Astronomy:228 Agathe
 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 | |
| Minor planet category | main-belt |
| Orbital characteristics [1] | |
| Epoch 13 September 2023 (JD 2453300.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 130.80 yr |
| |{{{apsis}}}|helion}} | 2.73 astronomical unit|AU (408 million km) |
| |{{{apsis}}}|helion}} | 1.67 AU (250 million km) |
| 2.20 AU (329 million km) | |
| Eccentricity | 0.24227 |
| Orbital period | 3.27 yr (1193.1 d) |
| Mean anomaly | 63.67° |
| Mean motion | 0° 18m 6.408s / day |
| Inclination | 2.5359° |
| Longitude of ascending node | 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 |
| Rotation period | 6.484 h (0.2702 d) |
| Geometric albedo | 0.2082±0.043 |
| B–V = 0.918 U–B = 0.596 S (Tholen), S (SMASS) | |
| Absolute magnitude (H) | 12.32 |
Agathe (minor planet designation: 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 astronomical unit|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 astronomical unit|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
- ↑ 1.0 1.1 1.2 "JPL Small-Body Database Browser: 228 Agathe". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000228.
- ↑ 2.0 2.1 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". JPL Horizons. https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27228%27&START_TIME=%272029-Aug-23%2007:00%27&STOP_TIME=%272029-Aug-23%2008:00%27&STEP_SIZE=%2760%27&QUANTITIES=%2719,20,22,23,39%27.
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
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