D. B. Shaffer

3.2k citations

77 papers · 2.5k · 1 hit paper · h-index 21

Impact in

Astronomy and Astrophysics top 5%
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
Nuclear and High Energy Physics
- Astrophysics and Cosmic Phenomena

Papers in

Astronomy and Astrophysics 74
- Astrophysical Phenomena and Observations 54
- Galaxies: Formation, Evolution, Phenomena 34
- Radio Astronomy Observations and Technology 15
- Stellar, planetary, and galactic studies 11
Nuclear and High Energy Physics 11
- Astrophysics and Cosmic Phenomena 11

Co-authors: K. I. Kellermann (35 shared papers)Richard A. Sramek (5 shared papers)Maarten Schmidt (5 shared papers)M. H. Cohen (16 shared papers)B. G. Clark (11 shared papers)R. F. Green (1 shared paper)Barry J. Geldzahler (9 shared papers)Richard T. Schilizzi (11 shared papers)
Journals: The Astrophysical Journal (39 papers)The Astronomical Journal (12 papers)Nature (2 papers)Journal of Geophysical Research Atmospheres (1 paper)Geophysical Research Letters (1 paper)
Partner nations: United States Germany Australia

In The Last Decade

D. B. Shaffer

74 papers receiving 2.2k citations

D. B. Shaffer's Hit Papers

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VLA observations of objects in the Palomar Bright Quasar Survey 1989 · 1.1k citations

What are hit papers?

Paper score: A paper's citations measured against the top-1% bar of its own field and year: the square root of citations ÷ bar, so 1 means right at the bar and 2 means four times its citations. The bar blends the citation counts that enter the top 1% of the paper's subfields in its year (weighted 89.5%), of those subfields over all years (0.5%) and of its year across all fields (10%); a subfield and year with fewer than 400 papers takes its year's bar. Papers from 2026 are not scored yet: in an unfinished year, when a paper appeared matters more than how it is cited.

Hit paper: A paper cited at least 1.5× the top-1% bar of its field and year: a paper score of at least √1.5.

1989 The Astronomical Journal

Peers

Countries citing papers authored by D. B. Shaffer

Since Specialization

Citations

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

Fields of papers citing papers by D. B. Shaffer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authors

The 25 scholars most cited alongside D. B. Shaffer, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with D. B. Shaffer Line = papers co-authored together D. B. Shaffer links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

