Format of the Minor Planet Survey Database

[Adapted from the ADC on-line documentation.]

Final Product # 101: IMPS Final Product Formats Database

This lists formats of all the machine-readable IMPS final products including this one, # 101, but excluding the hard copy catalog, # 100. Short descriptions of each field as well as individual introductions to each table are included.

Definition of format for IMPS Final Product # 101:

    Title   --   IMPS Formats Catalog 
    Header  --   Parameter, Format, Unit, Remark 
    List    --   Parameters, PC code formats, units and remarks

Note: For asteroid type = 1, asteroid identification number < 4680
      For asteroid type = 2, asteroid identification number < 2633

Final Product # 102: IMPS Albedos and Diameters Database

A summary of the averaged results for 1,796 numbered asteroids and 88 Type-2 asteroids which have at least two final accepted band observations used. The results are collated by asteroid in ascending numerical order for types 1 and 2. Entries include: asteroid type, identification number, name or provisional designation for type 1 and provisional designation for type 2, absolute magnitude, number of sightings used, best values for averaged derived albedo and diameter together with the one sigma uncertainty for each, the probability that an intrisic flux variation ("lightcurve") influenced the results, the number of sightings (i.e., detected crossings of the IRAS focal plane), the number of fluxes ("observations") averaged, the fraction-observed ratio (i.e., the ratio of the total number of times the asteroid was predicted to cross the IRAS focal plane versus the actual number of crossings realized), and the 32-bit asteroid status word (ASTATW).

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-23   A16    ---    Name      IAU designation
 24-28   F5.2   mag    Mv        absolute visual magnitude
 29-34   F6.4   ---    PHMean    mean visual albedo on the H, G system
 35-39   F5.3   ---    u_PHMean  1 sigma pH uncertainty
 40-46   F7.2   km     DiaMean   mean diameter
 47-52   F6.1   ---    u_DiaMean 1 sigma diameter uncertainty
 53-56   F4.2   ---    ProbLtCurv probability of lightcurve effects
 57-58   I2     ---    NUseSight number of used sightings
 59-60   I2     ---    NUseObs   number of used observations (all bands)
 61-64   F4.2   ---    ratio     fraction-observed ratio
 65-96   A32    ---    AStatW    Or'd accepted status word bits
-------------------------------------------------------------------------

Final Product # 103: IMPS Singleton Database

A summary of the results for 94 numbered asteroids and 26 Type-2 asteroids which have only one final accepted band observation used. The format is the same used for # 102. The results are collated by asteroid in ascending numerical order for types 1 and 2. Entries include: asteroid type, identification number, name or provisional designation for type 1 and provisional designation for type 2, absolute magnitude, number of sightings used, best values for averaged derived albedo and diameter together with the one sigma uncertainty for each, the probability that an intrisic flux variation ("lightcurve") influenced the results, the number of sightings (i.e., detected crossings of the IRAS focal plane), the number of fluxes ("observations") averaged, the fraction-observed ratio (i.e., the ratio of the total number of times the asteroid was predicted to cross the IRAS focal plane versus the actual number of crossings realized), and the 32-bit asteroid status word (ASTATW). Because this format is identical to that for FP102, some counters can, and do, only have values of zero (e.g., ProbLtCurv) or unity (e.g., NUseSight and NUseObs).

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-23   A16    ---    Name      IAU designation
 24-28   F5.2   mag    Mv        absolute visual magnitude
 29-34   F6.4   ---    PHMean    mean visual albedo on the H, G system
 35-39   F5.3   ---    u_PHMean  1 sigma pH uncertainty
 40-46   F7.2   km     DiaMean   mean diameter
 47-52   F6.1   ---    u_DiaMean 1 sigma diameter uncertainty
 53-56   F4.2   ---    ProbLtCurv probability of lightcurve effects
 57-58   I2     ---    NUseSight number of used sightings
 59-60   I2     ---    NUseObs   number of used observations (all bands)
 61-64   F4.2   ---    ratio     fraction-observed ratio
 65-96   A32    ---    AStatW    Or'd accepted status word bits
-------------------------------------------------------------------------

Final Product # 104: IMPS Statistics Database

Summary of the number of times each asteroid was sighted, the number of times it was predicted to be scanned, and possible reasons for any failure to be detected. There is an entry for each of 4,679 numbered asteroids and 2,632 Type-2 asteroids (including those for which no IMPS sightings exist) collated by asteroid in ascending numerical order for types 1 and 2. Entries include: asteroid type, identification number, number of predicted sightings, number of accepted sightings, number of rejected sightings, number of missed predicted sightings, number of missed predicted faint sightings, number of dead 25 micron detector non-detections, number of noisy 25 micron detector non-detec- tions, number of missed predictions in the Galactic center region, and other non-detections.

