674 Rachele

674 Rachele
Discovery
Discovered by	Wilhelm Lorenz
Discovery site	Heidelberg
Discovery date	28 October 1908
Designations
MPC designation	(674) Rachele
Pronunciation	Italian: [raˈkɛːle][1]
Alternative designations	1908 EP
Orbital characteristics[2]
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	114.81 yr (41936 d)
Aphelion	3.4928 AU (522.52 Gm)
Perihelion	2.3488 AU (351.38 Gm)
Semi-major axis	2.9208 AU (436.95 Gm)
Eccentricity	0.19584
Orbital period	4.99 yr (1823.3 d)
Mean anomaly	147.48°
Mean motion	0° 11m 50.82s / day
Inclination	13.511°
Longitude of ascending node	58.146°
Argument of perihelion	42.025°
Physical characteristics
Mean radius	48.675±2.15 km
Rotation period	30.982 h (1.2909 d)
Geometric albedo	0.2007±0.019
Absolute magnitude (H)	7.42

674 Rachele is a minor planet orbiting the Sun. It was discovered by Wilhelm Lorenz on 28 October 1908 in Heidelberg, and was named by orbit computer Emilio Bianchi after his wife.[3] This is classified as an S-type asteroid,[4] indicating a stony composition.

Measurements made using the adaptive optics system at the W. M. Keck Observatory give a size estimate of 89 km. It has a size ratio of 1.08 between the major and minor axes. By comparison, measurements reported in 1998 from the IRAS observatory give a similar size of 97 km and a ratio of 1.15.[5]

References

(DOP)
"674 Rachele (1908 EP)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.
Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (6th ed.), Springer, p. 65, ISBN 978-3642297182.
Piironen, J.; et al. (March 1998), "Physical studies of asteroids. XXXII. Rotation periods and UBVRI-colours for selected asteroids", Astronomy and Astrophysics Supplement, 128 (3): 525–540, Bibcode:1998A&AS..128..525P, doi:10.1051/aas:1998393.
Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, 185 (1): 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.

External links

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

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[1] (DOP)

[jpldata-2] "674 Rachele (1908 EP)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 7 May 2016.

[Schmadel2012-3] Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (6th ed.), Springer, p. 65, ISBN 978-3642297182.

[aas128_525-4] Piironen, J.; et al. (March 1998), "Physical studies of asteroids. XXXII. Rotation periods and UBVRI-colours for selected asteroids", Astronomy and Astrophysics Supplement, 128 (3): 525–540, Bibcode:1998A&AS..128..525P, doi:10.1051/aas:1998393.

[Marchis2006-5] Marchis, F.; et al. (November 2006), "Shape, size and multiplicity of main-belt asteroids. I. Keck Adaptive Optics survey", Icarus, 185 (1): 39–63, Bibcode:2006Icar..185...39M, doi:10.1016/j.icarus.2006.06.001, PMC 2600456, PMID 19081813.