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Topic: Orbital velocity vector

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	A Correction to a Famous Equation
		The radius of the circle is obviously not a velocity; it is a distance.
		Neither the orbital velocity nor the tangential velocity (nor the vector ∆v) change in magnitude over any interval, so calculating any change in any v, or an a that was a change in v, would only give us the number 0.
		The orbital "velocity" is a complex motion made up of the tangential velocity and the centripetal acceleration.
	www.wbabin.net /mathis/mathis.htm (4808 words)

	Orbital inclination change - Wikipedia, the free encyclopedia
		Orbital inclination change is an orbital maneuver aimed at changing the inclination of an orbiting body's orbit.
		An important subtlety of performing an inclination change is that Keplerian orbital inclination is defined by the angle between ecliptic North and the vector normal to the orbit plane, (i.e.
		For more complicated maneuvers which may involve a combination of change in inclination and orbital radius, the amount of delta v is the vector difference between the velocity vectors of the initial orbit and the desired orbit at the transfer point.
	en.wikipedia.org /wiki/Orbital_inclination_change (377 words)

	Orbital Mechanics
		Inclination is the angular distance between a satellite's orbital plane and the equator of its primary (or the ecliptic plane in the case of heliocentric, or sun centered, orbits).
		V to be perpendicular to the orbital plane and, therefore, perpendicular to the initial velocity vector.
		Orbital transfer becomes more complicated when the object is to rendezvous with or intercept another object in space: both the interceptor and the target must arrive at the rendezvous point at the same time.
	www.braeunig.us /space/orbmech.htm (6414 words)

	Chapter 5 -- Orbital Mechanics (Site not responding. Last check: 2007-10-14)
		Orbital mechanics is the study of the motion of human made objects as they travel around a principal body, in the majority of flights the Earth.
		The spacecraft's velocity is a vector tangent to the satellite's path with a magnitude equal to the spacecraft's speed.
		The angle between the local horizontal and the velocity vector is the flight path angle.
	www.space.edu /projects/book/chapter5.html (5633 words)

	Chapter 5: DOPPLER TOMOGRAPHY OF KU CYGNI
		Figure 5.1 displays the different observing angles through the orbital plane of a binary system during one orbit around the center of mass.
		The velocity field of the accretion disk is not necessarily Keplerian in nature.
		Thus, in the rotating reference frame of the system, the observed velocity component at a certain position on the circular orbit around the primary star is given by the total of its Keplerian velocity and orbital velocity, or
	mintaka.sdsu.edu /faculty/quyen/node23.html (1254 words)

	The Orbital Recovery Group (Site not responding. Last check: 2007-10-14)
		The Orbital Recovery Group has a worldwide commercial license for this software as well as for the robotic hardware payload that uses some of the same heritage hardware as is in use in space today on the ROKVISS robot on ISS.
		The Orbital Recovery Group pricing structure entirely depends on the customer and its spacecraft, as the cost of life extension is somewhat proportional to the mass of the target spacecraft.
		The E/W thrusting can occur in a plane perpendicular to the orbital velocity vector since orbital altitude (which is what an E/W maneuver is changing) can be described in energy terms (potential vs. kinetic Hamiltonian math transfers), rather than having to thrust into or against the velocity vector.
	www.orbitalrecovery.com /faq.htm (1808 words)

	Random Works of the Web » Blog Archive » Specific orbital energy (Site not responding. Last check: 2007-10-14)
		In this case the specific orbital energy is also referred to as characteristic energy (or) and is equal to the excess specific energy compared to that for an escape orbit (parabolic orbit).
		It is related to the hyperbolic excess velocity (the orbital velocity at infinity) by
		Thus, if orbital position vector () and orbital velocity vector () are known at one position, and is known, then the energy can be computed and from that, for any other position, the orbital speed.
	random.dragonslife.org /specific-orbital-energy/1443 (871 words)

