II/190 IRAS Minor Planet Survey (IMPS) (Tedesco 1992)
The IRAS Minor Planet Survey (IMPS) Data Base
Tedesco E.F. (ed.)
<Phillips Laboratory, Technical Report No. PL-TR-92-2049.
Hanscom Air Force Base, MA (1992)>
ADC_Keywords: Minor planets ; Photometry, infrared
Mission_Name: IRAS
Description:
The IRAS Minor Planet Survey (1992) supplements the asteroid data
given in the IRAS Asteroid and Comet Survey (1986; catalog VII/91);
comets are not included in IMPS. All asteroids with reasonably
well-known orbits as of December 1990 are covered. In particular,
IMPS updates the processing of asteroids numbered 1 through 3318 and
extends this processing to asteroid number 4679 plus 2,632 asteroids
with preliminary (two or more opposition) orbits. IMPS processed only
IRAS survey observations; Low Resolution Spectrometer, Serendipitous,
and Additional Observations data were not processed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fp102.dat 96 1884 *IMPS Albedos and Diameters Data Base
fp103.dat 96 120 *IMPS Singleton Data Base
fp104.dat 25 7311 *IMPS Statistics Data Base
fp105.dat 41 2387 *IMPS Reject Data Base
fp106.dat 94 3418 *IMPS Missed-Predictions Data Base
fp107a.dat 50 7311 *IMPS Ground-Based Data Data Base (first part)
fp107b.dat 92 7311 *IMPS Ground-Based Data Data Base (second part)
fp107c.dat 92 7311 *IMPS Ground-Based Data Data Base (third part)
fp107d.dat 92 7311 *IMPS Ground-Based Data Data Base (fourth part)
fp108a.dat 226 8210 *IMPS Sightings Data Base (first part)
fp108b.dat 185 8210 *IMPS Sightings Data Base (second part)
fp108c.dat 149 8210 *IMPS Sightings Data Base (third part)
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Notes on fp102.dat:
This data contains IMPS Albedos and Diameters Data Base. A distilled
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 intrinsic 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).
(Note: For asteroid type = 1, asteroid identification number < 4680
For asteroid type = 2, asteroid identification number < 2633)
Note on fp103.dat:
This data contains IMPS Singleton Data Base. A distilled 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 f102. 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 intrinsic 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., Prob)
or unity (e.g., NSight and NObs).
Note on fp104.dat:
This data contains IMPS Statistics Data Base. 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-detections,
number of missed predictions in the galactic center region, and other
non-detections.
Notes on fp105.dat:
This data contains IMPS Reject Data Base. 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,
collated 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 (WCON) 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 position 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 unacceptably 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.
Notes on fp106.dat:
This data contains IMPS Missed-Predictions Data Base. 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 asteroid
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 prediction status word.
Notes on fp107a.dat, fp107b.dat, fp107c.dat, fp107d.dat:
This data contains IMPS Ground-Based Data Data Base, A listing of
ground-based and IRAS Asteroid and Comet Survey Catalog (1986) 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).
Notes on fp108a.dat, fp108b.dat, fp108c.dat:
These data sets contain IMPS Sightings Data Base. 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 data product
108 is broken up into three files named fp108a, fp108b, and fp108c.
with the formats given above.
