40 Harmonia

40 Harmonia
	A three-dimensional model of 40 Harmonia based on its light curve
Discovery
Discovered by	H. Goldschmidt
Discovery date	March 31, 1856
Designations
MPC designation	(40) Harmonia
Pronunciation	/hɑːrˈmoʊniə/
Named after	Harmonia
Alternative designations	1950 XU
Minor planet category	Main belt
Orbital characteristics
	Epoch December 31, 2006 (JD 2454100.5)
\|{{{apsis}}}\|helion}}	355.021 Gm (2.373 AU)
\|{{{apsis}}}\|helion}}	323.537 Gm (2.163 AU)
Semi-major axis	339.279 Gm (2.268 AU)
Eccentricity	0.046
Orbital period	1,247.514 d (3.42 a)
Mean anomaly	249.120°
Inclination	4.256°
Longitude of ascending node	94.287°
\|{{{apsis}}}\|helion}}	268.988°
Physical characteristics
Dimensions	107.6 km
Mass	~1.3×1018 kg
Rotation period	0.3712 d (8.909 h)
Geometric albedo	0.242
Spectral type	S
Apparent magnitude	9.31 (brightest)
Absolute magnitude (H)	7.0

Short description: Main-belt asteroid

Harmonia (minor planet designation: 40 Harmonia) is a large main-belt asteroid. It was discovered by German-French astronomer Hermann Goldschmidt on March 31, 1856,^[5] and named after Harmonia, the Greek goddess of harmony. The name was chosen to mark the end of the Crimean War.

The asteroid is orbiting the Sun with a period of 3.42 years and a relatively low eccentricity of 0.046. It has a cross-sectional size of 107.6 km. The spectrum of 40 Harmonia matches an S-type (silicate) in the Tholen classification system, and is similar to primitive achondrite meteorites.^[6] Photometric observations at the Organ Mesa Observatory in Las Cruces, New Mexico during 2008–09 were used to generate a light curve that showed four unequal minima and maxima per cycle. The curve shows a period of 8.909 ± 0.001 hours with a brightness variation of 0.28 ± 0.02 in magnitude. This result is compatible with previous studies.^[3]

Speckle interferometric observations carried out with the Nicholas U. Mayall Telescope at the Kitt Peak National Observatory during 1982–84 failed to discover a satellite companion.^[7] In 1988 a search for satellites or dust orbiting this asteroid was performed using the UH88 telescope at the Mauna Kea Observatories, but the effort came up empty.^[8]

References

↑ Noah Webster (1884) A Practical Dictionary of the English Language
↑ Yeomans, Donald K., "40 Harmonia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=40, retrieved 2013-04-07 .
↑ ^3.0 ^3.1 Pilcher, Frederick (October 2009), "New Lightcurves of 8 Flora, 13 Egeria, 14 Irene, 25 Phocaea 40 Harmonia, 74 Galatea, and 122 Gerda", The Minor Planet Bulletin 36 (4): pp. 133–136, Bibcode: 2009MPBu...36..133P .
↑ 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 .
↑ Hiroi, T. et al. (March 1993), "Modeling of S-type asteroid spectra using primitive achondrites and iron meteorites", Icarus 102 (1): pp. 107–116, doi:10.1006/icar.1993.1036, Bibcode: 1993Icar..102..107H .
↑ Roberts, Lewis C. Jr. et al. (November 1995), "A Speckle Interferometric Survey for Asteroid Duplicity", Astronomical Journal 110: pp. 2463–2468, doi:10.1086/117704, Bibcode: 1995AJ....110.2463R .
↑ Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results", Abstracts of the Lunar and Planetary Science Conference 19: pp. 405–406, Bibcode: 1988LPI....19..405G .

External links

40 Harmonia at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
40 Harmonia at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/40 Harmonia. Read more

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

[JPL-2] Yeomans, Donald K., "40 Harmonia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=40, retrieved 2013-04-07 .

[Pilcher2009-3] 3.0 ^3.1 Pilcher, Frederick (October 2009), "New Lightcurves of 8 Flora, 13 Egeria, 14 Irene, 25 Phocaea 40 Harmonia, 74 Galatea, and 122 Gerda", The Minor Planet Bulletin 36 (4): pp. 133–136, Bibcode: 2009MPBu...36..133P .

[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 .

[Hiroi1993-6] Hiroi, T. et al. (March 1993), "Modeling of S-type asteroid spectra using primitive achondrites and iron meteorites", Icarus 102 (1): pp. 107–116, doi:10.1006/icar.1993.1036, Bibcode: 1993Icar..102..107H .

[Roberts1995-7] Roberts, Lewis C. Jr. et al. (November 1995), "A Speckle Interferometric Survey for Asteroid Duplicity", Astronomical Journal 110: pp. 2463–2468, doi:10.1086/117704, Bibcode: 1995AJ....110.2463R .

[Gradie1988-8] Gradie, J.; Flynn, L. (March 1988), "A Search for Satellites and Dust Belts Around Asteroids: Negative Results", Abstracts of the Lunar and Planetary Science Conference 19: pp. 405–406, Bibcode: 1988LPI....19..405G .