars
make estimates easier.
It has a period of 12.93599 days
(approximately?) and ranges from magnitude 3.4 to 4.3.
A semi-regular variable
constellation of Scutum.
Easy to find as it is near the
star cluster M 11. R Scuti is known as an RV Tauri type of
variable (light curves with alternate deep and shallow
minima), and has an average cycle of about 140 days.
The long-period one of the bunch. Chi is
expected to reach maximum brightess in July, so it's an
easy target from the city.
Its magnitude can be anywhere
from 5th to 13th magnitude, but is an easy binocular object
for the brighter part of its cycle.
Another eclipsing binary in
This one is fun because you can watch its
entire eclipse over the course of a few hours.
reason estimates are made every few minutes to get an
accurate light curve for the variable.
from 6.2 to 7.8.
Another semi-regular and a bit of a
challenge object, compared to the others.
can’t all be easy!)
Magnitude ranges from roughly 6.3 to
7.4 with a period of about 100 days.
So there you are.
Now that you have been formally
introduced to the 6 of them, I hope your interest is piqued
in this fascinating branch of astronomy. Please contact me
for any charts or information you need to get started, and
I look forward to receiving your observations throughout
the summer. I can be reached at 829-7514 at home or at any
Observer’s Group meeting.
* * *
Articles for the August issue of Astronotes are due by
* * *
-4-EVENTS FOR JULY
Since w e ’ve been having cloud problems with most of
our events recently, it was decided to hold two this
month. The first is a star night for members and visitors
at the Indian River Observatory. I will be coordinating
rides for those people who do not have transportation
The second event will be a public star night.
The moon and Saturn should be popular sights.
The events are as follows:
July 12 or July 13 - IRO star night
July 26 or 27- PUBLIC star night at Vincent Massey Park
If you need a ride, or have any other questions, don’t
hesitate to call me at 725-0668,
Don’t be shy, I'll be
quite happy to help you!
* * *
SUMMER METEOR SHOWERS
Meteor season is upon us again and this summer should
be a good one,
I will start off with a meteor session at
Quiet Site for the Omicron Draconids on Saturday night,
Moonrise is at 02:30, so it should give us
about 4 hours of observing.
For those of you who are not
familiar with QS, it is our second observing station and is
located near Shirley's Bay on the Ottawa River,
people have a key to this site.
They are David Lauzon,
Sandy Ferguson, Rolf Meier, Robert Dick, and me.
The Perseids are very favourable this year, reaching
maximum just 4 days before new moon.
They are known for
swift and bright meteors and very high hourly rates.
Perseids have a flat maximum, so many meteors may be seen a
week before or after the maximum, which occurs this year on
August 11/12, a Sunday night.
I plan to have meteor
sessions for both Friday and Saturday night at Quiet Site,
and if there is enough enthusiasm, I will have a session on
The Kappa Cygnids reach their maximum on August 18,
with a ZHR of 6, A session is planned for IRO on Saturday
night, August 17/18.
For more detailed information on these and other
showers, consult the Observer's Handbook 1985.
JUNE LYRIDS OBSERVED
The June Lyrids were observed at IRO by Doug George,
Daniel Dlab, and myself on the night of June 15/16.
sky was about 80% cloudy for the entire observing session
of about l hour, and less than a dozen Lyrids were observed
by the 3 of us. Linda Meier reports that she also observed
the Lyrids on June 15/16, but that she saw very few
The latest grazing occultation predictions reveal that
a graze will pass through the centre of Ottawa. The data
for this graze is as follows:
date: Tuesday, July 23
time: 19:47 EDT
star: SAO 139189
limb: north, dark
moon: 39% sunlit
location: Leitrim Road
The limit line for this graze runs north-south through
Ottawa, cutting across the Western Parkway, the Queensway,
Carling Avenue, Heron Road, and Walkely Road.
site appears to be Leitrim Road, just south of Uplands
Note that this is a daytime graze, as the sun
will still be about 7° above the horizon.
