(208996) 2003 AZ 84 1

from Wikipedia, the free encyclopedia
(208996) 2003 AZ84 1
Central body (208996) 2003 AZ 84
Properties of the orbit
Major semi-axis 7200 ± 300 km
Periapsis unknown
Apoapsis unknown
Orbital time 12 d
Mean orbital velocity 0.043 km / s
Physical Properties
Albedo 0.097 ± 0.009
Apparent brightness 25.3 mag
Medium diameter km
Date of discovery December 2, 2005

(208996) 2003 AZ 84 1 is a moon of the trans-Neptunian object (208996) 2003 AZ 84 , which is classified as Plutino in terms of orbital dynamics . The companion is about a tenth the diameter of the mother planetoid. So far, however, the moon has not been found again.

Discovery and naming

(208996) 2003 AZ 84 1 was discovered on December 2, 2005 by Michael E. Brown and Terry – Ann Suer on images from 2003 AZ 84 , which were made with the Hubble space telescope. The discovery was announced on February 22, 2007, the moon was given the provisional designation (208996) 2003 AZ 84 1 .

The companion was found at 0.22 arc seconds from 2003 AZ 84 , with an apparent magnitude difference of 5.0.

Track properties

(208996) 2003 AZ 84 1 orbits 2003 AZ 84 in an elliptical orbit at an average distance of 7200 km to the planetoid, that is 18.7 2003 AZ 84 radii and 187 (208996) 2003 AZ 84 1 radii. It takes 12 days for one cycle, which corresponds to 7516.8 cycles in a 2003 AZ 84 year. The orbital eccentricity and inclination are currently unknown.

In this binary system, a month accordingly lasts 21.46 2003 AZ 84 days .

Physical Properties

The discoverers put the size of the moon at 10% of the mother planetoid; the diameter of (208996) 2003 AZ 84 1 is therefore currently calculated to be 77 km, based on the most recent value of the diameter determination of 2003 AZ 84 of 772 km, which is based on a reflectivity of 9.7%. The apparent magnitude of (208996) 2003 AZ 84 1 is 25.3  m .

Since the moon could not be found again until 2012, the mass of the system has not yet been calculated.

Determination of the diameter for S / 2005 (208996) 1
year Dimensions km source
2014 72.0 ± 12.0 Johnston
2019 77.0 ± 12.0 calculation
The most precise determination is marked in bold .

See also

Individual evidence

  1. a b Michael E. Brown , Terry – Ann Suer: Satellites of 2003 AZ_84, (50000), (55637), and (90482) . In: IAUC . 8812, No. 1, February 2007. bibcode : 2007IAUC.8812 .... 1B .
  2. v ≈ π * a / period (1 + sqrt (1-e²))
  3. ^ W. Grundy: 208996 (2003 AZ84) . Lowell Observatory . September 14, 2014. Retrieved February 9, 2019.
  4. Marc W. Buie : Orbit Fit and Astrometric record for 208996. SwRI (Space Science Department), accessed on February 9, 2019 .
  5. Brian G. Marsden: MPEC 2009-R09: Distant Minor Planets (2009 SEPT 16.0 TT.) . In: IAU Minor Planet Center . September 16, 2009. Retrieved February 9, 2019.
  6. ^ A b Wm. R. Johnston: (208996) 2003 AZ84 . Johnston's Archives. September 20, 2014. Accessed February 9, 2019.
  7. Michael E. Brown : After a bit more than 3 hrs on 2003AZ84 still no obvious moon (February 3, 2012). Twitter, accessed February 9, 2019 .