Iranian Space program

[Daneshmand]

Ok. It seems now that the thrusters are not working as designed. The orbit is deteriorating.

 

[Arminkh]

Ok. It seems now that the thrusters are not working as designed. The orbit is deteriorating.

Is it? Where did you read about it?

 

[Dominance]

Check the altitude here: LIVE REAL TIME SATELLITE TRACKING AND PREDICTIONS: FAJR

 

[Daneshmand]

Is it? Where did you read about it?

On live track, the perigee is now 222.51

Actually it is deteriorating fast. Maybe the thrusters fired on the wrong time, or some algorithmic error caused them to fire off at the wrong trajectory, and this deranged the orbit. We do not know. We can just speculate. Any ways, it is an opportunity to learn from it. Always is.

 

[Dominance]

The numbers are changing.
Now:
Perigee: 229.7 km
Apogee: 461.2 km
ALTITUDE [km]: 434.14 (Which was around 230 short while ago!)

 

[Arminkh]

On live track, the perigee is now 222.51

Actually it is deteriorating fast. Maybe the thrusters fired on the wrong time, or some algorithmic error caused them to fire off at the wrong trajectory, and this deranged the orbit. We do not know. We can just speculate. Any ways, it is an opportunity to learn from it. Always is.

It was 224 on Monday. I'm not sure how reliable these numbers are?

The numbers are changing.
Now:
Perigee: 229.7 km
Apogee: 461.2 km
ALTITUDE [km]: 434.14 (Which was around 230 short while ago!)

Give it up guys, it may all be an estimation using the parametric equation of the orbit. It is not precise and is fluctuating all the times. We have enough friends in this world who would love to announce the failure as soon as it is evident.

Right now Perigee is 222.68 based on live parameters.

 

[Arminkh]

Here is another conflicting news about the orbit. If this is true than the thrusters are working as now the NORAD parameter says the Perigee is 229.

Americans detect Iranian satellite | Vestnik Kavkaza

Americans detect Iranian satellite

4 February 2015 - 12:22pm
The US space surveillance system, administered by the Pentagon's Strategic Command, has confirmed the presence of the Iranian satellite 'Fajr' in orbit.



The satellite has received the international identification number 2015-006A (NORAD Catalog - 40387), and according to the American space surveillance system, it has launched into an initial orbit of 223 km by 470 km with an inclination of 55.4°. The period of revolution about the Earth is 91 minutes.



The Iranian news agency 'Fars' reported that Iran yesterday put the 'Fajr' satellite, which was entirely designed and built in Iran, into orbit. Nevertheless, the American system was not able to confirm this information.

 

[Pangu]

Very nice! Great going Persians!

 

[SOHEIL]

Ok. It seems now that the thrusters are not working as designed. The orbit is deteriorating.

I think we have to wait ... Thruster hanoz khamoshe ...

 

[scythian500]

On live track, the perigee is now 222.51

Actually it is deteriorating fast. Maybe the thrusters fired on the wrong time, or some algorithmic error caused them to fire off at the wrong trajectory, and this deranged the orbit. We do not know. We can just speculate. Any ways, it is an opportunity to learn from it. Always is.

No speculations as none of us know that much about satellites and its design... let's us wait and see what happens

 

[MilSpec]

Good development.

 

[scythian500]

Satellies have normal rocket motors for maneuver, not Ion thrusters. Ion thrusters could not provide specific impulse to change orbit of satellites, unless you are ready to wait for years for your satellite to get into position.

Ion thrusters are used only in deep space exploration due to their fuel efficiency.

@Irfan Baloch

But the existence of both Cold Gas Thruster and an Ion Thruster is a certain in this sat. I think, as they announced they are testing this new systems in order to use it for future deep space launches in 2 years. It is an experimental Satellite per ISA announcements. They are also testing two cameras. One Black-White and one Color Camera on board.

