Telescopes
150-cm Reflector Telescope
| Optical design | Ritchey - Chretien |
|---|---|
| Free aperture | 150 cm |
| Focal length | 1830 cm |
| Focal ratio | F/12.2 |
| Foci | Cassegrain, Nasmyth × 2, Bent-cassegrain × 2 |
| Location | Latitude 36°35′37″ N, Longitude 138° 58′ 35″ E, Altitude 885 m. |
Gunma Astronomical Observatory Echelle Spectrograph (GAOES)
This device is out of operation.
| Wavelengths | 360 - 1000 nm |
|---|---|
| Resolution | 75,000 ( slit 1.0" , 3.2 pixels ) 120,000 ( slit 0.6" , 2.0 pixels : max ) |
| Slit length | 8 arcsec ( 720 µm ) |
| Detector | EEV CCD44-82BI 15 µm × 15 µm pixel 2048 × 4096 pixels |
| Type | Semi-Littrow |
| Collimator | lens system |
| Camera | lens system |
| Echelle grating | R = 2.8, 31.6 gr/mm blaze angle ( 70.3 deg ) |
| Cross disperser | (red) 250 gr/mm ( blaze 698 nm, 5.0 deg ) (blue) 400 gr/mm ( blaze 415 nm, 4.8 deg ) |
| Efficiency | 10 % |
| Limiting magnitude | 11 mag, S/N = 100, 2 hours |
| Size | 1.37 m(D) × 1.74 m(W) × 0.9 m(H) |
| Weight | ~ 900 kg |
| Maker | Genesia corporation |
Gunma InfraRed Camera & Spectrograph (GIRCS)
| Detector | HAWAII (HgCdTe 1024 X 1024) 0."4 / pixel, Field of view: 6.'8 |
|---|---|
| Imaging | 10 filter positions
|
| Spectroscopy | 6 grism positions J (1114 - 1397 nm): R ~ 1000 H (1439 - 1794 nm): R ~ 900 K (1959 - 2397 nm): R ~ 1000 slits: 1", 2", 4" |
Gunma LOW resolution Spectrograph and imager (GLOWS)
| Chip | e2v CCD55-30 1250x1152 Back-illumination |
|---|---|
| Cooling | Peltier cooling |
| Field of view | 10 arcmin ( 0.6"/pixel ) |
| Filters | B, V, R, I, blank. |
| resolution | 400 ~ 500 |
|---|---|
| wavelength | 400 ~ 800 nm |
| slit length | 40 arcsec |
| slit width | 1.8 arcsec ( ~ 3 pixel ) |
CCD camera
This device is out of operation.
A new device developed by Saitama University has been fitted instead.
| Chip | SITe 1024 × 1024, Back-illumination Grade 1 |
|---|---|
| Cooling | cooled by Liq. N2 |
| Field of view | 10.0 arcmin ( 0.6"/pixel ) |
Eye pieces
Used for stargazing parties.
65-cm Reflector Telescope
| Optical design | Cassegrain |
|---|---|
| Free aperture | 65 cm |
| Focal length | 780 cm |
| Focal ratio | F/12.2 |
cameras
| camera | FLI / PL09000 | Apogee / AP7 | ZWO / ASI294 |
|---|---|---|---|
| pixels | 3056 × 3056 | 512 × 512 | 4144 × 2822 |
| pixel size | 12µm | 24µm | 4.6µm |
| pixel scale | 0.317" | 0.634" | 0.120" |
| field of view | 16.1'×16.1' | 5.4'×5.4' | 8.2'×4.7' |
| type | front illuminated ccd | back illuminated ccd | cmos |
Solar Telescope
30-cm Reflector (Gregorian Coude) and small telescopes.
gallery
projected image
projected spectrum
Small telescopes
6 small telescopes. (25 cm ~ 30 cm reflector)
Portable telescopes
10 portable telescope. (10 cm refractor & 20 cm reflector)
Small portable telescopes
There are several small portable telescopes.