Astronomy:37 Fides
.png) A three-dimensional model of 37 Fides based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | R. Luther |
| Discovery date | October 5, 1855 |
| Designations | |
Designation | (37) Fides |
| Pronunciation | /ˈfaɪdiːz/[1] |
| Named after | Fides |
| 1925 WH | |
| Minor planet category | Main belt |
| Adjectives | Fidean /ˈfɪdiən/ |
| Orbital characteristics[2] | |
| Epoch February 25, 2023 (JD 2460000.5) | |
| Observation arc | 167 yr |
| |{{{apsis}}}|helion}} | 464.902 Gm (3.108 AU) |
| |{{{apsis}}}|helion}} | 325.937 Gm (2.179 AU) |
| 395.419 Gm (2.643 AU) | |
| Eccentricity | 0.176 |
| Orbital period | 1,569.628 d (4.30 a) |
| Mean anomaly | 303.436° |
| Mean motion | 0° 13m 45.84s / day |
| Inclination | 3.071° |
| Longitude of ascending node | 7.267° |
| 62.327° | |
| Physical characteristics | |
| Dimensions | 108.35 km ±1.9 |
| Mass | 1.3×1018 kg |
| Mean density | 2.0 g/cm3 |
| 0.0303 m/s2 | |
| 0.0573 km/s | |
| Rotation period | 0.3055 d (7.334 h)[3] |
| Albedo | 0.183[4] ±0.007 |
| Physics | ~167 K |
Spectral type | S |
| Absolute magnitude (H) | 7.29 |
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Fides /ˈfaɪdiːz/ (minor planet designation: 37 Fides) is a large main-belt asteroid. It was discovered by German astronomer Karl Theodor Robert Luther on October 5, 1855,[5] and named after Fides, the Roman goddess of loyalty. Fides was the last of the main-belt asteroids to be assigned an iconic symbol,[6] a Latin cross U+271D ✝ (.svg){kind=small}
).[7][8] 37 Fides is also a S-type asteroid in the Tholen classification system.[2]
Photometric observations of this asteroid at multiple observatories during 1981–82 gave an unusual light curve with three minima and maxima. The curve changed with varying phase angle of the asteroid relative to the viewer and the position of the Sun, indicating the changing influence of shadows cast by surface features. The composite light curve has a best fit period estimate of 7.33 hours.[9] Austrian astronomer Hans Josef Schober has suggested that the multiple minima and maxima during each period may be an indication of a binary nature.[10]
References
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 2.0 2.1 Jet Propulsion Laboratory, JPL Small-Body Database Browser: 37 Fides (A855 TB), NASA, https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=37, retrieved 29 June 2023.
- ↑ Asteroid Lightcurve Parameters, Planetary Science Institute, http://www.psi.edu/pds/archive/lc.html, retrieved 2008-11-03
- ↑ Asteroid Data Archive, Planetary Science Institute, http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab, retrieved 2008-11-03.
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html, retrieved 2013-04-07.
- ↑ Gould, B. A. (1852), "On the Symbolic Notation of the Asteroids", Astronomical Journal 2: 80, doi:10.1086/100212, Bibcode: 1852AJ......2...80G.
- ↑ Bala, Gavin Jared; Miller, Kirk (18 September 2023). "Unicode request for historical asteroid symbols". Unicode. https://www.unicode.org/L2/L2023/23207-historical-asteroids.pdf.
- ↑ Unicode. "Proposed New Characters: The Pipeline". The Unicode Consortium. https://unicode.org/alloc/Pipeline.html.
- ↑ Zappla, V. et al. (July 1983), "Remarkable modification of light curves for shadowing effects on irregular surfaces - The case of the asteroid 37 Fides", Astronomy and Astrophysics 123 (2): 326–330, Bibcode: 1983A&A...123..326Z.
- ↑ Schober, H. J. (February 1984), "A comparison between binary star light curves and those of possible binary asteroids", Astrophysics and Space Science 99 (1–2): 387–392, doi:10.1007/BF00650261, Bibcode: 1984Ap&SS..99..387S.
External links
- 37 Fides at AstDyS-2, Asteroids—Dynamic Site
- 37 Fides at the JPL Small-Body Database
vec:Lista de asteroidi#37 Fides
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