228 Agathe

228 Agathe
Discovery
Discovered by	J. Palisa
Discovery site	Vienna Observatory
Discovery date	19 August 1882
Designations
MPC designation	(228) Agathe
Named after	daughter of astronomer; Theodor v. Oppolzer
Minor planet category	main-belt
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	110.45 yr (40343 d)
Aphelion	2.7345 AU (409.08 Gm)
Perihelion	1.6680 AU (249.53 Gm)
Semi-major axis	2.2013 AU (329.31 Gm)
Eccentricity	0.24224
Orbital period (sidereal)	3.27 yr (1192.9 d)
Mean anomaly	359.08°
Mean motion	0° 18m 6.408s / day
Inclination	2.5363°
Longitude of ascending node	313.36°
Argument of perihelion	19.121°
Earth MOID	0.657123 AU (98.3042 Gm)
Mars MOID	0.2931 AU (43.85 Gm)
Jupiter MOID	2.62486 AU (392.673 Gm)
TJupiter	3.625
Physical characteristics
Dimensions	9.30±0.8 km
Synodic rotation period	6.484 h (0.2702 d)
Geometric albedo	0.2082±0.043
Spectral type	B–V = 0.918; U–B = 0.596; S (Tholen), S (SMASS)
Absolute magnitude (H)	12.48

Agathe (minor planet designation: 228 Agathe) is a stony main belt asteroid, about 9 kilometers in diameter. It was discovered by Johann Palisa on 19 August 1882 at Vienna Observatory, Austria. Photometric observations during 2003 showed a rotation period of 6.48 ± 0.01 hours with a brightness variation of 0.27 ± 0.03 in magnitude. An earlier study yielded results that are consistent with these estimates.^[3] Agathe is the lowest numbered asteroid to have an Earth-MOID as low as 0.657 AU (98.3 million km).^[1] On 23 August 2029 the asteroid will be 0.659 AU (98.6 million km) from Earth.

Agathe was named after the youngest daughter of Austrian astronomer Theodor von Oppolzer (1841–1886), professor of astronomy in Vienna.^[2]

References[]

^ ^a ^b ^c "JPL Small-Body Database Browser: 228 Agathe" (2015-06-18 last obs.). Jet Propulsion Laboratory. Retrieved 12 May 2016.
^ ^a ^b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (228) Agathe. Springer Berlin Heidelberg. p. 35. doi:10.1007/978-3-540-29925-7_229. ISBN 978-3-540-29925-7.
^ Cooney, Walter R., Jr. (March 2005), "Lightcurve results for minor planets 228 Agathe, 297 Caecilia, 744 Aguntina 1062 Ljuba, 1605 Milankovitch, and 3125 Hay", The Minor Planet Bulletin, 32 (1): 15–16, Bibcode:2005MPBu...32...15C.

External links[]

Dictionary of Minor Planet Names, Google books
The Asteroid Orbital Elements Database
Minor Planet Discovery Circumstances
228 Agathe at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
228 Agathe at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[jpldata-1] "JPL Small-Body Database Browser: 228 Agathe" (2015-06-18 last obs.). Jet Propulsion Laboratory. Retrieved 12 May 2016.

[springer-2] Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (228) Agathe. Springer Berlin Heidelberg. p. 35. doi:10.1007/978-3-540-29925-7_229. ISBN 978-3-540-29925-7.

[bmps32_1_15-3] Cooney, Walter R., Jr. (March 2005), "Lightcurve results for minor planets 228 Agathe, 297 Caecilia, 744 Aguntina 1062 Ljuba, 1605 Milankovitch, and 3125 Hay", The Minor Planet Bulletin, 32 (1): 15–16, Bibcode:2005MPBu...32...15C.

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