Celestron 14 Manuale Utente Scaricare il pdf (Pagina 1)

Operating the Celestron 14” Telescope

1. The Telescope and Its Controls

The Celestron 14-inch telescope is located in the east bay of the observatory (Fig. 1).

It is a Schmidt-Cassegrain type instrument; its short tube is sealed by the correcting plate,

which also supports the secondary mirror. The telescope is now on a German equatorial

type mount. Attached to the telescope are a ﬁnder scope to help locating objects, and a

larger (5-inch) ﬁnder which is useful in guiding the telescope while taking a long exposure.

(The electrical drives on telescopes are not perfect, so long exposures must be guided.)

Mounted on the main telescope is an SBIG ST-8 CCD camera. This camera is

controlled by a computer which sits on a cart next to the telescope. The CCD is equipped

with a ﬁlter wheel with ﬁve ﬁlters: clear ﬁlter, broad-band V and R ﬁlters, and narrow

interference ﬁlters which isolate the nebular emission lines of hydrogen (Hα) and oxygen

([O III] λ5007).

1.1. Turning Things On

1. First ﬁll out the log book, which is facing you as you enter the Observatory. Don’t

forget the temperature, which you get from the thermometer on the telescope nearest

the door to the east bay.

2. If the weather is acceptable, open the roof. Key-switch is on far wall, away from the

door by which you enter the telescope-area. This should be done about an hour before

you start observations in order to give the telescope time to come to temperature

equilibrium. The telescope’s focus depends on temperature.

3. Using the ladder, take oﬀ the various lens covers - one from the primary of the 14-inch,

one from the objective end of each ﬁnder. Be careful not to move the telescope

manually while removing the covers.

4. Carefully install the dewshield at the top of the telescope. Make sure to use the ladder

for this.

5. Remove any obstructions to telescope movement from the vicinity of the telescope,

especially ladders.

6. The computer which controls the SBIG ST-8 CCD camera is stored in the old wet

dark-room in the central bay. Roll it out and place it near the telescope. A power cord

1 2 3 4 5 6 ... 10 11

Sommario

Pagina 1 - 1.1. Turning Things On

Operating the Celestron 14” Telescope1. The Telescope and Its ControlsThe Celestron 14-inch telescope is located in the east bay of the observatory (F

Pagina 2 - The Telescope and Computer

will ﬁrst take a dark exposure, download it, then take your requested exposure. The dark(bias) will be subtracted from your exposure and the image dis

Pagina 3 - 2. Operating the Telescope

7. Parking the Telescope & Shutting DownWhen you have ﬁnished observing, follow this shut-down procedure:1. Press ”MENU” until you have reached th

Pagina 4

Fig. 1.— The Telescope and ComputerA – Power strip for telescopeB – Data cable for computer/CCD link2

Pagina 5

for the computer is wrapped around a black bracket on the leg of the cart. Plug it intothe power outlet on the telescope pier. The light grey cable fr

Pagina 6

3. GOTO Button – Press this after you have selected a target. The telescope will thenslew to the object.4. + − Button – It has two functions: (1) togg

Pagina 7

the side of the mount which will place the telescope in the higher position, and beginsslewing in both RA and declination simultaneously.Watch the mou

Pagina 8 - The Drive Control Paddle

Fig. 2.— The Finding Scopes and CCD CameraA – The 5” guiding scope with illuminated cross-hairsB – Eyepiece (operates when diagonal mirror is in)C – S

Pagina 9 - 4. Using the CCD Camera

Fig. 3.— The Flip Mirror and CCD CameraA – Eyepiece (operates when diagonal mirror is in)B – Knob to ﬂip diagonal mirror in/outC – Micrometer to focus

Pagina 10 - 6. Saving your images

Fig. 4.— The Drive Control Paddle8

Pagina 11

are aligned in one part of the sky (e.g. if you centered the bright star discussed above onthe cross-hairs of the guiding scope), when you move to a d