International Space Station over Pembrokeshire this week

Welcome to Pembrokeshire U3A Forums Astronomy Group International Space Station over Pembrokeshire this week

  • This topic is empty.
Viewing 1 post (of 1 total)
  • Author
  • #9264

    Wednesday 27 September 2017
    Appears      20h07m07s  0.2mag  az:207.0° SSW  horizon
    Culmination  20h11m54s  -2.4mag  az:142.9° SE  h:17.7°
    distance: 1090.8km  height above Earth: 410.2km  elevation of Sun: -11°
    Disappears  20h12m52s  -2.4mag  az:120.6° ESE  h:15.8°

    Thursday 28 September 2017
    Appears      20h50m39s  0.7mag  az:235.1° SW  horizon
    Disappears  20h55m47s  -3.7mag  az:162.5° SSE  h:42.9°

    Friday 29 September 2017 ADDED ENTRY!
    Appears      19h58m47s  0.8mag  az:224.0° SW  horizon
    Culmination  20h03m55s  -3.1mag  az:150.3° SSE  h:30.0°
    distance: 757.8km  height above Earth: 410.7km  elevation of Sun: -10°
    Disappears  20h05m55s  -2.5mag  az: 97.1° E    h:16.4°

    Saturday 30 September 2017  ADDED ENTRY!
    Appears      19h07m05s  0.7mag  az:211.8° SSW  horizon
    Culmination  19h11m58s  -2.5mag  az:144.9° SE  h:20.5°
    distance: 991.1km  height above Earth: 409.8km  elevation of Sun: -3°
    Disappears  19h15m56s  -1.3mag  az: 83.0° E    h:3.8°

    Appears      20h42m44s  1.3mag  az:248.6° WSW  horizon
    Culmination  20h48m04s  -4.2mag  az:163.8° SSE  h:65.9°
    distance: 448.4km  height above Earth: 411.7km  elevation of Sun: -17°
    Disappears  20h48m36s  -4.1mag  az:112.0° ESE  h:53.8°


    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.

Viewing 1 post (of 1 total)
  • You must be logged in to reply to this topic.