We have never
attempted such a graze before.
like all jobs,
this task has
Anyone at a station between the
railroad tracks and High Road, hit the dirt when you hear
someone yelling FORE! because you will be next to a golf
course. If you happen to be west of High Road then keep a
low profile, because you will be in the corridor for
Also, setting up telescopes in daylight
may attract attention, especially from people in blue cars.
We will meet at Billings Bridge Shopping Centre
outside the Mr. Donut at 18:30.
If interested in
participating in this expedition or if you can lend
equipment, please call me at 521-8856 after July 15.
-6-RADIO TELESCOPE BACK ON THE AIR
The Indian River Observatory Radio Interferometer
(IRORI) picked up a textbook fringe from Cygnus A on June
The radio telescope has been undergoing some
changes since the summer of 83.
We changed our operating
frequency last year to 244 MHz with little success. Now we
are back on 238.5 MHz and are picking up some excellent
fringes from Cygnus A, as demonstrated by the fringe on the
The IRORI is a phase-switched interferometer
with two 15-m by 5-m parabolic cylinders separated by 185
metres in the east-west direction.
It is a transit
The interferometer was dedicated in 1978 by Art
Covington and since has undergone may changes.
receiver was completely rebuilt including the front end
So far we successfully picked up 6 or 7 radio
sources, including the sun, Cass A, Cyg A, Tau A, Vir A,
Her A, and Cent A.
The last one is somewhat uncertain
because we have only 1 noisy fringe from this source.
As the telescope undergoes further improvements, we
expect to achieve enough sensitivity to detect several
quasars, and possibly a pulsar.
Since the interferometer
is in a state of flux, it is not ready for use.
hopefully by late this fall our improvements should be
finished and the system will be ready for use by
Projects slated for IRORI this year are:
sky to -45° dec with the possibility of picking up a dozen
or so radio sources; mapping the milky way; and monitoring
the daily solar activity. The use of a programmable timer
permits the user to activate the chart recorder only when
the source is in the beam.
Anyone interested in using the interferometer should
contact me at the Observer's Group meetings.
Many of you will recall the highly-successful Messier
Marathon held a few months ago.
While the marathon is an
excellent way for observers to gain experience in finding
different objects, it is only possible over a short period
of time. It is also difficult for beginners to participate
in the marathon, as it takes an entire night.
-7-CYGNUS A. Recorded with IRORI @238.5MHz with
a time constant of 10 seconds, and chart speed
of 6 in ch es per hour. The antennae are 15x5m
cylinders spaced by 185m in the east-west.reason I am introducing a slower-paced version of the
Messier Marathon, the Messier Race. Here, the objective is
to observe all of the Messier objects over a period of
For the beginner with modest equipment, many of the
Messier objects can be found with binoculars, or even with
the unaided eye. It is possible to find all the objects in
a 6-inch telescope.
It is very important to get away from
the city lights while observing, but you could probably
find quite a few objects from your backyard.
indication is the magnitude of the object,
M 13, for
example, is at about magnitude 6, and is visible to the
naked eye under good conditions.
It can be found with
binoculars under fairly poor conditions.
such as the 1lth-magnitude galaxy M 89, require dark sky
conditions and a modest-sized telescope.
For this purpose, I have created a new version of my
Messior list, which lists all the objects by hours of right
Therefore, all the objects in one area of the
sky are grouped together.
The table includes the same
information as the original one.
The first column gives
the Messier number of the object.
Next, the position in
right ascension and declination is shown.
follows the format of Burnham's Celestial Handbook (a set
of books which I highly recommend.
In this format,
13249sl205 translates to RA 13h 24.9m, dec -12° 05' (epoch
The "s" indicates that the object is south in
declination, resulting in the negative declination.
column of the table give the page number in
Next, map numbers are listed for Wil Tirion's
Sky Atlas 2000.0, Skalnate Pleso Atlas, and Norton's Star
Atlas. Then, the type of object, the constellation where
the object is found, and its magnitude are listed. A brief
description is also included for selected objects.
