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MicroHelp
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1991-03-30
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13KB
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241 lines
MicroHelp Library
A Compendium of Information Required by the
+ Observer of the Belted Planet
(c) L. Abbey, 1990, 1991
+ Version 2.0
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Date: / /
Time: :
Zone:
Diameter:
Rotation Period 9.842 hrs
Equatorial
142,800 km
(Sidereal)
! Polar
134,200 km
Z Density
1.32
Inclination
3.12
\ Escape Velocity 59.6 km/sec
Reciprocal Mass 1,047.355
] Volume (Earths) 1,323
Mass (Grams)
1.899x10^27
] Surface Gravity 2.69
Geometric Albedo
0.52
] Mean Magnitude
-2.3
F1 - Help
F3 - Definitions
Any Other Key to Proceed
DEFINITIONS - 1
BELTS (South)
SEB - South Equatorial Belt. Prominent belt immediately above (South
of) the Equatorial Zone. Often seen separated into North and
South components.
STB - South Temperate Belt. Immediately South of the SEB. The Red
Spot frequently interacts with this belt, especially with the
many white ovals which appear on it's southern edge.
SSTB - South South Temperate Belt. South of the STB. There is little
activity here.
EB - Equatorial Belt. This belt is rarely seen, and is probably
composed of the connected tops of the many loops and festoons
which are found in the Equatorial Zone. This belt, if it is a
belt, is unstable and very elusive.
<Esc> - Exit
Any Key to Proceed
DEFINITIONS
<Esc> - Exit
<CR> or Highlighted Key to Select
DEFINITIONS - 2
BELTS (North)
NEB - North Equatorial Belt. Prominent belt immediately below (North
of) the Equatorial Zone. Often seen separated into North and
South components. It is almost always the most prominent
marking on the planet.
NTB - North Temperate Belt. Immediately North of the NEB. This belt
usually contains many dark knots and light streaks.
NNTB - North North Temperate Belt. North of the NTB. There is little
activity here.
In general, the Northern Hemisphere of the planet is not as active
or interesting as the Southern one.
<Esc> - Exit
PgUp - Previous Screen
Any Key to Proceed
DEFINITIONS - 3
Zones (South)
EZ - Equatorial Zone. The most prominent zone. It spans the middle
of the planet, and contains many delicate features.
STrZ - South Tropical Zone. Prominent zone immediately above (South
of) the South Equatorial Belt. This zone is famous as the home
of the Great Red Spot.
STZ - South Temperate Zone. Immediately South of the STB. Though
this zone is usually placid, the light ovals of the STB
project into it, producing many intricate patterns and
interactions.
SSTZ - South South Temperate Zone. South of the SSTB. There is little
activity here.
<Esc> - Exit
Any Key to Proceed
DEFINITIONS - 4
Zones (North)
EZ - Equatorial Zone. The most prominent zone. It spans the middle
of the planet, and contains many delicate features.
NTrZ - North Tropical Zone. Prominent zone immediately below (North
of) the North Equatorial Belt.
NTZ - North Temperate Zone. Immediately North of the NTB.
NNTZ - North North Temperate Zone. North of the NNTB.
In general, the Northern Hemisphere of the planet is not as active
or interesting as the Southern one.
<Esc> - Exit
PgUp - Previous Screen
Any Key to Proceed
DEFINITIONS - 5
OTHER FEATURES
SPR - South Polar Region. The dark "Polar Cap" of the planet. Very
little observable change occurs here, but occasionally small
light or dark spots appear, especially near the northern edge.
NPR - North Polar Region. Immediately North of the NTB. Similar to
the SPR, but less active.
Limb Darkening is not usually noticed by visual observers, yet
it is an important aspect of the planet's appearance. Limb
darkening appears as a slightly darker crescent-shaped border
to the planet's disk, located on the limb opposite to the Sun.
When prominent enough to be noticed, it gives a "3-D" effect.
<Esc> - Exit
Any Key to Proceed
DEFINITIONS - 6
RED SPOT
RS - The Great Red Spot. Slightly larger than the Earth, the Red
Spot is the planet's most interesting feature. It varies in
intensity from a dark brick red to a pale rose. Occasionally
some structure is visible within the spot. At other times it
disappears for months, or even years. The spot usually appears
as an appendage hanging from the northern edge of the STB.
RSH - The Red Spot Hollow. The hollow is an oval which is slightly
larger than the spot. The spot lies within it, and when the
spot is in it's quiescent phase, only the pale white hollow is
seen. Sometimes the hollow is bordered by a darker swirl of
clouds.
<Esc> - Exit
Any Key to Proceed
HELP - GENERAL
You may customize the program for your time
zone by using a command-line switch. For
instance if you are in time zone 7 invoke the
program as follows:
C> jupe 7
Choose from the menu items by either moving the
cursor with the arrow keys, or by pressing the
highlighted letter for the selection desired.
Any Key to Proceed
HELP - LONGITUDES
There are five images for the simulation of the
Red Spot's predicted location. Each of these
covers a zone 30
wide (plus one blank). The
longitude of the spot is assumed to be 30
(II).
This is a reasonable approximation for the next
several years.
The percent of the disk which is illuminated by
the Sun is shown. Due to Jupiter's phase angle
of up to 12
this can vary between 98.9% and
100%.
Any Key to Proceed
DEFINITIONS - 7
LONGITUDES
Longitude Systems. Two longitude systems are used by visual observers.
System I. This system is used for observations in the equatorial
region of the planet. It extends from the southern edge of the
northern component of the SEB to the northern edge of the southern
component of the NEB. It includes the Equatorial Zone. System I has
a rotation period of 9h 50m 30.003s.
System II. This system is used for the rest of the planet. System II
has a period of 9h 55m 40.632s.
System III. Used for radio sources only.
Central Meridian. The central meridian for any of the two visual
systems is the longitude which passes through the center of the disk.
<Esc> - Exit
Any Key to Proceed
HELP - SATELLITES - 1
The satellite screen initially displays the
configuration of the Galilean Satellites for
the date and time entered. Pressing any key
other than <Esc> or F1 causes the display to
animate the satellite system for the next six
hours, in thirty-minute increments. This should
be sufficient for most observing sessions. The
time and date of the animated display are
shown.
Any Key to Proceed
HELP - SATELLITES - 2
The satellites are shown as black dots whenever
they pass in front of or behind the disk. This
is not to be interpreted as a prediction of
transit or occultation. The program does not
take into account the small inclination of the
plane of the satellite's orbit.
The size of the planet's disk in relation to
the satellite's orbits (and size) is
approximate.
Any Key to Proceed
HELP - SATELLITES - 3
The satellites are identified beneath the
display as follows:
C - Callisto
E - Europa
G - Ganymede
I - Io
Any Key to Proceed
HELP - GENERAL
This program uses the current date and time as
the default for central meridian and satellite
predictions. It is therefore important that the
computer's clock be set before the program is
run.
The times and dates which are entered should be
local. Times should always be entered in the
24-hour system.
Any Key to Proceed
Unable to locate graphics library JUPE.GXL
INTRO
ABBEY
FACTS
DEFINE1$
DEFINE
DEFINE2#
DEFINE3
DEFINE4
DEFINE5
DEFINE6
HELP1y!
HELP2
DEFINE7d&
HELP3#*
HELP4
HELP5@/
HELP1A
NOLIB