| タイトル | Entry, Descent, and Landing Performance of the Mars Phoenix Lander |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080034645 |
| 著者（英） | Grover, Myron R.; Cruz, Juan R.; Prince, Jill L.; Wueen, Eric M.; Desai, Prasun N. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2008-08-18 |
| 言語 | eng |
| 内容記述 | On May 25, 2008, the Mars Phoenix Lander successfully landed on the northern arctic plains of Mars. An overview of a preliminary reconstruction analysis performed on each entry, descent, and landing phase to assess the performance of Phoenix as it descended is presented and a comparison to pre-entry predictions is provided. The landing occurred 21 km further downrange than the predicted landing location. Analysis of the flight data revealed that the primary cause of Phoenix s downrange landing was a higher trim total angle of attack during the hypersonic phase of the entry, which resulted in Phoenix flying a slightly lifting trajectory. The cause of this higher trim attitude is not known at this time. Parachute deployment was 6.4 s later than prediction. This later deployment time was within the variations expected and is consistent with a lifting trajectory. The parachute deployment and inflation process occurred as expected with no anomalies identified. The subsequent parachute descent and powered terminal landing also behaved as expected. A preliminary reconstruction of the landing day atmospheric density profile was found to be lower than the best apriori prediction, ranging from a few percent less to a maximum of 8%. A comparison of the flight reconstructed trajectory parameters shows that the actual Phoenix entry, descent, and landing was close to pre-entry predictions. This reconstruction investigation is currently ongoing and the results to date are in the process of being refined. |
| NASA分類 | Lunar and Planetary Science and Exploration |
| レポートNO | AIAA 2008-7346 |
| 権利 | No Copyright |
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