This table makes it quite easy to locate all of the
If you have a telescope with setting circles,
you can find the position from the table.
recommend that you use a technique called "star hopping",
especially if you are a beginner interested in learning the
constellations, the use of a telescope, and general
The first step is to look up the
desired object on a star atlas.
A good star altlas, such
as the Sky Atlas 2000.0, is essential for star hopping, as
well as observing in general.
It is often difficult for
the beginner to recognize the constellations on such an
atlas, because the outlines of the figures they represent
-9-are not shown. To help you recognize the constellations on
the map and in the sky, you can look at simpler charts,
such as the ones in the hack of the Observer's Handbook.
The map number columns in the table will help you find
the desired object in the star atlas.
If you have trouble
finding the object quickly on the map, then a glance at the
RA and Dec will lead you directly to the object. Comparing
the map and the sky, you can determine the approximate
position of the object on the sky. Now, you can locate the
in the telescope by star-hopping.
technique, you start at a bright star near the object that
you can locate easily, and move to fainter stars until you
find the correct field,
A column is provided in the table
to check off each object that you find, to keep a record of
If you are just starting, and want to find some easier
objects, I would recommend M 44 and M 45 (naked eye or
M 13, M 31, and M 42 (binoculars
telescope); and M 2, M 8, M 17, M 27, M 57, M 81, and M 82
Of course, there are many other bright
binoculars. You can probably find most, if not all of the
star clusters using a small instrument.
As a guide to planning your observations, the RA hour
directly overhead at about 8:30 pm for all months is shown
below. You should be able to see objects within at least 4
hours on either side of this hour angle. Since the objects
are listed by RA hour in the table, this should help you
determine which objects are above the horizon at any time.
If you have any questions, or would like some help in
actual observing, feel free to call me any evening:
LISTED BY HOURS OF RIGHT ASCENSION
Norton Typ Con Mag 2
10 03439s2358 1863 4 2 5,6 Cl Tau 79
9 Fine Spiral
Irregular near 81
M RA and DEC Burn 31
companion to above
pair with 96
pair with 95
pair with 66
pair with 65INDEX TO ASTRONOTES VOLUME 23 (1984)
COMETS, ASTEROIDS, NOVAE
P/CROMMELIN-A DUD; DAVE FEDOSIEWICH; MARCH; 14
