19 Fortuna

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19 Fortuna
19 Fortuna VLT (2021), deconvolved.pdf
Discovery
Discovered by John Russell Hind
Discovery dateAugust 22, 1852
Designations
(19) Fortuna
Pronunciation /fɔːrˈtjnə/ [1]
Named after
Fortūna
A902 UG
Main belt
Adjectives Fortunian /fɔːrˈtjniən/
Symbol Fortuna symbol (bold).svg (historical)
Orbital characteristics [2]
Epoch October 22, 2004 (JD 2453300.5)
Aphelion 2.831 AU (423.443 Gm)
Perihelion 2.052 AU (307.028 Gm)
2.441 AU (365.235 Gm)
Eccentricity 0.159
3.81 a (1393.378 d)
Average orbital speed
18.94 km/s
268.398°
Inclination 1.573°
211.379°
182.091°
Physical characteristics
Dimensions(225×205×195)±12 km [3]
211±2 km [4]
225 km [5] [6]
Flattening 0.21 [lower-alpha 1]
Mass (8.8±1.4)×1018 kg [4]
12.7×1018 kg [3]
Mean density
1.80±0.29 g/cm3 [4]
2.70±0.48 g/cm3 [3]
Equatorial surface gravity
~0.0629 m/s²
Equatorial escape velocity
~0.1190 km/s
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"

    19 Fortuna is one of the largest main-belt asteroids. It has a composition similar to 1 Ceres: a darkly colored surface that is heavily space-weathered with the composition of primitive organic compounds, including tholins.

    Contents

    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 Hubble Space Telescope observed Fortuna in 1993. It was resolved with an apparent diameter of 0.20 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 J. R. Hind on August 22, 1852, and named after 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 𜻌 ( Fortuna symbol (fixed width).svg ). [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]

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    References

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    13. Generated with Solex 10 Archived December 20, 2008, at the Wayback Machine by Aldo Vitagliano