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228 Agathe

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228 Agathe
Orbital diagram
Discovery [1]
Discovered byJ. Palisa
Discovery siteVienna Observatory
Discovery date19 August 1882
Designations
(228) Agathe
Named after
daughter of astronomer
Theodor v. Oppolzer[2]
A882 QA
main-belt
Orbital characteristics[1]
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.[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.

228 Agathe Earth approach on 23 August 2029[4]
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 ≈07:22 0.6597 AU (98.69 million km; 61.32 million mi; 256.7 LD) 1.67 AU (250 million km; 155 million mi) 3.9 25.7 ± 1.4 km 177.9°

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

References

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  1. ^ a b c "JPL Small-Body Database Browser: 228 Agathe" (2023-08-05 last obs.). Jet Propulsion Laboratory. Retrieved 20 September 2023.
  2. ^ 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.
  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.
  4. ^ "Horizons Batch for 228 Agathe on 2029-Aug-23" (Closest Earth approach occurs when deldot flips from negative to positive). JPL Horizons. Retrieved 20 September 2023.
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