Amateur Astronomers Association of
Princeton
Washington Crossing Observatory Guide
first draft 1/2000 K.
Alexander, revised 7/2000 W. J. Murray, revised 1/2001 R.A. Parker
Keyholder Duties
Along with the privilege of having
full access to the AAAP’s telescopes and observatory facilities, all keyholders must participate in the AAAP’s
public observing programs as outlined below, and are expected to contribute to
occasional maintenance and work sessions at the observatory.
Each keyholder will be assigned to
a public observing duty team of approximately four keyholders. Each team will
have one team leader. The leader and his/her team will have full responsibility
for operation of the observatory and for public interactions during the public
observing sessions. Each team will pull duty on a rotating schedule of the
designated public observing nights. The current public night schedule consists
of the first and last Friday nights of each month from March to November, plus
each Friday night in May and October. The latter are joint AAAP-New Jersey
State Planetarium observing sessions with relatively large groups. The schedule
is published in the SIDEREAL TIMES and on the club’s website
(princetonastronomy.org).
·
The observatory will be open each scheduled public
night when there is a reasonable chance for clear or even partly clear skies.
When conditions are uncertain, phone your team leader regarding status.
·
If you cannot make a scheduled public night, it is
your responsibility to contact your team leader in advance if possible, or the
observatory chairman if the former cannot be reached. You must arrange for your
own substitute if one is needed.
KEYHOLDER PUBLIC NIGHT DUTY IS MANDATORY. IT IS THE RESPONSIBILITY OF EACH KEYHOLDER
TO KNOW THE DUTY SCHEDULE AND HIS/HER DUTY NIGHTS. Persistent absenceS from
duty nights WILL RESULT IN LOSS OF KEYHOLDER PRIVILEGES.
Dealing with the Public
Keyholders are ambassadors of the
AAAP to the public. Patience must be exercised and respect shown when
responding to the various questions and situations that arise when public is on
the premises. Be prepared to direct the flow of people through the observatory
and the grounds when there are large groups. Be aware of traffic and the status
of parking to maintain good control.
Keyholders are expected to be
knowledgeable about astronomy and our equipment, and to be able to communicate
basic astronomical and telescope principles to the public. Use the opportunity
to educate and entertain as appropriate for the audience. Communicate the need
for control of light pollution, for example, point out that homeowners can
minimize outdoor lighting.
It is suggested that the observing
team agree in advance on a list of desirable objects to show the public (refer
elsewhere for suggested talking points for topics to raise). These should
include a mix of the best Messiers plus planets and moon as appropriate. Since
many people stay for only a brief period, it is advisable to rotate through a
list of prime objects a few times during a night’s session.
If non-members arrive at the
observatory on non-public nights, keyholders should briefly describe the
observatory and point out the public observing schedule. Always be polite in
turning away visitors. It is your option to provide a few observations to
public under these circumstances.
Gate Opening Procedure
There are three locked gates
between RT 579 (Bear Tavern Rd) and the observatory in Washington Crossing
Park. Recent security problems in the park dictate that the following
procedures be followed at all times by all keyholders. FAILURE TO FOLLOW THESE PROCEDURES WILL RESULT IN LOSS OF KEYHOLDER
PRIVILEGES.
Each gate is secured in an
identical fashion: a length of chain is
run through the gate latch with the park’s lock on one end and the AAAP’s lock
on the other end. When securing a gate it is to be locked only in this way. DO
NOT ATTEMPT TO LOCK ANY GATE BY ATTACHING THE AAAP’S LOCK DIRECTLY TO THE GATE
LATCH—THIS IS NOT ACCEPTABLE TO THE STATE PARK RANGERS
If a keyholder enters the park to
use the observatory on any night other than a designated public night all three
gates are to be secured upon entering the park and after leaving the park. The gates must not be left open. It is
also not sufficient to close the gate but leave the lock on the chain unlocked
or locked with one number shifted for easy egress from the park after an
observing session is finished. The gate must be locked and the numbers spun on
the lock so that anyone who comes by cannot easily guess the combination and
gain access to the park. This procedure must be applied to all three gates. It
is not sufficient to lock the RT 579 gate but leave the other two open, all
gates must be locked.