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-9    I2     ---    Psight    predicted sightings
 10-11   I2     ---    Asight    accepted sightings
 12-13   I2     ---    Rsight    rejected sightings
 14-15   I2     ---    Msight    missed predicted sightings
 16-17   I2     ---    Fsight    too faint to expect a detection
 18-19   I2     ---    Dsight    dead 25 micron detector non-detections
 20-21   I2     ---    Nsight    noisy 25 micron detector non-detections
 22-23   I2     ---    Gsight    Galactic center matches
 24-25   I2     ---    Osight    other non-detections
-------------------------------------------------------------------------

Final Product # 105: IMPS Reject Database

Summary of the number of rejected sightings for each asteroid and possible reasons for rejection. There is an entry for each of 1,732 numbered asteroids and 655 Type-2 asteroids for which at least one sighting was rejected, col- lated by asteroid in ascending numerical order for types 1 and 2. Entries include: asteroid type, identification number, number of rejected sightings, number of weeks-confirmed (MCON) sightings, number of sightings confused with sources in the IRAS Point Source Catalog (PSC) Version 2, number of sightings whose detectors were all outer slots only (i.e., at the edge of the survey array), number of sightings confused with sources in the IRAS Faint Source Catalog (FSC) Version 2, number of sightings confused with sources in the IRAS Serendipitous Survey Catalog (SSC), number of times more than one source was associated with a single asteroid prediction, number of sightings with posi- tion match scores below the final threshold, 0.4 (these sightings are a subset of those with AStatW bit number 1 set), number of sightings detected only at 25 microns with flux status less than 5 (i.e., not fully seconds-confirmed), number of singletons with flux status less than 5, number of sightings with uniform cross-scan uncertainties above 5 arcmin, number of times the color test failed, number of sightings with at least one band having an unacceptable confusion status, number of sightings in which at least one band had an unnacceptably low detection correlation coefficient, number of rejected sightings in which the low-albedo test failed in at least one band, number of rejected sightings in which an albedo solution failed to converge in at least one band, and the number of rejected sightings in which an albedo was rejected from the final average by the Chauvenet criterion in at least one band.

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-9    I2     ---    Rsight    rejected sightings
 10-11   I2     ---    Wsight    WCON sightings       (AStatW bit # 5)
 12-13   I2     ---    PSCsight  PSC matches          (AStatW bit # 9)
 14-15   I2     ---    Osight    outer slots only     (AStatW bit # 10)
 16-17   I2     ---    FSCsight  FSC matches          (AStatW bit # 17)
 18-19   I2     ---    SSCsight  SSC matches          (AStatW bit # 20)
 20-21   I2     ---    Tsight    2+ sightings matches (AStatW bit # 31)
 22-23   I2     ---    Lsight    low position-match score
 24-25   I2     ---    B2sight   band-2-only with flux status < 5
 26-27   I2     ---    Ssight    singletons with flux status < 5
 28-29   I2     ---    CSsight   cross-scan uncertainty > 5 arcmin
 30-31   I2     ---    Cfail     color failures
 32-33   I2     ---    Qsight    confusion status failures
 34-35   I2     ---    CCfail    correlation coefficient failures
 36-37   I2     ---    Lalbedo   low albedos  (< 0.01)
 38-39   I2     ---    NCalbedo  albedo solutions not converged
 40-41   I2     ---    Ealbedo   albedo eliminated by Chauvenet criterion
-------------------------------------------------------------------------

Final Product # 106: IMPS Missed-Predictions Database

Summary of the always-missed asteroids. The entries are collated by predicted asteroid in ascending numerical order for types 1 and 2. Entries include the asteroid type, identification number, number of times predicted to be scanned but missed, and the derived greatest lower limit on the albedo range and least upper limit on the diameter range for each asteroid plus the analogous OR'd AStatW status word. There is an entry for each of 1,653 numbered asteroids and 1,765 Type-2 asteroids which were scanned but did not generate any IMPS aster- oid associations. Entries include: asteroid type, number, name or provisional designation for type 1 and provisional designation for type 2, number of missed predicted scans, H, G, estimated visual albedo and diameter, the greatest lower bound on the albedo, the least upper bound on the diameter and the OR'd predic- tion status word.

