| flattening = 0.41

| abs_magnitude=6.81 and silicates, which indicate rather a stony surface composition. Kalliope also has a low radar albedo,

Satellite

Kalliope has one known natural satellite, designated (22) Kalliope I and named Linus. It is quite large about 28 km in diameter and would be a sizeable asteroid by itself. It orbits about 1100 km from the center of Kalliope, equivalent to about 13.2 Kalliope radii. Linus was discovered on 29 August 2001 by Jean-Luc Margot and Michael E. Brown, while another team led by William Merline also independently detected the moon 3 days later.

First stellar occultation

On 7 November 2006, the first stellar occultation by the satellite of an asteroid (Linus) was successfully observed by a group of Japanese observers according to a prediction that was made just one day before by Berthier et al. based on more than 5 years of regular observations of Kalliope binary system using adaptive optics systems on ground-based telescopes. The observed chords of Linus gave a unique opportunity to estimate the size of the moonlet which was estimated to 20–28 km.

Notes

References

  • , Palmer Divide Observatory, B. D. Warner (2007)
  • orbit diagram for Linus
  • A different VLT image of Kalliope and Linus
  • (22) Kalliope, datasheet, johnstonsarchive.net
  • Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
  • [https://web.archive.org/web/20080609042022/http://www.imcce.fr/page.php?nav=en%2Fephemerides%2Fphenomenes%2Foccult%2Fstellarocc.php%3Fquery%3Dpredoc], Prediction and Reduction of Stellar Occultations of Binary Asteroids