EXTRINFO.TXT All of the raw NIS data in the format used by the NEAR MSI/NIS team during the orbital mission. These data are 2-D FITS format files containing raw NIS data and ancillary housekeeping information for each spectrum. 1. Introduction. This folder contains all of the raw NIS data in the format used by the NEAR MSI/NIS team during the Eros orbital mission. The team found this format convenient to deal with for calibration, processing, and analysis (most of which was done using the Research Systems Inc. Interactive Data Language (IDL) software package). The raw data stored here is identical to the raw data archived in a different format in higher level directories on this CDROM, but future NIS data users may find the format presented here more convenient and simpler to access using tools like IDL. 2. File Format and Content. These files are 16-bit format FITS (Flexible Image Transport System; see Wells et al., 1981) files containing raw NIS data and ancillary housekeeping information for each spectrum. The files are subdivided into one file per NIS acquisition sequence. Each file has a 11520 byte ASCII header followed by 16-bit binary image data. The binary image data consists of 108 columns of spectral and ancillary housekeeping information and a variable number of rows (one row per spectrum) depending on the specific sequence. Information describing the content of each of the 108 columns of 16-bit numbers is stored in the 11520 byte long ASCII header of each file, and can be accessed by listing the header directly (for example, by doing a "more" of the file in Unix or Linux file systems). A summary of the contents of each of the 108 columns is provided in Table 1. Additional details about the definitions of housekeeping data and other variables stored in raw NIS files can be found in Izenberg et al. (2000), Warren et al. (1997), and JHU/APL (1995). 3. File Naming Scheme. Each file's name provides information about the time of acquisition and observing circumstances of each sequence. The file names are in the form: AB_nnnnnnnnn_mm_CDE.FIT where A is the NIS-specific mission phase, designated by letter; B is the subphase, designated by letter; nnnnnnnnn is the mission elapsed time (MET) stamp of the start of the first spectrum of the sequence, defined as number of seconds since launch at UT February 17 1996 20:43:28.78; mm is the sequence number, 00 to 15; C is the slit state; D is the gain of the Ge detector; E is the observing target; FIT designates that the data are in standard FITS format (Wells et al. 1981). Each term is explained further below: AB: NIS-specific mission phase and subphase are working divisions of the NIS observations within the NEAR mission. NIS-specific phases divide major mission "eras," e.g., A = initial cruise, B= Earth Swingby, etc. Subphases group a set of related observation sequences together, and allow easy distinction between observations close in time, but with different targets, sequence parameters, or scientific objectives. A list of NIS-specific mission phases and subphases is provided in Table 2. nnnnnnnnn: The MET corresponds to the first spacecraft 1-Hz pulse after the start of the first second of integration of the first spectrum of the sequence, i.e., 1 second after the actual start of the integration. See Section 6.2 of Izenberg et al. (2000) for a detailed explanation of relative timing of spectrum acquisition and the spacecraft pulse. mm: Sequences 00-02 are hardcoded on NIS turn-on. All are re-definable by command. See Section 2.2 of Izenberg et al. (2000) for more information on NIS sequences. C: Slit state is designated "W", "N", "V", or "C". "W" or "N" indicates the slit is wide or narrow while