Difference between revisions of "Orbit MFD"

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(Orbit MFD)
(Orbit MFD mode.)
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'''Orbit''' is an MFD mode which is included in the [[Orbiter|Orbiter Space Flight Simulator]]. This mode displays a graphic representing a central body, the orbit of the pilot's ship, and the orbit of a target body, and also includes orbital parameters and elements of those orbits. The pilot can select Orbit from the MFD mode selection page.
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'''Orbit''' is an MFD mode which lists the elements and parameters for the orbit of the ship's orbit in reference to a central body, and a graphical representation of the orbit. The mode can also show the orbit of a target body orbiting the same body and its orbital characteristics. Orbit may be selected from the MFD selection page.
  
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Orbit MFD displays the osculating orbits at the current epoch (its 2-body orbit) with respect to a celestial body. The orbital parameters may change over time due to perturbations from other gravity sources, nonspherical gravity, atmospheric drag, and thruster action, etc. Any celestial body in the current session can be selected as the reference body.
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The display shows the Keplar, or two-body, orbit of the craft at the current date with respect to the reference body. Any natural body in Orbiter may be selected as the reference body. Because of perturbations to the orbit, it may change over time. Perturbing effects include other bodies in the Solar System, nonspherical gravity, atmospheric drag, and ship's engines, etc.
  
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Orbital elements and graphic display is displayed in one of two frames of reference, '''Ecliptic''' (ECL) or '''Equatorial''' (EQU) by selecting the FRM button or {{Key|Shift}}+{{Key|F}}. The current frame is displayed on the top line of the MFD display near the right corner.
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The orbital elements may be displayed in the ecliptic or equatorial frame of reference. The plane of the ecliptic is the orbital plane of the Earth and the equatorial plane is the plane of the equator of the reference body. {{Key|Shift}}{{Key|F}} or the FRM button is used to switch back and forth between the reference frames, the 'Frm' value displays the current frame.
  
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Any celestial body may be selected as the reference body by selecting the REF button or {{Key|Shift}}+{{Key|R}}, displaying a pop-up window where the pilot may select the reference body. Selecting the NT button or {{Key|Shift}}+{{Key|A}} will autoselect the reference body having the highest gravitational influence on the ship.
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The
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The display may project a plane to be projected onto the MFD display by selecting PRJ or {{Key|Shift}}+{{Key|P}}. Four planes may be selected: Ecliptic (ECL), Equatorial (EQU), the focus ship (SHP), or target ship or celestial body (TGT).
 
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Distance from the focus body may be displayed from the center of the body, indicated by Rad, ApR, PeR, or from the altitude of the mean radius of the body, indicated by Alt, ApA, PeA, by selecting the DTS button or {{Key|Shift}}+{{Key|D}}.
 
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The orbit of a target ship or body orbiting the same body as the pilot's ship may be selected with the TGT button or {{Key|Shift}}+{{Key|T}}. The NT button or {{Key|Shift}}+{{Key|N}} turns off the target orbit and data.
 
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Selecting the HUD button or {{Key|Shift}}+{{Key|H}} will set the HUD to Orbit MFD mode and copy the orbit reference object.
 
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{| class="wikitable" style="text-align: center"
 
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|colspan="3"|'''Key Options'''
 
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!MFD button!!Keypress!!Description
 
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|AR||Shift+A||Autoselect the reference body.
 
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|DST||Shift+D||Toggle planetocentric distance or altitude above mean radius
 
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|FRM||Shift+F||Toggle frame of reference<br>(ecliptic or reference object equator)
 
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|HUD||Shift+H||Set HUD to Orbit mode and copy the current MFD orbit reference object
 
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|MOD||Shift+M||Toggle display mode<br>(reference frame, ship's orbital plane, target orbital frame)<br>will show central body with ship's orbit and target orbit if selected; orbital data; both
 
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|NT||Shift+N||No target orbit
 
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|PRJ||Shift+P||Toggle projection mode of orbit<br>(reference frame, ship's orbital plane, target orbital plane
 
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|REF||Shift+R||Select new reference object (celestial object) or orbital data
 
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|TGT||Shift+T||Open popup menu to select a target
 
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|}
 
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{| class="wikitable" style="text-align: center"
 
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|colspan="3"|'''MFD display components'''
 
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!!Parameter!!Nomenclature!!Description
 
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|SMa||Semimajor axis||longest semi-diameter of the orbit<br>Periapsis + Apoapsis
 
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|SMi||Semiminor axis||shortest semi-diameter of the orbit
 
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|PeR<br>PeA||Periapsis Radius<br>Periapsis Altitude||Lowest point of the orbit
 
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|ApR<br>ApA||Apoapsis Radius<br>Apoapsis Altitude||Highest point of the orbit
 
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|Rad<br>Alt||Radius<br>Altitude||Radius from the center of the body<br>Altitude from body mean radius
 
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|Ecc||Eccentricity||Circularity of the orbit (0-1)
 
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|T||Orbit Period||Time in seconds for one orbit
 
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|PeT||Periapsis Time||Time in seconds until the next Periapsis
 
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|ApT||Apoapsis Time||Time in seconds until the next Apospsis
 
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|Vel||Velocity||Velocity of the ship or target in km/sec
 
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|Inc||Inclination||Angle (°) at which orbit deviates from the ecliptic or equator
 
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|LAN||Longitude of the Ascending Node||Angle in degrees (°) of the orbit from the Vernal Equinox
 
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|LPe||Longitude of Periapsis||Angle (°) along the reference plane from the Vernal Equinox to the Periapsis
 
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|AgP||Argument of Periapsis||Angle (°) from the ascending node to the periapsis
 
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|TrA||True Anomaly||Angle (°) from the Periapsis to the ship's or target's location along the orbit
 
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|TrL||True Longitude||Angle (°) of the longitude of the ship's or target's position from the ecliptic
 
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|MnA||Mean Anomaly||Angle (°)
 
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|MnL||Mean Longitude||
 
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|}
 

Revision as of 11:58, 27 September 2023

Orbit is an MFD mode which lists the elements and parameters for the orbit of the ship's orbit in reference to a central body, and a graphical representation of the orbit. The mode can also show the orbit of a target body orbiting the same body and its orbital characteristics. Orbit may be selected from the MFD selection page.

The display shows the Keplar, or two-body, orbit of the craft at the current date with respect to the reference body. Any natural body in Orbiter may be selected as the reference body. Because of perturbations to the orbit, it may change over time. Perturbing effects include other bodies in the Solar System, nonspherical gravity, atmospheric drag, and ship's engines, etc.

The orbital elements may be displayed in the ecliptic or equatorial frame of reference. The plane of the ecliptic is the orbital plane of the Earth and the equatorial plane is the plane of the equator of the reference body. ShiftF or the FRM button is used to switch back and forth between the reference frames, the 'Frm' value displays the current frame.

The

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