Sumner sequence charts
|Volume 32, Number 12
Star Observers website at home.earthlink.net/~joevp/index.html
The sequences used on these charts are the result of a professional/amateur
collaboration between Dr. Arne Henden and Bruce Sumner. Arne has been responsible
for obtaining the raw photometry and Bruce has created sequences suitable
for visual and photometric observers.
Arne is a professional astronomer working at the US Naval Observatory Field
Station in Flagstaff, Arizona. Throughout a diverse career he has maintained
his involvement in high precision photometry, and is now one of the worlds
leading authorities (probably the leading authority) in this field. He is
currently working on his second book on astronomical photometry.
Bruce apparently likes to look at the sky. By day, he is a meteorologist in
Melbourne, Australia. At night, astronomy is his passion. He made his first
variable star observation in 1967 and CV's quickly became his favorite targets.
Although not currently actively observing, Bruce sustains his CV interests
with chart making, identifications and sequences. He is a co-author of the
latest series of charts issued by the VSS, RASNZ.
It is our intention to update this chart page with many more charts based
on the Henden/Sumner sequences. Most of these stars do not currently have
corresponding AAVSO charts. Any chart sequence included here that does have
an equivalent 'Standard AAVSO chart' sequence should be used with extreme
caution. HQ does not like to mix sequences, and wants observers to use the
AAVSO chart sequences even if they have errors or are incomplete. For preliminary
chart fields, the situation is less certain (ask HQ). For fields that the
AAVSO has not yet generated charts, the Henden/Sumner sequences should be
There are two sets of charts. "South Up" charts are for use with
telescopes that show the standard astronomical orientation, south at the top
and east to the right. "Reversed" charts are for use with telescopes
that show a mirror-reversed image, north at the top and east to the right.
The charts are drawn over scanned images of POSS plates that have been digitally
oriented, enhanced and made to appear as negatives (black stars on white background).
The field size is 14.1'.
holes in the clouds allowed observing every now and then. The nine day old
Moon made some interesting appearances for the public. It finally succumbed
to some rain around 10:00 PM, just about the time when the raffle started
and all attendees gathered under the protection of the roof in the vending
machine area. I didn't get a chance to see all the lectures presented that
evening but I was pleasantly surprised at Barry Craig's comet building presentation
and how it kept the attention of the many youngsters who came out to see it.
Considering the weather, the star party was certainly a success in my book.
If four hundred can be attracted even in sloppy elements, fair weather attendance
would have been fabulous, to say the least. No one had to worry about remote
parking and shuttle buses this time...but next year?
Telescope makers, please stand at attention. The pages of Sky And Telescope
(November, 2000, Pages 131 thru 140) have revealed something about mirror
making that could revolutionize the amateur side of telescope making. It's
an article by Alan Adler, that quite literally explains how to build a special
mirror cell that will change the shape of a spherical mirror into a paraboloid,
that could reach a wavefront error of 1/20 wave and better, depending on the
type of material that is used to construct the cell. Basically it envolves
pulling on the center of the mirror, from behind, with a threaded screw assembly,
increasing tension on the mirror. That changes the sphereoid depth to a paraboloid.
The adjustment is made while examining a star image, thereby producing an
image based on the observer's definition of quality. The explanation I've
given is over simplified, of course, but the possibilities of creating a revolution
in telescopes becomes apparent. Manufacturers of telescopes and mirrors would
only be required to produce sphereoids instead of parabaloids, much easier
to accomplish and would gaurantee lowering the cost of telescope mirrors.
The mirror cells that come with the telescope would be of the Adler design,
allowing the user to create his own quality mirror. Amazingly, the process
works better on thin mirrors because less tension is required to produce the
correct parabaloid depth. However, it is more difficult to accomplish on mirrors
larger than 12.5 inches in diameter because of the requirements to keep the
mirror from bending more in one direction, causing astigmatism. Mr. Adler
claims that the figure of the mirror, once adjusted, will remain defraction
limited for periods of up to a month at a time. How quickly the mirror begins
to deform back to a sphere depends on how well the cell is constructed. The
possibilities are quite thought provoking. Mr Adler's computer program, which
helps design the required mirror cell, is available from the computer group
Thanks to Bob Watt and Cleveland Woodworking, Bob has turned his telescope
making classes into some revenue for the WAS. Along with helping to build
more than forty telescopes for UAW members, he has sold over $90 in WAS shareware
to those new telescope owners. Bob is presently running four different classes
and hopes to add twenty-nine telescopes to the total amount he now has to
Looks like today's theories of how planets develop, need quite a bit of modification
now that eight proto-planets have been discovered in the constellation of
Orion. The not-yet planets don't have anything to orbit around. They're moving
aimlessly through space, as a group, and defy all present day explanations.
All the objects are gasseous and still contracting.
At about 7:52pm, on Saturday, Oct. 21, I was able to catch both the ISS and
the Space Shuttle crossing the northern sky, about fifteen degrees above the
horizon. The shuttle had already separated from the ISS, and had pulled in
front of it by about twenty degrees. That means the shuttle had dipped into
a lower orbit in order to increase its speed.
