This map shows the geographic impact of A. R. Upgren's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by A. R. Upgren with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites A. R. Upgren more than expected).
This network shows the impact of papers produced by A. R. Upgren. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by A. R. Upgren. The network helps show where A. R. Upgren may publish in the future.
Co-authorship network of co-authors of A. R. Upgren
This figure shows the co-authorship network connecting the top 25 collaborators of A. R. Upgren.
A scholar is included among the top collaborators of A. R. Upgren based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with A. R. Upgren. A. R. Upgren is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Upgren, A. R., et al.. (2002). Space Motions of Low-Mass Stars. III.. 11. 91–100.3 indexed citations
3.
Upgren, A. R.. (1997). The measurement of night-sky brightness. Observatory. 117. 19–24.1 indexed citations
4.
Hanson, Ronald K., et al.. (1991). 24. Photographic Astrometry. Transactions of the International Astronomical Union. 21(2). 233–240.4 indexed citations
5.
Philip, A. G. D., A. R. Upgren, & K. A. Janes. (1991). Precision photometry : astrophysics of the galaxy, October 3-5, 1990, Meeting held in Schenectady, New York at Union College.2 indexed citations
Upgren, A. R., et al.. (1990). Parallaxes: History, Survey and Outlook. 225. 7–18.1 indexed citations
8.
Philip, A. G. D. & A. R. Upgren. (1989). Star catalogues : a centennial tribute to A. N. Vyssotsky : a meeting of IAU Commission 24, held in Baltimore, Maryland during the XX General Assembly of the IAU, August 5, 1988.1 indexed citations
Upgren, A. R., et al.. (1981). Results of a Pilot Program to Measure Light Pollution. Bulletin of the American Astronomical Society. 13. 813.2 indexed citations
14.
Upgren, A. R.. (1980). Van-Vleck Observatory. Bulletin of the American Astronomical Society. 12. 407.1 indexed citations
15.
Upgren, A. R., et al.. (1978). The Significance of Individual Errors of Trigonometric Parallaxes. Bulletin of the American Astronomical Society. 10. 402.1 indexed citations
16.
Upgren, A. R., et al.. (1973). The significance of parallaxes in x and y coordinates.. Bulletin of the American Astronomical Society. 5. 265.1 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.