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Article
Earth encounters as the origin of fresh surfaces on near-Earth asteroids
The 'ordinary chondrite problem' has been a factor in Solar System astronomy for three decades. It refers to the apparent anomaly that whereas about 80% of the meteorites falling to Earth are 'ordinary chondri...
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Article
Semi-annual oscillations in Saturn’s low-latitude stratospheric temperatures
Both Earth and Jupiter have equatorial oscillations in their atmospheres, with two-year and four-year periodicity respectively. Two groups working independently now report a related phenomenon on Saturn. Orton et...
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Article
The Structure of Young Stellar Jets and Winds Revealed by High Resolution [Fe II] λ1.644μm Line Observations
We present high angular resolution spectra taken along the jets from L1551 IRS 5 and DG Tau obtained with the Subaru Telescope. The position-velocity diagrams of the [Fe II] λ 1.644 μmemission line revealed re...
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Article
A faint object spectrometer for the infrared
A cryogenic astronomical spectrometer for the NASA Infrared Telescope Facility is described. This spectrometer will employ an array of at least 20 detectors and provide a resolving power of 100 to 1500 at 1–5 ...
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Article
The 20-µm brightness temperature of the unilluminated side of Saturn's rings
The 20-µm brightness temperature of the unilluminated (north) side of Saturn's rings is reported here to be 56±1 K. This measurement, together with previous measurements of the rings at 20 µm, shows that the b...