International Space Station over Pembrokeshire

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    Stargazer

    Saturday 26 February 2011

    Appears    18h33m18s  2.1mag  WSW  horizon
    Culmination   18h38m10s  -3.9mag  az:158.7? SSE 
    distance:     480.1km  height above Earth: 355.4km
    Disappears  18h40m53s  -2.2mag  84.5? E 

    Sunday 27th February 2011

    Appears    18h59m15s  2.9mag  az:255.9? WSW 
    Culmination   19h04m11s  -4.4mag  az:168.9? S
    distance:     365.0km  height above Earth: 356.0km
    Disappears  19h06m03s  -3.0mag  az: 85.0? E   

    iss_top.jpg

    Time
    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.
    Appears
    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.
    Culmination
    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.
    Disappears
    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.
    Magnitude/Mag:
    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.

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