 

[lavenge lavenge]

But the existence of both Cold Gas Thruster and an Ion Thruster is a certain in this sat. I think, as they announced they are testing this new systems in order to use it for future deep space launches in 2 years. It is an experimental Satellite per ISA announcements. They are also testing two cameras. One Black-White and one Color Camera on board.

Dude,

Ion thrusters could not even generate specific thrust to even move a satellite by a cm. This is a basic physical limitation, not of engineering one which you could overcome. Putting it on satellite is stupid.

This while assuming that Iran even has Ion thrusters, given that Iran has no interplanetary program; only place where they could be used.

You media is known for it's hyperbole. It is probably that only.

 

[haman10]

Dude,

Ion thrusters could not even generate specific thrust to even move a satellite by a cm. This is a basic physical limitation, not of engineering one which you could overcome. Putting it on satellite is stupid.

This while assuming that Iran even has Ion thrusters, given that Iran has no interplanetary program; only place where they could be used.

You media is known for it's hyperbole. It is probably that only.

there is no ion thruster on this sat .

only Cold Gas Thrusters

 

[scythian500]

there is no ion thruster on this sat .

only Cold Gas Thrusters

ماهواره ملی فجر نخستین ماهواره بومی ایران است که مأموریت مانور مداری دارد. این ماهواره از زیرسامانه پیش‌رانش گاز سرد برای انتقال مداری استفاده می‌کند. علاوه بر سامانه پیش‌رانش گاز سرد ماهواره فجر از رانش‌زای پالس پلاسمایی که یک رانش‌زای الکتریکی با ضربه ویژه بسیار بالا است به‌عنوان محموله فرعی بهره‌گیری خواهد کرد. این رانش‌زا باعث دوران ماهواره حول مرکز جرم خود خواهد شد. از این ماهواره در سال 1389 رونمایی شد.

ماهواره فجر چگونه یک و نیم سال عمر می‌کند؟
ماهواره امید نخستین ماهواره بومی ایران که با یک ماهواره‌بر بومی به فضا پرتاب شد، حدود سه ماه در فضا ماند و پس از حدود ۱۲۰۰ چرخش دور زمین در این مدت، ارتفاع مداری‌اش به‌اندازه‌ای کاهش یافت که وارد جو شد و سوخت؛ اما ماهواره فجر که نسخه پیشرفته‌تر ماهواره امید است، از نظر زمانی می‌تواند پنج برابر بیشتر در فضا بماند. ارتفاع مداری اولیه هردو ماهواره امید و فجر تقریباً یکی است ولی روی ماهواره فجر رانش‌زا (موتور کوچک فضایی) نصب شده است. با هر چرخش ماهواره به دور زمین، اصطکاک آن با هوای رقیق موجود در آن ارتفاع باعث اتلاف انرژی جنبشی ماهواره شده و ارتفاع مداری آن را کاهش می‌دهد؛ اما هر بار ماهواره به نقطه اوج خود می‌رسد، رانش‌زای روی آن به حالت ضربه‌ای روشن شده و در فضای نیروی لازم برای افزایش ارتفاع مداری را فراهم می‌کند. بعد از چندین ضربه رانش‌زا در مدار، ماهواره فجر از مداری بیضوی به یک مدار دایروی با ارتفاع حدود ۴۷۰ کیلومتری از سطح زمین منتقل شده و بدین ترتیب تا حدود یک سال و نیم در مدار زمین باقی می‌ماند. این فرایند در چنین مأموریتی درواقع یک تجربه برای ساخت ماهواره‌های بعدی کشور جهت حضور در مدارهای بالاتر است.
موفقیت اولیه ماهواره فجر در ارتقای مدار

Dude,

Ion thrusters could not even generate specific thrust to even move a satellite by a cm. This is a basic physical limitation, not of engineering one which you could overcome. Putting it on satellite is stupid.

This while assuming that Iran even has Ion thrusters, given that Iran has no interplanetary program; only place where they could be used.

You media is known for it's hyperbole. It is probably that only.

ISA agency itself says so....