Systematics of planetary ephemeris reference frames inferred from pulsar timing astrometry

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Table 2

Astrometric precision of the timing solutions based on different PTA data sets using DE440.

PTA	Subset	Pos. Epoch	Nb. PSR		σ_δ (µas)
PPTA DR2e	All	2011.8	24	47	89	12	22
	\|β\| ≤ 10°	2011.3	4	101	1469	29	427
	\|β\| > 10°	2012.0	20	40	74	9	16
EPTA DR1	All	2009.5	42	158	359	69	165
	\|β\| ≤ 10°	2009.5	12	197	2255	120	1046
	β > 10°	2009.5	30	140	302	67	136
NANOGrav12.5-WB	All	2013.6	47	82	156	44	89
	\|β\| ≤ 10°	2012.5	6	212	977	84	245
	\|β\| > 10°	2013.8	41	65	140	39	80
NANOGrav12.5-NB	All	2013.6	47	58	127	38	79
	\|β\| ≤ 10°	2012.4	6	230	996	82	247
	\|β\| > 10°	2013.8	41	58	108	30	58
IPTA DR2A	All	2010.2	64	161	320	60	154
	\|β\| ≤ 10°	2009.8	15	254	2171	119	924
	\|β\| > 10°	2010.3	49	147	248	45	77
IPTA DR2B	All	2010.2	64	145	314	59	136
	\|β\| ≤ 10°	2009.8	15	281	1763	140	977
	\|β\| > 10°	2010.3	49	109	173	44	70
Combination	All	2011.4	80	107	207	49	107
	\|β\| ≤ 10°	2010.4	15	240	1465	102	581
	\|β\| > 10°	2011.6	65	86	146	39	70

Notes. and . The first four columns tabulate the PTA name, subset, mean position epoch, and the number of pulsars, followed by the typical precision (median) of the position and proper motion measurements. The last three rows represent the combination of all PTA data sets above.

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