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Phobos (Natural Colors; credits: NASA)
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Phobos, and the second Martian moon, Deimos, are interesting for several reasons. Both objects are small, with average diameters of just 22 and 12 Km, respectively.
At this size, their gravity is insufficient (less than 1/1000th of Earth) to pull them into spherical shapes, in contrast to the larger moons and planets in the Solar System.
Both moons are tidally locked to Mars, meaning, like our own moon relative to Earth, they present the same side to Mars all the time. The small size and composition (determined from spectroscopy) of Phobos and Deimos make them very similar to some asteroids.
Most asteroids are located in a belt between Mars and Jupiter, with others having orbits that cross that of Mars. Therefore, it is possible that Phobos and Deimos are captured asteroids.
Other hypotheses are that they formed with Mars in the early Solar System, or are composed of material blasted off of Mars by impacts.
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MRO:ANALOG_POWER_START_TIME = 2008-03-23T21:01:10.436
MRO:ANALOG_POWER_START_COUNT = "890773290:26757"
/* Time when the observation first started. */
MRO:OBSERVATION_START_TIME = 2008-03-23T21:05:19.886
MRO:OBSERVATION_START_COUNT = "890773539:56279"
/* Time at the beginning of the first calibration image line. */
MRO:CALIBRATION_START_TIME = 2008-03-23T21:05:21.513
MRO:CALIBRATION_START_COUNT = "890773541:31801"
/* Time at the beginning of the first target image line. */
START_TIME = 2008-03-23T21:05:21.708
SPACECRAFT_CLOCK_START_COUNT = "890773541:44591"
/* Time at the end of the last target image line. */
STOP_TIME = 2008-03-23T21:05:30.268
SPACECRAFT_CLOCK_STOP_COUNT = "890773550:15756"
/* Time when the CPMM readout started. */
MRO:READOUT_START_TIME = 2008-03-23T21:07:35.409
MRO:READOUT_START_COUNT = "890773675:24999"
/* Time when this EDR product was created. */
PRODUCT_CREATION_TIME = 2008-03-24T00:13:55
END_GROUP = TIME_PARAMETERS
/* Instrument settings. */
GROUP = INSTRUMENT_SETTING_PARAMETERS
MRO:CPMM_NUMBER = 13
MRO:CHANNEL_NUMBER = 1
FILTER_NAME = "RED"
CENTER_FILTER_WAVELENGTH = 700 <NANOMETERS>
BANDWIDTH = 300 <NANOMETERS>
MRO:SCAN_EXPOSURE_DURATION = 856.0000 <MICROSECONDS>
MRO:LINE_EXPOSURE_DURATION = 3424.0000 <MICROSECONDS>
MRO:IMAGE_EXPOSURE_DURATION = 8755168.0000 <MICROSECONDS>
MRO:DELTA_LINE_TIMER_COUNT = 12512
MRO:POWERED_CPMM_FLAG = (ON, ON, ON, ON, ON, ON, ON, ON, ON, ON,
ON, ON, ON, ON)
MRO:BINNING = 4
MRO:TDI = 128
MRO:TRIM_LINES = 1182
MRO:FOCUS_POSITION_COUNT = 2073
MRO:FELICS_COMPRESSION_FLAG = NO
MRO:STIMULATION_LAMP_FLAG = (OFF, OFF, OFF)
MRO:HEATER_CONTROL_MODE = "CLOSED LOOP"
MRO:HEATER_CONTROL_FLAG = (ON, ON, ON, ON, ON, ON, ON, ON, ON, ON,
ON, ON, ON, ON)
MRO:LOOKUP_TABLE_TYPE = "N/A"
MRO:LOOKUP_TABLE_MINIMUM = -9998
MRO:LOOKUP_TABLE_MAXIMUM = -9998
MRO:LOOKUP_TABLE_MEDIAN = -9998
MRO:LOOKUP_TABLE_K_VALUE = -9998
MRO:LOOKUP_TABLE_NUMBER = -9998
/* This table provides a reverse mapping */
/* from 8-bit EDR image data back to 14-bit observation data. */
/* Each node of the map is the (lower, upper) inclusive range*/
/* of the original 14-bit observation value */
/* that was translated to the 8-bit image value */
