Problems are Mounting
Deck 36, Main Engineering
A cubesat has 6 solar sensors, one on each side of the satellite. At any given time, the sun can be observed by a maximum of 3 sensors at a time. The combination of measurements from 3 sensors provides the sun vector in the spacecraft coordinate system.
The spacecraft coordinate system is a Cartesian system with the origin at the center of the satellite. The sun vector, in combination with other observations such as the Earth magnetic field vector can be used to determine the full 3D attitude of the spacecraft.
During launch, the mounting angle of one of the sun sensors shifted and is no longer aligned with the spacecraft coordinate system's axis causing the sun vector determination to be wrong.
Determine which of the 6 sensors was shifted and find it's vector norm in order to make corrections to the attitude determination. To get the flag, find the correct vector norm of the shifted solar sensor.
Given information:
- 6 solar sensors on a CubeSat, one on each face. In spacecraft coordinates the vector norms should be (1,0,0), (0,1,0), (0,0,1), (-1,0,0), (0,-1,0), (0,0,-1).
- One of the sensors shifted and is no longer aligned with the axis of the satellite.
- Assume the satellite is always 1 A.U. (Astronomical Unit) distance from the sun).
- Each solar sensor has a 1 square cm area and a 10% efficiency. A 10 ohm resistor is used as a voltmeter.
Solution Statistics
| observations | 229 |
|---|---|
| solves | 26 |
| points | 134 |
| average solve seconds | 37475 seconds, or about 10 hours |
| stddev solve time | 23119 seconds, or about 6 hours |
Solutions Over Time
| by time | solve count | solve percent |
|---|---|---|
| 2021-06-26 23:00:00 UTC | 1 | 3% |
| 2021-06-27 00:00:00 UTC | 2 | 7% |
| 2021-06-27 01:00:00 UTC | 2 | 7% |
| 2021-06-27 02:00:00 UTC | 3 | 11% |
| 2021-06-27 03:00:00 UTC | 6 | 23% |
| 2021-06-27 04:00:00 UTC | 7 | 26% |
| 2021-06-27 05:00:00 UTC | 9 | 34% |
| 2021-06-27 06:00:00 UTC | 9 | 34% |
| 2021-06-27 07:00:00 UTC | 12 | 46% |
| 2021-06-27 08:00:00 UTC | 12 | 46% |
| 2021-06-27 09:00:00 UTC | 12 | 46% |
| 2021-06-27 10:00:00 UTC | 12 | 46% |
| 2021-06-27 11:00:00 UTC | 13 | 50% |
| 2021-06-27 12:00:00 UTC | 15 | 57% |
| 2021-06-27 13:00:00 UTC | 16 | 61% |
| 2021-06-27 14:00:00 UTC | 18 | 69% |
| 2021-06-27 15:00:00 UTC | 19 | 73% |
| 2021-06-27 16:00:00 UTC | 20 | 76% |
| 2021-06-27 17:00:00 UTC | 21 | 80% |
| 2021-06-27 18:00:00 UTC | 24 | 92% |
| 2021-06-27 19:00:00 UTC | 24 | 92% |
| 2021-06-27 20:00:00 UTC | 26 | 100% |
solving teams:
solved by 26 teams
| team | solved at | it took |
|---|---|---|
| FluxRepeatRocket | 2021-06-26 22:43:05 UTC | 2786 seconds, or 0.77 hours |
| PPP | 2021-06-26 23:59:25 UTC | 7370 seconds, or 2.05 hours |
| mhackeroni | 2021-06-27 01:31:10 UTC | 12815 seconds, or 3.56 hours |
| Solar Wine | 2021-06-27 02:20:07 UTC | 15803 seconds, or 4.39 hours |
| Poland Can Into Space | 2021-06-27 02:33:47 UTC | 16631 seconds, or 4.62 hours |
| SingleEventUpset | 2021-06-27 02:56:23 UTC | 17971 seconds, or 4.99 hours |
| STRship Troopers | 2021-06-27 03:57:57 UTC | 21640 seconds, or 6.01 hours |
| Katzebin | 2021-06-27 04:25:46 UTC | 21567 seconds, or 5.99 hours |
| 1064CBread | 2021-06-27 04:48:03 UTC | 23937 seconds, or 6.65 hours |
| DiceGang | 2021-06-27 06:09:18 UTC | 29534 seconds, or 8.2 hours |
| The Additional Payphones | 2021-06-27 06:18:14 UTC | 26742 seconds, or 7.43 hours |
| WeightedCompanionCube | 2021-06-27 06:47:22 UTC | 31398 seconds, or 8.72 hours |
| BLÅHAJ | 2021-06-27 10:30:20 UTC | 42954 seconds, or 11.93 hours |
| WeltALLES! | 2021-06-27 11:49:09 UTC | 49867 seconds, or 13.85 hours |
| UntamedFriesians | 2021-06-27 11:53:03 UTC | 49579 seconds, or 13.77 hours |
| SODIUM-24 | 2021-06-27 12:48:57 UTC | 11217 seconds, or 3.12 hours |
| Johns Hackins | 2021-06-27 13:48:00 UTC | 56721 seconds, or 15.76 hours |
| Tea MSG | 2021-06-27 13:52:38 UTC | 55417 seconds, or 15.39 hours |
| OneSmallHackForMan | 2021-06-27 14:07:17 UTC | 58042 seconds, or 16.12 hours |
| 📡🐺🔥🔥🔥 | 2021-06-27 15:44:58 UTC | 55799 seconds, or 15.5 hours |
| vMag | 2021-06-27 16:09:34 UTC | 65305 seconds, or 18.14 hours |
| BoozingAltitude | 2021-06-27 17:15:47 UTC | 68822 seconds, or 19.12 hours |
| b01lers | 2021-06-27 17:29:14 UTC | 69807 seconds, or 19.39 hours |
| ToTheMoon | 2021-06-27 17:41:17 UTC | 70128 seconds, or 19.48 hours |
| NSL | 2021-06-27 19:33:30 UTC | 77582 seconds, or 21.55 hours |
| Chanterelle | 2021-06-27 19:35:04 UTC | 14906 seconds, or 4.14 hours |