Gary Ross, of The Grand Rapids Amatuer Astronomical Asscociation, Michigan's
second most prolific variable star gazer (guess who's first), came to visit
the computer group on 10-26. After discussing the various problems involved
with living with a double domed observatory and a research grade sixteen inch
Meade telescope, the Gathen library made quite an impression on him. He was
soon lost in the astronomical section, copying notes of past astronomical
obsevations. Ross is a long past member of the DAS. He recalled giving lectures
to the Warren club in the early sixties.
Kogayaki III. Does the name sound familiar to you? I downloaded a shareware
copy of the program and found it to be another planetarium program. However,
this one is unique, in that it contains no help file or status bar to click
on. Why? Because it's so easy to operate. In some respects it's similar to
Redshift or Distant Suns but without the numerous side icons. It's actually
fun to operate! There is one problem though. The shareware version keeps popping
up a little window to register your name, every 10 seconds When it does, all
functions cease until you tell the window to go away. You have to learn to
use the program in ten second bytes, unless, you buy the registered version
for twenty-five dollars, which, of course, doesn't have the problem.
December marks the end of the ninth year I've been writing these chatter articles.
Time really flies when you're having fun. I hope I've given all of you something
to enjoy or absorb while you've recieved this newsletter. I'm looking forward
to the tenth year.
I would like to apologize to the readers of the printed edition of the WASP.
For some reason, some of my articles have been printed without any paragraphs.
That's happened three times during the last year. They look like one big column
all jumbled up with many subjects. I assure you that that's not the way I
write my column. Hopefully, the problem will be solved so that I'm presented
with a little more respect than that and you'll be able to read my column
a little easier.
The computer meeting date for November will be one day earlier, on Wednesday,
the 22nd, at Gary Gathen's home. The December meeting, on the 28th, will also
be at Gary Gathen's home in Pleasant Ridge, MI. He's located at 21 Elm Park,
three blocks south of I-696 and about half a block west of Woodward Ave.
This column is for those who are interested in buying, trading or selling
items. Call 810-776-9720 (email@example.com
if you want to put an item for sale or trade in this section of the WASP.
The ad will run for six months. The month and year the ad will be removed,
is also shown.
- FOR SALE. Mirror grinding machine. Double spindle Elgin type. $350.
- WANTED. Pentium laptop computer with floppy and CD-ROM drives. 810-776-9720.(3-01).
- FOR SALE. CD Rom drive, 2X, brand new in original package. Includes
audio cable. $15. 810-757-4741. (1-01).
- FOR SALE. 14,400 baud, external, modem by Practical Periphirals. RS232
cable and AC power supply included. $15.00 810-776-9720. (1-01).
or "Annular" eclipse almost half of the Sun's diameter could become
blocked by the Moon. This event will last for just over three hours. First
Contact for the Detroit area will be at 10:52 am. EST with the maximum eclipse
to be at 12.27 pm. EST and last contact to arrive at 2:03 pm. EST.
Anyone wishing to view the eclipse should use a small telescope with the proper
solar filters. Or for naked eye viewing a pair of "Eclipse/Solar Shade"
sun glasses can be worn. The WAS still has about 25 pair of these eclipse
glasses for sale. They are selling for $3.00 each and can be purchased at
the Macomb Meetings or by sending a check payable to the Warren Astronomical
Society to my home address.
For more detailed information about the eclipse visit www.skypub.com or see
the December Sky & Telescope Magazine. WAS members can purchase Sky &
Telescope and/or Astronomy magazines through the club at discount prices.
Sky & Telescope is $29.95 per year and Astronomy magazine is $29.00 per
Business Meeting Minutes
Mike reiterated the procedure for accessing the observatory and utilizing
the telescopes. Joe Van Poucker gave the treasury report indicating funds
of $3362 in the bank.
Blaine announced a halt to meetings and efforts to design and build a shelter
at Stargate for the club's 22" telescope. A lack of interest was cited
as the main reason for Blaine's action. Perhaps another day this much needed
project can be accomplished.
The evening's main event ensued with the election of officers for 2001. Mike
Simonsen will be the club's new president for next year. Marty Kunz will remain
first vice president and Steve Green will take over the second vice president
spot. Our new treasurer will be Mark Femminineo. There were no nominations
for secretary and the position will go vacant unless someone decides to volunteer.
Congratulations to the new officers and a thank you to the departing. And
lest once again we forget, thank you to Louis Namee, the club's devoted keeper
of the library for many years. Lou will continue in that position.
Many members gave announcements ranging from space station sightings, variable
star sub-group observations, satellite observing data web site, next computer
meeting, events at Northern Cross and the next Boon star party. Rick Gossett
gave an invitation to join him in the formation of a new sub-group, solar
system observing.and study. With the addition of the recently discovered 10'th
planet, the group will have its work cut out for them.
Fred Judd announced the addition to the club of a very special new member,
his and Jamie's newborn son. Welcome!
- New Member for October 2000: Don Plonka; Utica, MI
- W.A.S. Anniversaries for December 2000:
- 8 Years: Marilyn Kroth-Baca; Clinton Twp., MI
- 5 Years: Lou Faix; Washington, MI
- 2 Years: Paul & Lisa Zook & Family; Shelby Twp., MI
- 1 Year: Tim Davis; Franklin, MI
- 1 Year: David Granzine; Sterling Heights, MI
- 1 Year: Mark Rupersburg; Grosse Pte. Woods, MI
- 1 Year: Raymond Schautt; Warren, MI