	[No title]
		The angle between the LOS and the velocity vector, at the mid-point of an 8 minute exposure is 0, 50, and 100 degrees for the 1st, 2nd, and 3rd exposures respectively, in an orbit.
		File Generation: the file data will be constructed from the epehemeris the HST velocity vector as a function of time and the time of earth shadow entry as a function of day in the year.
		Considerations of orbital geometry relative to the positions of the sun, moon, ecliptic plane and galactic plane and even the selection of an intrinsically dark portion of the sky as a target will all be required to insure meaningful measurements of the S/C glow.
	ecf.hq.eso.org /poa/FOS/props/2141c.pro (1626 words)

	A Correction to the Equation a=v²/r by Miles Mathis
		The tangential velocity and the orbital velocity are not the same thing—although by Newton's Lemma VII they have been taken for the same thing throughout history.
		The tangential velocity is the tangent and the orbital velocity is the arc.
		A shorter velocity vector in that case is not a different velocity; it is the same velocity measured over a shorter time.
	geocities.com /mileswmathis/avr.html (7591 words)

	Orbital state vectors - Wikipedia, the free encyclopedia
		Orbital velocity vector together with orbital position vector describe uniquely state of the orbiting body and thus are called
		Orbital state vectors are equivalent to orbital elements (Keplerian elements) and each can be computed with each other (and used to derive other parameters of the orbit).
		A time-independent state vector can be combined with the launch time using xxx method in order to arrive at a valid set of orbital elements whereas computed in advance orbital elements are valid only when launch occurs without the slip.
	en.wikipedia.org /wiki/Orbital_state_vectors (368 words)

	Velocity Corrections in CALFUSE
		The orbital circumstances associated with a typical FUSE observation are illustrated schematically in Figure 4, which represents a projection of the orbital plane onto the equatorial plane of the sky.
		Thus, to remove orbital motion from FUSE data, the spectra must be redshifted by the component of the satellite's velocity whenever it is moving toward the source (i.e., times 1-3), and blueshifted whenever it is moving away from the source (i.e., times 3-5).
		The sense of the heliocentric velocity shift is of prime importance.
	fuse.pha.jhu.edu /analysis/velcor/fusevhelio.html (2893 words)

	Characteristics of the Soyuz attitude control system
		The orbital orientation mode is perforemd using the ionic and infrared sensors.
		The infrared sensor is used to orient the -Y axis to the nadir vector.
		The transfer to the inertial orientation mode is made from the orbital orientation mode.
	www.svengrahn.pp.se /histind/Soyuz1Land/SoyAtti.htm (899 words)

	Method and apparatus for deploying a satellite network - Patent 5199672
		The method of claim 25 wherein the stack is caused to rotate about a roll axis and the inclination of the initial orbit plane is such that the roll axis and velocity vector of the stack remain substantially in alignment at apogee as the initial orbit plane precesses.
		The method of claim 25 wherein each pallet is caused to rotate about a roll axis and the roll axis and velocity vector of the pallet are caused to be in alignment at apogee prior to circularizing the orbit of the pallet.
		In a similar fashion, apsides precession is characterized as a time-rate-of-change of the Keplerian orbital element called, for Earth orbiting satellites, Argument of Perigee (.omega.), which is the angle, in the satellite's orbit plane, between the ascending node N and the perigee point P, measured in the direction of the satellite's motion.
	www.freepatentsonline.com /5199672.html (6958 words)

	High Velocity - Information (Site not responding. Last check: 2007-10-14)
		terminal velocity of an terminal of a terminal velocity of the terminal is because terminal than small terminal is described terminal : m terminal decreases 1 terminal while continuing terminal velocity.
		External links Terminal, from wind The second the of the phase Another consequence phase of a the at which group of the group vg is group velocity vg is the at which group can be signal of the group velocity to exceed group essentially becomes signal of the particle v.
		Velocity Under standard orbital velocity v, escape for that escape with respect This v, orbital of a orbital of a orbital of orbiting orbital vector velocity vector of orbital vector of orbital vector velocity vector s.
	www.freewebs.com /information24/high-velocity.html (321 words)

