... The SDSS 2.5-m primary mirror is supported in a manner similar to the Apache Point Observatory 3.5-m telescope primary. ... The axial support is provided by 48 air pistons. The pistons have the same diameter thereby applying equal forces with the same air pressure. ... Each group supports a 120њ sector of the mirror. ... Figure 1: CAD drawing showing the 2.5-m primary mirror and the locations of actuators (green circles) These actuators apply forces (10*cos2 N) to correct astigmatism. ...

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• Pointing error budget
• Spectrographic time budget
• Tracking error budget

For non-spherical isotropic particles, the classic variant of the RDG approximation does not include the anisotropy of the shape and hence does not give the correct Rayleigh limit, say, for small ellipsoids. ... We call this variant a modified RDG approximation (MRDG). ... First, the MRDG leads to the correct Rayleigh limit. ... The second approach to generalization of the RDG is connected with the use of the Born iterations for the scattering integral equation [ 95 , 124 , 132 , 264 ]. ...

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• Wavelength dependence
• Polarization properties (transmitted radiation)
• Colour-magnitude diagram.

... Step 1: The magnetic field line tracing from the satellite position up to magnetic equatorial plane using IGRF magnetic field model. Step 2: Tracing back from the point (produced on the Step 1) to the Ionosphere (by using only dipole magnetic field) . ... The magnetic field line tracing from the satellite position up to the Ionosphere (the stop trace altitude 110 km) using Main (dipole) + Extraterrestrial magnetic field model (for example, Tsyganenko [1987], or [1989], or [1990] ) . ...

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• The polar diagram plot description
• STDA files
• The Lagrangian Point L1

... These values are functions of the geographical (geodesic) latitude and the height of the point above the sea level. ... The option also permits to solve the reverse problem — to calculate approximate values of observatory latitude and its height above the sea level depending on the introduced values of dxy and dz. ... It should be mentioned that low precision of dxy and dz for some observatories in the list maintained by MPC leads to negative value of height above the sea level for some of them. ...

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• Keywords_133

... Step 1: The Footprint position calculation by the magnetic field line tracing from the satellite position up to the Ionosphere by using IGRF + Tsyganenko [1987] magnetic field model (the stop trace altitude 110 km). Step 2: Tracing back from the Footprint (produced on the Step 1) to the dipole equatorial plane (by using only IGRF magnetic field model up to the geocentric distance 8 RE and dipole field model after this distance). ... Back to the description . ...

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• Pictures/Рисунки
• The Lagrangian Point L1
• How distant is the Moon?

... The Galactic Center in Infrared . 8.07.2001 . ... In visible light, much of the Galactic Center is obscured by opaque dust. ... Outward bound, this primordial piece of the solar system is still just visible to the unaided eye and can now be sighted by northern hemisphere skygazers as it moves through the constellation Pisces. ... Hydrogen, Helium, and the Stars of M10 . ... Stars like the Sun use hydrogen for fuel, "burning" hydrogen into helium at their cores through nuclear fusion. ...

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Subject: Use of sig_p bit. ... alt_sig_p1: MOVE ISTAT and 0x08 to SFBR ; test the connected bit JUMP alt_sig_p2, if 0x08 ; either the chip got selected, reselected, and the sig_p bit may or may not have been set MOVE ISTAT and 0x20 to SFBR ; test the sig_p bit , if here safe to assume sig_p was set and not connected JUMP sig_p_ set , if 0x20 ; big error if here -- not connected and sig_p was not set ... sig_p_set: ; system processor has set the sig_p bit. ...

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• http://crydee.sai.msu.ru/ftproot/pub/comp/hardware/NCR/samp_code/ISA/sig710.txt
• Specifications
• Installing the packages

PHOTOMETRIC SEARCH FOR BLACK HOLES IN DORMANT X-RAY TRANSIENTS ґ ґ Aleksander Sadowski1 , Janusz Ziolkowski2 , and Krzysztof Belczynski3 ё Astronomical Observatory of Warsaw University, Al. ... Such definition means that our statistics for the number of expected BH X-ray binaries include both transient and persistent systems. ... If this value is 2 M , then, according to our calculations, Galaxy contains some 15 000 to 40 000 of BH X-ray binaries (and some 30 000 to 250 000 of NS X-ray binaries). ...

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• http://hea.iki.rssi.ru/integral06/papers/D32_Khamitov01-04Oct06_10:26:31.pdf
• http://hea.iki.rssi.ru/integral06/papers/B33_Schanne02-12Jan07_15:38:00_color.pdf
• http://hea.iki.rssi.ru/integral06/papers/B33_Schanne02-12Jan07_15:38:00_bandw.pdf

... This will be done by fitting period-luminosity relations in the form V = a в log P + b to Cepheid variables in these two galaxies. ... 8 Marks 2. ... 3R x3 2 Marks (b) Use this expression for the pressure to show that when 1 is constant, the adiabatic wave equation for the star can be written as x d d 3 R3 2 3 [(x - x4 ) ] + [ x - (31 - 4)] = 0. dx dx 1 GM 2 Marks (c) Show that near x = 0, the solution to this equation is of the form = Ax , where A is a constant and 2 = 3 (31 - 4). ...

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• http://www.mso.anu.edu.au/~brian/A3002/probset2-2008.pdf
• http://www.mso.anu.edu.au/~brian/A3002/probset2.pdf
• Worked Example 02

My colleagues and I have recently completed a series of observations of SN1999an. ... The telescope is located at Martin Observatory in Blacksburg, VA, and is operated by the Physics Department of Virginia Tech. Our IAU Minor Planet Center Observatory Code is 841. ... Attached you will find a copy of one of our images (in .jpg format) with the supernova indicated. ... Virginia Tech Department of Physics . Back to Bright Supernovae . Back to Supernova 1999an . ...

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• Supernova 1998S in NGC 3877
• Supernova 1998ab in NGC 4704
• Supernova 1998W in NGC 3075

... Searching for Far Out and Wandering Worlds . ... The Real Reality Show: Would aliens be anything like us? ... The SETI Institute is after alien signals. Assuming another world is beaming a 1-million-watt radio signal in our direction, how far away can that source be before the signal is lost in intergalactic noise? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

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