Tohoku University Haleakala Observatories
Remote observatory for long-term monitoring of tenuous emissions from planetary atmosphere and magnetosphere
Overview
The Tohoku University Haleakala observatories were first installed in March 2006, with the aim of continuous monitoring of faint emissions from exosphere/magnetosphere of planets (Jupiter, Mercury, Saturn, etc.) We employ two telescopes (T60 and T40) with several kinds of unique instruments. This program is in collaboration with UH/IfA PLANETS.
Data
T60
T40
T40 is a 40-cm Schmidt-Cassegrain telescope coupled to a high-resolution (R=67,000) echelle spectrograph with an integral field Unit (IFU). A wide field-of-view monochromatic imager is attached onto the telescope.
T60 / VISP(Visible Imager and SPectrograph with coronagraphy)
■ Specifications
Telescope |
D=600mm, f=14400mm (F24) |
FOV |
imaging: 315″ circular,
Slit-A: 200″x2″ (60micro-m in width)
Slit-B: 200″x3.3″ (100micro-m in width) |
CCD |
E2V CCD 47-10, 13 micro-m/pixel, 1024×1024 |
Spatial scale |
0.52″/pixel |
Observing Mode |
Mode 1: Narrow-band filter imaging
Mode 2: Mid-res. slit spectroscopy
Mode 3: High-res. slit spectroscopy |
Mode 1
NB Filters |
[SII]6716+6731, NaD5890, etc. |
Mode 2
dispersion
resolving power
sensitivity |
(Single order grating, 630nm blazed)
20.3pm/pixel
10,000
0.69E-3 cts/R/s @ 630nm |
Mode 3
dispersion
resolving power
sensitivity |
(Echelle grating)
2.74pm/pixel
76,000
0.31E-3 cts/R/s @ 630nm |
T60 / High-resolution echelle spectrograph with IFU
The integral field unit (IFU) consists of 96 optical fibers (AFS50/125Y low-OH fiber from Fiberguide Industries). The fibers are arranged in 8 by 12 array at the telescope focus corresponding to 41″ by 61″ with a spatial resolution of 5.1″ on the sky. A micro-lens array is attached on the input end of the IFU to inclease a fill-factor and to control the NA of input beam. The IFU was developped at ATRC in Maui under collaboration with IfA/UH. A pellicle beamsplitter and a guiding camera was installed in front of the IFU input end to make precise pointing and tracking.
■ Specifications
Optical layout |
Near-Littrow |
Spatial platescale |
5.1″/fiber |
Wavelength platescale and Res.Pow. |
4.4pm/pixel and 67,000 |
FOV |
41″ x 61″ |
Wavelength coverage |
4.4nm for 672nm |
T60 / Wide-FOV Monochromatic Imager
■ Specifications
Spatial platescale |
42arcsec/pixel |
CCD Pixel number |
384 x 576 |
Spatial coverage |
6.91o x 4.61o |
5895A filter |
center wavelength:589.5 nm, bandpath:1.7nm |
6200A filter |
center wavelength:620.0 nm, bandpath:0.9nm |