DsoNode5

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Star Chart

Figure 3: Star Chart screen (bright theme / night mode)
Image skyview1      Image skyview2      Image skyviewred      Image skyviewred1      Image skyview3      Image skyview4      Image skyview5      Image skyview6

Star Chart (Figure [#fig:sky_chart_screen 3]) shows stars and objects from selected layers and ALL objects from the current observation list. You could demonstrate either all objects from the current observation list, or [#hide_objects non-marked ones only].

Besides stars the chart depicts bright star and object labels, bright planets, alt-azimuthal or equatorial grid line, horizon line, user horizon line, constellations, selected eyepieces field of view (red dotted circles), Telrad rings, selected object marker, downloaded DSS images and their contours[#foot407 6].

At the bottom there is a control and information zone. It shows the name of the currently selected object along with its magnitude, azimuth and altitude coordinates as well as chart time and ra/dec coordinates of the chart center. Press at the buttons in the zone center to change field of view (90, 60, 45, 30, 20, 10, 5, 2, 1, 30', 15', 7.2', 3.6' degrees). Press on the name of currently selected object to get [node7.html#details_screen object information]. Press on the chart time to set a new date/time, and/or turn on/off real time mode.

By default double star info (component and separation) is shown as double star label. This could be turned off in [#double_star_info Settings, Double Star Info].

To distinguish observation list objects from layer objects you could (a) show labels for the first, and not for the second, (b) dim object from layers and (c) put a colon (:) after the name of selected object as shown in control and information zone.

Layer objects could be limited either by their magnitude or visibility in selected equipment in the current sky conditions. With the latter option you could see objects visible in your telescope just as you swipe star chart!

You could measure angular distance between any star / objects. Just tap on the first star / object, and then on the second star / object. The measured distance is shown in the upper left.

Main features

Depending on the current field of view (FOV) the program shows:

  • [node1.html#pre_installed_databases Star Layers].
    • Yale Bright Star catalog for all FOV
    • Tycho-2 layer for all FOV. There is a ceiling for limiting magnitude above 10 degrees FOV (to avoid showing too many stars)
    • UCAC4 layer for FOV below or equal to 5 degrees
    • Limiting magnitude for each FOV and layer could be set in [#range Menu/Layers]
  • [node1.html#pre_installed_databases Object Layers].
    • PGC layer for FOV below or equal 30 degrees
    • NgcIc/SAC layer for all FOV
    • Limiting magnitude for each FOV and layer and object types for NgcIc/SAC layer could be set in [#range Menu/Range]
  • The program automatically changes the way it depicts objects (from an object icon to an ellipse / rectangle with real dimensions and orientation)
  • The program starts showing downloaded DSS images below specified FOV [#max_zoom_dss (Max FOV to show DSS)]. The program comes with preinstalled DSS images of the brightest objects. You could download any other [#download_dss DSS images] as you need
  • If available the program shows nebula contours instead of rectangle

Object icons

  • ellipse: galaxy
  • rectangle: bright nebula, dark nebula, HII region, super nova remnant
  • triangle: planetary nebula
  • circle: cluster of galaxies
  • dashed circle: open cluster, open cluster and nebula
  • circle with a cross: globular cluster
  • filled circle with a horizontal crossing line: double star
  • filled circle with a horizontal tail (3 short lines): comet
  • circle with a horizontal line: minor planet
  • five angle star: observation list star, asterism
  • small cross: object from a user catalog with a [node15.html#custom_type user type], quasar

The chart also depicts icons of bright solar system objects: Sun, Moon, Venus, Mars, Jupiter, Saturn.

Star Chart gestures

  • Finger movement. Move the Star chart
  • Pinch-to-zoom gesture. Increase/diminish field of view
  • Long touch. Show/hide control/information zone
  • Long touch on DSS image. Select DSS image
  • Long touch on selected DSS image. Show DSS image menu
  • Long touch near selected DSS image. Select an area adjacent to DSS image
  • Long touch on selected area near DSS image. Show DSS image menu. This is convenient to download several adjacent DSS images covering large objects
  • Touch on star/object. Select a star/object. Put a marker on it
  • Flick up/down on the left screen side. Raise/diminish screen brightness provided that the [#bightness_flick relevant setting] is set

