Night log #435: Very, very bad seeing averaging 4 arcsec to start. From Wordnik.com. [A Grand and Bold Thing] Reference
Uranus is 2,856m km wide at opposition, its blue-green disc only 4 arcsec wide. From Wordnik.com. [Jupiter at opposition in September night sky] Reference
Jupiter shows a large 50 arcsec disc through a telescope, while binoculars reveal its four main moons. From Wordnik.com. [Jupiter at opposition in September night sky] Reference
For reference, the full moon is ~0. 5 degrees = 30 arcminutes = 1800 arcsec across, and 1 arcsec ~ 5e-6 radians. From Wordnik.com. [Two Trinities] Reference
Rising at about 04:00, it dims from mag –4.7 to -4.5 as its crescent shrinks from 42 to 27 arcsec in diameter. From Wordnik.com. [Starwatch: The December night sky] Reference
In its highest frequency band, and in its widest observing mode, the VLA has an effective resolution of 0.05 arcsec. From Wordnik.com. [Two Trinities] Reference
Telescopes show it as 41 arcsec wide at midmonth and may already be revealing early signs of the return of the main dark cloud band in Jupiter's S hemisphere. From Wordnik.com. [Starwatch: The December night sky] Reference
The M-660 stage reaches top speeds of 720 degrees/sec. and resolution to 40 µrad (8 arcsec). From Wordnik.com. [R&D Mag - News] Reference
Attitude determination is performed using an autonomous high-accuracy (5 arcsec over 10 seconds) two-head startracker, GPS sensors and a three-axis magnetometer. From Wordnik.com. [NASASpaceFlight.com] Reference
According to the preliminary orbit, 2010 AL30 will approach Earth at about 0.34 lunar-distance at 1248 UTC on 13 Jan. 2010 at magnitude 14 and it will be moving at about 10 arcsec/sec. From Wordnik.com. [Megite Technology News: What's Happening Right Now] Reference
It will obtain ultraviolet spectra and images with high resolution (1 / 3 arcsec) - with a cadence of as little as one second apart - focused on the chromosphere and the transition region. From Wordnik.com. [WebWire | Recent Headlines] Reference
However, the interpretation of the FUSE data is complicated by the very large FUSE aperture (30 arcsec), the modest S/N, and the limited selection of species available in the FUSE bandpass. From Wordnik.com. [SpaceRef Top Stories] Reference
We will measure the metallicity distribution functions and stellar density profiles from star counts down to very low average surface brightnesses, equivalent to ~32 V-mag per square arcsec. From Wordnik.com. [SpaceRef Top Stories] Reference
Typical X-ray diffraction (XRD) rocking curve linewidths are less than 1000 arcsec for GaN deposited on silicon, below 500 arcsec for GaN grown on sapphire, and under 200 arcsec for GaN epitaxial layers on SiC. From Wordnik.com. [Compound Semiconductor] Reference
I'm fully expecting to get into work this afternoon to encounter a 15 arcsec pointing error, because I'm pretty sure we never got around to fixing the automatic parsing of the IAU bulletins in the implementation of the UTC-TAI calculation in the new telescope control system. From Wordnik.com. [The Musings of Chris Samuel] Reference
(30 arcsec), the modest S/N, and the limited selection of species available in the FUSE bandpass. From Wordnik.com. [SpaceRef Top Stories] Reference
Sun pointing to 100 arcsec accuracy is expected. From Wordnik.com. [NASASpaceFlight.com] Reference
5 arcsec radius. From Wordnik.com. [SpaceRef Top Stories] Reference
0.25, and 0.35 arcsec, FWHM, and sharpness. From Wordnik.com. [SpaceRef Top Stories] Reference
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