Showing the 20 most-cited of 77 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	VLA observations of objects in the Palomar Bright Quasar Survey The Astronomical Journal ·K. I. Kellermann, Richard A. Sramek, Maarten Schmidt, D. B. Shaffer, R. Green Hit paper breakdown →	1989	1054
2	The radio structure of radio loud and radio quiet quasars in the Palomar Bright Quasar Survey The Astronomical Journal ·K. I. Kellermann, Richard A. Sramek, Maarten Schmidt, R. F. Green, D. B. Shaffer	1994	181
3	The Small-Scale Structure of Radio Galaxies and Quasi-Stellar Sources at 3.8 Centimeters The Astrophysical Journal ·M. H. Cohen, G. H. Purcell, D. B. Shaffer, J. J. Broderick, K. I. Kellermann, David L Jauncey +1 other	1971	118
4	A Radio Reference Frame The Astronomical Journal ·K. J. Johnston, Alan L. Fey, N. Zacharias, Jane L. Russell, Chao Ma, C. de Vegt, J. E. Reynolds, David L Jauncey	1995	117
5	Radio sources with superluminal velocities Nature ·M. H. Cohen, K. I. Kellermann, D. B. Shaffer, R. P. Linfield, Alan T. Moffet, J. D. Romney, George A. Seielstad, I. I. K. Pauliny‐Toth	1977	84
6	Geodesy by radio interferometry: Evidence for contemporary plate motion Journal of Geophysical Research Atmospheres ·THOMAS A. HERRING, Irwin I. Shapiro, Thomas Alan Clark, Chao Ma, Bruce R. Schupler, Curtis A. Knight, G. Lundqvist, D. B. Shaffer	1986	65
7	Radio-source positions from VLBI The Astronomical Journal ·Chao Ma, Thomas Alan Clark, J. Ryan, THOMAS A. HERRING, Irwin I. Shapiro, Brian E. Corey, Hans F. Hinteregger, Alan E. E. Rogers	1986	49
8	Positions of Radio Sources from Long-Baseline Interferometry The Astronomical Journal ·M. H. Cohen, D. B. Shaffer	1971	45
9	Geodetic measurement of deformation in the Loma Prieta, California Earthquake with very long baseline interferometry Geophysical Research Letters ·Thomas Alan Clark, Chao Ma, Jeanne Sauber, David Gordon, D. B. Shaffer, D. S. Caprette, Nancy R. Vandenberg +1 other	1990	34
10	Further monitoring of the structure of superluminal radio sources The Astrophysical Journal ·George A. Seielstad, M. H. Cohen, R. P. Linfield, Alan T. Moffet, J. D. Romney, Richard T. Schilizzi, D. B. Shaffer	1979	33
11	The small radio source at the galactic center The Astrophysical Journal ·K. I. Kellermann, D. B. Shaffer, B. G. Clark, Barry J. Geldzahler	1977	30
12	A radio optical reference frame. I - Precise radio source positions determined by Mark III VLBI - Observations from 1979 to 1988 and a tie to the FK5 The Astronomical Journal ·Chao Ma, D. B. Shaffer, C. de Vegt, K. J. Johnston, Jane L. Russell	1990	30
13	The parsec-scale radio jet of 4C 39.25 The Astrophysical Journal ·A. Alberdi, J. M. Marcaide, Alan P. Marscher, Y. F. Zhang, P. Elósegui, José Luis Gómez, D. B. Shaffer	1993	30
14	Observations with a VLB array. III - The sources 3C 120, 3C 273B, 2134+004, and 3C 84 The Astrophysical Journal ·Richard T. Schilizzi, M. H. Cohen, D. B. Shaffer, K. L. Kellermann, Jr. Swenson G. W., Jui Lin Yen, R. Rinehart, J. D. Romney	1975	29
15	The NRAO 5-GHz radio source survey. II. The 140-ft "Strong", "Intermediate", and "Deep" source surveys. The Astronomical Journal ·I. I. K. Pauliny‐Toth, K. I. Kellermann, Mike Davis, Edward B. Fomalont, D. B. Shaffer	1972	28
16	Compact Radio Source in the Nucleus of M87 The Astrophysical Journal ·M. H. Cohen, Alan T. Moffet, D. B. Shaffer, B. G. Clark, K. I. Kellermann, D. L. Jauncey, Samuel L. Gulkis	1969	25
17	THE ALGOL TRIPLE SYSTEM SPATIALLY RESOLVED AT OPTICAL WAVELENGTHS Maryland Shared Open Access Repository (USMAI Consortium) ·Robert T. Zavala, Christian A. Hummel, D. A. Boboltz, R. Ojha, D. B. Shaffer, C. Tycner, Mercedes T. Richards, Donald J. Hutter	2010	25
18	High resolution observations of NGC1275 with a four-element intercontinental radio interferometer Nature ·I. I. K. Pauliny‐Toth, Eugen Preuss, A. Witzel, K. I. Kellermann, D. B. Shaffer, G. H. Purcell, G. Grove, D. L. Jones	1976	23
19	Optical and radio observations for the BL Lacertae objects 1219 + 28, 0851 + 202, and 1400 + 162 The Astrophysical Journal ·D. Weistrop, Paul M. N. Hintzen, D. B. Shaffer, William Romanishin	1985	22
20	Observations of compact radio nuclei in Cygnus A, Centaurus A, and other extended radio sources The Astrophysical Journal ·K. I. Kellermann, B. G. Clark, Arthur E. Niell, D. B. Shaffer	1975	21

About D. B. Shaffer

D. B. Shaffer is a scholar working on Astronomy and Astrophysics, Nuclear and High Energy Physics, Aerospace Engineering, Computational Mechanics and Geophysics, having authored 77 papers that have together received 2.5k indexed citations. Recurring topics across this work include Astrophysical Phenomena and Observations (54 papers), Galaxies: Formation, Evolution, Phenomena (34 papers), Radio Astronomy Observations and Technology (15 papers), Stellar, planetary, and galactic studies (11 papers), Astrophysics and Cosmic Phenomena (11 papers), GNSS positioning and interference (9 papers), Astronomical Observations and Instrumentation (3 papers) and earthquake and tectonic studies (2 papers). The work is most often cited by research in Astronomy and Astrophysics (2.2k citations), Nuclear and High Energy Physics (364 citations), Instrumentation (28 citations), Aerospace Engineering (185 citations) and Geophysics (57 citations). D. B. Shaffer has collaborated with scholars based in United States, Germany and Australia. Frequent co-authors include K. I. Kellermann, Richard A. Sramek, Maarten Schmidt, M. H. Cohen, B. G. Clark, R. F. Green, Barry J. Geldzahler, Richard T. Schilizzi, David L Jauncey and I. I. K. Pauliny‐Toth. Their work appears in journals such as The Astrophysical Journal, The Astronomical Journal, Nature, Journal of Geophysical Research Atmospheres and Geophysical Research Letters.

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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D. B. Shaffer

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