2018AJ....155..229F

Query : 2018AJ....155..229F

2018AJ....155..229F - Astron. J., 155, 229-229 (2018/June-0)

Toward the ICRF3: astrometric comparison of the USNO 2016A VLBI solution with ICRF2 and Gaia DR1.

FROUARD J., JOHNSON M.C., FEY A., MAKAROV V.V. and DORLAND B.N.

Abstract (from CDS):

The VLBI USNO 2016A (U16A) solution is part of a work-in-progress effort by USNO toward the preparation of the ICRF3. Most of the astrometric improvement with respect to the ICRF2 is due to the re-observation of the VCS sources. Our objective in this paper is to assess U16A's astrometry. A comparison with ICRF2 shows statistically significant offsets of size 0.1 mas between the two solutions. While Gaia DR1 positions are not precise enough to resolve these offsets, they are found to be significantly closer to U16A than ICRF2. In particular, the trend for typically larger errors for southern sources in VLBI solutions is decreased in U16A. Overall, the VLBI-Gaia offsets are reduced by 21%. The U16A list includes 718 sources not previously included in ICRF2. Twenty of those new sources have statistically significant radio-optical offsets. In two-thirds of the cases, these offsets can be explained from PanSTARRS images.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - catalogs - reference systems

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ICRF J031357.6+411523 BLL 03 13 57.64573391 +41 15 23.9728461   17.3 17.00 10.4   ~ 38 0
2 NVSS J080433-171204 rG 08 04 33.7149332472 -17 12 03.876337944           ~ 15 1
3 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
4 PKS J0914-3314 rG 09 14 36.7223113728 -33 14 52.410291756           ~ 11 1
5 NGC 2911 Sy2 09 33 46.10739467 +10 09 08.8215304   14.96 13.83     ~ 259 0
6 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1507 1
7 ICRF J112009.1-250807 Sy1 11 20 09.1125558984 -25 08 07.543310640   17.26 17.07     ~ 54 1
8 PMN J1146+0458 rG 11 46 31.74136877 +04 58 19.2888315           ~ 18 1
9 ICRF J115410.4+122509 Bla 11 54 10.40732891 +12 25 09.7544630       14.69   ~ 30 1
10 LBQS 1216+1754 QSO 12 18 46.6038838128 +17 38 17.265507252   18.70 18.46     ~ 49 1
11 7C 122131.89+482942.00 QSO 12 23 58.2306 +48 12 57.667   21.1 20.2     ~ 27 1
12 4C 16.39 BLL 14 02 44.5145118408 +15 59 56.654415816   17.20 16.74 15.5   ~ 153 2
13 NGC 5635 SyG 14 28 31.76167367 +27 24 32.2322942   13.9   12.12   ~ 144 1
14 ICRF J164058.8+114404 BLL 16 40 58.89259655 +11 44 04.2123988           ~ 75 1
15 LEDA 3097035 rG 17 05 01.282162 -24 45 09.75486           ~ 19 0
16 IVS B1738-336 Rad 17 42 03.6752003088 -33 41 34.311875244           ~ 7 0
17 PMN J1743-1658 Rad 17 43 06.2735595003 -16 58 15.639112610           ~ 13 1
18 PKS 1750+093 Rad 17 53 02.4008211000 +09 19 59.319539976           ~ 9 1
19 ICRF J182319.6-272626 BLL 18 23 19.65185825 -27 26 26.4035463           ~ 15 1
20 ICRF J183737.6-153244 Rad 18 37 37.6547356632 -15 32 44.850503256           ~ 7 0
21 ICRF J190104.4-211201 BLL 19 01 04.45396318 -21 12 01.1656891       19.14   ~ 18 1
22 ICRF J191414.5+012426 Rad 19 14 14.55346096 +01 24 26.3041506           ~ 12 0
23 PMN J1938+0942 Rad 19 38 43.60624151 +09 42 20.0792746           ~ 12 1
24 NVSS J205050+371433 Rad 20 50 50.8235494752 +37 14 33.286057944           ~ 7 1
25 MCG-05-55-032 rG 23 41 29.76236715 -29 19 15.0382726   15.58   13.394   ~ 42 1

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