HST Call for Proposals and HST Primer for Cycle 24 . ... Hubble Space Telescope Primer for Cycle 24 > Chapter 6: Orbit Calculation for a Phase I Proposal > 6.1 Overview of an Observing Program . ... Definitions (HST Orbits, Orbital Visibility Periods, and Visits) . ... See Section 3.2 for details on telescope guiding. ... Lay out all the exposure and overhead times for the program into visits (described in Section 6.5 ) and add up the number of orbits from each visit to obtain the total orbit request. ...

Tail Probe is one of the satellites of the INTERBALL program. ... Collection of the orbital elements | ... Flight situation analysis during operations scheduling . ... Two stages of the orbital situation analysis are presented: . ... The satellites motion calculation during the flight situation analysis is based on the orbital elements, determined by the Ballistic center at KIAM RAN. The modified (by backward integration) orbital elements are usedduring the aposteriory situation analysis. ...

The orbital period of a satellite increases as its mean distance from Earth grows. The space shuttle in a low altitude circular orbit, just above the atmosphere, completes one circuit in about 90 minutes. ... If you have a suitable calculator, you can easily chek the value of T for R=6.6] A satellite orbiting above the equator at that distance keeps its position above the same spot on the ground; hence this is known as the synchronous orbit, from the Greek syn--same, chronos--time. ...

. Next: Applications of CCF Up: ZODIACAL Previous: Generation from Ground Calibration Contents . It is not expected to update these CCF files on the short term, neither is there a dedicated calibration activity. However on the longterm it will be possible to estimate the diffuse background components, namely DGL and zodiacal light (cf. section 4.5.13 ). Michael Smith 2011-09-20

Next: The Scenario Machine: Operational Up: Evolution of Magnetic Rotators Previous: Ejector-propeller hysteresis . ... The length of this segment is determined by the eccentricity. ... In this case no hysteresis occurs and transitions E -- P and the reverse take place in symmetrical points of the orbit. ... Here EP means a mixed state of the rotator at which it is in the ejector state during one part of the orbit, and in the propeller state during the rest of the orbital cycle. ...

... The Big Dipper . ... This common question frequently precedes the rediscovery of one of the most commonly recognized configurations of stars on the northern sky: the Big Dipper. ... This skyscape finds an esthetic balance of interstellar dust and gas residing in the suburbs of the nebula rich constellation of Orion. ... Sculpted by stellar winds and radiation, the star factory known as Messier 17 lies some 5,500 light-years away in the nebula-rich constellation Sagittarius. ...

... AMPLE (Adaptable Minor Planet Ephemerides) is integrated software package to deal with a number of problems concerning minor planets with the aid of IBM-type personal computer. ... compiling a list of all numbered minor planets which can be seen at certain moment within specified sky region and visualization of their mutual positions; . ... As AMPLE is able to reproduce virtually any table of "the Ephemerides of Minor Planets" , it may be considered as computer version of the EMP. ...

... Binary orbits in the acceleration/period plane . Circular Orbits . ... We first present the equations for the period and acceleration of a pulsar in an eccentric binary system as a function of its position in the orbit. ... In Freire, Kramer & Lyne (2001) (from where most of this text and following equations are taken), we describe in more detail how circular binary orbits can be determined from the observed periods and accelerations of the pulsar. ... where is the orbital period of the binary. ...

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Orbital intersection . ... Structure of Taurid stream . ... Meteoroid swarm and Taurid fireballs . ... The following four diagrams schematically show four different Taurid orbits and the orbits of Earth and Jupiter. ... The Taurid stream contains particles (small, solid grains) at different stages of their precession cycles. ... The study of when a meteor stream can produce a meteor shower is the study of when precession brings orbits to intersection with Earth, or e.g. with Mars . ...