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See also:
VII/91 : The IRAS asteroid and comet survey (Joint IRAS Science WG, 1986)
Byte-by-byte Description of file: fp102.dat fp103.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 23 A16 --- Name IAU designation
24- 28 F5.2 mag Hmag Absolute visual magnitude
29- 34 F6.4 --- PH Mean visual albedo on the H, G system
35- 39 F5.3 --- e_PH rms uncertainty on PH
41- 46 F6.2 km Diam Mean diameter
49- 52 F4.1 km e_Diam rms uncertainty on Diam
53- 56 F4.2 % Prob Probability of lightcurve effects
57- 58 I2 --- NSight Number of used sightings (detected crossings
of the IRAS focal plane)
59- 60 I2 --- NObs Number of used observations (all bands)
61- 64 F4.2 --- FOR Fraction-observed ratio (ratio of the total
number of times the asteroid was predicted to
cross the IRAS focal plane versus the actual
number of crossings realized)
65- 96 32A1 --- AStatW [1.] Or'd accepted status word bits
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Byte-by-byte Description of file: fp104.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 9 I2 --- Pred Predicted sightings
10- 11 I2 --- Sight Accepted sightings
12- 13 I2 --- Reject Rejected sightings
14- 15 I2 --- Missed Missed predicted sightings
16- 17 I2 --- Faint Too faint to expect a detection
18- 19 I2 --- Dead Dead 25 micron detector non-detections
20- 21 I2 --- Noisy Noisy 25 micron detector non-detections
23 I1 --- GCMatches Galactic center matches
24- 25 I2 --- X Other non-detections
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Byte-by-byte Description of file: fp105.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
9 I1 --- Rej Number of rejected sightings
11 I1 --- MCON Number of weeks-confirmed (MCON) sightings
(AStatW bit # 5)
13 I1 --- PSC Number of sightings confused with sources in
the IRAS Point Source Catalog (PSC) Version 2
(AStatW bit # 9)
15 I1 --- nOut Number of sightings whose detectors were all
outer slots only (i.e., at the edge of the
survey array) (AStatW bit # 10)
17 I1 --- FSC Number of sightings confused with sources in
the IRAS Faint Source Catalog (FSC) Version 2
(AStatW bit # 17)
19 I1 --- SSC Number of sightings confused with sources in
the IRAS Serendipitous Survey Catalog (SSC)
(AStatW bit # 20)
21 I1 --- I Number of times more than one source was
associated with a single asteroid prediction
(AStatW bit # 31)
23 I1 --- L Number of sightings with position match scores
below the final threshold, 0.4 (these
sightings are a subset of those with AStatW
bit number 1 set)
25 I1 --- B Number of sightings detected only at 25microns
with flux status < 5 (i.e., not fully
seconds-confirmed)
27 I1 --- Z Number of singletons with flux status < 5
29 I1 --- U Number of sightings with uniform cross-scan
uncertainty > 5 arcmin
31 I1 --- C Number of times the color test failed
33 I1 --- Q Number of sightings with at least one band
having an unacceptable confusion status
35 I1 --- D Number of sightings in which at least one band
had an unacceptably low detection
correlation coefficient
37 I1 --- A Number of rejected sightings in which the low
albedo test failed in at least one band (<0.01)
39 I1 --- N Number of rejected sightings in which an albedo
solution failed to converge in at least one band
41 I1 --- E Number of rejected sightings in which an albedo
was rejected from the final average by the
Chauvenet criterion in at least one band
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Byte-by-byte Description of file: fp106.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 23 A16 --- Name IAU designation
24- 25 I2 --- Nmiss Nunber of missed predicted scans
26- 30 F5.2 mag Hmag Absolute visual magnitude
31- 36 F6.3 --- G Slope parameter
37- 42 F6.4 --- Alb Visual albedo estimate
43- 49 F7.2 km Diam Diameter estimate
