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# Topic: Argument of periapsis

###### In the News (Thu 25 Apr 19)

 Orbit - Printer-friendly - MSN Encarta The size of the orbit is given by the periapsis distance (SP) and the elongation of the orbit is given by the eccentricity (e). The three orbital elements that describe an orbit's orientation are the inclination (i), the longitude of the ascending node (Ω), and the argument of the periapsis (ω). The argument of the periapsis is the angular displacement in the plane of the orbit between the ascending node and the line that passes through the centre of the orbit (C) and the periapsis (P). uk.encarta.msn.com /text_761556131___3/Orbit.html   (321 words)

 Argument of periapsis - Medbib.com, the modern encyclopedia The argument of periapsis (ω) is the orbital element describing the angle between an orbiting body's ascending node (the point where the body crosses the plane of reference from South to North) and its periapsis (the point of closest approach to the central body), measured in the orbital plane and in the direction of motion. An argument of periapsis of 0° means that the orbiting body will be at its closest approach to the central body at the same moment that it crosses the plane of reference from South to North. An argument of periapsis of 90° means that the orbiting body will reach periapsis at its northmost distance from the plane of reference. www.medbib.com /Argument_of_Perihelion   (230 words)

 Final Gallery Periapsis is the point in an orbit closest to the primary. Periapsis and apoapsis names are modified to apply to the body being discussed such as perilune and apolune for the moon or perihelion and aphelion for the sun. The argument of periapsis is the angular distance between the ascending node and the point of periapsis. aerospacescholars.jsc.nasa.gov /has/Students/finalGall.cfm?id=132   (705 words)

 Argument of the perihelion - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-16) The argument of the perihelion is one of the orbital elements describing a body in a Sun-centered orbit (e.g., a planet). It is the angle between the ascending node and the perihelion, measured in the orbital plane. An argument of perihelion of 0° means that the body will be at perihelion right when it crosses the ecliptic from South to North. www.godseye.com /stat/en/a/r/g/Argument_of_the_perihelion.html   (161 words)

 Basics of Space Flight Section I. The Environment of Space Argument of periapsis is the argument (angular distance) of the periapsis from the ascending node. Each periapsis pass, a swath of mapping data was taken, and the planet rotated so that swaths from consecutive orbits were adjacent to each other. A walking orbit whose parameters are chosen such that the orbital plane precesses with nearly the same period as the planet's solar orbit period is called a sun synchronous orbit. www2.jpl.nasa.gov /basics/bsf5-1.html   (1166 words)

 Planetary Orbits   (Site not responding. Last check: 2007-10-16) The terms orbit period, periapsis, apoapsis, etc., were introduced at the end of Chapter 3. The argument of periapsis (4) is the argument (angular distance) of periapsis from the ascending node. Time of periapsis passage (5) and the celestial longitude of the ascending node (6) are the remaining elements. www.au.af.mil /au/awc/awcgate/jplbasic/bsf5-1.htm   (1003 words)

 Orbit (astronomy and physics) - MSN Encarta Early in the 17th century, the German astronomer and natural philosopher Johannes Kepler deduced three laws that first described the motions of the planets about the sun: (1) The orbit of a planet around the sun is an ellipse. The argument of the periapsis measures the angular displacement in the plane of the orbit between the ascending node and the line that passes through the center of the orbit (C) and the periapsis (P). This axis is half the long axis (AP) of the ellipse, or half the distance between the points of periapsis (P) and the apoapsis (A). encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761556131   (917 words)

 Practical Astronautics For earth orbits periapsis is known as perigee. , - the angular distance from periapsis to the actual position of the satellite in its orbit. is equal to E and M at periapsis (all equal 0 degrees) and at apoapsis (all equal 180 degrees). www.astronautica.com /astro   (1528 words)

 Untitled Document   (Site not responding. Last check: 2007-10-16) One of the more interesting parameters to track is the argument of periapsis, which can be use to determine the latitude of the point of periapsis passage. The argument of periapsis is measured in degrees from the line of the ascending node on the equatorial plane to the point of periapsis passage. Referring to the History of Orbital Parameters, we see that at the start of aerobraking the argument of periapsis was about 148.44 degrees. mars.jpl.nasa.gov /mgs/status/nav/orbparam.html   (227 words)

