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    3M22 Zircon Hypersonic Cruise Missile

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    mnztr

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    Post  mnztr Fri May 21, 2021 4:39 am

    Hole wrote:You can´t park a satellite.

    Sure you can, geosynchronus orbit, although it may be too high too be useful for this sort of thing.
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    Post  GarryB Fri May 21, 2021 11:26 am

    You can park a satellite... but around the equator and it is really very very high... too high to be much use with optics.

    I rather suspect these tests will take place in the Northern fleet in the arctic ocean.... not somewhere easy for geostationary orbit satellites to observe.

    Note if you have a satellite dish then you are using a geostationary satellite... it goes around the equator at an altitude where it takes one day to go around the earth... meaning it effectively hovers in the air so you can point a fixed satellite dish at it and not have to move the dish to follow the satellite.
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    Daniel_Admassu

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    Post  Daniel_Admassu Fri May 21, 2021 2:00 pm

    Optical reconnaissance satellites are usually operated between ~500 and ~2000 km and circle the earth numerous times a day. They can also be placed at any desired inclination to cover any territory.

    The thing is, their orbit is precisely known to everyone and thus any activity can be scheduled to avoid them. They are best used to snoop on stationery assets.
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    mnztr

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    Post  mnztr Fri May 21, 2021 5:45 pm

    Daniel_Admassu wrote:Optical reconnaissance satellites are usually operated between ~500 and ~2000 km and circle the earth numerous times a day. They can also be placed at any desired inclination to cover any territory.

    The thing is, their orbit is precisely known to everyone and thus any activity can be scheduled to avoid them. They are best used to snoop on stationery assets.

    They do have satellites that can manuver, but repositioning uses a LOT of fuel and there are only so many cycles they can do. Its crazy expensive for each reposition. But I think in this case the Russians will want the US to monitor the test and show that it works...if it does. The Russians also played a lot of games with decoys and repositioning of assets to cause the USA to inflate their estimates in the past.
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    Post  Daniel_Admassu Fri May 21, 2021 6:08 pm

    mnztr wrote:
    Daniel_Admassu wrote:Optical reconnaissance satellites are usually operated between ~500 and ~2000 km and circle the earth numerous times a day. They can also be placed at any desired inclination to cover any territory.

    The thing is, their orbit is precisely known to everyone and thus any activity can be scheduled to avoid them. They are best used to snoop on stationery assets.

    They do have satellites that can manuver, but repositioning uses a LOT of fuel and there are only so many cycles they can do. Its crazy expensive for each reposition. But I think in this case the Russians will want the US to monitor the test and show that it works...if it does. The Russians also played a lot of games with decoys and repositioning of assets to cause the USA to inflate their estimates in the past.

    Satellites are not usually repositioned in orbit. The gravitational and angular momentum gradient is too steep for that. They are just put in an initial inclination by the carrier vehicle and they stay that way. What little propellant (like hydrazine) they carry is used to correct attitude errors and altitude loss due to trace atmosphere and solar wind pressure over its lifetime.

    But the advantage of an inclined orbit with respect to the equator is, since the earth rotates on its axis, the orbit traces a kind of helical rotating path over its sphere. This allows for surveillance of potentially the whole globe.

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    GarryB
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    Post  GarryB Sat May 22, 2021 8:34 am

    It also creates a predictable timetable for when the satellite will be able to see things in a specific area.

    If you are interested in such things there is a website called Heavens Above, which tracks all sorts of satellites.

    www.heavens-above.com

    Click on the above link and then on the left hand side under configuration and below login it has a link to set your location.

    Click on that and use whatever method to specify your location and it and then on the main page again in the section titled Satellites under the title 10 day predictions for satellites of special interest... click on the ISS link and it will generate a 10 day chart for your location to observe the international space station as it flys over your location.

    The ISS is at about 350km altitude and orbits earth every 90 minutes, but depending on its flight path it might not go over your location in the next ten days.

    Note it shows visible passes so the sun needs to be shining on the ISS for it to be included in the list... it might pass your location early morning or late at night but it wont be both. Sometimes it will be visible twice on one day normally the same night or the same morning.

    At the top of the chart is the option to show all passes or just the visible ones... for observation the visible ones are the only ones worth bothering with.

    The columns for the chart are from left to right the day and then the brightness... note the lower the number the brighter it is... so minus 3.7 is much brighter than 0.4 or something. A full moon is something like minus 6, so minus 3.7 is a very bright venus type view.

    There are then three big columns... start, highest point, and end. Start is obviously when the station will become visible and it shows the time, direction and altitude from the horizon you should be looking to see it appear. I normally ignore the highest point, the end column shows the time and direction and altitude above the horizon when the station will enter shadow and no longer be visible.

    Depending on the angles and where you are it can be visible for up to 6 minutes at a time, but could easily not be visible at all as it passes over.

    On the main page of the site there is an image showing the location of the ISS over planet earth... it of course goes over during day time but it is not visible.

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