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-23   A16    ---    IAUName   IAU designation
 24-25   I2     ---    NMiss     no. of missed predicted scans
 26-30   F5.2   mag    Mv        absolute visual magnitude
 31-36   F6.3   ---    slope     slope parameter
 37-42   F6.4   ---    AlbEst    visual albedo estimate
 43-49   F7.2   km     DiaMst    diameter estimate
 50-55   F6.4   ---    AlbGLB    greatest lower albedo limit
 56-62   F7.2   km     DiamLUB   least upper diameter limit
 63-94   A32    ---    PStatW    OR'd prediction status word bits
-------------------------------------------------------------------------

Final Product # 107: IMPS Ground-Based Data Database

A listing of ground-based and IRAS Asteroid and Comet Survey data used to reduce the IMPS observations. There is an entry for each of 4,679 numbered asteroids and 2,632 Type-2 asteroids (including those for which no IMPS sightings exist) collated by asteroid in ascending numerical order for types 1 and 2. Entries include: asteroid type, identification number, name or provisional designation for type 1 and provisional designation for type 2, H, G, the estimated (0.01 default) geometric visual albedo, the estimated diameter, the adopted taxonomic classification and the orbital elements at three epochs (time of perihelion passage, mean anomaly, argument of perihelion, longitude of ascending node, inclination, eccentricity and perihelion distance; the Julian dates of the epochs are 2445400.5, 2445500.5, and 2445600.5).

Because the total number of columns of data exceeds 255, Final Product # 107 is broken up into four files named FP107.A, FP107.B, FP107.C, and FP107.D, with the formats given below.

FP107.A Formats

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-23   A16    ---    IAUName   IAU designation
 24-28   F5.2   mag    Mv        absolute visual magnitude
 29-34   F6.3   ---    slope     slope parameter
 35-40   F6.4   ---    AlbEst    estimated visual albedo (0.01 default)
 41-47   F7.2   km     DiaMst    diameter estimate
 48-50   A3     ---    TClass    taxonomic classification
-------------------------------------------------------------------------

FP107.B, FP107.C, and FP107.D Formats
(The lower case "n" in the parameter name is 1, 2, and 3 for FP107B, FP107.C, and FP107.D, respectively; these three files have identical formats and correspond to the three different epochs mentioned above.)

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-21   F14.5  d      PJD       time (Julian Date) of perihelion passage
 22-32   F11.5  deg    Mn        mean anomaly
 33-43   F11.5  deg    APn       argument of perihelion
 44-54   F11.5  deg    LAn       longitude of ascending node
 55-65   F11.5  deg    In        inclination
 66-74   F9.6   ---    En        eccentricity
 75-83   F9.6   AU     PDnAU     perihelion distance
 84-92   F9.6   AU     An        semimajor axis
-------------------------------------------------------------------------

Final Product # 108: IMPS Sightings Database

A listing of 7,937 accepted sightings associated with 1,890 numbered asteroids and 273 accepted sightings associated with 114 Type-2 asteroids. The sightings are collated by asteroid in ascending numerical order for types 1 and 2. Entries include: asteroid type, identification number, date and UT of the observation, the IRAS sighting time tag, SOP and OBS numbers, the IRAS-derived observed right ascension and declination, twist angle, ecliptic longitude and latitude, Galactic longitude and latitude positions, heliocentric distance, geocentric distance, phase angle, predicted right ascension and declination position, predicted apparent visual magnitude, the derived albedo and diameter in each of the four IRAS bands along with their one-sigma uncertainties, in and cross-scan uncertainties and cross-scan uncertainty half-width, the position match score, the difference between the predicted and observed position, the factor used to correct for low flux over-estimation, the predicted flux density, the flux density observed (INCLUDING the low flux over-estimation correction), the flux density sigma, the signal to noise ratio, the detector ID array, the correlation coefficients, the derived status word, the confusion status word, the flux status, and the sighting status word.

Because the total number of columns of data exceeds 255, Final Product # 108 is broken up into three files named FP108.A, FP108.B, and FP108.C, with the formats given below.