 Gravity Calibration The argument of periapsis is under the south pole, the semi-major axis is 0.4 km higher than the target value and the inclination may be 0.05 deg lower than desired. The Nav Team is in the process of achieving a stable orbit in which the argument of periapsis and local mean solar time vary slowly over the duration of the mapping phase. The TMO sequence that will place the argument of periapsis over the South Pole has been approved for transmission to the spacecraft. mars.jpl.nasa.gov /mgs/status/reports/gravcal/gravcal.html   (636 words)

 Argument of periapsis - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-16) In an orbit, the argument of periapsis (ω) is the angle between the ascending node (the point where the orbiting body passes from the southern to the northern hemisphere) and the periapsis (the point of closest approach to the central body), measured in the body's orbital plane and in its direction of motion. It is undefined for equatorial orbits, where there is no defined ascending node, and for circular orbits, where there is no defined periapsis. The argument of periapsis is often called the argument of perihelion for objects orbiting the sun, and the argument of perigee for objects orbiting planets, such as satellites. www.godseye.com /stat/en/a/r/g/Argument_of_periapsis.html   (224 words)

 Final Gallery As a satellite orbits a planet, the point in the orbit at which the satellite is closest to the planet is called the periapsis. The angular distance between the ascending node and the point of periapsis is known as the argument of periapsis. The spacecraft will accelerate to break free of the Earthâs gravity until it has reached an elliptical orbit in which the periapsis is at a point on the Earthâs orbit around the sun and the apoapsis is at a point on Marsâ orbit around the sun. aerospacescholars.jsc.nasa.gov /has/Students/finalGall.cfm?id=1061   (920 words)

 Glossary   (Site not responding. Last check: 2007-10-16) The angle, in the plane of the satellite’s orbit, between the ascending node and the periapsis point, measured in the direction of the satellite’s motion. The angle from the ascending node to the eccentricity vector measured in the direction of the satellite’s motion. For satellites orbiting the earth, the elements are: argument of perigee, semi-major axis, right ascension of the ascending node, epoch, eccentricity, and inclination. www.ai-solutions.com /freeflyerhelp/glossary/glossary.htm   (2432 words)

 Vega Strike Forums :: View topic - Rylix System: Orbital Physics Need Updating   (Site not responding. Last check: 2007-10-16) Argument of Periapsis; Periapsis is the point in the orbit in which the orbiting mass is closest to the primary focus. argument of pericenter the angle from the ascending node to the body in the orbital plane (denoted when measured from any point in the orbital plane). Or, instead of using the time of periapsis of each of the bodies, you could specify a single "system base time" and use the positions and velocities of all the bodies at that time instead. vegastrike.sourceforge.net /forums/viewtopic.php?t=1385   (2987 words)

 Planetary Orbits , the distances of the periapsis and apoapsis are given by and the periapsis measured from the centre and is related to the mean and true anomalies by the set of equations: The perifocal coordinate system has its X-axis from the focus to the periapsis, and its Z-axis right-handed perpendicular to the orbital plane in the sense of orbital motion. www.mps.mpg.de /homes/fraenz/systems/systems2art/node15.html   (468 words)

 [No title]   (Site not responding. Last check: 2007-10-16) The flyby induces a change in direction of the comet’s velocity vector with respect to Earth of 60 deg and its velocity at infinity with respect to the Earth is 2.0 km/sec. In the planet-centric equator and equinox coordinate frame (XYZ), a vector is defined by:  EMBED Equation.3  DU For a ground station located at 30 deg N latitude and 60 deg East of the reference direction (X axis), transform this vector into the topocentric-horizon and South spherical coordinate frame. Object _______ has an argument of periapsis of 200 deg. www.ae.gatech.edu /people/rbraun/classes/spaceflightmechanics05/hw2.doc   (333 words)

 MGS Status The TMO sequence is a Transfer to Mapping Orbit maneuver designed to freeze the argument of periapsis and lock in a sun synchronous orbit. Until recently the Mars-Gram model was scaled by comparing the density at periapsis as predicted by Mars-Gram to the density as determined by navigation data. argument of periapsis moves to the center of the "polar vortex". www.psc.edu /Mars/mgs/status/reports/mgs-AB.html   (5417 words)

