PTYS/LPL Faculty

Vishnu Reddy

Associate Professor
Small Bodies, Space Situational Awareness, Spectroscopy
Ph.D., 2009, University of North Dakota

1-808-342-8932 ∙ 520-621-6969
Kuiper 233

Years with LPL: Spring 2016


Dr. Reddy’s research focuses on understanding the behavior of space objects (natural and artificial) using a range of Earth and space-based assets. His work on natural moving objects (asteroids, near-Earth objects) is directed towards their characterization for impact hazard assessment/mitigation, asteroid-meteorite link and resource utilization. To this effort, Dr. Reddy uses the NASA Infrared Telescope Facility on Mauna Kea, Hawai’i.

The orbital space around the Earth is an invaluable resource that is increasingly becoming congested, contested, and competitive with the ever increasing threat from artificial and our adversaries. Dr. Reddy uses the same techniques used to characterize asteroid to study the behavior of artificial objects to identify their nature, intent and origin. He is setting up a space material characterization lab to observe the reflectance properties of natural (meteorites/minerals) and artificial space material in space like conditions. 

Current Grants


  • Spectral Characterization of Small Near-Earth Objects
  • Spectral Characterization of Geo-Stationary Objects
  • Doppler radar tracking and recovery of artificial and natural space debris
  • Characterization of Spacecraft Mission Targets
Period Role $k Source Short Title
2013-19 PI 900 NASA PMDAP Hayabusa Mission Data Calibration
2018-19 PI 100 NASA ECF Sagan Early Career Fellowship
2017-22 PI 736 NASA NEOO Characterization of Small NEOs
2014-18 Co-I 1000 NASA PMDAP Dawn Mission Data Calibration
2018-19 Co-I 120 ABOR RIF Characterization of NEO Mission Targets
2018-19 Co-I 109 NASA PDCO NEOCam Follow Up Tool Development


Current Spacecraft Involvement

  • OSIRIS-REx (Sample Return mission to NEA 101955 Bennu)
  • NEOCam (Discovery Extended Phase A Study)
  • DESTINY+ (Japanese Space Agency mission to NEO 3200 Phaethon)
  • NASA Dawn Mission to Dwarf Planet Ceres

Current PTYS Graduate Students

Student Collaborations/Advising

Students from outside UA PTYS

  • Tanner Campbell (PhD Student: Aerospace and Mechanical Engineering)
  • Adriana Mitchell (Senior: Optical Sciences)
  • Joe Padish (Senior: Aerospace and Mechanical Engineering)
  • Parker Noonan Kaufmann (Sophomore: Computer Science)
  • David Cantillo (Freshman: Geosciences)

Current Postdocs

  • Juan Sanchez (PSI)

Former Postdocs

  • Michael Craig (LPL)


Complete publications list available from: NASA ADS Author search: Vishnu Reddy

Refereed Publications (NASA ADS): Calendar Year 2016 through July 2018

Cloutis, E. A., Reddy, V., Blewett, D. T. The ungrouped achondrite Northwest Africa (NWA) 7325: Spectral reflectance properties and implications for parent body identification 2018Icar..311..384C

Hardersen, P. S., Reddy, V., Cloutis, E., Nowinski, M., Dievendorf, M., Genet, R. M., Becker, S., Roberts, R. Basalt or Not? Near-infrared Spectra, Surface Mineralogical Estimates, and Meteorite Analogs for 33 Vp-type Asteroids 2018AJ....156...11H

McGraw, A. M., Reddy, V., Sanchez, J. A. Do L chondrites come from the Gefion family? 2018MNRAS.476..630M

Cloutis, E. A., Pietrasz, V. B., Kiddell, C., Izawa, M. R. M., Vernazza, P., Burbine, T. H., DeMeo, F., Tait, K. T., Bell, J. F., Mann, P., Applin, D. M., Reddy, V. Spectral reflectance "deconstruction" of the Murchison CM2 carbonaceous chondrite and implications for spectroscopic investigations of dark asteroids 2018Icar..305..203C

Drummond, J. D., Merline, W. J., Carry, B., Conrad, A., Reddy, V., Tamblyn, P., Chapman, C. R., Enke, B. L., Pater, I. d., Kleer, K. d., Christou, J., Dumas, C. The triaxial ellipsoid size, density, and rotational pole of asteroid (16) Psyche from Keck and Gemini AO observations 2004-2015 2018Icar..305..174D

