NEO Planner V4.5 - Common restrictions - Explanations
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These settings are the fifth step in getting NEO Planner up and running.
Here you define
some common restrictions for the planning process.
These settings are primarily used to define the observable area in all
directions from the location of the observatory, including
self-defined Moon distances.
One should keep an eye on a horizon that is not too far out, even if the
observatory would allow it. A full range from R.A.
12 east and west of the meridian makes it difficult
for the program
to determine the best observation time for all objects,
which is calculated based on the altitude of the nocturnal ephemeris.
So you should generally choose an area that is about 6-10
R.A. hours east or west of the meridian on midnight or more
precisely, of the siderial time.
This range can be increased to a greater extent if one carefully checks the
results of the calculations for correct chronological
order.
Plausibility checks or actions are usually only carried out after leaving the cursor in the input field.
The active observatory is displayed
In contrast to deep sky photographers or observers, the moon is not a real
obstacle for observers from Near Earth Objects.
Nevertheless, observing our companion too closely will lead to some unusable
images. This applies in particular to phases of the moon around
100%.
In this window you have the opportunity to determine the distances between the
objects and the moon according to your own experience.
Neo Planner will then sort out those objects whose positions during the night
come too close to the moon by the degrees entered.
Experience has shown that when the moon is above the horizon, up to 1 mag
lighter objects than usual are selected, depending on the moon phase.
-> look here how to control
the brightness of the objects
RA hours east before Siderial time:
Enter the RA hours which objects should be observed east of sidereal time depending on the nature of the horizon.
RA hours west after Siderial time:
Enter the RA hours which objects should be observed west of sidereal time depending on the nature of the horizon.
Light conditions on/off:
Display of the light
conditions via a list box. At higher latitudes in the hemispheres, reduced data
is shown around the time of the summer solstice and missing astronomical time.
The twilight end and start times in the period between sunset and around
nautical twilight should be adjusted to the seasons.
With this setting you define the
time span between sunset and the start of the observation.
Since the start of the observation
is based on individual experiences and preferences, enter the time span here
yourself.
This can change during the year, depending on the location of the observatory.
For K87 on 50 degree northern latitude, I start the observation according to the
sensitivity of my CCD camera, when nautical dusk is reaching MPSAS ~ 20 mag.
I then adjust the time span in the
course of the year according to the seasons.
Twilight start before sunrise:
With this setting you define the time span between the last observation of the
night and sunrise.
Since the end of the observation is
based on individual experiences and preferences, enter the time span here
yourself.
This can change during the year, depending on the location of the observatory.
For K87 on 50� northern latitude, I end the observation according to the
sensitivity of my CCD camera, when nautical dusk is reaching MPSAS ~ 20 mag.
I then adjust the time span in the
course of the year according to the seasons.
MPSAS - Magnitude per Square Arc Second - explanation
Minimum altitude ALT in degree:
The minimum height above the
horizon depends primarily on experience as to which objects can reasonably be
observed above the horizon with the equipment.
Near Earth Objects in particular
require a high quality survey, so a generous degree value should be preferred.
Neo Planner then selects those objects which reach the specified height when
crossing the meridian.