 NSO: Glossary of Terms longitude of the ascending node, and the argument of periapsis (together called the Euler angles), determine the orientation of the orbit in space, and the remaining one, for which usually either the The periapsis of an orbit of one object around another is the point at which the one object is closest to the other object. Periapsis is the general term for such a point, but there are also many specific terms for specific cases: the perihelion is the closest point to the Sun in an orbit around the Sun. www.nso.edu /press/glossary.html   (8991 words)

 CSPICE Routines: OSCELT_C 5) If the eccentricity is determined to be zero, the argument of periapse is set to zero. 6) If the eccentricy of the orbit is very close to but not equal to zero, the argument of periapse may not be accurately determined. The argument of periapse and mean anomaly may also be inaccurate. www.gps.caltech.edu /~marsdata/cspice/oscelt_c.html   (824 words)

 [No title] Classical orbital elements: semi-major axis, eccentricity, inclination, node angle, argument of periapsis, and mean anomaly, are an example of such a set, as are the six elements of a cartesian state vector: x, y, z, vx, vy, and vz. A "frozen" orbit is one where J3 acts to cancel the precession of periapsis due to J2. Note also that the regression of the node due to J2 is modeled without regard to whether the orbit is "frozen". roger.ecn.purdue.edu /~masl/documents/xiorb/xiorb.current/xiorb.html   (1273 words)

 Status Report   (Site not responding. Last check: 2007-10-16) The first burn was at apoapsis to lower periapsis from 77.5 km to 50.5 km. The second burn was at the ascending node to set new periapsis altitude to 25 km at desired argument of periapsis. The resulting orbit was 25 km x 55 km. lunar.arc.nasa.gov /printerready/status/1998/12210700.html   (211 words)

 Dr. Dobb's | Orbit Propagation | April 15, 2003   (Site not responding. Last check: 2007-10-16) The point in the orbit when the object most closely approaches the earth is called periapsis or perigee. w = the argument of periapsis, or the angle, measured in the orbit plane, between the X-Y plane and periapsis Hence for a given orbit, if you know the time of periapsis tp, then, in order to find the position and velocity at time t, you 1. www.ddj.com /dept/cpp/184402360?pgno=10   (2782 words)

 [No title]   (Site not responding. Last check: 2007-10-16) When I apply a constrant thrust in prograde mode, the argument of periapsis move! Well, at any time other than periapsis and apoapsis, your orbit has a vertical component with respect to the surface of the body you are orbiting. It is this vertical component which results in the moving of the argument of periapsis--the only way for the argument of periapsis to remain unchanged is if you are oriented exactly perpendicular to the line connecting your vessel with the center of mass of the body you are orbiting. www.orbitersim.com /v2/read.asp?id=21325   (182 words)

 Siglas de la NASA The farthest point in an orbit from the body being orbited. The argument (angular distance) of periapsis from the ascending node. Two-Way Non-Coherent mode, in which a spacecraft's downlink is not based upon a received uplink from DSN. www.upv.es /satelite/trabajos/pracGrupo1/diccion/siglas.htm   (1930 words)

 Help: Glossary An AFS is a sign of emerging bipolar magnetic flux and possibly rapid or continued growth in an active region. The temperature decreases with altitude and shows a local minimum at the tropopause (218 K); The lower regions of a planetary atmosphere where convection keeps the gas mixed. A flare that has developed as a pair of bright strands (ribbons) on both sides of an inversion line of the Solar magnetic field. www.spenvis.oma.be /spenvis/help/system/glossary.html   (16507 words)

 Tools This program calculates the position and velocity vectors in the orbit fixed PQW coordinate system given the orbital elements. This program calculates the position and velocity vectors in the earth centered non-rotating coordinate system given the orbital elements. This program converts the position and velocity vectors from the orbit centered coordinate system, PQW, to the inertially fixed coordinate system, XYZ. www.tsgc.utexas.edu /spacecraft/topex/tool.html   (605 words)

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