Menu

  • Center. Center selected object
  • -1 hour. Move time one hour back
  • 1 hour. Move time one hour forward
  • Mirror. Show mirror view of the sky
  • Rotate (180). Rotate sky view by 180 degrees
  • Telrad. Show/Hide Telrad
  • Eyepieces. Eyepieces database. Show/Hide eyepieces FOV
  • Nearby. Search for nearby objects from selected catalogs within the specified field of view with the [node15.html#object_vis visibility] above or equal to the specified detection limit
  • DSS.
    • download a single DSS image (for small objects). The center of image coincides with current object marker position
    • download nine DSS images (for larger objects)
    • show/hide DSS images on star chart
  • Scope go. GoTo for Meade and Celestron controllers with [node15.html#bluetooth_go_to bluetooth dongle]
  • Compass. Turn on/off identifying stars and planets by holding the phone next to them. For Android devices with compass. You could choose among three compass modes
    • Compass. Tracks device center movement and adjusts star chart accordingly. Star chart is not adjusted for device rotation around the line perpendicular to device plane
    • Compass Level. Tracks device center movement and its rotation
    • Level. Tracks device rotation around the line perpendicular to device plane. Star chart is not adjusted for device center movement To look for specific object make sure that [#direction_line direction line] is turned on, select this object with object marker, turn either Compass or Compass Level mode and follow direction line from the center of the screen which will bring you to the object
  • Align star. [node15.html#push_to PushTo] for dobsonian mounts with setting circles
  • RA/Dec. Set the screen center at the specified RA/Dec (Epoch 2000) and mark it position with a special marker
  • Boldness. Set star sizes
  • Layers. Set limiting magnitude for each FOV and star/object layer. Set object types for NgcIc/SAC layer
  • Search. [node15.html#global_search Global Search] of an input string in all databases
  • Settings. Additional Star Chart Settings


Star Chart Settings

Figure 4: Star Chart Settings screen (bright / dark theme)
Image skyviewsettings      Image skyviewsettings2

See (Figure [#fig:sky_chart_options 4]).

