S / 2003 (283) 1

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(283) Emma I (S / 2002 (121) 1) 1)
Provisional or systematic name S / 2003 (283) 1
Central body (283) Emma
Properties of the orbit
Major semi-axis 581 ± 3.6 km
Periapsis 511 km
Apoapsis 651 km
eccentricity 0.12 ± 0.01
Orbit inclination 94.2 ± 0.4 °
Orbital time 3.353 ± 0.00093 d
Physical Properties
Albedo ≈ 0.032 ± 0.004
Medium diameter 9.0 ± 5.0 km
surface 255 km 2
Surface temperature 184 K
discovery
Explorer
  • William J. Merline
  • Christophe Dumas
  • N. Siegler
  • Laird M. Close
  • Clark R. Chapman
  • Peter M. Tamblyn
  • D. Terrell
  • A. R. Conrad
  • François Menard
  • Gilles Duvert
Date of discovery July 14, 2003
Remarks Largest moon in the asteroid belt

S / 2003 (283) 1 is a moon of the main belt asteroid (283) Emma . Its mean diameter is 9 kilometers.

Discovery and naming

S / 2003 (283) 1 was published on July 14, 2003 by William J. Merline, Christophe Dumas, Laird M. Close, Clark R. Chapman, Peter M. Tamblyn, D. Terrell, AR Conrad, François Menard and Gilles Duvert Use of adaptive optics discovered with the 10 m Keck Telescope II on Mauna Kea in Hawaii . The discovery was announced on July 27, 2003; the moon was given the provisional designation S / 2003 (283) 1 . An official naming by the IAU is still pending.

Track properties

S / 2003 (283) 1 orbits Emma on a retrograde , slightly elliptical orbit at an average distance of 581 kilometers from the center (about 4.4 Emma radii). The orbital eccentricity is 0.12, the orbit is 94.2 ° inclined to the equator of Emma .

S / 2003 (283) 1 orbits Emma in 3 days, 8 hours and 28 minutes, which corresponds to about 581 orbits in an Emma year (around 5.3 earth years). The orbit of S / 2003 (283) 1 is assumed to be stable because it is well within Emma's Hill radius of 24,000 km, but also well outside of the synchronous orbit.

Physical Properties

size

According to current data, S / 2003 (283) 1 has a diameter of 9 km (almost 1/15 of the central body), based on Emma's density and the corresponding assumed equal reflectivity of only 3.2%. The surface is therefore extremely dark. On the basis of the data so far, however, the determination of the diameter still seems relatively uncertain; it currently ranges from 4 to 14 km.

Assuming a mean diameter of 9 km, the surface area is around 254.5 km 2 , which is slightly larger than the area of ​​the Swiss canton of Appenzell Ausserrhoden .

Determination of the diameter for S / 2003 (283) 1

year Dimensions km source
2003 12.0 IAU
2008 9.0 ± 5.0 Marchis et al.
2016 10.0 Vachier et al.

The most precise determination is marked in bold .

internal structure

Since S / 2003 (283) 1 has a similar color to the mother body, it is assumed that the moon is made of the same material as Emma and therefore has the same spectral type (X or P).

The mean surface temperature is 184  K (−89 ° C).

See also

Web links

Individual evidence

  1. ^ A b Daniel WE Green: IAUC No. 8165: S / 2003 (283) 1 discovery publication (July 2003). Retrieved September 12, 2017 .
  2. ^ Franck Marchis et al .: Main belt binary asteroidal systems with eccentric mutual orbits (May 2008) (PDF). Retrieved September 12, 2017 .
  3. Frédéric Vachier: Sunday 20th of November 2016 ~ 18:40:12 UTC (283) Emma occult 4U 455-51223 (mag 8.7) (November 2016). Retrieved September 12, 2017 .