Questions tagged [sun-synchronous]

Questions about orbits utilizing nodal precession so that spacecraft are able to maintain the same local mean solar time at any given point of an orbit. The effect is achieved through choosing inclination and altitudes of the apses.

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13
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2answers
3k views

Why would Sun-synchronous orbits be impossible around perfectly spherical bodies?

This is a special case follow-up to Are sun-synchronous orbits possible around any body? Reading Wikipedia on Sun-synchronous orbit a few days ago when trying to refresh my memory on orbital mechanics ...
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1answer
865 views

Are sun-synchronous orbits possible around any body?

Sun-synchronous orbits are popular around Earth, and the Mars Reconnaisance Orbiter uses one as well (so I think Wikipedias definition as a geocentric orbit is wrong). Considering that probably any ...
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2answers
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Why does the Sun-synchronous orbital plane rotate?

I've seen this movie: It shows Sun-synchronized orbit of a satellite. What causes this orbit to be Sun-synchronized? I mean, from what I know, it shouldn't rotate as ...
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1answer
522 views

How risky is launching a rocket during a geomagnetic and solar radiation storm?

Today's launch of Arianespace Vega rocket deploying Sentinel 2A Earth observation satellite for ESA & European Commission went ahead as planned, lifting off on June 23, 2015 at exactly 01:51:58 ...
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2answers
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Are sun synchronous orbits possible for any place on Earth?

Do sun-synchronous orbit pass any spot around Earth at a specified local time? If yes or no, what is the reason? (I know that this type of orbit passes everywhere at the equator at the same local time....
8
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1answer
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How Local time of a sun synchronous orbit is related to Right ascension of ascending node?

My question may sound naive and hence would like to apologise if this question is already answered in same or other form in this forum. How does ...
6
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3answers
335 views

Are sun-synchronous orbits always North to South?

So someone told me that weather satellites orbit from north to south generally because that helps them to obtain a sun-synchronous orbit (his explanation for why this was true was too complicated for ...
6
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1answer
2k views

formula linking RAAN and LTAN

I just want to ask if someone does possess the formula linking the local hour to the right ascension of the ascending node (RAAN). I will try to explain myself: I know that I want my satellite to be ...
4
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4answers
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Sun synchronous orbit and LTAN

I have to size the electric power system for a satellite on a circular, sun-synchronous orbit at 800 km altitude. In the problem I have been given the LTAN (Local Time of the Ascending Node) also, ...
4
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2answers
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How does one dogleg from Florida to a sun-synchronous orbit?

From NASA Spaceflight's article SpaceX Falcon 9 launches first NRO mission with NROL-76: The NROL-76 launch was not to be targeting a sun-synchronous orbit, typically used by the NRO’s optical ...
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499 views

MOM's NOT-so-sun-synchronous orbit about Mars - how large is it's J2?

edit: See my supplementary answer below for additional information. @Hohmannfan nailed it. This question and answer started me wondering - how big is the J2 (oblateness) term of Mars' gravity ...
4
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1answer
63 views

Mechanics of Sun-Synchronous Orbit & North Korea's KMS-4

QUICK QUESTION: Is North Korea's KMS-4 in a proper Sun-synchronous orbit? https://www.n2yo.com/?s=41332 2016-009A FOLLOW-UP QUESTION: How do I tell? I want to understand the mechanics. RESEARCH:...
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0answers
151 views

How can I find orbital parameters for a sun-synchronous orbit?

I would like to compute ephemerides for a satellite on a sun-synchronous orbit, starting with only the following parameters1: altitude or inclination; local time of the ascending or descending node; ...
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2answers
115 views

What is the official universal time system of Mars?

According to standing global treaty organizations specifications, 'What is the official universal time system of Mars?'
3
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1answer
232 views

Could a cubesat in a 500km SSO orbit effectively monitor earth?

If you were looking for, say, a 1m per pixel quality, what focal length/sensor size would you need? Would there be any off the shelf/commercial solutions?
3
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2answers
701 views

Is it possible to have a “figure-8” orbit around the Moon and the Earth, and perhaps always face the sun?

