DsoNode2

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Quick Start Guide

Object Selection

The application supports two approaches to object selection. The easier way is to turn on the Star Chart [node5.html#star_chart_layers object layers] (NgcIc/SAC, PGC) and

  • either [node5.html#range set limiting magnitude] for each layer and field of view (FOV). All objects whose magnitude is below limiting will then be shown on Star Chart. Besides limiting magnitude you could also filter NgcIc/SAC layer by object types.
  • or use [node5.html#visibility_filter_object_layer visibility filter for object layers] to show only objects visible in your telescope

The second approach is to look through several databases for objects to be observed using various filters ([node3.html#dso_selection Object Selection] ), prepare [node4.html#observation_lists observation list] and get its objects on [node5.html#sky_chart Star Chart] automatically.

You could use each approach separately or combine them. For separate use turn off object layers and fill the current observation list, or vice versa turn on object layers and clear current observation list.

For combination both turn on object layers and fill the current observation list. To distinguish observation list objects from layer objects you could show labels for the first, but not for the second, and/or dim layer objects.

Star Chart

[node5.html#sky_chart Star Chart] shows stars and objects from the selected layers and ALL objects from the current observation list. For each FOV and layer you could [node5.html#range adjust limiting magnitude] to raise/diminish the number of stars/objects that you see on the screen[#foot135 2].

Star Chart is highly customisable, there are many options in [node5.html#star_chart_settings Star Chart Settings] that help you adjust it to your needs.

By default, Star Chart depicts preinstalled Digitized Sky Survey (DSS) images and their contours. They are not objects in a usual sense, rather consider them belonging to DSS image layer. To download DSS image of any object/sky portion select an object or a star and go to [node5.html#download_dss Menu/DSS]. Remove DSS image or download image of adjacent area with two long touches on existing image/adjacent area.

Object Selection

To search for objects go to [node3.html#dso_selection Object Selection] screen. Press Select button. Select object catalogs, set Primary as search type and configure [node10.html#basic_search Primary search] (e.g. set object types, minimum dimension, visibility or magnitude limit, minimum altitude).

Also select your geographic location, observation time range and sky conditions. Return back and press Update button. Here you are with a list of objects. Sort them by name, constellation, type, magnitude or dimension.

Press on the object to see its location on Star Chart. Mark objects you want to add to observation list[#foot156 3], long tap on the list and select Add marked to observation list to add object(s) to the current observation list (and they become visible on Star Chart).

Observations Lists

There are four observation lists. The current one is displayed in [node4.html#observation_lists Observations Lists] screen, its objects are shown on Star Chart. Change the current observation list in Menu.

Download DSS images for all objects in the current observation list via [node4.html#obs_dss Menu/DSS] to see them on the Star Chart. Menu provides for other observation list operations (sorting, note matching, etc.) as well.

Examples

Bright objects to observe today

You need to set up search parameters only the first time. After that you may keep them or update only the necessary ones.

  • Star Chart/Menu/Settings/Star, object and image layers. Turn off NgcIc/SAC, and PGC layers
  • Object Selection/Select. You come to Select Conditions screen
    • Select object catalogs. Messier, Caldwell, Herschel 400
    • Select search type. Primary
    • Select Object types. Select types of objects you wish to observe
    • Primary search parameters/Filter type. No filter
    • Time of Observation. Set up observation period, e.g. Begin Time - Astro Twilight Ends, End Time - Astro Twilight Begins
    • Geographic Location. Enable AutoLocation (if not already enabled).
  • Object Selection/Update
  • Object Selection/Context menu (long press)/Add ALL to Observation List. These objects are now shown on Star Chart

Bright Comets to observe today

  • Settings/Object Databases/Comets/Update. This updates orbital elements of Comets database and adds newly discovered comets (if not updated yet by auto updater)
  • Object Selection/Select. You come to Select Conditions screen
    • Select object catalogs. Comets
    • Select object types. Comet
    • Primary search parameters/Object minimal size. 0
    • Primary search parameters/Filter type. Maximum magnitude filter
    • Primary search parameters/Set maximum magnitude. 12
  • Object Selection/Update

Alternatively, you could choose No filter as a Filter type to get all comets above horizon and then sort the resulting list by magnitude.

All visible galaxies with dimension above 10 min

  • Object Selection/Select. You come to Select Conditions screen
    • Select object catalogs. NgcIc, UGC
    • Select search type. SQL-like expression
    • SQL-like expression. Add new search request
  • Object Selection/Update



Footnotes

... screen[node2.html#tex2html2 2]
The limiting magnitude in Range has no influence on how objects from current observation list are shown
... list[node2.html#tex2html3 3]
Turn on checkboxes in Menu first