50- 55 F6.4 --- AlbGLB Greatest lower albedo limit
56- 62 F7.2 km DiamLUB Least upper diameter limit
63- 94 32I1 --- PStatW OR'd prediction status word bits
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Byte-by-byte Description of file: fp107a.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 23 A16 --- Name IAU designation
24- 28 F5.2 mag Hmag Absolute visual magnitude
29- 34 F6.3 --- G Slope parameter
35- 40 F6.4 --- Alb Estimated visual albedo (0.01 default)
42- 47 F6.2 km Diam Estimated diameter
48- 50 A3 --- Class Classification
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Byte-by-byte Description of file: fp107b.dat fp107c.dat fp107d.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
9- 21 F13.5 d T time of perihelion passage
24- 32 F9.5 deg M Mean anomaly
35- 43 F9.5 deg omega Argument of perihelion
46- 54 F9.5 deg OMEGA Longitude of ascending node
58- 65 F8.5 deg I Inclination
67- 74 F8.6 --- E Eccentricity
76- 83 F8.6 AU Dper Perihelion distance
84- 92 F9.6 AU a Semimajor axis
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Byte-by-byte Description of file: fp108a.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 9 I2 "month" OBS.M Month of observation (year 1983)
10- 11 I2 d OBS.D Day of month of observation
12- 13 I2 h OBS.h Hour of observation (UTC)
14- 15 I2 min OBS.m Minute of observation (UTC)
16- 17 I2 s OBS.s Second of observation (UTC)
18- 26 I9 0.1s Nam IRAS sighting time tag
27- 29 I3 --- SOP SOP number
30- 31 I2 --- OBSno OBS number
32- 33 I2 h RAh Right ascension 1983 (at equinox of observed
date)
34- 35 I2 min RAm Right ascension (observed)
36- 39 F4.1 s RAs [0,60.0] Right ascension (observed)
40 A1 --- DE- Declination sign
41- 42 I2 deg DEd Declination (at equinox of observed date)
43- 44 I2 arcmin DEm Declination (observed)
45- 46 I2 arcsec DEs [0,60] Declination (observed)
47- 51 F5.1 deg GaC Celestial twist angle
52- 59 F8.4 deg ELON Ecliptic longitude
60- 67 F8.4 deg ELAT Ecliptic latitude
68- 75 F8.4 deg GLON Galactic longitude
76- 83 F8.4 deg GLAT Galactic latitude
85- 89 F5.3 AU DistH Heliocentric distance
91- 95 F5.3 AU DistG Geocentric distance
97-102 F6.2 deg PhA Phase angle (negative before opp.)
103-104 I2 h RAPh Right ascension (1983, predicted)
105-106 I2 min RAPm Right ascension (predicted)
107-110 F4.1 s RAPs [0,60.0] Right ascension (predicted)
111 A1 --- DEP- Declination sign
112-113 I2 deg DEPd Declination (predicted)
114-115 I2 arcmin DEPm Declination (predicted)
116-117 I2 arcsec DEPs [0,60] Declination (predicted)
118-122 F5.2 mag Vmag Predicited apparent visual magnitude
123-128 F6.4 --- Alb1 Derived visual albedo (first IRAS band)
129-134 F6.4 --- Alb2 Derived visual albedo (second IRAS band)
135-140 F6.4 --- Alb3 Derived visual albedo (third IRAS band)
141-146 F6.4 --- Alb4 Derived visual albedo (fourth IRAS band)
147-152 F6.4 --- e_Alb1 1-sigma uncertainty in Alb1
153-158 F6.4 --- e_Alb2 1-sigma uncertainty in Alb2
159-164 F6.4 --- e_Alb3 1-sigma uncertainty in Alb3
165-170 F6.4 --- e_Alb4 1-sigma uncertainty in Alb4
171-177 F7.2 km Diam1 Derived diameter (first IRAS band)
179-184 F6.2 km Diam2 Derived diameter (second IRAS band)
186-191 F6.2 km Diam3 Derived diameter (third IRAS band)
192-198 F7.2 km Diam4 Derived diameter (fourth IRAS band)
201-205 F5.2 km e_Diam1 1-sigma uncertainties in Diam1
208-212 F5.2 km e_Diam2 1-sigma uncertainties in Diam2
215-219 F5.2 km e_Diam3 1-sigma uncertainties in Diam3
221-226 F6.2 km e_Diam4 1-sigma uncertainties in Diam4
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Byte-by-byte Description of file: fp108b.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 9 I2 "month" OBS.M Month of observation (year 1983)
10- 11 I2 d OBS.D Day of month of observation
12- 13 I2 h OBS.h Hour of observation (UTC)