  • Night mode (on/off) - switching between day/night mode
  • Star Chart
    • Object Marker
      • Enable Object Marker. Show/Hide object marker
      • Settings. Fine settings (orientation marks, direction line[#foot551 7], cross size, line width).
    • Star Chart elements
      • Grid. Select grid type (Azimuthal, Equatorial, No grid)
      • Constellations lines. Show/Hide constellation lines
      • Horizon line. Show/Hide horizon line
      • Fill area below horizon. If selected the area below horizon is filled with horizon color
      • Smooth hard line edges. Anti-aliasing. May lower performance
    • Labels
      • Bright star labels. Show/Hide bright star labels
      • Object labels (Obs List). Show/Hide labels for objects from observation list. This option could be used to distinguish observation list objects from star chart layer objects
      • Double Star Info. Show component and separation on the star chart for double stars from Yale Bright Star Catalog
      • Object labels (Layers). Show/Hide labels for objects from star chart layers. This option could be used to distinguish observation list objects from star chart layer objects
      • Grid labels. Show/Hide grid labels
      • Other labels. Show/Hide other labels (zenith, nadir, horizon labels)
    • Star Chart colors
      • Inverse sky. In day mode black stars are shown on a white background
      • Daytime mode colors. Set star chart elements color (objects, cross-hair, eyepiece FOV, telrad rings, etc)
    • User Horizon
      • Enable User Horizon. Show/Hide user horizon
      • Settings
        • File name with key points. Select a text file containing [node15.html#uhor_text_format user horizon data]. If a file is already selected the program will suggest to update horizon from existing file. This is convenient when you update the text file on the fly and want to update your horizon in program as well
        • Line width. Horizon width in pixels
        • Subdivision size in degrees. Additional points are added between original distant points to draw a smoother line. Subdivision size is an azimuthal distance between these additional points. Larger number makes line coarse, small - affect performance
        • Fill area below horizon. If selected the area below user horizon is filled with horizon color
  • Equipment
    • Telescope.
      • Telescopes Database. Select an [node11.html#telescope_list instrument] for observations
      • Show adjusted Az/Alt. Enable to see adjusted az/alt for dobsonian mount with setting circles ([node15.html#push_to PushTo])
      • [node15.html#bluetooth_go_to GoTo mount settings.]
    • Eyepieces overlay.
      • Eyepieces Database. Select [node11.html#eye_list eyepieces] for observations
      • Nested FOV rings. Show/Hide eyepieces overlay
      • Cardinal direction labels. North, South, East, West labels around eyepiece ring
      • Guide lines. RA/Dec guide lines within eyepiece FOV
    • Telrad overlay.
      • Telrad rings. Show/Hide telrad overlay
      • Settings. Fine settings (ring diameters, marks angle, ring width)
    • Level and Compass.
      • Disable down tracking. Turn off tracking when pointing down
      • Alpha. New point weight. The lower the alpha the smoother the compass, but the slower its speed. Higher alpha raises compass speed, but introduces noise and jitter
  • Star, object and image layers
    • [node1.html#pre_installed_databases Star Layers].
      • Tycho-2 layer. Show/Hide stars from Tycho-2 catalog
      • UCAC4 layer. Show/Hide stars from UCAC4 catalog
    • [node1.html#pre_installed_databases Object Layers].
      • PGC layer. Show/Hide galaxies from PGC catalog
      • NgcIc/SAC layer. Show/Hide deep sky objects from NgcIc, SAC and HCG catalogs
      • NgcIc/SAC object types. Select object types to be shown for NgcIc/SAC catalog
    • [node15.html#object_vis Visibility Filter for Object Layers]
      • Use visibility for layers. Objects in Object Layers are set to obey the Visibility Filter rules instead of the hard magnitude limit
      • Detection limit. Only objects with visibility above or equal to detection limit are shown
      • Sky limiting magnitude. The magnitude of faintest stars at zenith. Used for visibility calculations
    • Options
      • DSO
        • Show near to real DSO shape. Show elliptical shape at high zoom level
        • Zoom level for real size ON. FOV ceiling for showing DSO real shape. For FOV above the ceiling DSO icon is shown, for FOV below the ceiling real shape is shown taking into account Scale factor for real DSO shape (see below)
        • Scale factor for real DSO shape. DSO is shown in real shape if its screen dimension is higher than that of DSO icon multiplied by scale factor. Set it to zero to show any (even the smallest) object in real size
        • Scale factor for DSO signs. Set scale factor for reducing/enlarging DSO icons
      • DSS (Digitized Sky Survey)
        • Enable DSS imagery support. Show/Hide downloaded DSS images on star chart
        • Display DSS contours. Show/Hide DSS contours
        • Max FOV to show DSS. Threshold FOV for showing/hiding downloaded DSS images
        • DSS images dimmer. Dimmer downloaded DSS images in night mode
  • Other
    • Real Time
      • Realtime mode. Enable/disable realtime mode where time and star chart are updated automatically
      • Auto update period. Set the period for auto updating in real time mode
      • Real time screen update dialog
        • Update screen for all FOVs. In realtime mode screen is updated irrespective of magnification
        • Do not update screen for FOVs less or equal. Screen is not updated for FOV less or equal the threshold set (this may be convenient when looking for objects at high magnification)
        • Update screen and auto center selected object for FOV less or equal. If enabled the selected object is auto centred in realtime mode for FOV less or equal the threshold set (this may be convenient to trace objects at high magnification)
      • FOV threshold. The threshold for the above dialog
    • Distinguishing observation list objects
      • Observation list object mark. A colon '':'' is put after the name of selected observation list object
      • Dim objects from layers. Observation list objects are highlighted relative to objects from layers
      • Object labels (Obs List). Show/Hide labels for objects from observation lists. This option could be used to distinguish observation list objects from star chart layer objects
      • Object labels (Layers). Show/Hide labels for objects from star chart layers. This option could be used to distinguish observation list objects from star chart layer objects
    • Miscellaneous
      • Angular measurement. Measure angle between two successive objects selected
      • Center Object. If enabled object is centred on double touch or on getting info in control and information zone
      • Hide marked objects. Hide marked objects from the current observation list on star chart
      • Brightness Flick. Use flick on the left side of the Star Chart to control brightness
      • Battery level warning. Set a minimum level to show a reminder that a charge is required



Footnotes

... contours[node5.html#tex2html9 6]
they are needed to see where DSS images are at high FOV
... line[node5.html#tex2html11 7]
a line from screen center to the selected object