P. D. Usher

438 total citations
62 papers, 244 citations indexed

About

P. D. Usher is a scholar working on Astronomy and Astrophysics, Instrumentation and Computational Mechanics. According to data from OpenAlex, P. D. Usher has authored 62 papers receiving a total of 244 indexed citations (citations by other indexed papers that have themselves been cited), including 38 papers in Astronomy and Astrophysics, 21 papers in Instrumentation and 11 papers in Computational Mechanics. Recurrent topics in P. D. Usher's work include Astronomy and Astrophysical Research (21 papers), Stellar, planetary, and galactic studies (16 papers) and Astronomical Observations and Instrumentation (11 papers). P. D. Usher is often cited by papers focused on Astronomy and Astrophysical Research (21 papers), Stellar, planetary, and galactic studies (16 papers) and Astronomical Observations and Instrumentation (11 papers). P. D. Usher collaborates with scholars based in United States, Italy and Russia. P. D. Usher's co-authors include K. J. Mitchell, G. B. Rybicki, Igor Jurkevich, Frances W. Wright, O. P. Manley, David L. Hall, R. Giacconi, P. Gorenstein, Patrick S. Osmer and J. V. Peach and has published in prestigious journals such as Nature, The Astrophysical Journal and Journal of Computational Physics.

In The Last Decade

P. D. Usher

46 papers receiving 222 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
P. D. Usher United States	9	196	70	42	41	12	62	244
Arthur D. Code United States	11	331 1.7×	14 0.2×	72 1.7×	25 0.6×	25 2.1×	32	385
A. Putney United States	10	272 1.4×	51 0.7×	54 1.3×	14 0.3×	9 0.8×	17	343
M. Jelínek Spain	11	331 1.7×	81 1.2×	43 1.0×	49 1.2×	18 1.5×	119	399
E. Fernández Spain	10	256 1.3×	162 2.3×	71 1.7×	10 0.2×	24 2.0×	33	374
A. Ederoclite Spain	15	459 2.3×	84 1.2×	109 2.6×	43 1.0×	16 1.3×	52	479
J. A. Westphal United States	11	377 1.9×	48 0.7×	119 2.8×	21 0.5×	30 2.5×	27	449
A. A. Hoag United States	10	184 0.9×	23 0.3×	66 1.6×	22 0.5×	31 2.6×	31	254
N. U. Mayall United States	7	356 1.8×	48 0.7×	156 3.7×	32 0.8×	21 1.8×	17	401
Tansu Daylan United States	12	308 1.6×	36 0.5×	96 2.3×	23 0.6×	18 1.5×	27	331
A. P. Reynolds Netherlands	12	388 2.0×	69 1.0×	31 0.7×	37 0.9×	24 2.0×	31	409

Countries citing papers authored by P. D. Usher

Since Specialization

Citations

This map shows the geographic impact of P. D. Usher'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 P. D. Usher with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites P. D. Usher more than expected).

Fields of papers citing papers by P. D. Usher

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by P. D. Usher. 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 P. D. Usher. The network helps show where P. D. Usher may publish in the future.

Co-authorship network of co-authors of P. D. Usher

This figure shows the co-authorship network connecting the top 25 collaborators of P. D. Usher. A scholar is included among the top collaborators of P. D. Usher 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 P. D. Usher. P. D. Usher is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

1.

Usher, P. D. & E. Massaro. (2024). THE SIXTEENTH-CENTURY EMPIRICAL DISPROOF OF PTOLEMAIC GEOCENTRISM: PAPER II. Journal of Astronomical History and Heritage. 27(1). 63–72.

2.

Usher, P. D. & E. Massaro. (2023). THE SIXTEENTH-CENTURY EMPIRICAL DISPROOF OF PTOLEMAIC GEOCENTRISM. Journal of Astronomical History and Heritage. 26(3). 659–666. 2 indexed citations

3.

Massaro, E. & P. D. Usher. (2022). ANCIENT AND RENAISSANCE ASTRONOMERS IN SHAKESPEARE’S <italic>THE TRAGEDY OF HAMLET</italic>. Journal of Astronomical History and Heritage. 25(4). 745–759.

4.

Usher, P. D.. (2009). Shakespeare and Elizabethan Telescopy. ScholarSphere (Penn State Libraries). 103(1). 16.

5.

Usher, P. D.. (2003). Galileo's Telescopy and Jupiter's Tablet. ScholarSphere (Penn State Libraries). 203. 1 indexed citations

6.

Usher, P. D.. (1997). Hamlet's Transformation (1999). ScholarSphere (Penn State Libraries). 191.

7.

Fabian, D. & P. D. Usher. (1996). Optical Morphology of Bright Quasars on Images Taken With 1.2 M Schmidt Cameras. The Astronomical Journal. 111. 645–645. 2 indexed citations

8.

Usher, P. D.. (1995). A New Reading of Shakespeare's King John.. American Astronomical Society Meeting Abstracts. 187. 1 indexed citations

9.

Usher, P. D. & K. J. Mitchell. (1990). Faint blue objects at high galactic latitude. VI - Palomar Schmidt field centered on Selected Area 82. The Astrophysical Journal Supplement Series. 74. 885–885. 11 indexed citations

10.

Usher, P. D., et al.. (1987). Surface Brightnesses from Standard Stars with Wide-Field Cameras. Bulletin of the American Astronomical Society. 19. 684.

11.

Usher, P. D., et al.. (1986). On the completeness of a sample of bright quasars selected by colour excess in the direction of the North Galactic Pole. Monthly Notices of the Royal Astronomical Society. 218(3). 445–451. 3 indexed citations

12.

Mitchell, K. J., J. J. Condon, & P. D. Usher. (1982). The Radio and Optical Properties of a Complete Sample of Optically Identified Quasars. Bulletin of the American Astronomical Society. 14. 910.

13.

Condon, J. J., et al.. (1980). Radio observations of a new class of optically selected quasi-stellar objects. The Astrophysical Journal. 242. 486–486. 1 indexed citations

14.

Usher, P. D., et al.. (1974). Optical variability of PKS0048-097. Nature. 252(5482). 365–365. 1 indexed citations

15.

Crovisier, J., et al.. (1974). Optical and Radio Properties of a New BL Lacertae Class Object. 30. 175.

16.

Usher, P. D., et al.. (1971). Optical Variability of a Bright New Quasi-stellar Source. Nature. 232(5313). 622–623. 2 indexed citations

17.

Usher, P. D., et al.. (1970). Photometric History of BL Lacertae. Nature. 228(5276). 1070–1072. 13 indexed citations

18.

Usher, P. D., R. D. Cannon, & M. V. Penston. (1969). Light curve of the N-type galaxy 3C 371. Observatory. 89. 198. 3 indexed citations

19.

Usher, P. D.. (1966). Some New Algorithms for Stellar Structure.. Defense Technical Information Center (DTIC). 213.

20.

Usher, P. D.. (1963). The spectral type distribution in young clusters according to the theory of evolution with mass loss. Observatory. 83. 184–187.

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.

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