Back 228 Agathe (كويكب) ARZ 228 Agathe AST (228) Agathe Catalan (228) Агата CE (228) Agathe German 228 Αγάθη Greek 228 Agathe Esperanto (228) Agathe Spanish 228 Agathe Basque آگاته ۲۲۸ Persian
 Orbital diagram | |
| Discovery [1] | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Vienna Observatory |
| Discovery date | 19 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 arc | 130.80 yr |
| Aphelion | 2.73 AU (408 million km) |
| Perihelion | 1.67 AU (250 million km) |
| 2.20 AU (329 million km) | |
| Eccentricity | 0.24227 |
| 3.27 yr (1193.1 d) | |
| 63.67° | |
| 0° 18m 6.408s / day | |
| Inclination | 2.5359° |
| 313.25° | |
| 19.177° | |
| Earth MOID | 0.657 AU (98.3 million km) |
| Mars MOID | 0.29 AU (43 million km) |
| Jupiter MOID | 2.63 AU (393 million km) |
| TJupiter | 3.624 |
| Physical characteristics | |
| Dimensions | 9.30±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.
| 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]
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