Le Corre, L., Sanchez, J. A., Reddy, V., Takir, D., Cloutis, E. A., Thirouin, A., Becker, K. J., Li, J.-Y., Sugita, S., Tatsumi, E. Ground-based characterization of Hayabusa2 mission target asteroid 162173 Ryugu: constraining mineralogical composition in preparation for spacecraft operations 2018MNRAS.475..614L

Reddy, V., Sanchez, J. A., Furfaro, R., Binzel, R. P., Burbine, T. H., Le Corre, L., Hardersen, P. S., Bottke, W. F., Brozovic, M. Surface Composition of (99942) Apophis 2018AJ....155..140R

Bhatt, M., Reddy, V., Schindler, K., Cloutis, E., Bhardwaj, A., Corre, L. L., Mann, P.  Composition of Jupiter irregular satellites sheds light on their origin 2017A&A...608A..67B

Nathues, A., Platz, T., Hoffmann, M., Thangjam, G., Cloutis, E. A., Applin, D. M., Le Corre, L., Reddy, V., Mengel, K., Protopapa, S., Takir, D., Preusker, F., Schmidt, B. E., Russell, C. T.  Oxo Crater on (1) Ceres: Geological History and the Role of Water-ice 2017AJ....154...84N

Schmidt, B. E., Hughson, K. H. G., Chilton, H. T., Scully, J. E. C., Platz, T., Nathues, A., Sizemore, H., Bland, M. T., Byrne, S., Marchi, S., O'Brien, D. P., Schorghofer, N., Hiesinger, H., Jaumann, R., Pasckert, J. H., Lawrence, J. D., Buzckowski, D., Castillo-Rogez, J. C., Sykes, M. V., Schenk, P. M., Desanctis, M.-C., Mitri, G., Formisano, M., Li, J.-Y., Reddy, V., Lecorre, L., Russell, C. T., Raymond, C. A.  Geomorphological evidence for ground ice on dwarf planet Ceres 2017NatGe..10..338S

Brozović, M., Benner, L. A. M., Magri, C., Scheeres, D. J., Busch, M. W., Giorgini, J. D., Nolan, M. C., Jao, J. S., Lee, C. G., Snedeker, L. G., Silva, M. A., Lawrence, K. J., Slade, M. A., Hicks, M. D., Howell, E. S., Taylor, P. A., Sanchez, J. A., Reddy, V., Dykhuis, M., Corre, L. L.  Goldstone radar evidence for short-axis mode non-principal-axis rotation of near-Earth asteroid (214869) 2007 PA8 2017Icar..286..314B

McCraig, M. A., Osinski, G. R., Cloutis, E. A., Flemming, R. L., Izawa, M. R. M., Reddy, V., Fieber-Beyer, S. K., Pompilio, L., van der Meer, F., Berger, J. A., Bramble, M. S., Applin, D. M.  Fitting the curve in Excel®: Systematic curve fitting of laboratory and remotely sensed planetary spectra 2017CG....100..103M

Nathues, A., Platz, T., Thangjam, G., Hoffmann, M., Mengel, K., Cloutis, E. A., Le Corre, L., Reddy, V., Kallisch, J., Crown, D. A.  Evolution of Occator Crater on (1) Ceres 2017AJ....153..112N

Shepard, M. K., Richardson, J., Taylor, P. A., Rodriguez-Ford, L. A., Conrad, A., de Pater, I., Adamkovics, M., de Kleer, K., Males, J. R., Morzinski, K. M., Close, L. M., Kaasalainen, M., Viikinkoski, M., Timerson, B., Reddy, V., Magri, C., Nolan, M. C., Howell, E. S., Benner, L. A. M., Giorgini, J. D., Warner, B. D., Harris, A. W.  Radar observations and shape model of asteroid 16 Psyche 2017Icar..281..388S

Takir, D., Reddy, V., Sanchez, J. A., Shepard, M. K., Emery, J. P.  Detection of Water and/or Hydroxyl on Asteroid (16) Psyche 2017AJ....153...31T

Sanchez, J. A., Reddy, V., Shepard, M. K., Thomas, C., Cloutis, E. A., Takir, D., Conrad, A., Kiddell, C., Applin, D.  Detection of Rotational Spectral Variation on the M-type Asteroid (16) Psyche 2017AJ....153...29S

Nathues, A., Hoffmann, M., Platz, T., Thangjam, G. S., Cloutis, E. A., Reddy, V., Le Corre, L., Li, J.-Y., Mengel, K., Rivkin, A., Applin, D. M., Schaefer, M., Christensen, U., Sierks, H., Ripken, J., Schmidt, B. E., Hiesinger, H., Sykes, M. V., Sizemore, H. G., Preusker, F., Russell, C. T.  FC colour images of dwarf planet Ceres reveal a complicated geological history 2016P&SS..134..122N