observing the target. If there are interleaved darks, the shutter is closed only for dark spectra, then returned to wide or narrow slit for the next iteration of the sequence. "V" indicates that the shutter state changes between narrow and wide within a single sequence. "C" indicates the entire sequence is acquired with shutter closed. D: Germanium detector gain is either "H" for high (10x), "L" for low (1x) or "V" for varying between high and low gain in the same sequence. See Warren et al. (1997) for more details on NIS gain state. E: A letter designates the observation target. Valid targets include: "C" for the caltarget, "S" for space, "E" for Eros, "H" for Earth (Home), "M" for Moon, "T" for special target. 4. Additional Information. Additional details and descriptions of the NIS-specific mission phases and NIS sequencing and calibration can be found in Izenberg et al. (2000), and additional details about the NIS instrument and NIS science goals and strategies can be found in Warren et al. (1997) and Veverka et al. (1997). Users desiring additional information about NIS data and NIS data formats can also contact either Jim Bell or Noam Izenberg (NEAR MSI/NIS team members) for more details. Jim Bell Noam Izenberg Cornell University Johns Hopkins University Department of Astronomy Applied Physics Laboratory 402 Space Sciences Building 11100 Johns Hopkins Road Ithaca NY 14853-6801 Laurel, Maryland 20723 jfb8@cornell.edu Noam.Izenberg@jhuapl.edu 5. References. Hayes, John, NEAR Infrared Spectrograph / Magnetometer (NIS/MAG) DPU Software Requirements Specification, 1995, Johns Hopkins University Applied Physics Laboratory document #7357-9001, Rev. A. Izenberg, N.R., J.F. Bell III, J.W. Warren, P. Martin, K. Peacock, E.H. Darlington, G. Heyler, S.L. Murchie, L. McFadden, D. Wellnitz, B. Clark, J. Joseph, B. Carcich, A. Harch, M. Robinson, C. Chapman, B. Merline, and J. Veverka (2000) In-flight Calibration of the Near Earth Asteroid Rendezvous Mission's Near Infrared Spectrometer I. Initial Calibrations, Icarus,148, 550-571, 2000. Veverka, J., J.F. Bell III, P. Thomas, A. Harch, S. Murchie, S.E. Hawkins III, J.W. Warren, H. Darlington, K. Peacock, C.C. Chapman, L.A. McFadden, M.C. Malin, and M.S. Robinson, An overview of the NEAR Multispectral Image (MSI)-Near Infrared Spectrometer (NIS) Investigation (1997) J. Geophys. Res., 102, 23709-23728. Warren, J.W., K. Peacock, E.H. Darlington, S.L. Murchie, S.F. Oden, and J.F. Bell III (1997) Near infrared spectrometer for the Near Earth Asteroid Rendezvous Mission, Space Science Reviews, 82, 101-167. Wells, D. C., E. W. Greisen, And R. H. Harten (1981) FITS: A Flexible Image Transport System, Astron. Astrophys Sppl. Ser. 44, 363-370. Table 1. Contents of each of the 108 columns in the MSI/NIS team raw NIS FITS files. Column Contents ______ ____________________________________________ 1 Mission elapsed time (high word) 2 Mission elapsed time (low word) 3 Spectrometer power (0=off,1=on) 4 Scan mirror drive select (0=primary,1=2ndary) 5 Shutter drive select (0=primary,1=secondary) 6 Slit drive select (0=primary,1=secondary) 7 Slit/shutter (0=W/Open,1=N/Open,2=W/Closed,3=N/Closed) 8 Ge detector gain (0=gain 1,1=gain 10) 9 Shutter out (0=yes,1=no) 10 Shutter in (0=yes,1=no) 11 Slit out (0=yes,1=no) 12 Slit in (0=yes,1=no) 13 Motor move voltage (0=hold,1=move) 14 Mirror instrumental nadir (0=inactive,1=active) 15 Mirror start (0=active,1=inactive) 16 Command scan mirror position 17 Actual scan mirror position 18 Mirror lost (0=no,1=yes) 19 Sequence aborted (0=no,1=yes) 20 Number of spectra coadded for this observation (row) 21 Offset to MET to get Mid-Spectrum Observation Time (ms) 22 10 * Ge detector temperature (deg. C) 23 10 * Ge inner board temperature (deg. C) 24 10 * Ge outer board temperature (deg. C) 25 10 * InGaAs detector temperature 1 (deg. C) 26 10 * InGaAs detector temperature 2 (deg. C) 27 10 * InGaAs inner board temperature (deg. C) 28 10 * InGaAs outer board temperature (deg. C) 29 10 * SSG scan motor temperature (deg. C) 30 10 * SSG scan mirror temperature (deg. C) 31 10 * SSG drive board temperature (deg. C) 32 10 * SSG detector base temperature (deg. C) 33 10 * NIS DC/DC temperature (deg. C) 34 10 * DPU DC/DC temperature (deg. C) 35 10 * SSG motor current (mA) 36 10 * NIS DC/DC current (mA) 37 10 * SSG DC/DC current (mA) 38 NIS DQI - 1st 4 bits trans. ch, 2nd 4 bits - data quality 39 SPARE 40 SPARE 41 SPARE 42 SPARE 43 SPARE 44 SPARE 45-76 Ge channel 1-32 raw DN values (0-4095) 77-108 InGaAs channel 33-64 raw DN values (0-4095) Table 2. NIS Mission Phases and Subphases. NIS Phase/Subphase DOY MET Range ______________________________________________________________________ A - Initial Cruise AA- NIS Checkout 96_108-96_110 005195300-005307000 AB - All-On Test 96_143 008134300-008214500 AC - Dark Test 97-220 046462700-046469100 AD - Dark Test 97-260 049913000-049921100 AE - Cover open 97-267 050512200-050522100 AF - NIS Checkout (Caltarget A) 97-269 050668100-050677100 B - Earth Flyby BA - Earth - Asia/Africa 98_023 060949600-060951200 BB - Earth - S. Africa 98_023 060952200-060952700 BC - Earth - Antarctica 98_023 060953700-060954000 BD - Moon Radiometry 98_023 060993100-060995800 BE - Caltarget B 98_023 061004500-061005100 BF - Moon MSI/NIS Coalign 98_026 061216600-061218800 C - Final Cruise CA - 300 sec. Dark Tests 98_231 078897700-078899000 CB - Caltarget C 98_231 078899000-078901000 CC - Full Nixel Test-Caltarget 98_231 078901000-078909000 CD - 300 sec. Dark Tests 98_231 078909000-078910000 CE - Jupiter Mirror Plane Test 98_231 078924000-078932000 CF - Seq. Exerciser/Throughput 98_313 085993000-086005000 CG - Global seq. Test 98_323 086664000-086860000 CH - Caltarget Stability Test 98_324 086930000-086936900 CI - Deep Space Caltarget 1 98_324 086937000-086939000 CJ - SDC Throughput 98_348 089043000-089047000 CK - Light Curve "3"* 98_349 089099000-089120600 D - Eros Approach/Flyby DA - Contingency Sequence 98_357 089837000-089861000 E - Eros-Eros Cruise EA - Caltarget 2 99_041 094087000-094095000 EB - Caltarget 3 99_042 094178000-094182000 EC - Caltarget 4 99_049 094782000-094787000 ED - Caltarget 5 99_088 098113000-098117000 EE - Caltarget 6 99_109 099927000-099931000 EF - Dark cals 99_197 107561000-107585000 EG - Caltarget 7 99_198 107587000-107589000 EH - Mag Wheelie RA* 99_198 107593000-107598000 EI - LPF Test Global Map (50 in) 99_349 120673000-120673950 EJ - LPF Test Latscans (50-45) 99_349 120674000-120701150 EK - LPF Test Global Map (45 in) 99_349 120701200-120702440 EL - LPF Test Latscans (45-40) 99_349 120702500-120716440 EM - LPF Test Full Nixel Test 99_350 120716600-120719899 EN - LPF Test Global Map (40 in) 99_350 120719900-120721400 EO - LPF Test InGaAs Opt. (40-30) 99_350 120721401-120732400 EP - LPF Test Global Map (30 in) 99_350 120732401-120734000 EQ - LPF Test InGaAs Opt. (30-20) 99_350 120734001-120741000 ER - LPF Test MP Globals (in) 99_350 120741001-120751600 ES - LPF Test Minimum Phase Point 99_350 120751601-120755300 ET - LPF Test Globals (out) 99_350 120755301-120763000 EU - LPF Test Latscans (out) 99_350 120763001-120766400 F - Eros Approach FA - Eros Caltarget A1 00_011 122960800-122963100 FB - LPF Re-Test Global Map (50) 00-019 123686000-123687200 FC - LPF Re-Test Latscans (50-45) 00-019 123687201-123714400 FD - LPF Re-Test Global Map (45) 00-019 123714401-123715600 FE - LPF Re-Test Latscans (45-40) 00-019 123715601-123729700 FF - LPF Re-Test Full Nixel Test 00-019 123729701-123733000 FG - LPF Re-Test Global Map (40) 00-019 123733100-123734500 FH - LPF Re-Test InGaAs Opt.