37 Fides

37 Fides (historical)
	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/
Named after	Fides
Alternative names	1925 WH
Minor planet category	Main belt
Adjectives	Fidean /ˈfɪdiən/
Orbital characteristics
	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)
Semi-major axis	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°
\|{{{apsis}}}\|helion}}	62.327°
Physical characteristics
Dimensions	108.35 km ±1.9
Mass	1.3×1018 kg
Mean density	2.0 g/cm3
surface gravity	0.0303 m/s2
escape velocity	0.0573 km/s
Rotation period	0.3055 d (7.334 h)
Albedo	0.183 ±0.007
Physics	~167 K
Spectral type	S
Absolute magnitude (H)	7.29

Short description: Main-belt asteroid

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 ✝ ().^[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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
37 Fides at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

vec:Lista de asteroidi#37 Fides

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[1] Noah Webster (1884) A Practical Dictionary of the English Language

[JPL-2] 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.

[ALP-3] Asteroid Lightcurve Parameters, Planetary Science Institute, http://www.psi.edu/pds/archive/lc.html, retrieved 2008-11-03

[ADA-4] Asteroid Data Archive, Planetary Science Institute, http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab, retrieved 2008-11-03.

[IAU_MPC-5] "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html, retrieved 2013-04-07.

[Gould1852-6] Gould, B. A. (1852), "On the Symbolic Notation of the Asteroids", Astronomical Journal 2: 80, doi:10.1086/100212, Bibcode: 1852AJ......2...80G.

[astunicode-7] 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.

[pipeline-8] Unicode. "Proposed New Characters: The Pipeline". The Unicode Consortium. https://unicode.org/alloc/Pipeline.html.

[Zappla1983-9] 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.

[Schober1984-10] 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.