19 Fortuna

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19 Fortuna
Synodic rotation period
0.3101 d (7.4432 h)[2]
0.056[4] 0.037[2]
Temperature~180 K
G[2]
8.88[7] to 12.95
7.13[2]
0.25" to 0.072"

Fortuna (

1 Ceres: a darkly colored surface that is heavily space-weathered with the composition of primitive organic compounds, including tholins
.

Fortuna is 225 km in diameter and has one of the darkest known geometric albedos for an asteroid over 150 km in diameter. Its albedo has been measured at 0.028 and 0.037.[8] The spectra of the asteroid displays evidence of aqueous alteration.[9]

The

arcseconds (4.5 pixels in the Planetary Camera) and its shape was found to be nearly spherical. Satellites
were searched for but none were detected.

Stellar occultations by Fortuna have been observed several times. Fortuna has been studied by radar.[10]

It was discovered by

Fortuna, the Roman goddess of luck. Its historical symbol was a star over Fortune's wheel; it is in the pipeline for Unicode 17.0 as U+1CECC 𜻌 ().[11][12]

Fortuna has been perturbed by the 80 km 135 Hertha and was initially estimated by Baer to have a mass of 1.08×1019 kg.[6] A more recent estimate by Baer suggests it has a mass of 1.27×1019 kg.[3]

On December 21, 2012, Fortuna (~200 km) harmlessly passed within 6.5 Gm of asteroid 687 Tinette.[13]

Notes

  1. ^ Flattening derived from the maximum aspect ratio (c/a): , where (c/a) = 0.79±0.05.[4]

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d e "JPL Small-Body Database Browser: 19 Fortuna" (2008-08-21 last obs). Retrieved November 11, 2008.
  3. ^ a b c d Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on October 21, 2013. Retrieved November 27, 2008.
  4. ^ a b c d e P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
  5. doi:10.1006/icar.1999.6047. Archived from the original
    (PDF) on February 25, 2012. Retrieved January 15, 2005.
  6. ^
    doi:10.1007/s10569-007-9103-8
    .
  7. ^ "AstDys (19) Fortuna Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved June 27, 2010.
  8. doi:10.1016/j.icarus.2004.08.007. Archived from the original
    (PDF) on April 18, 2007. Retrieved September 23, 2007.
  9. doi:10.1051/aas:1999161
    .
  10. ^ "Radar-Detected Asteroids and Comets". NASA/JPL Asteroid Radar Research. Retrieved October 30, 2011.
  11. ^ Bala, Gavin Jared; Miller, Kirk (September 18, 2023). "Unicode request for historical asteroid symbols" (PDF). unicode.org. Unicode. Retrieved September 26, 2023.
  12. ^ Unicode. "Proposed New Characters: The Pipeline". unicode.org. The Unicode Consortium. Retrieved November 6, 2023.
  13. ^ Generated with Solex 10 Archived December 20, 2008, at the Wayback Machine by Aldo Vitagliano

External links

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