(30) 00-019 123734501-123745170 FI - LPF Re-Test Global Map (30 in) 00-020 123745171-123747000 FJ - LPF Re-Test InGaAs Opt.(20) 00-020 123747001-123753600 FK - LPF Re-Test MP Globals (in) 00-020 123753700-123764800 FL - LPF Re-Test Min. Phase Point 00-020 123764801-123768400 FM - LPF Re-Test - Globals (out) 00-020 123768401-123776000 FN - LPF Re-Test - Latscans (out) 00-020 123776100-123779600 FO - Nixel Raster Tests 00_025 124182100-124216700 FP - Caltarget A2 00_025 124220701-124223100 FQ - MS Light Curve 4* (RA) 00_029 124543900-124564300 FR - Mirror Plane Test (w/MSI) 00_031 124769800-124778000 FS - Mirror Geom 1 (w. MSI) 00_032 124796800-124799700 FT - Mirror Geom 2 (w. MSI) 00_036 125122600-125131000 FU - NIS "Movie" 6* 00_037 125212600-125233000 FV - Caltarget A3 00_038 125317900-125321100 FW - NIS "Movie" 7* 00_041 125584000-125604500 FX - Global Morph 1* + L Curve 8* 00_042 125647600-125687800 FY - NIS MS Rotation 1* 00_043 125725600-125745700 G - Low Phase Flyby GA - Global Map (50 in) 00_044 125835500-125836000 GB - Latitude Scans (50-45 in) 00_044 125836557-125863500 GC - Global Map (45 in) 00_044 125863700-125864400 GD - Latitude Scans (45-40 in) 00_044 125865000-125878600 GE - Full Nixel Test 00_044 125879100-125881825 GF - Global Map (40 in) 00_044 125882400-125883300 GG - InGaAs Opt. Latscan (40-30) 00_044 125883700-125894400 GH - Global Map (30 in) 00_044 125894450-125895900 GI - InGaAs Opt. Latscan (30-20) 00_044-00_045 125896300-125902700 GJ - Minimum Phase Globals (in) 00_045 125903100-125913700 GK - Minimum Phase Point 00_045 125913900-125917200 GL - Globals (out) 00_045 125917550-125920300 H - High Orbit I (370x300 km) HA - Daily Global "46" *** 00_046 126023200-126024300 HB - Daily Global "47" *** 00_047 126077200-126096300 HC - Caltarget O1 00_047 126096400-126099600 HD - NIS Global Morph, 3x3*** 00_047 126103200-126124600 HE - Daily Global "48" *** 00_048 126204900-126206100 HF - Daily Global "49" *** 00_049 126250000-126251100 HG - Daily Global "50" *** 00_050 126343600-126344700 HH - NIS Global Morph 2* 00_050 126360600-126381300 HI - Daily Global "51" *** 00_051 126462400-126463500 HJ - NIS Global Morph 3* 00_052 126518200-126538800 HK - Daily Global "52" *** 00_052 126545100-126546300 HL - Daily Global "53" *** 00_053 126664000-126665100 HM - Daily Global "54" *** 00_054 126678400-126679500 HN - Global Morph 4* 00_054 126708100-126727100 HO - Daily Global "55" *** 00_055 126790900-126792000 I -Transfer to 200 Km Orbit (300x200 km) IA - Daily Global "56" *** 00_056 126865600-126866700 IB - Multispectral Rotation 3* 00_056 126880000-126898300 IC - Daily Global "57" *** 00_057 126970000-126971100 ID - Global Morph 5* 00_058 127022200-127043100 IE - Daily Global "58" *** 00_058 127065500-127066500 IF - Caltarget O2 00_059 127116100-127119300 IG - Daily Global "63" 00_063 127477600-127479000 J - 200 km Orbit JA - Daily Global "65" 00_065 127650400-127651800 JB - Daily Global "66" 00_066 127758400-127759400 JC - NIS Polar Lat 1 00_069 128056500-128072100 JD - NIS Polar Lon 1 00_070 128122000-128141400 JE - NIS Feature Track 1 00_074 128413600-128423500 JF - Caltarget O3 00_074 128434900-128438100 JG - NIS Feature Track 2 00_074 128500600-128510500 JH - NIS Flyover 3* 00_075 128512600-128529700 JI - South Polar Lon 1 00_076 128596900-128616300 JJ - NIS Feature Track 3 00_077 128683600-128688300 JK - NIS Flyover 4 00_079 128845626-128859500 JL - South Polar Lon 2 00_080 128929700-128949100 JM - NIS NPolar Lat 2 00_081 129019100-129035100 JN - NIS SouthPolar_A 