	Orbital State Vector Information
		The Vectors are in the Earth-Centered Inertial (ECI), Mean of 1950 (M50) Coordinate frame in units of meters and meters/sec.
		The Vectors are in the Earth-Centered Inertial (ECI), Mean of 1950 (M50) Coordinate frame in units of ft and ft/sec.
		The Vectors are in the Earth-Fixed Greenwich (EFG) Coordinate frame in units of ft and ft/sec.
	www.amsat.org /amsat/sarex/vectors.html (687 words)

	Orbital Velocity, Energies (Site not responding. Last check: 2007-10-14)
		Today's quiz problem was to determine what velocity of a circular orbit would be consistent with a centripetal acceleration equal to the gravitational force at a distance of 500 kilometers above the earth.
		Since average acceleration is defined as `dv / `dt, it is clear that since the two velocities are represented by different vectors, there is a nonzero difference `dv and therefore a nonzero average acceleration between the two clock times.
		This is consistent with our experience that when we move in a circular path, something must exert a force to keep us in that path (e.g., the door against which we might be leaning as some fool drives the car in which we are riding almost too fast around a curve).
	www.vhcc.edu /ph1fall9/lectures/ph_981102_981113/ph1_1104/class_notes.htm (869 words)

	Astrodynamic Functions
		AVVS is an optional set of angular velocity vectors to be used to determine the rotation axis and rate of the body.
		AVVS is an set of angular velocity vectors to be used to determine the rotation axis of the body and RATES gives the rotation rate.
		EPHVEL(TSEC,IB1,IB2) is the Cartesian velocity* vector of body IB1 with respect to body IB2 on a date TSEC seconds after 12:00:00 1 January 2000.
	roger.ecn.purdue.edu /~masl/documents/quick/quick.current/quick.astrodynamic.html (6783 words)

	Clock Behavior and the Search for an Underlying Mechanism for Relativistic Phenomena (Site not responding. Last check: 2007-10-14)
		While the velocity effect and the gravitational potential effect are explained by two separate theories, the equal magnitude of the effect defies coincidence and we need to look for an underlying mechanism at work.
		Since clock effects are a function of velocity squared (kinetic energy) and gravitational potential energy, it would seem that the common factor is related to the energy of the particle.
		This motion included the earth’s spin, the earth’s orbital velocity, and even the motion of the earth caused by its orbit around the earth-moon center of gravity.
	www.egtphysics.net /Mechanism/ClockRel.htm (5733 words)

	Global Floods/Pole Shifts - single post for printer
		The combinations, and movements, of these masses with gravitational, centrifugal and orbital velocity vector forces, create what we call the equatorial bulge, and thus, the axis of figure.
		The equatorial bulge, the rotation axis' angle of inclination to the ecliptic plane, the gravitational tidal forces of the Sun, Moon and planets, have an affect on the Earths' orbit that produces the famous precession of the equinoxes.
		Axial Tilt: the ecliptic is the plane of the Earth's ellipsoidal orbital path around the sun; the rotation axis is currently inclined to the ecliptic by an angle of 23.5 degrees: this is called the obliquity, or tilt, of the axis.
	www.abovetopsecret.com /forum/single.php?post=23676 (607 words)

	NSSDC Master Catalog Display: Spacecraft
		The meteorological instruments, a magnetometer, 465-MHz radio antennas, and orbital control devices were housed in a hermetically sealed cylinder located on the earthward-facing end of the cylindrical satellite body.
		The satellite was triaxially stabilized by a series of inertial flywheels, driven by electric motors, whose kinetic energy was dampened by torques produced by electromagnets interacting with the earth's magnetic field.
		Cosmos 156 was oriented by earth sensors with one of its axes directed earthward along the local vertical, a second oriented along the orbital velocity vector, and a third oriented perpendicular to the orbital plane.
	nssdc.gsfc.nasa.gov /database/MasterCatalog?sc=1967-039A (387 words)