Reddy, V., Sanchez, J. A., Bottke, W. F., Thirouin, A., Rivera-Valentin, E. G., Kelley, M. S., Ryan, W., Cloutis, E. A., Tegler, S. C., Ryan, E. V., Taylor, P. A., Richardson, J. E., Moskovitz, N., Le Corre, L.  Physical Characterization of ˜2 M Diameter Near-Earth Asteroid 2015 TC25: A Possible Boulder from E-type Asteroid (44) Nysa 2016AJ....152..162R

Reddy, V., Sanchez, J. A.  Reddy Main Belt Asteroid Spectra V1.0 2016PDSS..242.....R

Hanuš, J., Delbo', M., Vokrouhlický, D., Pravec, P., Emery, J. P., Alí-Lagoa, V., Bolin, B., Devogèle, M., Dyvig, R., Galád, A., Jedicke, R., Kornoš, L., Kušnirák, P., Licandro, J., Reddy, V., Rivet, J.-P., Világi, J., Warner, B. D.  Near-Earth asteroid (3200) Phaethon: Characterization of its orbit, spin state, and thermophysical parameters 2016A&A...592A..34H

Pravec, P., Scheirich, P., Kušnirák, P., Hornoch, K., Galád, A., Naidu, S. P., Pray, D. P., Világi, J., Gajdoš, Š., Kornoš, L., Krugly, Y. N., Cooney, W. R., Gross, J., Terrell, D., Gaftonyuk, N., Pollock, J., Husárik, M., Chiorny, V., Stephens, R. D., Durkee, R., Reddy, V., Dyvig, R., Vraštil, J., Žižka, J., Mottola, S., Hellmich, S., Oey, J., Benishek, V., Kryszczyńska, A., Higgins, D., Ries, J., Marchis, F., Baek, M., Macomber, B., Inasaridze, R., Kvaratskhelia, O., Ayvazian, V., Rumyantsev, V., Masi, G., Colas, F., Lecacheux, J., Montaigut, R., Leroy, A., Brown, P., Krzeminski, Z., Molotov, I., Reichart, D., Haislip, J., LaCluyze, A.  Binary asteroid population. 3. Secondary rotations and elongations 2016Icar..267..267P

Berg, B. L., Cloutis, E. A., Beck, P., Vernazza, P., Bishop, J. L., Takir, D., Reddy, V., Applin, D., Mann, P.  Reflectance spectroscopy (0.35-8 μm) of ammonium-bearing minerals and qualitative comparison to Ceres-like asteroids 2016Icar..265..218B

Blewett, D. T., Denevi, B. W., Le Corre, L., Reddy, V., Schröder, S. E., Pieters, C. M., Tosi, F., Zambon, F., De Sanctis, M. C., Ammannito, E., Roatsch, T., Raymond, C. A., Russell, C. T.  Optical space weathering on Vesta: Radiative-transfer models and Dawn observations 2016Icar..265..161B

Li, J.-Y., Reddy, V., Nathues, A., Le Corre, L., Izawa, M. R. M., Cloutis, E. A., Sykes, M. V., Carsenty, U., Castillo-Rogez, J. C., Hoffmann, M., Jaumann, R., Krohn, K., Mottola, S., Prettyman, T. H., Schaefer, M., Schenk, P., Schröder, S. E., Williams, D. A., Smith, D. E., Zuber, M. T., Konopliv, A. S., Park, R. S., Raymond, C. A., Russell, C. T.  Surface Albedo and Spectral Variability of Ceres 2016ApJ...817L..22L

Thomas, C. A., Abell, P., Castillo-Rogez, J., Moskovitz, N., Mueller, M., Reddy, V., Rivkin, A., Ryan, E., Stansberry, J.  Observing Near-Earth Objects with the James Webb Space Telescope 2016PASP..128a8002T

Available filesSizeCreated
PDF icon Reddy CV_082017.pdf127.09 KBDecember 12, 2018
Semester Course Day/Time Location Resources
Spring 2021 PTYS 595B-006
Fall 2018 PTYS 595B-001 W 1:00-3:00p.m. Kuiper 312 Syllabus
Fall 2017 PTYS 516-001 TTH 2:00 - 3:15 p.m. Kuiper 312 Syllabus
Course Page
Fall 2017 PTYS 416-001 TTH 2:00 - 3:15 p.m. Kuiper 312 Syllabus
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Last updated on August 2, 2018