FP108.A Formats

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-9    I2     ---    ObsMonth  month of observation (year 1983)
 10-11   I2     ---    ObsDay    day of month of observation
 12-13   I2     h      ObsHour   hour of observation (UTC)
 14-15   I2     min    ObsMin    minute of observation (UTC)
 16-17   I2     s      ObsSec    second of observation (UTC)
 18-26   I9     0.1s   AstNam    sighting time tag
 27-29   I3     ---    SOP       SOP number
 30-31   I2     ---    OBS       OBS number
 32-33   I2     h      RAh       right ascension (observed)
 34-35   I2     min    RAm       RA minute
 36-39   F4.1   s      RAs       [0/60] RA sec
 40      A1     ---    DE-       sign of declination
 41-42   I2     deg    DEd       declination (observed) degrees
 43-44   I2     arcmin DEm       DEC minutes
 45-46   I2     arcsec DEs       [0/60] DEC seconds
 47-51   F5.1   deg    AstGaC    celestial twist angle
 52-59   F8.4   deg    ELong     ecliptic longitude
 60-67   F8.4   deg    ELat      ecliptic latitude
 68-75   F8.4   deg    GLong     Galactic longitude
 76-83   F8.4   deg    GLat      Galactic latitude
 84-89   F6.3   AU     Hdist     heliocentric distance
 90-95   F6.3   AU     Gdist     geocentric distance
 96-102  F7.2   deg    PrdAlp    phase angle (negative before opp.)
103-104  I2     h      PRAh      right ascension (predicted)
105-106  I2     min    PRAm      RA minute   "
107-110  F4.1   s      PRAs      RA  sec     "
111-113  I3     deg    PDEd      declination (predicted)
114-115  I2     m      PDEm      DEC minute      "
116-117  I2     s      PDEs      DEC  second      "
118-122  F5.2   mag    V         apparent visual magnitude
123-146  4F6.4  ---    Albedo    derived visual albedo (four bands)
147-170  4F6.4  ---    u_Albedo  1-sigma uncertainties in Albedo
171-198  4F7.2  km     Diam      diameter (four bands)
199-226  4F7.2  ---    u_Diam    1-sigma uncertainties in Diam
-------------------------------------------------------------------------

FP108.B Formats

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-9    I2     ---    ObsMonth  month of observation (year 1983)
 10-11   I2     ---    ObsDay    day of month of observation
 12-13   I2     h      ObsHour   hour of observation (UTC)
 14-15   I2     min    ObsMin    minute of observation (UTC)
 16-17   I2     s      ObsSec    second of observation (UTC)
 18-22   F5.3   arcmin AstSgY    one sigma in scan uncertainty
 23-27   F5.3   arcmin AstSgZ    one sigma cross scan uncertainty
 28-33   F6.3   arcmin AstLZ     cross scan uncertainty half width
 34-38   F5.3   ---    Score     position match score
 39-45   F7.1   arcsec PosDiff   position difference |pred - obs|
 46-65   4F5.3  ---    FCorr     low flux correction factor (four bands)
 66-93   4F7.3  Jy     PrdFlx    predicted flux density (four bands)
 94-125  4F8.3  Jy     AstFlx    observed flux density (four bands)
126-157  4F8.3  Jy     AstSgF    flux density sigma (four bands)
158-185  4F7.2  ---    AstSNR    signal to noise ratio (four bands)
-------------------------------------------------------------------------

FP108.C Formats

  Bytes  Format Units  Label     Explanations
-------------------------------------------------------------------------
  1-2    I2     ---    AstTyp    asteroid type
  3-7    I5     ---    AstID     asteroid identification number
  8-9    I2     ---    ObsMonth  month of observation (year 1983)
 10-11   I2     ---    ObsDay    day of month of observation
 12-13   I2     h      ObsHour   hour of observation (UTC)
 14-15   I2     min    ObsMin    minute of observation (UTC)
 16-17   I2     s      ObsSec    second of observation (UTC)
 18-37   4I5    ---    AstDts    detector id array (four bands)
 38-49   4I3    ---    AstCor    correlation coefficients (four bands)
 50-81   4I8    ---    ADStat    derived status word (four bands) bits
 82-113  4I8    ---    AstCSt    confusion status word (four bands) bits
114-117  4I1    ---    AstFSt    flux status word (four bands)
118-149  A32    ---    AStatW    sighting status word bits
-------------------------------------------------------------------------