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19 Fortuna
Main-belt asteroid
Main-belt asteroid
| Field | Value | ||
|---|---|---|---|
| minorplanet | yes | ||
| background | #D6D6D6 | ||
| name | 19 Fortuna | ||
| symbol | [[File:Fortuna symbol (bold).svg | 24px | class=skin-invert]] (historical) |
| image | 19 Fortuna VLT (2021), deconvolved.pdf | ||
| discoverer | John Russell Hind | ||
| discovered | 22 August 1852 | ||
| mpc_name | (19) Fortuna | ||
| alt_names | A902 UG | ||
| pronounced | |||
| adjective | Fortunian | ||
| named_after | Fortūna | ||
| mp_category | Main belt | ||
| orbit_ref | {{cite web | ||
| type | 2024-11-14 last obs | ||
| title | JPL Small-Body Database Browser: 19 Fortuna | ||
| url | http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=19 | ||
| accessdate | 2024-12-21}} | ||
| epoch | 17.0 October 2024 (JD 2460600.5) | ||
| semimajor | 2.441 AU (365.235 million km) | ||
| perihelion | 2.052 AU (307.028 million km) | ||
| aphelion | 2.831 AU (423.443 million km) | ||
| eccentricity | 0.159 | ||
| period | 3.81 a (1393.378 d) | ||
| inclination | 1.573° | ||
| asc_node | 211.379° | ||
| arg_peri | 182.091° | ||
| moid | 1.06316 AU | ||
| jupiter_moid | 2.60305 AU | ||
| mean_anomaly | 268.398° | ||
| avg_speed | 18.94 km/s | ||
| tisserand | 3.483 | ||
| dimensions | (225 × 205 × 195) ± 12 km | ||
| (242 × 203 × 192) ± 10 km | |||
| mean_diameter | |||
| 225 km{{cite journal | |||
| last | Storrs | ||
| first | Alex | ||
| author2 | Weiss, B. | ||
| author3 | Zellner, B. | ||
| title | Imaging Observations of Asteroids with Hubble Space Telescope | ||
| journal | Icarus | ||
| volume | 137 | ||
| pages | 260–268 | ||
| date | 1998 | ||
| url | http://scripts.mit.edu/~paleomag/articles/Storrs_1999_Icarus.pdf | ||
| accessdate | 2005-01-15 | ||
| doi | 10.1006/icar.1999.6047 | ||
| bibcode | 1999Icar..137..260S | ||
| issue | 2 | ||
| display-authors | etal | ||
| url-status | dead | ||
| archiveurl | https://web.archive.org/web/20120225134811/http://scripts.mit.edu/~paleomag/articles/Storrs_1999_Icarus.pdf | ||
| archivedate | 25 February 2012 | ||
| df | mdy-all | ||
| }}</ref><ref name | "Baer2007"/ | ||
| flattening | 0.21 | ||
| mass | |||
| 12.7 kg{{cite web | |||
| date | 2008 | ||
| title | Recent Asteroid Mass Determinations | ||
| publisher | Personal Website | ||
| author | Jim Baer | ||
| url | http://home.earthlink.net/~jimbaer1/astmass.txt | ||
| accessdate | 2008-11-27 | ||
| archive-url | https://web.archive.org/web/20131021074442/http://home.earthlink.net/~jimbaer1/astmass.txt | ||
| archive-date | 21 October 2013 | ||
| url-status | dead | ||
| density | |||
| surface_grav | ~0.0629 m/s² | ||
| escape_velocity | ~0.1190 km/s | ||
| rotation | 7.4432 h (0.3101 d) | ||
| axial_tilt | 29° | ||
| spectral_type | G | ||
| magnitude | 8.88 to 12.95 | ||
| abs_magnitude | 7.49 | ||
| 7.13 | |||
| pole_ecliptic_lat | |||
| pole_ecliptic_lon | |||
| albedo | 0.056 | ||
| 0.037 | |||
| angular_size | 0.25" to 0.072" | ||
| single_temperature | ~180 K |
(242 × 203 × 192) ± 10 km 225 km{{cite journal |display-authors = etal |url-status = dead 12.7 kg{{cite web |archive-url=https://web.archive.org/web/20131021074442/http://home.earthlink.net/~jimbaer1/astmass.txt |archive-date=21 October 2013 |url-status=dead
7.13 0.037
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.
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.{{cite journal | display-authors=1 | postscript=.
Discovery and naming
It was discovered by J. R. Hind on 22 August 1852, and named after Fortuna, the Roman goddess of luck. Its historical symbol was a star over Fortune's wheel; it was encoded in Unicode 17.0 as U+1CECC ([[File:Fortuna symbol (fixed width).svg|12px|class=skin-invert]]).{{cite web | access-date = September 9, 2025 | url-status = live
Physical characteristics
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.{{cite web
Fortuna has been perturbed by the 80 km 135 Hertha and was initially estimated by Baer to have a mass of 1.08 kg.{{cite journal |author2-link=Steven R. Chesley
On 21 December 2012, Fortuna (~200 km) harmlessly passed within 6.5 million km of asteroid 687 Tinette.
Notes
References
References
- Noah Webster (1884) ''A Practical Dictionary of the English Language''
- P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. ''Astronomy & Astrophysics'' 54, A56
- "AstDys (19) Fortuna Ephemerides". Department of Mathematics, University of Pisa, Italy.
- (18 September 2023). "Unicode request for historical asteroid symbols". Unicode.
- Generated with [http://chemistry.unina.it/~alvitagl/solex/ Solex 10] {{webarchive. link. (20 December 2008 by Aldo Vitagliano)
This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.
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