10th planet has a Moon10th planet has a Moon
Jadwiga Daszyńska-Daszkiewicz
Instytut Astronomiczny, UWr.
28 October 2005, Journal Club28 October 2005, Journal Club
July 30, 2005 - an object larger than Pluto has beenJuly 30, 2005 - an object larger than Pluto has been
discovered in the Kuiper belt discovered in the Kuiper belt
Team: Mike Brown (Caltech), Chad Trujillo (Gemini Obs.)Team: Mike Brown (Caltech), Chad Trujillo (Gemini Obs.)
David Rabinowitz (Yale Uni.) David Rabinowitz (Yale Uni.)
Samuel Oschin Telescope at Palomar Observatory (48-inch)Samuel Oschin Telescope at Palomar Observatory (48-inch)
Brown, Trujillo, RabinowitzBrown, Trujillo, Rabinowitz
,,Discovery of the planetary-sized object in the scattered Kuiper belt’’
astro-ph/0508663, submitted to ApJL, August 30, 2005astro-ph/0508663, submitted to ApJL, August 30, 2005
2003 UB3132003 UB313
BASIC CHARACTERISTICS OF 2003 UB313BASIC CHARACTERISTICS OF 2003 UB313
the largest known object in orbit beyond Neptun the largest known object in orbit beyond Neptun
the most distant object yet seen in the Solar System the most distant object yet seen in the Solar System
currently near aphelion at 97.5 0.01 AU currently near aphelion at 97.5 0.01 AU
4th brightest KBO 4th brightest KBO
i = 43o.993 0.001 , e = 0.4378 0.0001 i = 43o.993 0.001 , e = 0.4378 0.0001
spectrum dominated by absorption due to methane spectrum dominated by absorption due to methane
Basic characteriscts of 2003 UB313Basic characteriscts of 2003 UB313
The orbit of 2003 UB313The orbit of 2003 UB313
Relative reflectance of 2003 UB313Relative reflectance of 2003 UB313
September 10, 2005 - moon discovered orbiting 10th planetSeptember 10, 2005 - moon discovered orbiting 10th planet
October 3, 2005 – the press announcementOctober 3, 2005 – the press announcement
team of Mike Brown team of Mike Brown
,,Satellites of the largest Kuiper belt object’’
Brown et al., submitted to ApJL, October 2, 2005Brown et al., submitted to ApJL, October 2, 2005
Keck II Telescope, Laser Guide Star Adaptive Optics systemKeck II Telescope, Laser Guide Star Adaptive Optics system
S/2005 (2003 UB313) 1 S/2005 (2003 UB313) 1
LASER GUIDE STAR ADAPTIVE OPTICS SYSTEMLASER GUIDE STAR ADAPTIVE OPTICS SYSTEM
- allows to measures and correct for the aberrations of starlight- allows to measures and correct for the aberrations of starlight
- works similarly to natural guide star- works similarly to natural guide star
- instead of a natural bright star uses 589 nm laser light- instead of a natural bright star uses 589 nm laser light
Images of the four brightest KBO from Keck LGS AOImages of the four brightest KBO from Keck LGS AO
Keck Observatory image of 2003 UB313 and S/2005Keck Observatory image of 2003 UB313 and S/2005
Basic characteristics of S/2005Basic characteristics of S/2005
fractional brightness of satellite 0.02 fractional brightness of satellite 0.02
apparent semi-major axis 0.53’’ apparent semi-major axis 0.53’’
true semi-major axis 36000 km true semi-major axis 36000 km
orbital period 14 days orbital period 14 days
Relative sizes and separations of 2003 UB313 and S/2005Relative sizes and separations of 2003 UB313 and S/2005
Why is the discovery of the moon important ?Why is the discovery of the moon important ?
MASS OF THE 10th PLANETMASS OF THE 10th PLANET
THE HISTORY OF THE SOLAR SYSTEMTHE HISTORY OF THE SOLAR SYSTEM