The only deviation from the above
procedure is if there are campers in the park, especially in campsite D near
the last gate. The campers need access to the park and therefore the first two
gates must be left open. However, the last gate must always be secured on a
non-public night. It is the duty of the first keyholder to enter the observatory
on a given night to note the state of the gates and communicate this
information to any other keyholders who arrive at the park later. If you plan
to stay at the observatory later than the keyholder who first opened the
observatory, make sure that you find out the status of the gates before he/she
leaves.
On designated public nights all
three gates may be left open to facilitate entry of the public to the park. However, all gates must be locked and secured
no later than 11:30 PM. This means that if there are still members of
the public present at the observatory who do not wish to leave by 11:30 PM they
will be locked in the park until a keyholder leaves and secures the gate(s)
behind him/her. At 11:30 PM a keyholder must leave the observatory to secure
and lock all three gates. (If there are
campers in the park only the last gate needs to be locked and secured.)
If during entry you are stopped by
a park ranger or (on non-public nights, particularly off-season) by township or
State police, identify yourself as a member of the AAAP and assure the police
that you have authority from the Washington Crossing State Park to be on the
premises. Always be polite if you are stopped.
We realize that the above
procedures will be an inconvenience to many keyholders, but they must be
followed if we are to maintain the good will of the park administration.
Parking at the Observatory
On nights other than public
observing nights, keyholders are free to drive back to the observatory on the
gravel driveway and park there. The unlocked gate at the entrance to the gravel
driveway will normally be closed to prevent the public from driving back to the
observatory. It should be closed when a keyholder is leaving the park after
finishing an observing session.
On public nights, the gravel
driveway is reserved for off-loading equipment by AAAP members. If there are
only a few such members they are free to park near the observatory. However, if
a large number of AAAP members bring scopes then the on-duty keyholders should
restrict driveway parking, allowing people to drive back to unload and pack up
equipment only.
Parking on other park roads is restricted to parking
along the side of the road in front of the observatory, but not on the gravel
shoulder or on any grassy area. This restriction applies to all AAAP members as
well as the public. People parking on park roads should attempt to park as far
over on the side of the road as they can without parking on the shoulder in
order to not block road access.
When large groups of people are
expected at the observatory, such as on planetarium nights, the public should
be directed to park in the grassy field near the last gate and walk over to the
observatory. These situations should be planned in advance by the duty team
along with the leaders of the public groups (teachers, planetarium staff, etc).
Opening the Observatory
- Unlock
the door by unlocking both the key lock and the combination lock.
- Turn
on the lights (switch located on your left as you enter the observatory ).
- Disable the alarm.
- Make
an entry in the observatory log. (The log is located on the top of the
yellow desk near the main observatory light. ) LOG ENTRY IS MANDATORY FOR THE FIRST KEYHOLDER TO ENTER AND
THE LAST TO LEAVE THE OBSERVATORY EACH NIGHT OR DAY. The minimum log entry
includes date, time and the keyholder’s name. At this time look around the
observatory to see if anything is amiss (lights left on, scopes still
plugged in, eyepieces not put away, etc.) and make a note of it in the
log. Also check the previous few log entries to see if other keyholders
have made entries about problems with the equipment.
- Loosen
and unhook the four turnbuckles at the corners of the observatory.
- Unlock
the two dead bolt locks that secure the roof flap and push the flap out.
- Untie
the flap cord from the cleat and raise the flap. Make sure the flap is as
high as it will go or you will be unable to clear the roof gear at the
other end of the observatory when rolling back the roof.
- Tie
the cord back on the cleat making sure that there is no excess cord
hanging down to catch on the scopes as the roof is rolled back.
- Roll
the roof back using the hand crank near the computer room. The roof should
roll back easily. During the winter months snow on the back roof and
frozen moisture bowing the metal flashing on the roof can impede roof
motion. If the roof appears to be very difficult to remove DO NOT ATTEMPT
TO APPLY EXCESSIVE FORCE TO THE GEAR CHAIN MECHANISM. Use the ladder on
the back of the observatory to check the back roof for snow and ice.
