Figure 4 from Toward the ICRF3: Astrometric Comparison of the USNO 2016A VLBI Solution with ICRF2 and Gaia DR1

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Toward the ICRF3: Astrometric Comparison of the USNO 2016A VLBI Solution with ICRF2 and Gaia DR1

Authors: Julien Frouard, Megan C. Johnson, Alan Fey, Valeri V. Makarov, and Bryan N. Dorland

2018 The Astronomical Journal 155 229.

Provider: AAS Journals

Caption: Figure 4.

Equatorial map (Aitoff projection) showing the ratio (number of U16A sources with a Gaia DR1 counterpart)/(number of U16A sources) in pixels of ∼54 deg². Low (darker) values indicate a scarcity of Gaia counterparts. White pixels correspond to regions without data at this resolution.

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