LEARN MORE ABOUT COMETS; DAVE FEDOSIEWICH; MARCH; 14
OCCULATION OF SAO 158913 BY SATURN-MARCH 23; ROLF MEIER; MARCH; 17
LEARN MORE ABOUT COMETS HERE; DAVE FEDOSIEWICH; MAY; 7
NEW COMET MEIER-1984o; OCTOBER; 6
NEW COMET LEVY-REDENKO 1984t; ROLF MEIER; DECEMBER; 4
ON ASTRONOTES; SEPTEMBER; 1
CORRECTION; DAVID LAUZON; MAY; 3
ILLUSTRATIONS AND PHOTOS
LIGHT CURVE , DELTA CEPHEI; MARCH; 8
FINDER CHART , T MONOCEROTIS , RX LEPORIS; MARCH; 10
SOLAR EXPLORING; APRIL; 4
MAP OF MAY 1984 ANNULAR ECLIPSE; MAY; 4
ECLIPSE TYPES; MAY; 6
FINDER CHART, g HERCULIS AND X HERCULIS; MAY; 12
MAY GRAZE; JUNE; 5
FINDER CHART, CHI CYGNI; JUNE; 7
FINDER CHART, BETA LYRAE; JUNE; 8
MARS DRAWINGS; JUNE; 10
SIDEREAL CLOCK SCHEMATIC; SEPTEMBER; 8-9-10
FINDER CHART, R SCUTI; SEPTEMBER; 12
FINDER CHART, RZ CAS; SEPTEMBER; 13
IRO MAP; NOVEMBER; 7
DOMINION OBSERVATORY OTTAWA; NOVEMBER; 8
PHOTO M100; DECEMBER; 5
PHOTO M 31; DECEMBER; 6
GENARATING SIDEREAL TIME; FRANK ROY; SEPTEMBER; 7
MEETINGS, CONVENTIONS, STAR NIGHTS
DINNER MEETING-NOVEMBER 25; JANUARY; 1
COUNCIL MEETING-JANUARY 25; ROB McCALLUM; MARCH; 2
COORDINATORS MEETING-FEBRUARY 3; GARY SUSICK; MARCH; 2
TELESCOPE WORKSHOP; MALCOLM LAMBOURNE; MARCH; 5
DR. VARSHNI ON QUASARS; APRIL; 1
ASTRONOMY DAY AT ST-LAURENT SHOPPING CENTRE; LINDA WARREN; JUNE; 2
INTERNATIONAL ASTRONOMY DAY; GARY SUSICK; JUNE; 3
- 11a -THE 50TH ANNUAL STELLAFANE MEETING; LINDA MEIER; SEPTEMBER; 4
THE 1984 GENERAL ASSEMBLY CONVENTION; LOUIS KRUSHNISKY; SEPTEMBER; 5
DEEP SKY WEEKEND THIS MONTH; SEPTEMBER; 14
CENTRE MEETING-SEPTEMBER 18; MALCOLM LAMBOURNE; OCTOBER; 2
COUNCIL MEETING-SEPTEMBER 12; MALCOLM LAMBOURNE; OCTOBER; 4
ANNUAL DINNER MEETING; OCTOBER; 5
11TH ANNUAL DEEP SKY WEEKEND; OCTOBER ; 5
AAVSO FALL MEETING; OCTOBER; 6
NEW MEMBERS NIGHT; MALCOLM LAMBOURNE; NOVEMBER; 6
DINNER MEETING; NOVEMBER; 9
OBSERVER'S GROUP MEETING-DECEMBER 2 1983; DAVID LAUZON; JANUARY; 2
OBSERVER'S GROUP MEETING-JANUARY 6 1984; DAVID LAUZON; FEBUARY; 1
OBSERVER'S GROUP MEETING-FEBUARY 3 1984; DAVID FEDOSIEWICH; MARCH; 1
OBSERVER'S GROUP MEETING-APRIL 6 1984; DAVID LAUZON; MAY; 1
OBSERVER'S GROUP MEETING-MAY 4 1984; DAVID LAUZON; JUNE; 1
OBSERVER'S GROUP MEETING-AUGUST 3 1984; DAVID LAUZON; SEPTEMBER; 2
OBSERVER'S GROUP MEETING-JUNE 1 1984; DAVID LAUZON; SEPTEMBER; 2
OBSERVER'S GROUP MEETING-SEPTEMBER 7 1984; DAVID LAUZON; OCTOBER; 1
OBSERVER'S GROUP MEETING-OCTOBER 5 1984; DAVID LAUZON; NOVEMBER; 1
OBSERVER'S GROUP MEETING-NOVEMBER 2 1984; LOUIS KRUSHNISKY; DECEMBER; 1
METEORS AND AURORA
