37 Fides

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] 37 Fides is also a S-type asteroid in the Tholen classification system.[2]

37 Fides
A three-dimensional model of 37 Fides based on its light curve
Discovery
Discovered byR. Luther
Discovery dateOctober 5, 1855
Designations
Designation
(37) Fides
Pronunciation/ˈfaɪdiːz/[1]
Named after
Fides
1925 WH
Main belt
AdjectivesFidean /ˈfɪdiən/
Symbol (historical)
Orbital characteristics[2]
Epoch February 25, 2023 (JD 2460000.5)
Observation arc167 yr
Aphelion464.902 Gm (3.108 AU)
Perihelion325.937 Gm (2.179 AU)
395.419 Gm (2.643 AU)
Eccentricity0.176
1,569.628 d (4.30 a)
303.436°
0° 13m 45.84s / day
Inclination3.071°
7.267°
62.327°
Physical characteristics
Dimensions108.35 km ±1.9
Mass1.3×1018 kg
Mean density
2.0 g/cm3
0.0303 m/s2
0.0573 km/s
0.3055 d (7.334 h)[3]
Albedo0.183[4] ±0.007
Temperature~167 K
Spectral type
S
7.29

    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.[7] Austrian astronomer Hans Josef Schober has suggested that the multiple minima and maxima during each period may be an indication of a binary nature.[8]

    References
    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. Jet Propulsion Laboratory, JPL Small-Body Database Browser: 37 Fides (A855 TB), NASA, retrieved 29 June 2023.
    3. Asteroid Lightcurve Parameters, Planetary Science Institute, archived from the original on 14 June 2006, retrieved 3 November 2008
    4. Asteroid Data Archive, Planetary Science Institute, archived from the original on 23 May 2006, retrieved 3 November 2008.
    5. "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
    6. Gould, B. A. (1852), "On the Symbolic Notation of the Asteroids", Astronomical Journal, 2: 80, Bibcode:1852AJ......2...80G, doi:10.1086/100212.
    7. 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.
    8. 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, Bibcode:1984Ap&SS..99..387S, doi:10.1007/BF00650261, S2CID 189850465.

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