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ALPO Observations of the Remote Planets in 2012-2013

ALPO Observations of the Remote Planets in 2012-2013. Richard W. Schmude, Jr. Gordon State College. Overview. Introduction Images Photometry Conclusions. Introduction. Seasonal brightness changes Uranus Neptune Images Visible Near-infrared. Images. Usually a large telescope

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ALPO Observations of the Remote Planets in 2012-2013

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  1. ALPO Observations of the Remote Planets in 2012-2013 Richard W. Schmude, Jr. Gordon State College

  2. Overview • Introduction • Images • Photometry • Conclusions

  3. Introduction • Seasonal brightness changes • Uranus • Neptune • Images • Visible • Near-infrared

  4. Images • Usually a large telescope • 1.0 m Pic du Midi Observatory (France) • 1.29 m Skinakas Observatory (Greece) • Filters: • B, V, R • Near-infrared

  5. Uranus: Sept. 14, 2012Flavius Isac 0.25 m SCT

  6. Uranus: August 8, 2012F. Colas, J. L. Dauvergne, M. Delcroix, T. Legault & C. ViladrichPic du Midi 1.0 m telescope

  7. Uranus: September 17, 2012A. Obukhov, Moscow Russia (C11 telescope)

  8. Uranus: September 17, 2012J. Boudreau, MA, USA (C11)

  9. Uranus Belt Latitudes • Equatorial Belt • 2° S to 13° N (3° uncertainty) • North Temperate Belt • 45 3° N to 59° N (3° uncertainty)

  10. Neptune: August 27, 2012G. Maravelias and M. Kardasis Skinakas Observatory 1.29 m

  11. Photometry • Measurement of Brightness • Accurate brightness measurements since 1950 • B, V, R and I filters

  12. Photometry: Uranus V(1,a) = -7.117 ± 0.007 B – V = 0.47 R – V = 0.307 I – R = 1.18 *Uranus is a little fainter than in the previous apparition

  13. Photometry: Neptune V(1,a) = -7.005 ± 0.009 B – V = 0.384

  14. Photometry: Oberon • September 24, 2012 unfiltered image: • Titania was 0.25 mag. brighter than Oberon

  15. Conclusions • Several astronomers have imaged albedo features on Uranus using telescopes as small as a C11. • Uranus is a little fainter than in the previous apparition

  16. Acknowledgements P. Abbott, K. Bailey, J. Boudreau, F. Colas, J. L. Dauvergne, M. Delcroix, F. Emond, J. Fox, M, Kardasis, T. Legault, S. Maksymowicz, G. Maravelias, M. Mattei, F. Melillo, C. Pellier, J. P. Prost, T. Boyle, C. Viladrich P. Abel, P. Bayle, G. Bianchi, D. Gray, T. Ikemura, F. Isac, A. Kazemoto, A. Lasala, P. Maxson, A. Medugno, S. Mogami, A. Obukhov, D. Peach, J. J. Poupeau, E. Punzo, S. Quaresima, H. Sasse, J. Sussenbach, G. Tarsoudis and A. Yamazaki

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