... SCHED supports observations on telescopes that have S2 recorders and are controlled through the Field System (FS9.3.7 or higher). ... For any other DAR SCHED will attempt to schedule the observation with a ``standard'' S2 mode, not using any knowledge on the content of the ``user signal''. ... Tape lengths for S2 tapes are specified as the length for standard US VCR recording in seconds. Thus, when the VCR cassette has 120 (minutes) on the label the tape lengths is 7200 (ft) in SCHED. ...

... Parameters of the Moon-perturbed orbit . ... From orbits consistent with this limitation and with the date of the launch October 1, 2000 as an example, an orbit was selected with apogee directed to the North Galactic pole at the begining and rotation of orbit plane was maximized. The initial state vector is given in the inertial coordinate system in epoch J2000.0. ... The orbit has initial perigee radius Rp=7000.0 km, initial apogee radius Ra=343000.0 km and initial period T=8.453 days. ...

Lunar Orbiter to the Moon (1966 - 1967) . ... Five Lunar Orbiter missions were launched in 1966 through 1967 with the purpose of mapping the lunar surface before the Apollo landings. ... The first three missions were dedicated to imaging 20 potential lunar landing sites, selected based on Earth-based observations. ... The Lunar Orbiters had an ingenious imaging system, which consisted of a dual-lens camera, a film processing unit, a readout scanner, and a film handling apparatus. ...

. Computer Ephemeris. Elements of osculating planetary orbits. Explanations. Each row contains at 0h of Time Dynamical Terrestrial of specified date in system of mean equator and ecliptic J2000.0 the ecliptic osculating elements of heliocentric orbit: inclination of orbital plane (degrees), longitude of ascending node (degrees), argument of perigelion (degrees), semimajor axis (astronomical units), mean motion (degrees per day), eccentricity (dimensionless), mean anomaly (degrees).

Next: Triple with velocity curves Up: Fit scenarios Previous: Double-lined spectroscopic binary Contents . Add the remaining astrometric orbital elements to the fit parameters, and vary the secondary mass only. ... In this case, you may add also the primary mass to the fit parameters as the system is now constrained just like a double-lined spectroscopic binary. ...

... 2011 December 7 . Kepler 22b: An Almost Earth Orbiting an Almost Sun . Illustration Credit: NASA / Ames / JPL-Caltech . ... The planet's host star, Kepler 22 , is actually slightly smaller and cooler than the Sun , and lies 600 light-years from Earth toward the constellation of the Swan ( Cygnus ). The planet, Kepler 22b , is over twice the radius of the Earth and orbits slightly closer in, but lies in the habitable zone where liquid water could exist on the surface. ... About APOD | ...

. This graphic depicts the Mars Climate Sounder instrument on NASA's Mars Reconnaissance Orbiter measuring the temperature of a cross section of the martian atmosphere as the orbiter passes above the south polar region. // NASA-JPL

... Gallery . ... Mars . ... Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Deimos orbiting Mars . ... In the animation, Deimos is moving along its orbit around Mars. Each frame is around 10 minutes apart. NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... Deimos orbiting Mars An over-exposed Mars and one of its moons, Deimos (faint spot in lower-left quadrant). ...

Outer Natural Satellites Orbits Ephemerides. ... Choose type of the ephemeride: . ... Values of the orbital elements [ output e sin( ), e cos( ), sin(i) sin( ), sin(i) cos( ) ] . Distances between the osculating orbits . ... Choose Second Satellite (for the distances) N9 Halimede N10 Psamathe N11 Sao N12 Laomedeia N13 Neso . ... Enter initial date (years) . Enter final date (years) . ... inclination deg. pericenter deg. node deg. Enter upper limit of frequency deg/year . ...

Planetary Formation is though to occur via an accretion process in a disk of gas and dust that settles into orbit about the host star. ... The identification of dusty disks around young stars would constitute excellent evidence that this process is common and that planetary formation is a natural consequence of star formation. ... This discovery, courtest of Dr. C. O'Dell at Rice University, is consistent with previous discoveries of dusty disks around nearby stars. ...