QUIET SITE; JANUARY; 6
THE GIMINIDS OF 1983 AND BEYOND; DAVID LAUZON; FEBUARY; 3
THE 1984 QUADRANTIDS; LINDA WARREN; MARCH; 12
SPRING METEORS-THE APRIL LYRIDS; DAVID LAUZON; APRIL; 9
METEOR SIGHTED DURING SEPTEMBER MEETING; THOMAS WRAY; NOVEMBER; 5
ASTRONOMICAL TRIVIA; JANUARY; 4
THE MINI MAGELLANIC CLOUD; FEBRUARY; 2
IRAS NO LONGER ALIVE; FEBRUARY; 4
ATRONOMICAL TRIVIA; FEBRUARY; 9
ASSORTED BUSINESS; ROB McCALLUM; MARCH; 5
ASTRONOMICAL TRIVIA; MARCH; 18
HOW OLD IS THIS ROCK CALLED EARTH; DAVID LAUZON; APRIL; 5
BOK AWARDS IN ASTRONOMY FOR H.S. STUDENTS; PAUL FELDMAN; APRIL; 7
ASTRONOMICAL TRIVIA; APRIL; 10
ASTRONOMICAL TRIVIA; MAY; 3
FOR SALE; NOVEMBER; 9
AWARDS; NOVEMBER; 9
ASTROWORD; NOVEMBER; 10
A MARCH GRAZE; BRIAN BURKE; MARCH; 6
TWO MORE GRAZES; BRIAN BURKE; APRIL; 8
MARS COMES TO OPPOSITION; ROLF MEIER; MAY; 13
THE MAY GRAZE; BRIAN BURKE; JUNE; 4
OBSERVATIONS OF MARS; JUNE; 10
- 11b-RADIO ASTRONOMY UPDATE; FRANK ROY; NOVEMBER; 6
REPORTS, LETTERS, COMMENTS
CHAIRMAN'S PREVIEW OF 1984; GARY SUSICK; JANUARY; 1
THE 1984 OBSERVER'S GROUP COORDINATORS; GARY SUSICK; JANUARY; 3
LETTERS TO THE EDITOR; FEBRUARY; 4
CHAIRMAN'S REVIEW-1983; ROLF MEIER; FEBRUARY; 9
NOTICE (DEAR OBSERVER); MAY; 14
LETTERS; RUTH HICKS; NOVEMBER; 3
A VISIT TO THE MONTREAL CENTRE OF THE RASC; SANDY FERGUSON; NOVEMBER; 3
PHOTOGRAPHS IN ASTRONOTES; DECEMBER; 4
ARTICLES IN ASTRONOTES; 4
SOLAR ACTIVITY; LINDA WARREN; JANUARY; 3
SOLAR EXPLORING; LINDA WARREN; APRIL; 2
ANNULAR ECLIPSE OF THE SUN; LINDA WARREN; MAY; 4
TABLES AND LISTS
LIST OF KEYHOLDERS 1984; SEPTEMBER; 14
VARIABLE STARS OF THE MONTH; SANDY THUESEN; FEBRUARY; 5
EPSILON AURIGAE; SANDY THUESEN; FEBRUARY; 7
TYPES OF VARIABLE STARS; SANDY THUESEN; MARCH; 6
VARIABLE STAR OF THE MONTH-RT AURIGAE AND T MONOCEROTIS; SANDY THUESEN; MARCH; 9
SEMI-REGULAR VARIABLES; SANDY THUESEN; MAY; 10
VARIABLE STARS OF THE MONTH-(30) HERCULIS AND X HERCULIS; SANDY THUESEN; MAY; 11
VARIABLE STARS OF THE MONTH; SANDY THUESEN; JUNE; 6
R CORONAE BOREALIS; SANDY THUESEN; JUNE; 8
VARIABLE STAR AWARD-1984; SANDY THUESEN; JUNE; 9
VARIABLE STARS OF THE MONTH-R SCT , RZ CAS; SANDY THUESEN; SEPTEMBER; 11
VARIABLE STAR WRAP-UP; SANDY FERGUSON; DECEMBER; 3
- 11c-OBSERVING NOTES
- 11d -M RA and DEC Burn Tir SP Norton Typ Con Mag 106
7 WHIRLPOOL GALAXY
101 14014n5435 2000 2 4 11,12 Sp UMa 8 large spiral
5 15160n0216 1776 15 9 11,12 Gb Ser 6 80
9 6 17368s3211
TRIFIDM RA and DEC Burn T ir SP Norton
39 30 21276nll57
21375s2325 52 23220n6120
Typ Con Mag
520 3 5 1,2 Cl Cas 8
........ K E Y ........
