My Sky

My Sky: Database of 600+ objects (excel spreadsheet) that is programmed for ETX-125 Meade Telescope.  ENJOY!

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Jule’s Scope Specs

Eyepieces Focal Lengh = 1900mm / Aperture in inches  = 5 / fRation = 15
All Meade Super Plossol
Focal Ln mm Apparent FOV  ̊ Exit Pupil mm Power X True FOV  ̊ B-Low X2
40 50 2.7 47 1.1 94
32 82 2.2 59 1.4 118
26 50 1.7 73 0.7 146
15 82 1.0 126 0.7 252
12.4 100 0.8 153 0.7 306
9.7 68 0.7 195 0.3 390
9 68 0.6 211 0.3 422
6 0.4 296 592
Specifications: ETX-125PE Astro Telescope
Optical design . . . . . . . . . . . . . . . . . . . . Maksutov-Cassegrain
Primary mirror diameter . . . . . . . . . . . . . . . . . . 138mm (5.43”)
Clear aperture. . . . . . . . . . . . . . . . . . . . . . . . . . . 127mm (5.0”)
Focal length . . . . . . . . . . . . . . . . . . . . . . . . . . 1900mm (74.8”)
Focal ratio (photographic speed) . . . . . . . . . . . . . . . . . . . . f/15
Near focus (approx) . . . . . . . . . . . . . . . . . . . . . . . . 4.6m (15 ft)
Resolving power . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 arc secs
Super multi-coatings (EMC) . . . . . . . . . . . . . . . . . . . . standard
Limiting visual stellar magnitude (approx.) . . . . . . . . . . . . 12.5
Image scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.76°/inch
Maximum practical visual power . . . . . . . . . . . . . . . . . . . 500X
Optical tube dimensions
(dia. x length) . . . . . . . . . . 14.6cm x 36cm (5.75” x 14.2”)
SmartFinder . . . . . . . . . . . . . . . . . . . . . . 8 x 25mm right-angle
Secondary mirror obstruction (dia.; %) . . 39.4mm (1.6”); 9.6%
Telescope mounting . . . . . . . . . . . . . . . . fork type; double tine
Setting circle diameters . . . . . . . . . . . . . . . Dec.: 4.3”; R.A.: 9”
SmartFinder. . . . . . . . . . . Red dot projected onto finder’s lens
LNT Module . . . . . . High accuracy, temperature-compensated
. . . . . . . . . . . . . . . . . oscillator, updatable using Meade’s
. . . . . . . . . . . . . . . . . . . . . . . . optional ATUM accessory
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 volts DC
Motor Drive System . . . DC servo motors with encoders, both axes
Bearings:
Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ball bearings
Azimuth . . . . . . . . . . . . . . . . . . . . . . . . . . . . ball bearings
Materials:
Tube body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . aluminum
Mounting . . . . . . . ABS, with internal aluminum structure
Correcting lens . . . . . . . . . . . BK7 optical glass, Grade-A
Telescope dimensions:
. . . . . . . . . . 48cm x 23cm x 27cm (19” x 8.9” x 10.8”)
Telescope net weight:
(incl. AutoStar & batteries) . . . . . . . . . . . 6.9kg (15.2 lbs)
Telescope shipping weight. . . . . . . . . . . . . . . 11.4kg (25.2 lbs)
Battery Life (approx.):
with AutoStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 hrs
49
AutoStar Specifications
Processor ………………………………………………………………….68HC11, 8MHz
Flash Memory ……………………………………………………1MB, reloadable
Keypad ………………………………………………………………20 key alphanumeric
Display ………………………………………………………………2 line, 16 character LCD
Backlight…………………………………………………………….Red LED
Utility Light …………………………………………………………Yes
RS-232 ………………………………………………………………Yes
Coil Cord …………………………………………………………..24″
Database …………………………………………………………..30,223 objects
AutoStar Dimensions
Length ………………………………………………………………6.56″ (16.6cm)
Width (LCD end) ………………………………………………..3.19″ (80cm)
Width (Connector end)…………………………………………2.25″ (57cm)
Depth ………………………………………………………………..0.81″ (21cm)
AutoStar net weight …………………………………………….1.12 lbs (0.51kg)
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Zen and the Art of Astronomy

I’ve experienced Zen Astronomy before. I know that it is possible to manage all of the equipment that goes into viewing the Universe and still maintain a Zen state of mind. I know what it feels like when the observer, the observed, and the observing tools all work together. I just want more of it.

I’ve tripped over my last cord. I’ve tripped over my last tripod leg. I’ve thrown my last fit because I couldn’t find my eye glasses in the dark. I’ve spilled my last cup of coffee on my sky charts and notebook. I’ve dropped and stepped on my last eyepiece. I’ve knocked my telescope out of alignment for the last time. I’ve knocked my body out of alignment while looking through my telescope for the last time. I’ve said my last cuss word for a multitude of reasons:because the velcro that is supposed to stick my flashlight to the tripod leg is now sticking my flashlight to my glove; because my pen has rolled off the table; because my neighbor just turned on his outside light; because for the zillionth time I’ve entered an SAO for a double star that I’m just DYING to see, and it isn’t in the autostar database.

After this diatribe, one might wonder why I bother at all to look at the stars. The answer is mostly unspeakable, but has to do with beauty, mystery, and an almost insane curiosity.

So how does one do Zen Astronomy? Just keep it slow and simple. One quantum arc-second leap at a time. 

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