00_086 129446200-129525500 JO - NIS SouthPolarLon 00_086 129525400-129541600 JP - NIS Flyover 12 00_088 129617200-129637100 JQ - NIS Flyover 13 00_088 129637600-129703100 JR - NIS Flyover 14, N. Eq. Lon 3 00_089 129703200-129788700 JS - NIS Feature Track 7 00_090 129788800-129807900 JT - NIS Feature Track 8 00_090 129808600-129827700 JU - NIS Flyover 15 00_091 129703200-129896000 JV - NIS Polar Lon 3 00_091 129897400-129917300 JW - NIS Flyover 16 00_092 129960100-129979200 JX - NIS Flyover 17 00_092 129981100-130000200 JY - NIS Flyover 18 00_093 130117900-130137900 K - 200-100 km Transfer KA - NIS Daily Global 95 00_095 130263500-130305699 KB - NIS Equat. Periapsis 00_096 130305700-130434699 KC - NIS Daily Global 97 00_097 130434700-130503399 KD - NIS Daily Global 98 00_098 130503400-130586299 KE - NIS Daily Global 99 00_099 130586300-130695999 KF - NIS Daily Global 100 00_100 130696000-130742799 KG - NIS Daily Global 101 00_101 130742800-130786499 KH - NIS RegGlobal 101 00_101 130786500-130861499 KI - NIS RegGlobal 102 00_102 130861500-130962399 L - 100 km Orbit LA - NIS LonScan 103A 00_103 130962400-130994799 LB - NIS LonScan 104A 00_104 130994800-131017599 LC - NIS LonScan 104B 00_104 131017600-131099099 LD - NIS RegGlobal 105 00_105 131099100-131108099 LE - NIS South 2x3s 105 00_105 131108100-131167499 LF - NIS RegGlobal 106 00_106 131167500-131170499 LG - NIS Feature 2x2 106 00_106 131170500-131221599 LH - NIS LonScan 106A 00_106 131221600-131244999 LI - NIS LonScan 106B 00_106 131245000-131253399 LJ - NIS North 2x3s 107 00_107 131253400-131333999 LK - NIS RegGlobal 107 00_107 131334000-131349000 LL - NIS Feature 2x2 107 00_107-00_108 131335800-131657099 LM - NIS Feature 2x2 111 00_111 131657100-131661399 LN - NIS Lon Scan 111 00_111 131661400-131684099 LO - NIS North 2x3s 111 00_111-00_112 131684100-131706699 LP - NIS Lon Scan 112 00_112 131706700-131771499 LQ - NIS Caltarget O4 00_112-00_113 131771500-131887499 M - 100-50 km Transfer MA - NIS North 2x3s 114 00_114 131887500-131951699 MB - NIS North 2x3s 115 00_115 131951700-131975199 MC - NIS Feature Track 115 00_115 131975200-131979300 MD - NIS RideNLR 116 00_116 132034300-132056399 ME - NIS North 2x3s 116A 00_116 132056400-132068099 MF - NIS North 2x3s 116B 00_116 132068100-132117099 MG - NIS RideNLR 117 00_116-00_117 132117100-132139899 MH - NIS Flyover 117 00_117 132139900-132203399 MI - NIS Feature Track 117 00_117-00_118 132203400-132207699 MJ - NIS LowEmissMaps 118A 00_118 132207700-132213099 MK - NIS LowEmissMaps 118B 00_118 132213100-132219099 ML - NIS LowEmissMaps 118C 00_118 132219100-132226899 MM - NIS RideNLR 118 00_118 132226900-132289299 MN - NIS Feature Track 118 00_118-00_119 132289300-132313299 MO - NIS RideNLR 119 00_119 132313300-132381599 MP - NIS LowEmissMaps 119 00_120 132213100-132399699 MQ - NIS RideNLR 120 00_120 132399700-132462599 MR - NIS North 2x3s 120 00_120-00_121 132462600-132479799 MS - NIS RideNLR 121 00_121 132479800-132548499 MT - NIS Feature Track 121 00_121-00_122 132548500-132572499 MU - NIS RideNLR 122 00_122 132572500-132635799 N - Low Orbit I (50 km) NA - NIS Low Orbit Week 00122 00_123-00_129 132635800-133240699 NB - NIS Low Orbit Week 00129 00_130-00_136 133240700-133664999 _________________________________________________ Notes: DOY is day of year: two digit year followed by Julian day. MET range shows inclusive but not exact bounding times for the sequences in the given subphase. * Number represents MSI observation number. Ex: Light Curve "3" is the first NIS light curve, but the 3rd MSI light curve. ** RA = Ride Along with another instrument. *** Early Daily globals and MSRots have bad command sequences that cause lost and/or contaminated darks.