Open Star Cluster
OMEGA or SWAN
bright globularSOME (MORE) HIGH PROPER MOTION STARS
In the June issue of Astronotes I presented 4 stars
which are part of the IRO Proper Motion Survey,
survey is to encourage members in the OG to participate in
a scientific project using the 40-cm telescope at IRO. The
goal of the project is to photograph certain high proper
motion stars at the prime focus of the telescope. I have
chosen the 100 fastest moving
stars north of declination
-40° as listed in the Luyten catalog of high proper motion
stars (LHS Catalog 1979).
The photographs will be 10-minute exposures on a high
speed film such as Fujichrome 400D , Tri-X, Kodak 2415, or
Agfa 200RS. This will give a limiting magnitude for stars
of about 17. The 40-cm is an f/5 with a focal length of
2000 mm, giving it an image scale at the prime focus of
105" per mm.
A standard 35-mm slide or negative measures
24 x 36 mm, resulting in a field of 42' x 63'.
The equipment for doing astrophotography is available
All that is required from you is the "T" adapter
for your particular 35-mm camera.
If anyone is interested
in participating in this project I would like to hear from
The magnitudes are photographic.
Most of the stars
are quite red so the visual magnitude is about 1 or 2 mags
The PA (position angle) of the motion is the
usual notation, from the north point through the east, from
0 to 360 degrees.
Mu is the annual proper motion in
seconds of arc per year.
RA 8h 09m 12s, Dec +8° 59.6' (1950.0)
8h 11m 58s
+8° 46.3' (2000.0)
mu: 5.211" per year
LHS 35, G050-022, LFT 569, Ci20-462,
GL 299, LTT 18039
61 Cygni A, B
A very famous double star.
In 1792, Piazzi detectedan annual proper motion of 5.22" per year.
61 Cygni A has
a visual magnitude of 5.3 and a calculated distance of 11.1
RA 21h 04m 39s, Dec +38° 30.2' (1950.0)
21h 06m 54s
+38° 45.0' (2000.0)
mu: 5.204" per year
theta: 52.2 degrees
11.1 light years
GL 819, SAO 70919, ADS 14636
Lalande 21185 is the 4th nearest star known.
an apparent visual magnitude of 7.6 and is a red dwarf.
RA llh 00m 37s, Dec +36° 18.3' (1950.0)
llh 03m 20s
+35° 58.2' (2000.0)
M r : 7.3
mu: 4.778" per year
theta: 186.8 degrees
constellation: Ursa Major
distance: 8.15 light years
other designations: LHS 37, BD+36 2147, LFT 756, GC 15183,
Ci20-604, GL 411, G119-052, HD 95735, SAO 62377
Famous star discovered by professor Max Wolf, and the
3rd nearest star known.
It has an apparent visual
magnitude of 13.66.
RA 10h 54m 06s, Dec +07° 19.1' (1950.0)
10h 56m 29s
+07° 00.7' (2000.0)
theta: 234.6 degrees
-15-other designations: LFT 750, G045-020, Ci20-600, GL 406
Burnham's Celestial Handbook, Robert Burnham Jr; 1978; 61
768-771; Lalande 21185:
1980-1982; Wolf 359:
LHS Atlas, Willem J . Luyten and Henry Albers; 1979
LHS Catalog (second edition), Willem J Luyten; 1979
Proper Motion Survey, The G Numbered Stars,
H.L. Giclas, R . Burnham Jr., and N.G. Thomas; 1971
Gliese Catalog of Nearby Stars (Edition 1969), W. Gliese;
Sky Catalog 2000.0, Volume 1, Alan Hirshfeld and Roger W.
