Skywizard_use_notes_verB.ppt

Skywizard menu overview
• Menu system for general session
• POWER on
• MODE
• CATALOG
• FIND
• IDENTIFY
• RA DEC
• SYNC
• TIMER
• POWER off
(lookup/set current object)
(slew to current object)
(unknown object in eye-p)
(display coordinates)
(tune wizard w/ object)
(time astrophotograph)
ENTER
Process
Analogy to physical circles – Direct indexing
Two methods of finding - Direct indexing
Physical circles
Digital circles - Skywizard
POWE
R
Slew to
Star1
ENTER
• Do power-up two-star alignment.
MODE
• Point the telescope at a bright alignment star.
• Slip the hour and declination circles to correspond
to catalogue RA and Dec of the alignment star.
• “Direct index” slew to target star’s RA and Dec.
Drawing from Edmund Mag. 5 Star Atlas (12th ed 1994)
RA DEC
ENTER
Display
coordinates
• Go into RA Dec Mode.
• “Direct index” slew to target star’s
RA and Dec.
Analogy to the physical circles – Indirect indexing
Two methods of finding - Indirect indexing
Physical circles
• Point to a waypoint bright
star.
• On star chart, measure RA
and Dec change to the
target.
Digital circles - Skywizard
MODE
Drawings from Edmund Mag. 5 Star Atlas (12th ed 1994)
ENTER
• Que pre-programmed waypoint
star in Catalogue mode
MODE
• Slip the hour and
declination circles equal to
that change.
• “Indirect index” to the
target.
CATALOG
FIND
ENTER
• Enter Find mode
• Slew to waypoint star using Find
• On star chart, measure RA and
Dec change to the target.
• Still in Find mode, slew indirect
index distance to target.
Relationship of local sidereal time, target right ascension (RA) and meridian swap
• Local sidereal time measures the position of the meridian on your star charts.
• On the observing night, keep an extra watch set to local sidereal time (LST). Obtain LST from << http://tycho.usno.navy.mil/sidereal.html >>
• A meridian swap will be needed if:
• RA current target > Local sidereal time > RA Desired target - or
• RA current target < Local sidereal time < RA Desired target
• A meridian swap is not needed if:
• RA current target & RA Desired target > Local sidereal time - or
• RA current target & RA Desired target < Local sidereal time
Zenith
Meridian
10 00 RA
08 00 LST
03 30 RA
13 00 RA
14 00 RA
02 00 RA
Looking south
Power on – One star startup alignment 1 - Ealing
• On startup [POWER]
• For pre-“perfectly aligned German Equatorial” install mode,
the startup routine skips several complicated steps and goes
immediately to startup alignment using two stars.
• One star orientation-alignment
• Select one star in eastern sky based on 24 pre-selected
stars above Dec. -30°. See Navigational Bright Star Chart and
Table of 24 Alignment Stars by name and right ascension.
• In practice, find one bright star of the 24 listed stars more
than 30° of the meridian and near the celestial equator.
• Following selection of star the “Warp” measurement will
always display “0” and is meaningless in this context.
Power on – One star startup alignment 2 – Ealing
• One star alignment process
POWE
R
Warp
result
Slew to
Star1
War
p =0
No
ENTER
RA DEC – display current coordinates
MODE
RA DEC
ENTER
Display
coordinates
Catalogue – lookup/set current object
MODE
CATALOG
ENTER
ENTER
• Star
• MESSIER
• NGC
• IC
• UGC
ENTER
Object no.
display 0000
0…9
ENTER
PLANETS
ENTER
Planet name
Display object
coordinates
Find – slew to current object
MODE
MODE
Do
CATALOGUE
process
FIND
Set
current
object
ENTER
If 10°>
displays“10”
If 10°<“1.0”
Slew
telescope
towards
object
No
Display
coordinates
At
target
?
Yes
Identify – Unknown object in eyepiece
MODE
IDENT
Magnitude
set display
00
ENTER
0…9
ENTER
• IDENT
• IDENT
• IDENT
• IDENT
• IDENT
• IDENT
• IDENT
• IDENT
• IDENT
ANY MAG 10
ST MAG 10
GC MAG 10
OC MAG 10
GX MAG 10
PN MAG 10
NB MAG 10
2* MAG 10
R* MAG 10
Display 1st
catalogue
object
No
Any type of object
Any star
Any globular cluster
Any open cluster
Any galaxy
Any planetary nebula
Any nebula
Any double star
Any red star
At
target
?
Yes
Display
object info
ENTER
Sync – Fine tune digital circle setting with current object
MODE
Do FIND
process
Uses
CATALOGUE
process
Found
object
centered in
eyepiece
MODE
SYNC
Timer – Time astrophotograph exposure
MODE
TIMER
ENTER
Timer
display
start
ENTER
Timer
display stop
Timer display
reset 00:00:00
MODE
ENTER
Other use notes
 Because of a friction belt in the digital to analogue encoders,
slowly slew the scope.
 The more rough slews, the more position error the friction
encoders will accumulate.
 Plan your observations to include stops at the 24 alignment
stars through the evening. Re-SYNC the digital setting circle
frequently.

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