228 Agathe
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.
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| Column 1 |
|---|
| Orbital diagram |
| J. Palisa |
| Vienna Observatory |
| 19 August 1882 |
| (228) Agathe |
| daughter of astronomerTheodor v. Oppolzer |
| A882 QA |
| main-belt |
| Epoch 13 September 2023(JD 2453300.5) |
| Uncertainty parameter 0 |
| 130.80 yr |
| 2.73 AU (408 million km) |
| 1.67 AU (250 million km) |
| 2.20 AU (329 million km) |
| 0.24227 |
| 3.27 yr (1193.1 d) |
| 63.67° |
| 0° 18m 6.408s / day |
| 2.5359° |
| 313.25° |
| 19.177° |
| 0.657 AU (98.3 million km) |
| 0.29 AU (43 million km) |
| 2.63 AU (393 million km) |
| 3.624 |
| 9.30±0.8 km |
| 6.484 h (0.2702 d) |
| 0.2082±0.043 |
| B–V = 0.918U–B = 0.596S (Tholen), S (SMASS) |
| 12.32 |
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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.
| Date and time ofclosest approach | Earth distance(AU) | Sun distance(AU) | Velocityrelative to Earth(km/s) | Velocityrelative to Sun(km/s) | Uncertaintyregion(3-sigma) | Solarelongation |
|---|---|---|---|---|---|---|
| 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.
- 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
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