Left: SVST support observations of Jupiter for the Galileo Probe descent, Nov. 1997
Middle: Optical reflectance image of Mercury with the SVST on July 9, 1998.
Right: Emission from deep, warm and bright Venus clouds in the infrared K-band with the NOT on May 3, 2004.
Associate Professor (Docent)
Ph.D. in Astronomy
- E-mail:
- Johan.Warell@astro.uu.se
- Mailing address:
-
Department of Physics and Astronomy
Division of Astronomy and Space Physics
Box 516
SE-751 20 Uppsala
SWEDEN
- Telephone:
- +46-18-471 5991
- Fax:
- +46-18-471 5999
Merkurius: en nyckel till solsystemets skapelse
Läs en populärvetenskaplig artikel om Merkurius och min relaterade forskning.
Short summary of research activities
My research has been focussed on planetary imaging, photometry and spectroscopy at optical, near infrared and thermal infrared wavelengths, and modelling of the light scattering and physical properties of Mercury, the Moon, and Mars. I have used observational data from the Swedish 1-m Solar Telescope (SST) and (previously) the Swedish Vacuum Solar Telescope (SVST) of the Royal Swedish Academy of Sciences (KVA), the Nordic Optical Telescope (NOT) and the NASA Infrared Telescope Facility (IRTF). I have also performed photometric, spectroscopic and astrometric studies of Venus, Jupiter, comets, asteroids and Transneptunian objects in the optical and near infrared.
I am Scientific Co-Investigator on the ESA BepiColombo mission's MIRTIS Infrared Thermal Imaging Spectrometer and the MIXS X-ray Imaging Spectrograph, and Minor Planets Specific Source Unit member of the ESA Gaia mission for spectroscopy and classification of minor planets.
In 2003-2004 I was a Wenner-Gren Foundations Post-Doctoral Research Fellow at the Lunar and Planetary Laboratory in Tucson, AZ, working with Dr. Ann Sprague on thermal infrared spectroscopy of Mercury. I performed graduate studies in the Planetary System
Group of the Department of Astronomy and Space Physics at Uppsala University. My Ph.D. thesis is entitled "Regolith properties of Mercury derived from observations and modelling" (2003).
My research is financed primarily by the Swedish National Space Board, but also with grants from the Swedish Research Council, the Wenner-Gren Foundations, Uppsala University and the Löfberg Foundation.
Research
Jupiter: NASA Galileo mission support
Transneptunian objects: Search, astrometry and photometry
Comet C/1995 O1 (Hale-Bopp): Rotation period, dust outflow velocity, and morphology of inner coma
Refereed Papers
- Properties of the Hermean regolith: V. New optical reflectance spectra, comparison with lunar anorthosites, and mineralogical modelling. J. Warell and D.T. Blewett, Icarus, Volume 168, 257-276 (2004)
ADS entry
Preprint (pdf, 810 kB).
- Properties of the Hermean regolith: IV. Photometric parameters of Mercury and the Moon contrasted with Hapke modelling. J. Warell, Icarus, Volume 167, 271-286 (2004)
ADS entry
Preprint (pdf, 310 kB).
- Evolution of Mercury-like orbits: A numerical study. J. Warell, O. Karlsson, E. Skoglöv, Astronomy & Astrophysics, 411, 291-307 (2003).
ADS entry
Preprint (pdf, 650 kB).
- Properties of the Hermean Regolith: III. Disk-resolved vis-NIR reflectance spectra and implications for the abundance of iron. J. Warell, Icarus 161, 199-222 (2003)
ADS entry
Preprint (pdf, 830 kB).
- Regolith properties of Mercury derived from observations and modelling. J. Warell, Ph.D. Thesis, Uppsala Universitet.
Introduction (PDF) (excludes the Papers part of the thesis).
- Properties of the Hermean Regolith: II. Disk-Resolved Multicolor Photometry and Color
Variations of the "Unknown" Hemisphere. J. Warell, Icarus 156, 303-317 (2002).
ADS entry
Preprint (pdf, 650 kB).
- Properties of the Hermean regolith: I. Global regolith albedo variation at 200 km scale
from multicolor CCD imaging. J. Warell and S.S. Limaye, Planetary and Space Science (Special Issue: Returns to Mercury) 49, 1531-1552 (2001).
ADS entry
Preprint (pdf,
550 kB).
- Imaging
the surface of Mercury using ground-based telescopes. Mendillo, M., Warell, J., Limaye, S.S., Baumgardner, J., Sprague, A., and Wilson, J.K. , Planetary and Space Science (Special Issue: Returns to Mercury) 49, 1501-1505 (2001).
ADS entry.
- Dust
continuum imaging of C/1995 O1 (Hale-Bopp): Rotation period and dust outflow velocity. Warell, J., Lagerkvist, C.-I., Lagerros, J.S.V. Astronomy and Astrophysics Supplement 136, 245-256 (1999)
ADS entry.
- VRI Photometry of Kuiper Belt Objects and Centaurs. Ekholm, A.G., Dahlgren, M., Lagerkvist, C.-I., Lagerros, J., Lundström, M., Magnusson, P., Warell, J. 30th Annual Lunar and Planetary Science Conference, 1714-1715 (1999).
ADS entry.
- Polarimetry and astrometry of asteroids at the NOT. Piironen, J., Muinonen, K., Virtanen, J., Keränen, S., Warell, J., Festin, L., Piirola, V., Karttunen, H., Korhonen, H., Aspin, C., Andersen, M., Harrop-Allin, M.K. Astrophysics with the NOT, eds. H. Kartunnen, V. Piirola. University of Turku, Tuorla Observatory, 269-273 (1999).
ADS entry.
- Dust Morphology Of The Inner Coma Of C/1995 O1 (Hale-Bopp). Warell, J., Lagerkvist, C.-I., Lagerros, J.S.V. Earth, Moon and Planets 78, 197-203 (1997)
ADS entry.
- Earth-based observations of the Galileo probe entry site. Orton, G., et al., Science 272, 839-840 (1996)
ADS entry.
- Structure of the Martian North Polar Cap and Vernal Hood System at Ls 61-66 degrees of the 1995 Apparition. Warell, J. Earth, Moon and Planets 74, 93-107 (1996).
ADS entry
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This page last updated 2006-April-21
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