228 Agathe

228 Agathe
Orbital diagram
Discovery
Discovered byJ. Palisa
Discovery siteVienna Observatory
Discovery date19 August 1882
Designations
(228) Agathe
Named after
daughter of astronomer
Theodor v. Oppolzer
A882 QA
main-belt
Orbital characteristics
Epoch 13 September 2023
(JD 2453300.5)
Uncertainty parameter 0
Observation arc130.80 yr
Aphelion2.73 AU (408 million km)
Perihelion1.67 AU (250 million km)
2.20 AU (329 million km)
Eccentricity0.24227
3.27 yr (1193.1 d)
63.67°
0° 18m 6.408s / day
Inclination2.5359°
313.25°
19.177°
Earth MOID0.657 AU (98.3 million km)
Mars MOID0.29 AU (43 million km)
Jupiter MOID2.63 AU (393 million km)
TJupiter3.624
Physical characteristics
Dimensions9.30±0.8 km
6.484 h (0.2702 d)
0.2082±0.043
B–V = 0.918
U–B = 0.596
S (Tholen), S (SMASS)
12.32

    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. Agathe is the lowest numbered asteroid to have an Earth-MOID as low as 0.657 AU (98.3 million km). On 23 August 2029 the asteroid will be 0.659 AU (98.6 million km) from Earth.

    228 Agathe Earth approach on 23 August 2029
    Date and time of
    closest approach    		 Earth distance
    (AU)    		 Sun distance
    (AU)    		 Velocity
    relative to Earth
    (km/s)    		 Velocity
    relative to Sun
    (km/s)    		 Uncertainty
    region
    (3-sigma)    		 Solar
    elongation
    23 August 2029 ≈07:220.6597 AU (98.69 million km; 61.32 million mi; 256.7 LD)1.67 AU (250 million km; 155 million mi)3.925.7± 1.4 km177.9°

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

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