14- 15 I2 min OBS.m Minute of observation (UTC)
16- 17 I2 s OBS.s Second of observation (UTC)
18- 22 F5.3 arcmin SgY One sigma in scan uncertainty
23- 27 F5.3 arcmin SgZ One sigma cross scan uncertainty
29- 33 F5.3 arcmin LZ Cross scan uncertainty half width
34- 38 F5.3 --- Score Position match score
41- 45 F5.1 arcsec PosDiff Position difference |pred - obs|
46- 50 F5.3 ---- FCorr1 Low flux correction factor (first IRAS band)
51- 55 F5.3 ---- FCorr2 Low flux correction factor (second IRAS band)
56- 60 F5.3 ---- FCorr3 Low flux correction factor (third IRAS band)
61- 65 F5.3 ---- FCorr4 Low flux correction factor (fourth IRAS band)
66- 72 F7.3 Jy SP1 Predicted flux density (first IRAS band, 12um)
73- 79 F7.3 Jy SP2 Predicted flux density (second IRAS band, 25um)
80- 86 F7.3 Jy SP3 Predicted flux density (third IRAS band, 60um)
87- 93 F7.3 Jy SP4 Predicted flux density (fourth IRAS band, 100um)
95-101 F7.3 Jy SO1 Observed flux density (first IRAS band)
103-109 F7.3 Jy SO2 Observed flux density (second IRAS band)
111-117 F7.3 Jy SO3 Observed flux density (third IRAS band)
119-125 F7.3 Jy SO4 Observed flux density (fourth IRAS band)
128-133 F6.3 Jy e_SO1 rms uncertainty on SO1 (first IRAS band)
136-141 F6.3 Jy e_SO2 rms uncertainty on SO2 (second IRAS band)
144-149 F6.3 Jy e_SO3 rms uncertainty on SO3 (third IRAS band)
152-157 F6.3 Jy e_SO4 rms uncertainty on SO4 (fourth IRAS band)
158-164 F7.2 --- SNR1 Signal to noise ratio (first IRAS band)
165-171 F7.2 --- SNR2 Signal to noise ratio (second IRAS band)
172-178 F7.2 --- SNR3 Signal to noise ratio (third IRAS band)
179-185 F7.2 --- SNR4 Signal to noise ratio (fourth IRAS band)
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Byte-by-byte Description of file: fp108c.dat
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Bytes Format Units Label Explanations
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2 I1 --- Type Asteroid type
4- 7 I4 --- ID Asteroid identification number
8- 9 I2 "month" OBS.M Month of observation (year 1983)
10- 11 I2 d OBS.D Day of month of observation
12- 13 I2 h OBS.h Hour of observation (UTC)
14- 15 I2 min OBS.m Minute of observation (UTC)
16- 17 I2 s OBS.s Second of observation (UTC)
19- 22 I4 --- Dtc1 Detector ID array (first IRAS band)
24- 27 I4 --- Dtc2 Detector ID array (second IRAS band)
29- 32 I4 --- Dtc3 Detector ID array (third IRAS band)
34- 37 I4 --- Dtc4 Detector ID array (fourth IRAS band)
38- 40 I3 --- Cor1 Correlation coefficients (first IRAS band)
41- 43 I3 --- Cor2 Correlation coefficients (second IRAS band)
44- 46 I3 --- Cor3 Correlation coefficients (third IRAS band)
47- 49 I3 --- Cor4 Correlation coefficients (fourth IRAS band)
50- 57 I8 --- ADStat1 Derived status word (first IRAS band) bits
58- 65 I8 --- ADStat2 Derived status word (second IRAS band) bits
66- 73 I8 --- ADStat3 Derived status word (third IRAS band) bits
74- 81 I8 --- ADStat4 Derived status word (fourth IRAS band) bits
82- 89 I8 --- CStat1 Confusion status word (first IRAS band) bits
90- 97 I8 --- CStat2 Confusion status word (second IRAS band) bits
98-105 I8 --- CStat3 Confusion status word (third IRAS band) bits
106-113 I8 --- CStat4 Confusion status word (fourth IRAS band) bits
114 I1 --- FStat1 Flux status word (first IRAS band)
115 I1 --- FStat2 Flux status word (second IRAS band)
116 I1 --- FStat3 Flux status word (third IRAS band)
117 I1 --- FStat4 flux status word (fourth IRAS band)
118-149 32I1 --- AStatW Sighting status word bits
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Historical Notes:
12-Nov-1994 : Documentation prepared at CDS by Patricia Bauer
10-Jun-1995 : The catalog's original ADC documentation was
scanned and included in the ReadMe file by
C.-H. Joseph Lyu [Hughes STX/NASA]
(End) C.-H. Joseph Lyu [Hughes STX/NASA] 10-Jun-1995