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2721. Hartmann Screen Work
. Mike Carr/PU is on site working up the Hartmann screen to be mounted on the 2.5m telescope for work leading up to the next dark run. Caption precedes pictures . Mike has assembled the screen in the machine shop and is ready to transfer to enclosure. Another view. Steve Bastian was helping, too. Note the nice, clean machine shop area! . Pictures taken by Gretchen Van Doren/Apache Point Observatory.
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980612hart/hart.html -- 1.6 Кб -- 13.06.1998
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2722. Installatin of 3-Ton Hoist
The new 3-ton hoist (with enclosed motor and winch area, and more responsive controls) arrived yesterday afternoon. The mfg. rep arrived this morning and work started in ernest to install the new hoist andr emove the old. These pictures do not include taking the old hoist off; imagine the installation backwards! Captions preceed pictures . ... The old hoist (on left), the new hoist (on right). ... The mfg's rep works on removing the old hoist. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980604hoist/hoist.html -- 2.7 Кб -- 04.06.1998
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2723. Preparation for M1 Work
... The telescope assembly is horizontal. ... The end of the wind baffle (with radiation shield) is shown, as well as the secondary mirror support assembly. French prepares the spreader to hoist the wind baffle. ... The wind baffle is hoisted, and as the building is moved eastward, the crew walks the wind baffle off the pier. ... With the secondary support assembly and wind screen disassembled off the pier, the crew finishes preparing the M1 for future work down to the corrector plate. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980603disassy/disassy.html -- 3.2 Кб -- 04.06.1998
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2724. Light baffle installation
... The light baffles consist of the wind baffle that surrounds the telescope and doubles as a light baffle, the primary baffle that extends from the primary center-hole toward the secondary (left), the secondary baffle that extends from the perimeter of the secondary toward the primary (right), and the conical baffle that is suspended approximately halfway between the primary and secondary (middle). The wind baffle is covered with panels that are 25% porous to the wind. ...
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Ссылки http://www.apo.nmsu.edu/Site/SDSS.progress/19980524_Baffle_Installation/19980524.html -- 6.9 Кб -- 28.05.1998
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2725. Plug Plate Cartridge
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980203_FiberFeed/Cartridge.html -- 1.4 Кб -- 20.05.1998
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2726. Fiber Positioning System Performance
... Virtually the entire rear surface of the 2.5-m telescope primary support structure is covered by the Cassegrain instrument rotator. ... For spectroscopy, a plug-plate cartridge is mounted on the rotator in lieu of the camera. ... A fiber slit head assembly, on either side of each cartridge, is inserted into a socket in the corresponding spectrograph during the mounting process. ... The rotator ring girder is concentric with the hub and supports the spectrographs. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19980413_RotatorFEA/19980413.html -- 14.4 Кб -- 19.05.1998
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2727. Weather Summary
Sloan Digital Sky Survey Telescope Technical Note 19971102 . ... Because of the difficulty of visually detecting thin patches of clouds under dark conditions, an infrared (IR) scanner was constructed in 1993 to monitor nighttime cloud cover at Apache Point Observatory. ... The left diagram (Figure 1) shows the scanner coordinate system. ... The loci of points at 15њ intervals in scanner coordinates are plotted on an azimuth-altitude polar plot (Figure 3). ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19971102_IRScannerCoord/19971102.html -- 5.9 Кб -- 19.05.1998
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2728. Hipparcos Tycho catalog
... For this purpose, catalog entries for stars within 12њx6њ region centered at 12h 20m right ascension and 33њ declination were examined. ... In Figure 1, the distribution in Johnson V magnitude of all Tycho catalog entries for stars within 12њx6њ region centered at 12h 20m right ascension and 33њ declination is plotted . ... Figure 1 : Distribution of magnitude in Johnson V. This is for the 510 stars from the Tycho catalog in a 12њx6њ area in the center of the northern survey region. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970901_TychoDensity/19970901.html -- 6.7 Кб -- 19.05.1998
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2729. Preface
. I wish to thank Dr. John W. Evans for his helpful suggestions and comments during the preparation of this report. Also, I express my special grattitude to Mr. Robert B. Hunter Jr., without whose aid this program could not have continued without interruption, if at all.