/* corresponding to the node number (first node = 0). */
/* Unused image values have the special range (-9998, -9998).*/
/* A special ((0, 0)) map indicates that no LUT was applied. */
MRO:LOOKUP_CONVERSION_TABLE = ((0, 0))
/* Waveform sampling timing settings: (image, reset). */
MRO:ADC_TIMING_SETTINGS = (5, 4)
/* Clocks timing locks: (first clock, second clock). */
MRO:DLL_LOCKED_FLAG = (YES, YES)
MRO:DLL_LOCKED_ONCE_FLAG = (YES, YES)
MRO:DLL_RESET_COUNT = 0
MRO:DLL_FREQUENCY_CORRECT_COUNT = 4
END_GROUP = INSTRUMENT_SETTING_PARAMETERS
/* Temperature sensor readings at observation start. */
GROUP = TEMPERATURE_PARAMETERS
MRO:OPT_BNCH_FLEXURE_TEMPERATURE = 19.4148 <C>
MRO:OPT_BNCH_MIRROR_TEMPERATURE = 19.9348 <C>
MRO:OPT_BNCH_FOLD_FLAT_TEMPERATURE = 19.8482 <C>
MRO:OPT_BNCH_FPA_TEMPERATURE = 20.0215 <C>
MRO:OPT_BNCH_FPE_TEMPERATURE = 20.0215 <C>
MRO:OPT_BNCH_LIVING_RM_TEMPERATURE = 19.5015 <C>
MRO:OPT_BNCH_BOX_BEAM_TEMPERATURE = 19.6748 <C>
MRO:OPT_BNCH_COVER_TEMPERATURE = 19.8482 <C>
MRO:FIELD_STOP_TEMPERATURE = 18.1151 <C>
MRO:FPA_POSITIVE_Y_TEMPERATURE = 25.9221 <C>
MRO:FPA_NEGATIVE_Y_TEMPERATURE = 25.6615 <C>
MRO:FPE_TEMPERATURE = 25.5747 <C>
MRO:PRIMARY_MIRROR_MNT_TEMPERATURE = 19.8482 <C>
MRO:PRIMARY_MIRROR_TEMPERATURE = 20.1082 <C>
MRO:PRIMARY_MIRROR_BAF_TEMPERATURE = 1.18861 <C>
MRO:MS_TRUSS_LEG_0_A_TEMPERATURE = 20.0215 <C>
MRO:MS_TRUSS_LEG_0_B_TEMPERATURE = 20.455 <C>
MRO:MS_TRUSS_LEG_120_A_TEMPERATURE = 19.2415 <C>
MRO:MS_TRUSS_LEG_120_B_TEMPERATURE = 20.0215 <C>
MRO:MS_TRUSS_LEG_240_A_TEMPERATURE = 20.1082 <C>
MRO:MS_TRUSS_LEG_240_B_TEMPERATURE = 20.455 <C>
MRO:BARREL_BAFFLE_TEMPERATURE = -22.3704 <C>
MRO:SUN_SHADE_TEMPERATURE = -79.8521 <C>
MRO:SPIDER_LEG_30_TEMPERATURE = -1.39247 <C>
MRO:SPIDER_LEG_150_TEMPERATURE = -0.962479 <C>
MRO:SPIDER_LEG_270_TEMPERATURE = -0.962479 <C>
MRO:SEC_MIRROR_MTR_RNG_TEMPERATURE = 19.7615 <C>
MRO:SEC_MIRROR_TEMPERATURE = 18.2883 <C>
MRO:SEC_MIRROR_BAFFLE_TEMPERATURE = -25.2674 <C>
MRO:IEA_TEMPERATURE = 25.7484 <C>
MRO:FOCUS_MOTOR_TEMPERATURE = 21.2354 <C>
MRO:IE_PWS_BOARD_TEMPERATURE = 28.4424 <C>
MRO:CPMM_PWS_BOARD_TEMPERATURE = 39.1485 <C>
MRO:MECH_TLM_BOARD_TEMPERATURE = 35.0546 <C>
MRO:INST_CONT_BOARD_TEMPERATURE = 35.0546 <C>
END_GROUP = TEMPERATURE_PARAMETERS
/* Instrument electrical power sensor readings. */
GROUP = POWER_PARAMETERS
MRO:CPMM_POSITIVE_29_VOLTAGE = 29.1082 <V>
MRO:CPMM_POSITIVE_29_CURRENT = 0.215986 <A>
MRO:CPMM_POSITIVE_10_VOLTAGE = 9.02174 <V>
MRO:CPMM_POSITIVE_10_CURRENT = 2.35298 <A>
MRO:CPMM_POSITIVE_5_VOLTAGE = 5.02806 <V>
MRO:CPMM_POSITIVE_5_CURRENT = 7.74746 <A>
MRO:CPMM_POSITIVE_3_3_VOLTAGE = 3.31305 <V>
MRO:CPMM_POSITIVE_3_3_CURRENT = 1.58509 <A>
MRO:CPMM_POSITIVE_2_5_VOLTAGE = 2.50663 <V>
MRO:CPMM_POSITIVE_2_5_CURRENT = 0.321321 <A>
MRO:CPMM_POSITIVE_1_8_VOLTAGE = 1.81145 <V>
MRO:CPMM_POSITIVE_1_8_CURRENT = 4.32426 <A>
MRO:CPMM_NEGATIVE_5_VOLTAGE = -5.05577 <V>
MRO:CPMM_NEGATIVE_5_CURRENT = -0.711357 <A>
MRO:HEATER_CURRENT = 0.645995 <A>
MRO:INST_CONT_FPGA_POS_2_5_VOLTAGE = 2.54639 <V>
MRO:MECH_TLM_FPGA_POS_2_5_VOLTAGE = 2.56958 <V>
MRO:IEA_POSITIVE_28_VOLTAGE = 30.6599 <V>
MRO:IEA_NEGATIVE_15_VOLTAGE = -15.2845 <V>
MRO:IEA_POSITIVE_15_VOLTAGE = 15.1719 <V>
MRO:IEA_POSITIVE_5_VOLTAGE = 5.06348 <V>
END_GROUP = POWER_PARAMETERS