Is it possible to have a 'figure 8' orbit around the Earth and the Moon? I'm looking for a non-decaying orbit that will not require significant rocket fuel to maintain, unlike the orbits used in the ...
3
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0answers
389 views

If a sun-synchronous orbit passes over the poles twice a year, how can it have a constant (e.g. 98°) inclination?

I am sooooo confused. The answer to Are sun synchronous orbits possible for any place on Earth? ends with In short, yes, sun-synchronous orbits are possible for any location on Earth. and mentions ...
3
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0answers
186 views

Is there a Lunar Sun-synchronous orbit over the terminator? [duplicate]

Dusk/dawn Sun-synchronous orbits are possible at Earth thanks to the fact that Earth is a bit flattened. Would it be possible with a similar orbit around the Moon? The flattening of the Moon seems to ...
2
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2answers
557 views

How are “terminator-riding” sun-synchronous satellites never passing over the pole?

The polar regions won't be missed as they will pass under the sun-synchronous orbit twice a year. – SF. Nov 19 '15 at 9:56 @SF. - Your comment is incorrect. Sun synchronous satellites never ...
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1answer
229 views

Reason for satellite passes at the same local time each day?

Is there any specific reason especially for the remote sensing satellites passing at the same local time over a particular place each day? I have some experience measuring the radiance received by ...
2
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1answer
85 views

What would be different about satellite orbits if Earth were prolate? Would we have Sun-synchronous and Molniya orbits?

It's hard to imagine how it could happen naturally since on geological timescales the Earth would either be spherical if it didn't rotate, or oblate if it did, but from an orbital mechanical ...
2
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1answer
198 views

Is there a significant difference between launching a polar orbit mission south from New Zealand versus launching it north?

The Channel News Asia article New Zealand launches into space race with 3D-printed rocket says: Ships and planes need re-routing every time a rocket is launched, which limits opportunities in ...
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1answer
429 views

Perturbation effects on sun-synchronous orbit

How do the following perturbation factors affect a sun-synchronous orbit? Atmospheric drag Solar gravity Lunar gravity Solar radiation pressure
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1answer
64 views

Maintenance manouvers for a Dawn-Dusk SSO?

I'm in charge of the ADCS for a class project, which consists on a 25U-cubesat, in a 650-km dawn-dusk Sun-synchronous orbit or SSO. What are the orbit correction/maintenance manouvers a spacecraft ...
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0answers
170 views

Is there a “dusk-dawn” sun-synchronous lunar orbit? [duplicate]

Is it possible to have a Lunar "dusk-dawn" Sun-synchronous orbit, where a spacecraft can always be exposed to sunlight 24x7 over the terminator line?
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0answers
319 views

Local Time drift of Sun synchronous orbit [closed]

How does inclination perturbation affect drift in local time of a sun synchronous orbit? e.g orbit with inclination of 98 degrees and height 600km with local time 10:30
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1answer
150 views

What is the darkest orbit around Earth?

What orbits around Earth has the least and most sun light exposure? I wondered: When taking pictures either of Earth or otherwise with various telescopes in orbit, does it help to be in Earth's ...
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0answers
152 views

Length of time in a satellite spends in Earths shadow

I have come across a problem that has had me stumped for a while now. A spacecraft is in a Sun-synchronous Earth orbit with a =1.40 R⊕ and e = 0.2. The argument of periapsis is ω = 0◦ , and the ...
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0answers
143 views

Satellite Orbit-Sun Geometry of Sun synchronous Orbit

What is the difference in satellite orbit-sun geometry of Sun synchronous orbits of 6am local time , 9 am local time , 12 pm local time ?
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1answer
141 views

Satellites that take advantage of, or require constant availability of sunlight on the spacecraft itself, available in Sun-synchronous orbits?

ditto: "Are there satellites that take advantage of, or require constant availability of sunlight on the spacecraft itself, available in Sun-synchronous orbits?" This question is an offshoot of this ...
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1answer
375 views

Local Time Calculation

How To Calculate Local Time Of A Sun Synchronous Orbit With A Given Altitude ( Say 600 km ) , Inclination ( 98 degrees ) ?
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1answer
380 views

Rotation Of Line Of Apsides

Why does the line of apsides rotate in the plane of the orbit ? In case of a sun synchronous orbit does it have any effect on imaging accuracy or quality?