nasa infrared telescope facility (irtf) · flexible scheduling and remote observing: • observing...
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NASA Infrared Telescope Facility (IRTF)
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Alan Tokunaga
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Current status
• The IRTF is operated by the University of Hawaii under a a 5-year contract with NASA.
• 50% of the IRTF time is for solar system researchand 50% is for astrophysics.
• We typically get about 50 proposals each semester from the planetary community. – Many proposals are for partial nights and for multiple
observing periods. – Most of our observers do their observations remotely
from locations of their choice.
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Uniqueness for NASA Missions and Planetary Astronomy:
• A dedicated facility for planetary astronomers.• Timely ground-based observations in support of
planetary missions.• Training students and a platform for new instruments.
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Uniqueness for NASA Missions and Planetary Astronomy:
A dedicated facility for planetary astronomers.
• Priority for time critical planetary observations:
• Required solar phase angle, specific planetary features, new comets, new Near-Earth Objects, occultations, daytime observations of comets and planets.
• Unexpected mission requirements.
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Observations of an NEO with a shape model from radar observations. The observations are obtained at specific phase angles. Howell et al.
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Flexible scheduling and remote observing:
• Observing periods as short as 1 hour.• Multiple short observations possible with remote observing.• Unique instruments:
SpeX/MORIS – Low-to-moderate spectral resolution for 0.8-5 µm with simultaneous visible imager.
iSHELL – R=70,000 spectral resolution at 1.2-5.3 µm.TEXES – R=100,000 spectral resolution at 8-25 µm.MIRSI – 8-25 µm camera, available 2017B. Upgrade with
closed-cycle cooler and CCD camera.
http://irtfweb.ifa.hawaii.edu/Facility/ 7
Uniqueness for NASA Missions and Planetary Astronomy:
Timely ground-based observations in support of planetary missions.
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SpeX images in support of Juno
Image from Glenn Orton showing an image of Jupiter obtained with SpeX at 5 mic compared to observations made by the Microwave Radiometer on Juno.
Observations were made on Aug. 27 in the daytime when Jupiter was about 20 degrees from the sun.
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10/20/16 9Observations of Jupiter during Juno perijove, Aug. 2016
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Insert photo of remote observing from DPSObservations of Jupiter during Juno perijove, Oct. 19, 2016
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North Tropical Belt disturbance observed Oct. 19, 2016 by Orton et al. Observations made in the methane band so bright clouds are at high altitude.
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NEO observations rapid responseMoskovitz et al.
• Pluto obs.
• NEO flyby
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CO band
N band2
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Uniqueness for NASA Missions and Planetary Astronomy:
Training students and a platform for new instruments.
• Classical observing and visitor instruments welcomed. Remote observing expands opportunity for training students.
• Unique visitor instruments include TEXES and BASS and are available for use by the community with PI approval.
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For example remot observations have been a good teaching tool for Caltech SURF, NASA USRP and JPL SIRI students.
Below: planning, obtaining and analyzing IRTF data.
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Distribution of Allocated Observing Time (2016B)
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iSHELL, R=70,000
SpeX, R=250-2,500
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K-band spectrum taken with iSHELL during commissioning
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Spectrum of bright star taken with iSHELL showing orders 223-226 and comparison to SpeX.
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Staff at the IRTF
They keep the telescope and instruments running.
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http://irtfweb.ifa.hawaii.edu/
Poster 123.39
John Rayner, Bobby Bus, Alan Tokunaga
Proposals due:
01 April, 01 October