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970822_Weather/Preface.html -- 1.5 Кб -- 19.05.1998
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2730. Weather Summary
... A General Summary of Sacramento Peak Weather, GRD Research Notes No. ... This report summarizes and discusses newly derived means for the period August 1954 through July 1974. ... Table 1 lists the monthly average maximum and average minimum temperatures for each of the years 1954 through 1974. ... Mean . ... Oct . ... Figure 6: Distribution of Mean Annual Precipitation, Sacramento Peak. ... Figure 9: Distribution of Mean Annual Precipitation, Sacramento Peak; Mount Peak; and Alamogordo, New Mexico ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970822_Weather/19970822.html -- 42.7 Кб -- 19.05.1998
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2731. Spectrographic time budget
... About 10% of the time is allocated to moving the telescope to the zenith and exchanging the spectrographic cartridges. ... Focus telescope (open-loop)* . ... TOTAL TIME (seconds) . ... This assumes two 60 second arc exposures and two 55 second readouts. ... Otherwise, the arc exposure will likely consist of a 30 second integration followed by a quick 28 second readout, half the normal time. ... The flat-field exposure can be read out with a quick 28 second readout, half the normal time. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970730_CartridgeCorrXchg/Spectrographic_timing.html -- 14.7 Кб -- 19.05.1998
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2732. Common corrector mount measurements
Sloan Digital Sky Survey Telescope Technical Note 19970728 Edward J. Mannery and Walter Siegmund . ... Common corrector mount inspection . ... The corrector nearest the secondary mirror, the common corrector (so named because it is common to both imaging and spectroscopic configuations) is located with respect to the telescope optics support structure by the common corrector mount. ... The fused silica common corrector is 32.5 inches in diameter and is 0.47 inches thick. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970728_CommonCorrMount/19970728.html -- 5.8 Кб -- 19.05.1998
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2733. Secondary baffle measurements
... angle (degrees) . inches . ... average . ... range . ... specification . ... tolerance . ... 2ry baffle tip thickness . ... 2ry baffle tip overhang . ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970703_MirrorBaffles/Secondary_measurement.html -- 16.2 Кб -- 19.05.1998
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2734. Primary baffle measurements
... angle (degrees) . inches . ... 135 . ... average . ... range . ... specification . ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970703_MirrorBaffles/Primary_measurement.html -- 10.1 Кб -- 19.05.1998
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2735. Mirror baffle measurements
... Secondary Baffle . ... The outside diameter of the tip of ring 5 (the secondary baffle tip) was 1285.7 mm with a range of 0.8 mm p-v. The specifications were 1284.6 and 7.6 mm respectively. ... The outside diameter of the base of ring 5 was 1273.4 mm with a range of 2.0 mm p-v. The specifications were 1272.1 and 8.1 mm respectively. ... The inside diameter of the tip of ring 19 (the primary baffle tip) was 857.7 mm with a range of 0.8 mm p-v. The specifications were 858.0 and 8.6 mm respectively. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970703_MirrorBaffles/19970703.html -- 10.2 Кб -- 19.05.1998
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2736. Pointing error budget
Sloan Digital Sky Survey Telescope Technical Note 19970527 Walter Siegmund . ... Pointing Error Budget . ... The interleaved strips and adjacent stripes overlap about 1 arc minute. ... However, a 2-D pointing accuracy of 3 arc seconds RMS leads to acceptibly uniform overlap and minimises the number of cases that require special handling (Table 3). ... A guide fiber bundle diameter of 16.5 arc seconds and a pointing accuracy of 3 arc sec RMS results in 99% initial success in acquiring guide stars. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970527_PointErrorBudget/19970527.html -- 12.4 Кб -- 19.05.1998
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2737. Tracking error budget
Sloan Digital Sky Survey Telescope Technical Note 19970523 Charlie Hull and Walter Siegmund . ... A tracking error budget corresponding to the goal is given in that Technical Note. This budget was subsequently updated based on measurements in "2.5-m Telescope Drive Measurements IV: Acceptance Testing" (Sloan Digital Sky Survey Telescope Technical Note 19950608). Table 1 : Tracking error budget. ... Drive disk 2-D high freq. error . ... Az encoding error . ... Encoder capstan error . ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970523_TrackErrorBudget/19970523.html -- 10.8 Кб -- 19.05.1998
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2738. Telescope Parameters
... Wind Baffle Parameters . ... As part of this analysis, the volume, mass, center of gravity and mass moment of inertia of the telescope and optics support structure (OSS) were computed. ... The total moment of inertia of the circular floor panel, wind baffle and telescope in azimuth should be correct to 30% but is dependent on estimates of the mass of equipment supported below and above the circular floor panel. ... Table 8 : Masses and mass moments of inertia of the wind baffle components. ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970514_BasicTelescopeInfo/19970514.html -- 20.6 Кб -- 19.05.1998
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2739. Conical Baffle Measurements
... However, to avoid excessive central obscuration, a conical baffle is necessary in addition to the usual primary and secondary baffles. ... At that time, it was complete except several outside ribs remained to be attached and the upper and lower edges needed to be chamferred. ... The cone was measured at four equally spaced locations very near its upper and lower edge (Table 3). ... A tape measure was used to measure four diameters of the baffle at its upper and lower edges (Table 4). ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970320_ConicalBaffle/19970320.html -- 14.4 Кб -- 19.05.1998
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2740. Moth Behavior
... Air Jets . Lights and Zappers . ... The moths have a variety of behaviors. ... Box #4 had one moth in it, while box #5 had nine moths. ... Amplitude Frequency Reaction 2 Vpp 0.2 kHz none 0.3 kHz very slight 0.4 kHz startled but settled soon 0.5 kHz none 0.6 kHz 1 moth noted moving briefly 0.7 kHz none 0.8 kHz none 0.9 kHz none 1.0 kHz none 1.1 kHz none 1.3 kHz none 1.5 kHz none 3.0 kHz none 5.0 kHz none 10.0 kHz disturbed but not moving 11.0 ...
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Ссылки http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19970220_Moth/19970220.html -- 34.7 Кб -- 19.05.1998
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