	Orbital Parameters (Site not responding. Last check: 2007-10-14)
		The parameters shown are radius (R), velocity (V), and inclination (I).
		You would need a state vector for that.
		These are just a few examples of how orbital parameters are used to define the "look" of an orbit.
	liftoff.msfc.nasa.gov /academy/rocket_sci/orbmech/orbit/orbit.html (168 words)

	NOAA KLM USER'S GUIDE Section 3.3
		The polarization angle is defined as the magnitude of the angle between the electric field vector of the incoming radiation and a line which is the intersection of a plane perpendicular to the propagation direction of the incoming radiation and a plane tangent to the earth surface.
		Vertical polarization is defined as having the polarized vector in the sun-nadir plane when the beam is pointing at nadir.
		The sense of the scan is counter clockwise as one looks along the spacecraft orbital velocity direction, namely, the antenna scans from the sun direction through nadir to the cold space direction.
	www2.ncdc.noaa.gov /docs/klm/html/c3/sec3-3.htm (1504 words)

	Help: Atomic oxygen erosion
		This fluence in turn is dependent on many parameters such as attitude of the surface relative to the orbital velocity vector, altitude, solar activity, and life span of the spacecraft.
		The orientation of the impacted surface is defined in terms of the attitude vector specified for the orbit generator.
		The velocity v of a particle is the sum of its aerodynamical velocity v
	www.spenvis.oma.be /spenvis/help/background/atmosphere/erosion.html (1923 words)

	[No title] (Site not responding. Last check: 2007-10-14)
		As of August 12, 1993 the Compton GRO mean orbital altitude was 349.11 km.
		After performing a reaction-wheel attitude maneuver earlier in the day to align the thrust vector with the orbital velocity vector, the solar arrays were placed in the indexed position (facing the +X direction), and the thruster burns were performed close to orbit noon.
		These were done to align the velocity and thrust vectors in preparation for the OATS test burn that day, and then to return to the new science attitude for viewing period 301.
	lheawww.gsfc.nasa.gov /docs/gamcosray/legr/bacodine/gro/gro.133 (774 words)

	The DISCOS Drag-Free Satellite
		TRIAD II was similar to TRIAD I with the very important exception that it was a single-axis DFS with the Drag-Free axis parallel to the orbital velocity vector.
		Since the atmospheric drag is also parallel to the velocity vector, a single-axis DFS can cancel most of the disturbing forces acting on the satellite.
		The cylinder was free, however, to slide along the wire in the axis parallel to the orbit velocity vector.
	www.dragfreesatellite.com /discos.html (1159 words)

	Surrey Space Centre
		The eccentricity of the orbit also needs to be small as otherwise the altitudes at which the satellite passes over a given location along its ground track will vary and this will need to be compensated for when comparing imagery.
		The orbital manoeuvre of UoSat-12 was performed entirely autonomously using an onboard GPS receiver for navigation.
		The onboard computer estimates the current orbital parameters of the satellite using the analytic epicycle model and then adjusts them in a feedback loop to bring the altitude into resonance.
	www.ee.surrey.ac.uk /SSC/G7/P5 (698 words)

	Untitled
		The orbital retrieval mission uses methods very similar to the fully automated sample return mission but the heat shielding is deleted and the sample containment unit is greatly simplified because the core sealing requirements are less stringent.
		The main retro-propulsion system's only function is to deorbit the lander by applying a delta V in the direction opposite to its orbital velocity vector.
		In the touch down sequence the vernier rockets will be responsible for controlling the descent velocity, but it will be the attitude control motors which will stabilize the lander and keep it vertical when (and if) its legs touch down on a rough, or non-level, site.
	www.tsgc.utexas.edu /archive/design/polar (17898 words)

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