 Orbital diagram | |
| 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 |
| Alternative designations | A882 QA |
| Minor planet category | main-belt |
| Orbital characteristics | |
| 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) |
| Semi-major axis | 2.20 AU (329 million km) |
| Eccentricity | 0.24227 |
| Orbital period (sidereal) | 3.27 yr (1193.1 d) |
| Mean anomaly | 63.67° |
| Mean motion | 0° 18 6.408 / day |
| Inclination | 2.5359° |
| Longitude of ascending node | 313.25° |
| Argument of perihelion | 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 |
| 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) | 12.32 |
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.
| 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.
References
- ^ "JPL Small-Body Database Browser: 228 Agathe" (2023-08-05 last obs.). Jet Propulsion Laboratory. Retrieved 20 September 2023.
- ^ 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.
- "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.
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
- 228 Agathe at the JPL Small-Body Database
| Minor planets navigator | |
|---|---|
| Small Solar System bodies | |||||||
|---|---|---|---|---|---|---|---|
| Minor planets |
| ||||||
| Comets | |||||||
| Other | |||||||
_mathilde.jpg){kind=small} | This article about an asteroid native to the asteroid belt is a stub. You can help Misplaced Pages by expanding it. |