Author Topic: Visibility of International Space Station ISS  (Read 17 times)

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Visibility of International Space Station ISS
« on: February 04, 2018, 02:32:51 PM »
Wednesday 7 February
Appears        18h37m50s   2.5mag  az:280.8 W    horizon
Culmination  18h43m10s  -3.8mag  az:196.0 SSW  h:66.1
distance:       444.1km  height above Earth: 408.6km  elevation of Sun: -13
Disappears   18h45m14s  -2.7mag  az:117.5 ESE  h:20.5

Thursday 8 February
Appears       17h45m40s   2.3mag  az:277.6 W    horizon
Culmination  17h51m02s  -3.9mag  az:190.2 S    h:81.2
 distance:     413.2km  height above Earth: 408.7km  elevation of Sun: -5
Disappears   17h55m25s  -1.3mag  az:102.8 ESE  h:4.1

Appears       19h22m09s   2.5mag  az:283.1 WNW  horizon
Culmination  19h27m17s  -2.4mag  az:209.5 SSW  h:30.2
 distance:     750.6km  height above Earth: 407.9km  elevation of Sun: -20
Disappears   19h28m06s  -2.6mag  az:180.2 S    h:26.3


The local time in 24-hour format at which the satellite is visible at its best. The satellite may be observable before this time. 0:00 or 0h00m is midnight, 12h is noon, 18h is 6 pm. The time zone is the one indicated on the left of the Earth icon on top of (almost) each page. Daylight saving is applied automatically.
Local time at which the satellite appears visually. The first figure indicates the visual brightness of the object. The smaller the number, the brighter and more eye-catching it appears to an observer. The units are astronomical magnitudes [m]. Azimuth is given in degrees counting from geographic north clockwise to the east direction. The three-character direction code is given as well. In case the satellite exits from the Earth shadow and comes into the glare of the Sun, the elevation above horizon is given in degrees for this event. If this figure is omitted, the satellite is visible straight from the horizon.

Time at which the satellite reaches his highest point in the sky as seen from the observer. For description of the figures see Appears.
Visually "better" passes of satellites are indicated by highlighting the information. The selection within the list of all possible transits is coupled with the observer level, the daylight, and several other conditions.

at Meridian
Time of the transit of the meridian, i.e. the satellite is due South or due North. At this time, the satellite will not reach its highest point of the pass. Look for culmination.

Local time of visual disappearance of the satellite. This may either be the time at which the satellite moves below the observer's horizon or the entry of the object in the shadow of Earth (the elevation is given for this event). The low Earth orbiting (LEO) satellites are usually visible for about 10 seconds more than the listed time, when they start fading rapidly.

The magnitude indicates the visual brightness of an object. The brightest star (Sirius) reaches -1.4m, whereas 6m is the limit of the unaided eye. Venus, the brightest planet, reaches -4m. The Moon at first quarter is -8m, about the same magnitude that the brightest Iridium flares can produce.


« Last Edit: February 04, 2018, 02:38:59 PM by Geoffw »