	Tohoku University Haleakala Observatories
	Remote observatoy 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.

Haleakala Long-term Monitoring Program

T60

T60 is a 60-cm reflective telescope with Cassegrain and Coude foci. Daily operation is usually made remotely or semi-automatically. It has four kinds of instruments dedicated for various observing targets:

DIPOL-2 (Cassegrain)- A double-image high precision polarimeter (ADS)
MILAHI (Coude No.3)- Mid-Infrared Laser Heterodyne Instrument (Nakagawa et al. 2016)
VISP (Coude No.0)- Visible Imager and Spectrograph with coronagrphy
Planetary Imaging Camera (Coude No.0A)
Additional three Coude ports are avirable for guest instruments.

T60 optical layout | Dimension of frange plate at Cassegrain focus

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.

high-resolution echelle spectrograph with IFU
wide-FOV monochromatic imager

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, 1024x1024
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		(Single order grating, 630nm blazed)
dispersion		20.3pm/pixel
resolving power		10,000
sensitivity		0.69E-3 cts/R/s @ 630nm
Mode 3		(Echelle grating)
dispersion		2.74pm/pixel
resolving power		76,000
sensitivity		0.31E-3 cts/R/s @ 630nm

T40 / 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.
See details for users's guide. 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

T40 / Wide-FOV Monochromatic Imager

Specifications (2007-)

Spatial platescale		42arcsec/pixel
CCD Pixel number		384 x 576
Spatial coverage		6.91^o x 4.61^o
5895A filter		center wavelength:589.5 nm, bandpath:1.7nm
6200A filter		center wavelength:620.0 nm, bandpath:0.9nm