Special thanks to Paul Feldman of HIA for providing me
the catalogs of high proper motion stars and nearby stars,
and to Roy Fox for the enlargements.
FIELD OF LALANDE 21185. Grid squares are 1 on a side with
north at the top; stars to about 11th magnitude are shown.
- 16-ROSS 619. Identification field from a red
plate of the National Geographic Palomar
Sky Survey (48" Schmidt). The chart is 11
minutes on a side, with north up, and
east to the left with the LHS number in
the lower left corner.
-I7 -WOLF 359. Identification field for the famous red dwarf,
from a Lowell Observatory 13-inch telescope plate. Circle
diameter = 1°, north at the top, limiting magnitude 15.61 CYGNI. The noted binary is shown here in 1916 and 1948;
illustrating the proper motion over an interval of 32 years.
19IRO PROPER MOTION SURVEY
Ophi 10.310 355.8
UMaj 7.042 145.5
PscA 6.907 78.9
Scul 6.108 112.5
Cygn 5.211 167.1 MAG RA
h m s
14.3 081158 +0441.8
Ross 619 57
35 61 Cygni A
Lalande 21258 A
( WX UMaj ) 62
Omicron 2 Eri A
Mu Cassiopeiae 23
Cordoba 29191 33
Ross 578 9
Van Maanen°s Star 7
BD+ 2: 348
LP 701- 29
45The Horsehead Nebula, as photographed with the 16"
telescope at IPO. I used Tri-X film with a 30 min.
exposure. Thanks to Roy Fox for making the half
- 21 -STELLAFANE
Stellafane is the name of the annual telescope maker's
convention which is held each year on Breezy Hill, near the
town of Springfield, Vermont.
Many members of the Ottawa
Centre go to Stellafane every year.
It is about a 6-hour
drive from Ottawa. The convention is being held on August
17 this year, although there are activities on Friday,
August 16 as well.
This year it is the "real" 50th
Stellafane convention. Many people camp there, although if
you don't have your camping permit by now it is probably
too late. There are, however, many other campsites in the
area, and also motels.
If you have built a good telescope
recently, you should enter it. Many Ottawa Centre members
have won prizes for their telescopes. This year, Halley's
Comet will be the subject of a number of "tent talks", also
held on Saturday.
Other features of Stellafane include
twilight talks, a swap table, and evening observing and
(The mechanical judging is done during
If you go to Stellafane for the first time
this year, be prepared for the small size of the convention
site; it is even smaller than it appears on pictures. And
it is not the large camping/parking area that you first see
when you arrive. It is a short walk through the trees, and
up the hill.
THE ROYAL ASTRONOMICAL SOCIETY OF CANADA
OFFICERS AND COUNCIL, 1985
TELEPHONE NO.* POSITION: NAME
President: Dr. Jack Locke
523-0182 Treasurer: Mrs. Linda Meier
President: Mr. Brian Burke
President: Mr. Robert McCallum
President: Mr. Rolf Meier
Librarian: Mr. Stan Mott
Recorder: Ms. Sandy Ferguson
Councillors: Mr. Art Fraser
Mr. Michael Harrison
Past President: Mr. Peter MacKinnon
Mr. Malcolm Lambourne
Past Presidents: Mr. Ken Tapping
Mr. Frank Roy
M r . Romeo Wlochowicz
Secretary: Mr. Robin Molson
* H o m e
te le p h o n e
Dr. Gary Susick
Group Chairman: Mr. Doug George
n u m b e r s u n le s s o th e r w is e
in d ic a te d .ASTRO NOTES
c/o H e r z b e r g I n s t i t u t e of A s t r o p h y s i c s
National Research Council of Canada
1 0 0 Sussex Drive
O t t a wa Canada
K 1 A 0 R6
NATIONAL SECRATARY RASC
136 DUPONT ST. TORONTO ONT. M5B 1V2