Remove show/ice with the snow shovel taking care not to damage the roof or
chain. If it is still difficult to remove the roof then close the
observatory, make a note of the problem in the log and contact the
observatory chairman to apprise him of the problem. NEVER APPLY EXCESSIVE
FORCE TO THE GEAR/CHAIN MECHANISM.
- When
rolling the roof back do not attempt to roll it back all the way to the
end of the rails. Only roll it back about a foot beyond the back wall of
the observatory.
- Unlock Door and proceed immediately to
disable Alarm
- Adjust Red lights in Computer Room
- Open Computer Door and Power-up
Computer
- Power on Monitor
- Unlock and tie open Trap Door at South
end of Observatory
- Loosen and Disengage Roof Tie-down
Bolts
- Retract Roof using hand crank
- Log any observed anomalies in log book.
Setup -- Telescope - C14/Paramount
- Locate
Eyepiece case and place on work desk
- Remove
lens caps from C14, Finderscope, eyepiece holder and place in a safe
location on the work desk
- Check
operation/battery power of Telrad and JMI Focuser on C14. Note dead
batteries in log. Replace
batteries if necessary.
- Check
that eyepiece holder on C14 is securely attached to back of telescope
- Install
an eyepiece such as the 35mm Panoptic in the eyepiece holder on the C14.
ALWAYS PUT ONE OF THE HEAVIER EYEPIECES IN THE C14 BEFORE FIRST POWERING
UP AND SLEWING THE MOUNT IN ORDER TO MAINTAIN PROPER BALANCE
- Plug-in
Paramount power cable and switch on Mount
Setup -- Telescope - Refractor
- Remove
the brass lens cap from the front of the refractor.
- Remove
bungy-cord from the back of the refractor. Do not remove the bungy-cord
before removing the lens cap or the front of the telescope will swing
down.
- Place
the gray 6” dew shield on the front of the refractor to reduce dew buildup
on the lens.
- Remove
film canister from refractor diagonal.
- Place
an eyepiece (1.25”) in the refractor diagonal.
- Plug-in
Losmandy power cable and switch on clock drive.
- Turn
on Telrad.
- Center
a star in the eyepiece field of view and check the alignment of the
finderscope and Telrad, adjust if necessary. The refractor may be moved
manually in all directions and will track any object it is pointed to.
- Remove bungy cables securing telescope
carefully noting their routing for later re-installation
- Remove lens caps from front and rear of
telescope and finderscope
- Plug-in Losmandy power cable and switch
on clock drive
Setup -- Computer
- Note
functioning of warm-box infra-red heat system to maintain constant
temperature of computer in winter. This should maintain approximately 40-50
degrees.
- Adjust
computer clock by synchronizing with the electronic clock on the desk:
§
double-click on the time counter in lower right of
screen
§
adjust settings to about 30 seconds ahead of electronic
clock
§
watch electronic clock and click on "Apply"
when time matches your setting
- Launch
"The Sky" by double clicking icon on the desktop
- Activate
the mount by selecting from the menu: Telescope->Link->Establish
- Prepare
to Synchronize the Telescope Position
- Choose
a bright star well above the horizon in the East
- Double
click on this star in the sky picture and verify you picked the right one
- Center
image on the screen by clicking the icon in lower left corner of Object
Information pop-up
- Find
the "Slew" icon (a little telescope) at the bottom and click on
it
- Look
out at the telescope and call out "Ready to Slew?"
- If all
is clear click on the Slew button but KEEP AN EYE ON THE SCOPE
- If the
scope does not head for the star you picked immediately CLICK CANCEL
- You
must now position the scope manually on the star using the paddle
- Manual Synchronizing Procedure:
- Look
through the Eyepiece and verify that your chosen star is dead center in
the eyepiece; use the hand paddle motor drive to correct if
necessary. Note that higher power
eyepieces are more accurate.
- Return
to computer and click the Telescope tab of the Object Info Pop-up
- Click
Sync; Click Ok to confirm Sync
- Telescope
should now be properly located.
