IRAS Explanatory Supplement
X. The Formats of the IRAS Catalogs and Atlases
B. Point Sources
B.4 Meaning of the Source Association Fields

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Table X.B.4 Meaning of the Source Association Fields

Catalog			Field and Meaning*
1 GCVS	Type		Blank
	Field1 =		Code gives meaning for Fields 2-3
	if Field1	= 1	Field2 and Field3 are B mag [decimag] at max,min
		= 2	Field2 and Field3 are V mag [decimag] at max,min
		= 3	Field2 and Field3 are photographic mag [decimag] at max,min
		= 4	Field2 and Field3 are estimated V mag [decimag] at max,min
		= 5	Field2 is 999 and Field3 is 0
2 Dearborn Obs.	Type		Blank
	Field1		Code for Field2 (1,2)
	Field2		if Field1 is 1, Field2 is red magnitude [decimag]* if field1 is 2, field2 is 999
	Field3		0
3 Revised AFGL	Type		Blank
	Field1		Magnitude at 4.2 µm [decimag]
	Field2		Magnitude at 12 µm [decimag]
	Field3		Magnitude at 25 µm [decimag]
4   2-µm Sky Survey	Type		Blank
	Field1		K magnitude [decimag]
	Field2		I magnitude [decimag]
	Field3		0
5 Globules (Wesselius)	Type		Blank
	Field1		999
	Field2		Minimum diameter [arcsec]
	Field3		Maximum diameter [arcsec]
6 RC2	Type		Blank
	Field1		Harvard V magnitude [decimag]
	Field2		BT [decimag]
	Field3		Do [arcsec]
7 Stars with em. lines	Type		Blank
	Field1		V magnitude [decimag]
	Field2		999
	Field3		0
8 Equatorial IR Cat.	Type		Blank
	Field1		Flux density [10-16 W cm-2 µm-1] at 2.7 µm
	Field2		999
	Field3		0
9 UGC	Type		Blank
	Field1		Zwicky magnitude [decimag]
	Field2		Minimum diameter [arcsec] in B
	Field3		Maximum diameter [arcsec] in B
10 MCG	Type		Blank
	Field1		999
	Field2		Minimum diameter [arcsec] in B
	Field3		Maximum diameter [arcsec] in B
11 Strasbourg Planetary Nebulae	Type		Blank
	Field1		V magnitude of Nebula [decimag]
	Field2		B magnitude of Center Star [decimag]
	Field3		Minimum diameter of Nebula [arcsec]
12 Zwicky	Type		Blank
	Field1		Zwicky magnitude [decimag]
	Field2		999
	Field3		0
13 SAO	Type		Spectral Type
	Field1		V magnitude [decimag]
	Field2		p g magnitude [decimag]
	Field3		0
14 ESO/UPPSALA	Type		First 3 characters of object type
	Field1		B magnitude [decimag]
	Field2		Maximum diameter [arcsec]
	Field3		Minimum diameter [arcsec]
15 Bright Stars	Type		Spectral Type
	Field1		V magnitude [decimag]
	Field2		B-V [centimag]
	Field3		U-B [centimag]
16 Suspected Var.	Type		Spectral Information
	Field1		V magnitude at maximum [decimag]
	Field2		999
	Field3		0
17 Carbon Stars	Type		Spectral Type (May be truncated)
	Field1		p g magnitude [decimag]
	Field2		V magnitude [decimag]
	Field3		I magnitude [decimag]
18 Gliese	Type		Spectral Type (May be truncated)
	Field1		V magnitude [decimag]
	Field2		B-V magnitude [millimag]
	Field3		U-B magnitude [millimag]
19 S Stars	Type		Blank
	Field1		p g magnitude [millimag]
	Field2		V magnitude [decimag]
	Field3		I magnitude [decimag]
20 Parkes HII Survey	Type		Blank
	Field1		999
	Field2		Minimum diameter [arcsec]
	Field3		Maximum diameter [arcsec]
21 Bonn HII Survey	Type		Blank
	Field1		Flux density at 4.875 GHz (Jy)
	Field2		Diameter [arcsec]
	Field3		0
22 Blitz	Type		Blank
	Field1		Diameter [arcsec]
	Field2		Vco [Km/s]
	Field3		Peak TA [K]
23 OSU	Type		Blank
	Field1		999
	Field2		999
	Field3		Diameter [arcsec]
24 IRC	Type		C if 2.2 µm sources are possibly confused, w/good pos. blank otherwise
	Field1		Right ascension difference (IRC-IRAS) [deciseconds of time]
	Field2		Declination difference (IRC-IRAS) [seconds of time]
	Field3		0
25 DDO	Type		Blank
	Field1		999
	Field 2		999
	Field3		0
26 Arp	Type		Blank
	Field1		999
	Field2		999
	Field		0
27 Markarian	Type		Blank
	Field1		999
	Field2		999
	Field3		0
28 Strong 5 GHz	Type		Object type (GAL or QSO)
	Field1		V magnitude [decimag]
	Field2		5 GHz flux density [deciJy]
	Field3		0
29 Veron-Veron	Type		Object classification
	Field1		V magnitude [decimag]
	Field2		Redshift × 1000
	Field3		0
30 Zwicky 8 Lists	Type		Blank
	Field1		999
	Field2		999
	Field3		0
31 VV	Type		Blank
	Field1		Special flag, (see below) 999 otherwise
	Field2		999
	Field3		0
* In the printed version FIELD1 is listed if present except for catalogs 2 and 19, where FIELD2 is given.

VV Catalog Flags (Catalog 31)

Field1	Explanation
10	VV10 has the same coordinates as VV 29 in the VV Atlas. The UGC was used to confirm that the coordinate is correct for VV 29 and erroneous for VV 10. The UGC position for VV 10 = UGC 10814 was adopted.
11	The VV position is substantially different (>400") from positions for the object in other catalogs. The VV position has been assumed to be in error because two or more other catalogs agree on a different position. The UGC position has been adopted.
12	Same as for 11, but the OSU position has been adopted.
13	The position in the VV Atlas, and the position listed for the VV objest in the OSU are in disagreement. The true position has been established to be close to that of the OSU by the use of overlay transparencies on the POSS, The OSU position has been adopted.
14	Same as for 13, but the OSU position is not very good either, so a new position has been measured (accurate to about 1').

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