Gaia Data Release 1 - Cross-match with external catalogues. Algorithm and results

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Volume 607 (November 2017)

A&A, 607 (2017) A105

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Gaia Data Release 1

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Table 2

Properties of Gaia and the external catalogues.

Catalogue	N Sources	PosEr r_maxE ^a	Effective resolution	ICRS offset	EpochDif f_max	SysEr r_max ^b	R_EpochDiff ^c
		(arcsec)	(arcsec)	(mas)	(yr)	(arcsec)	(arcsec)

Gaia DR1	1 142 679 769	0.1	0.1^d	...	N/A	N/A	N/A
UCAC4	113 728 883	2.279^e	~2	...	16.88	0.65	15.155
GSC 2.3	945 592 683	1.6	~4-5^f	280	62.29	2.49	20.958
PPMXL	910 468 710	1.3421^e	~4–5^f	300	15.0	0.60	10.211
SDSS DR9	469 029 929	10.0	~1.4^f	<100	16.29	0.65	53.758
URAT-1	228 276 482	0.429	~5^f	...	2.689	0.11	3.183
2MASS PSC	470 992 970	1.21	5	15	17.57	0.70	10.064
allWISE	747 634 026	35.944	6.1, 6.4, 6.5,12.0^g	...	5.0	0.20	181.220

Notes.

^(a)

PosErr_maxE = max [ max(RAerr_E),max(DECerr_E)], see Sect. 3.1.

^(b)

SysErr_max = PM_refEpochDiff_max/ 5, see Sect. 3.2.

^(c)

R_EpochDiff is defined in Sect. 3.1, Eq. (2).

^(d)

The effective angular resolution on the sky of Gaia DR1, in particular in dense areas, is not yet at this expected level (Arenou et al. 2017).

^(e)

The maximum of position error refers to the propagated errors at J2000.0.

^(f)

Effective resolution value is our best guess.

^(g)

Angular resolution in the four W1–W4 bands, respectively.

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