Verify by choosing another object and slewing to it to confirm
proper synchronization.
Operation
- Enjoy
your evening by locating and VIEWING a number of objects around the sky.
- Always
warn others before slewing the telescope
- Be
prepared to cancel any slew if the telescope makes strange noises or
if it starts on a path pointing towards the ground
- If you
cancel, manually (i.e., motor drive with hand paddle control) return the
scope to a known position and re-sync.
Test safe operation by slewing first to an object near-by
- Should
computer fail to cancel a slew, POWER OFF MOUNT immediately to avoid
damage to mount
- Continue
to check secure attachment of diagonal and eyepiece...especially when
switching eyepieces
- Note
any irregularities of operation in log book; similarly, share any special
finds in the log
Shutdown -- C14/Paramount
- Check
fellow observers to be sure they are clear of telescope for moving it to
park position
- Click
on an object to open the object information pop-up if necessary
- Select
the Telescope Tab
- Call
out "Slewing or Parking Telescope" and click on Park
(alternatively you can do this from the menu by selecting
Telescope->Options->Park from the top menu of The Sky
- Keep
your eye on the scope until it is safely parked in a horizontal position
being prepared to cancel its motion should anything go amiss.
- Exit
from The Sky
- Shutdown
the computer using the shutdown menu found under "Start" in the
lower left corner of the screen
- Power
off the computer when you see message indicating this is safe
- Power
off Computer Monitor
- Close
and Secure Door to computer cabinet
- Power
Off and Unplug heater
- Power
Off Red Lights in Computer Room and turn on white light in observatory
- TURN OFF
TELRAD BY PLACING TOGGLE SWITCH (THREE POSITION SWITCH) IN CENTER OFF
POSITION.
- Turn
off JMI focuser.
- Remove
eyepiece and return to case. If dew
has formed or if it is exceptionally humid, always dry off the eyepieces
using the heat gun (hair dryer) before putting into case.
- Cap
all eyepieces, close case and return to shelf
- Locate
all lens caps and re-install on scope and finderscope. If it is exceptionally humid, blow hot
air from heat gun into the open dew cap end of the C14 before covering for
the night.
Shutdown – Refractor
- Return
the refractor to its initial horizontal position
- Turn
off Losmandy drive and unplug mount. Do not unplug mount before turning
off drive.
- Return
all eyepieces to case.
- Insert
film canister plug in refractor diagonal.
- TURN
OFF TELERAD.
- Reinstall
bungy cord to keep scope in horizontal position. Do not replace the brass
lens cap before the bungy cord is in place or the front of the telescope
will swing down.
- Remove
6” dew shield from front of refractor and store on shelf.
- Apply
a stream of warm air to the front of the refractor lens for 30 to 60
seconds using the heat gun (hair dryer). Do this even if there appears to
be no dew on the lens. DO NOT REPLACE BRASS DEW CAP BEFORE PERFORMING THIS
DRYING PROCEEDURE.
- Replace
brass dew cap on scope.
Return Refractor to its initial horizontal
Position
Turn off and Un-plug mount
Return eyepiece to case
Re-Install bungy cords to keep scope in
position
Re-Install Lens caps on scope and finderscope
Closing the Observatory
- Check
all items under Shutdown categories - especially the safe horizontal
position of scopes
- Crank
the Roof closed watching carefully to make sure it clears BOTH telescopes
- Lower
the Trap Door on South end of observatory
- Lock
the Trap Door and tie up the cord
- Secure
all 4 tie-down bolts
- Tidy
up everything and secure trash can
- Remove
all personal items from the observatory
- Close
bathroom door
- Check
time and note closing hour and final comments in the log
- Set
the Alarm for 5-10 minutes and switch on both switches
- Turn
off the main light switch and be sure computer room lights are off also.
- Close
computer room door and exit observatory
- LOCK
THE DOOR TO THE OBSERVATORY (TWO LOCKS)!
- Contact
Observatory Chairman if you found ANY problems at the observatory.
- Remember
to follow the gate locking protocol upon exiting the park.