Differences

This shows you the differences between two versions of the page.

--- en:documentation:display_of_neos [2022/06/28 11:22] – pch
+++ en:documentation:display_of_neos [2022/06/28 14:14] (current) – [New method since version 4.3] pch
@@ Line 8: / Line 8: @@
 ===== New method since version 4.3 =====
-Since the beta version from February 2021 it is possible to compute the object position directly in the program using a SPICE kernel for the NEO (or other asteroid). This method give the same precision for a perturbed orbit than the one computed by Horizon.
+Since the beta version from February 2021 it is possible to compute the object position directly in the program using a SPICE kernel for the NEO (or other asteroid). Even for a perturbed orbit this method give the same precision than Horizon.\\
+It automate the Horizon Telnet interface to prepare a kernel file and download it by FTP.
+Open Setup -> Solar System, then the tab **SPICE ephemeris**
+The first time you need to enter your email that is required by JPL. Enter the name of the NEO, the first day you want the position, the number of days of the prevision. \\
+Do not enter a too long period here because this can increase the file size a lot, but also because the prevision is continuously updated with new observation that increase it's precision. It is easy to update the file later to extend it's validity.\\
+When ready click **Download**.
+{{:en:documentation:neospice1.png?400|}}
+After the download is complete you see a new entry in the list below.\\
+Be sure to select the object you want to display on the chart.\\
+A mouse right click present a menu to refresh or delete one or all of the ephemeris.\\
+Click **OK** at the bottom of the window.
+{{:en:documentation:neospice2.png?400|}}
+To locate the new object type the name in the search toolbar and press Enter.
+{{:en:documentation:neospice3.png?400|}}
+The display of this object is independent of the asteroid that not need to be selected.\\
+There is also an independent selection available to plot the orbit path.
+{{:en:documentation:neospice4.png?400|}}
+----
 ===== Old method using local catalog =====